edwin tjahjadi - Academia.edu (original) (raw)

Papers by edwin tjahjadi

IOP Conference Series: Earth and Environmental Science

Reservoir monitoring is important in maintaining water retention and controlling volume changes a... more Reservoir monitoring is important in maintaining water retention and controlling volume changes as well as sedimentation rates. Reservoir monitoring usually uses conventional means such as recording the pole leveling height at a certain time, using large ships with the sounding method and determining the position and depth by utilizing total stations with intersection method measurements. However, such conventional methods require a lot of manpower, a significant period of time, a lot of equipment, and, more often than not, yielding in results that cannot be used to depict the real condition of the corresponding reservoir. This paper uses bathymetric and aerial photographic data to construct land and water topography, the state of the reservoir, and a 3D model of the reservoir, which later can be used as the basis for volume and sedimentation analyses. An effective way of merging the aforementioned data is by utilizing point cloud data generated from bathymetric surveys and UAVs. Th...

Journal of Physics: Conference Series, 2021

Today, off-the-shelf digital cameras are hand on tools for conducting visual inspections in surve... more Today, off-the-shelf digital cameras are hand on tools for conducting visual inspections in surveying and mapping related activities or in structural inspection of industrial objects. Dense point clouds of the inspected object surface are of typical data required and their accuracies are also become more demanding. Deriving these data are off particular interest of this paper instead we work on overlapping images for generating those ones. An imaging geometry of stereo images is exploited further to reveal some drawbacks of the normalized stereo imaging configurations. We utilize a photogrammetric collinearity condition to model physical reality of the imaging process. A sequence of coordinate axes rotations on both images is rearranged as well as preserving normalized images resolutions to be equal to the source ones. Also based upon the prescribed resolutions, an efficient indirect resample is performed to interpolate grey values of the warped images. To ascertain reliability of t...

KnE Engineering, 2019

Orthophoto maps are believed by mapping communities as a favorable media to generate land parcel ... more Orthophoto maps are believed by mapping communities as a favorable media to generate land parcel boundaries for cadaster survey related projects. However, since burgeoning off-the-shelf cameras mounted on the unmanned aerial vehicle (UAV) are commonly utilized for photographing such boundaries, unreliable and unstable intrinsic parameters of these non-metric cameras impede good quality orthophoto productions. This paper presents an alternative method to measure the boundaries reliably without an existence of the orthophoto. A degraded quality of the orthophoto can be circumvented by our newly proposed method so called direct visual referencing. This method comprises two stages. The first step is to perform on the fly camera calibration to minimize instabilities of the intrinsic components of the non-metric camera. Modifying common and widely known flying paths for aerial photogrammetry mission is enabling a block variant self-calibrating bundle adjustments to proceed. The second ste...

Prosiding SEMSINA

Salah satu pemanfaatan teknologi drone yaitu dapat digunakan sebagai upaya mitigasi bencana longs... more Salah satu pemanfaatan teknologi drone yaitu dapat digunakan sebagai upaya mitigasi bencana longsor. Hasil pemotretan foto udara, selain ortofoto yaitu adanya data DEM. Pada dasarnya DEM (Digital Elevation Model) merupakan representasi digital dalam bidang tiga dimensi dari data ketinggian pada permukaan suatu area. Untuk menghasilkan data kelerengan, maka dibutuhkan data dari ketinggian permukaan tanah atau elevasi DEM/DTM (Mahmudi dkk.,2015). Kualitas DEM mengacu pada presisi (ketepatan), reliabilitas (konsisten dalam pengukuran), dan akurasi data terukur. Ukuran presisi dapat dicapai dengan pengukuran fotogrametri dan tingkat presisi yang dihasilkan tergantung pada kualitas sumber data (foto udara). Sebuah DEM akan semakin presisi dan akurat dalam melakukan suatu pemodelan jika mempunyai hasil yang detail dan akurasi yang tepat (Sulistiana dkk., 2019). Secara visual, perbedaan yang mendasar dari DEM non presisi dan DEM presisi yaitu pada DEM presisi memiliki bentuk permukaan yang...

Prosiding SEMSINA

Pada saat ini perkembangan teknologi kamera digital telah berkembang pesat, dengan memiliki kemam... more Pada saat ini perkembangan teknologi kamera digital telah berkembang pesat, dengan memiliki kemampuan resolusi yang bervariatif dan stabilitas kamera yang baik dapat menghasilkan kamera menjadi salah satu alternatif untuk diterapkan pada pekerjaan pemetaan seperti penentuan dimensi pada objek, penggambaran hingga penyajian informasi visual yang cepat dan akurat (Hanifa, 2007). Pada penelitian ini, peneliti memanfaatkan kamera DSLR yang tergolong kamera non metrik sebagai teknologi yang digunakan untuk menentukan dimensi pada objek. Teknik pemotretan menggunakan kamera DSLR perlu di lakukan uji akurasi koordinat dari konfigurasi jaringan pemotretan guna mengetahui bagaimana hasil keakurasian koordinat pada kamera non metrik. Dengan menerapkan metode Close Range Photogrametry (CRP) dapat digunakan sebagai metode alternatif untuk melakukan pemotretan konfigurasi jaringan kamera dengan memanfaatkan teknologi kamera DSLR. Metode tersebut dapat membantu proses pengukuran objek karena ...

Journal of Applied Geospatial Information

Selections of non-metric cameras can be calculated properly starting from choosing the right came... more Selections of non-metric cameras can be calculated properly starting from choosing the right camera sensor size and lens focal length to get better results. Differences in the choice of focal length in shooting can affect the resulting photo. The resulting photo may differ from how much of the object is captured and may suffer distortion due to different selections of the focal length. The purpose of this study is to show the magnitude of the effect of focal length variation in making a three-dimensional model based on the comparison of the results of the three-dimensional model visualization, the comparison of the results of geometric accuracy based on the independent checkpoint coordinate data, and the comparison of the distance results between retro targets. The results of this study indicate that a focal length of 70 mm has better results with the formation of the object completely resembling its original object compared to a focal length of 28 mm which is not good at forming a ...

Jambura Geoscience Review

The morphologies of the Pandansari Village (Ngantang District, Malang Regency, Indonesia) are vul... more The morphologies of the Pandansari Village (Ngantang District, Malang Regency, Indonesia) are vulnerable to landslide disasters that may damage human properties, infrastructures, and even fatalities. Landslide disaster mitigation can be carried out by conducting disaster-prone mapping utilizing Unmanned Aerial Vehicle (UAV) photogrammetry along with geographic information systems (GIS) to produce precise Digital Elevation Model/Digital Terrain Model (DEM/DTM). The purpose of this study is to analyze areas prone to landslides using precision DTM data from UAV technology integrated with geospatial data. DEM is widely used for disaster mapping applications in the form of DTM, representing the ground surface. DTM can be generated from UAV images with photogrammetric processing and additional procedures for removing non-ground objects. This study utilizes PCI Geomatics software to remove vegetation and human-made objects off the ground surfaces semi-automatically. The evaluation revealed...

This paper discovers the role of Triple Helix in improving Small to Medium Enterprises (SMEs)’ te... more This paper discovers the role of Triple Helix in improving Small to Medium Enterprises (SMEs)’ technology capability in developing economies context by testing the model of the role of the Triple Helix in technology transfer program. Characteristics and motives of the transferors have potentially affected the result, and indeed the success, of technology transfer programs. It is important to understand any differences (e.g. characteristic and motives) associated with the process of transferring knowledge and technology of the Triple Helix to SMEs. The findings of characteristics and motives of Triple Helix in the technology transfer programs will support a better understanding of the role of Triple Helix on technology capability. This research also provides empirical evidence to claims that there is a significant effect of technology capability on competitiveness. With 250 respondents, the result provides confidence that the propositions and hypotheses of this study can be tested th...

Journal of Physics: Conference Series, 2021

Unmanned Aerial Vehicle (UAV) is burgeoning technology for conducting aerial photography ranging ... more Unmanned Aerial Vehicle (UAV) is burgeoning technology for conducting aerial photography ranging from recreational purposes to engineering works. Due to its physical design, a mounted camera onto the UAV body is afflicted by engine and other vibrations during flight data acquisitions. In such condition, it is impossible to maintain the camera optical axis truly vertical while it is directed downward to the ground. Unavoidable aircraft tilts causes captured images to be exposed with the camera axis tilted slightly from vertical. In survey and mapping activity when vertical images are intended, the amount by which the optical axis deviates from vertical of more than 3 degrees is not met the work specification. Truly vertical images are necessary for producing high quality map from aerial images. This paper offers robust solution to rectify tilted images to generate equivalent truly vertical ones. We use exterior orientation parameters of the tilted images to perform double steps of tr...

Jambura Geoscience Review

CRP (Close Range Photogrammetry) is a measurement technique that can extract 3D points from an im... more CRP (Close Range Photogrammetry) is a measurement technique that can extract 3D points from an image. This study aims to compare convergent, normal, and combined shooting using drones with close-range photogrammetry methods. In the CRP technique, shooting is carried out using the DJI Phantom 4 Pro Drone with convergent and normal shooting techniques and a combination of both shots. Convergent shooting is done by positioning the drone centered on one point by forming a cone against the bridge object with an angle ranging from 40-90 degrees. While shooting normally is done by positioning the drone by facing a straight line against the object. A comparison of concurrent and normal shooting was carried out to find out better 3D Modeling results. The final result of this research is the visualization of a 3D model object that has a complete texture and resembles its original state in the field, as evidenced by the RMSE value of the 3D convergent model being 0.0940 m, for the RMSE value o...

Buletin Poltanesa

Kekeringan lahan merupakan salah satu permasalahan masyarakat Indonesia yang terjadi pada musim k... more Kekeringan lahan merupakan salah satu permasalahan masyarakat Indonesia yang terjadi pada musim kemarau. Kekeringan lahan mengakibatkan aktivitas pertanian terganggu karena pasokan air terhambat. Salah satu kabupaten yang mengalami kekeringan lahan adalah Kabupaten Lamongan. Penelitian ini bertujuan untuk mengidentifikasi wilayah yang mengalami kekeringan lahan di Kabupaten Lamongan agar dampak kekeringan dapat diminimalisir. Metode identifikasi kekeringan lahan yang digunakan berdasarkan pengolahan data penginderaan jauh, yaitu memanfaatkan data citra satelit Landsat 8 saluran 4 (merah), saluran 5 (Near InfraRed/ NIR), dan saluran 6 (Short Wavelength InfraRed/ SWIR). Sebelum proses pengolahan citra, dilakukan proses penggabungan antar scene (mosaicking). Citra Landsat 8 dipotong sesuai batas administrasi wilayah kabupaten dan diolah berdasarkan algoritma NDDI untuk mengidentifikasi kekeringan lahan. Algoritma yang digunakan terdiri dari parameter tingkat kebasahan air dan tingkat k...

IOP Conference Series: Earth and Environmental Science

The traditional market waste includes household waste. Handling of waste helps reduce the burden ... more The traditional market waste includes household waste. Handling of waste helps reduce the burden of Temporary Disposal Site (TPS). This study aimed to analyze the generation and composition of market waste as well as traders’ perceptions of health protocols in various market classes in Malang Regency. Calculation of the number of samples with the Slovin method. The method of measuring solid waste generation and composition is using SNI 19-3964-1994 for 8 consecutive days. Measurement of generation in weight/volume based on the source of solid waste. Waste sorting is based on the composition of the waste. The maximum market waste generation is in class 1 of 17.402 kg/m2/day in the vegetable stall, while the minimum waste generation is in class 3 of 0.01 kg/m2/day in the plastic stall. The composition of the existing waste is divided into 11 groups, namely compostable solid waste, paper, plastic, diapers, cloth, glass, wood, cans, metal, hazardous waste, and styrofoam. The results of ...

Journal of Physics: Conference Series, 2019

Technology transfer is a way to improve technology capability, especially for Small to Medium Ent... more Technology transfer is a way to improve technology capability, especially for Small to Medium Enterprises (SMEs) in Emerging Economies such as in Indonesia. SMEs are often thought to have insufficient resources for advancing their in-house technology development. Therefore, SMEs need technology transfer programs to increase their technology capability. Government, Business, Universities have been involved in technology transfer program in this country. Using data from about 200 Javanese metal-based SMEs, this paper discovers the technology transfer program from Government, Business, Universities in advancing the SMEs technology capability in Indonesia. The results show that substantial numbers of small to medium enterprises are actively involved in technology transfer programs.

KnE Engineering, 2019

The process and definition of camera calibration have change greatly over recent years. Aerial me... more The process and definition of camera calibration have change greatly over recent years. Aerial metric cameras calibration, for which laboratory and field calibration procedures were a separate process, was performed before and independent of any actual mapping data collection using precise calibration fixtures with an assumption that the camera parameters determined would remain valid for a significant period. In contrast, non-metric cameras are characterized by unstable intrinsic parameters over the times and they are vulnerable to the engine and other vibrations during flight data acquisitions. Moreover, there is no standard calibration procedures exist for these cameras. But, since non-metric camera self-calibration augments the concept of calibration as a part of the measurement process, it can determine the camera intrinsic parameters at the time of the data acquisition as long as highly-convergent geometry and the use of multiple exposures are employed. Therefore, this paper i...

KnE Engineering, 2019

Recently, the Ministry of Agrarian Affairs announces a decree to accelerate a completion of the r... more Recently, the Ministry of Agrarian Affairs announces a decree to accelerate a completion of the registration of land parcels of cadaster maps up to a scale of 1:1000. It is known that the use of Unmanned Aerial Vehicle based mapping system (UAV-Map) can produce orthophoto image with spatial resolution less than 10 cm, but it is not yet known whether UAV-Map implementation is able to identify boundary of land parcel in any condition. Therefore, this paper would analyze the planimetric accuracy that is conformed to the regulation of State Minister of Agrarian Affairs/Head of National Land Agency No.3, 1997 both for urban and rural areas. Two testing areas are established which located on urban area and rural area respectively. Flight missions are conducted using a fixed-wing aircraft equipped with a consumer grade camera and a navigational grade GPS-INS system. Orthophoto maps are produced by using Agisoft Photoscan software. Digitizing of parcel boundaries are followed both on an exi...

KnE Engineering, 2019

Orthophoto mosaic is assembled from aerial perspective images through a process called orthorecti... more Orthophoto mosaic is assembled from aerial perspective images through a process called orthorectification, which eliminate photographic tilts and terrain relief effects. These orthorectified images have been resampled from the original ones that may have been prepared from a DTM which does not accurately model the surface. Meanwhile, some proprietary software such as Agisoft utilizes spatially dense 3D point clouds that are generated from a so called Structure from Motion technique to generate the orthophoto. The software provides a black-box method to regard these clouds as DSM, and it utilizes this surface model to project pixels from the original images. This paper investigates geometric accuracy of the produced orthophoto mosaic according to the American Society of Photogrammetry and Remote Sensing (ASPRS) standards. To minimize scale differences among images, a 35mm fixed-lens camera is mounted on a fixed-wing UAV platform. Flight missions are carried out at around 250m flying ...

…, 2008

Kerusakan fasilitas infrastruktur jalan raya yang diakibatkan oleh bencana alam dan pemakaian yan... more Kerusakan fasilitas infrastruktur jalan raya yang diakibatkan oleh bencana alam dan pemakaian yang berlebihan akan sangat menggerus dana pembangunan, belum lagi banyaknya korban jiwa dan kerugian material dari kecelakaan lalu-lintas yang disebabkan karena ...

KnE Engineering, 2019

A fixed focal length lens (FFL) camera with on-adjustable focal length is common companions for c... more A fixed focal length lens (FFL) camera with on-adjustable focal length is common companions for conducting aerial photography using unmanned aerial vehicles (UAVs) due to its superiority on optical quality and wider maximum aperture, lighter weight and smaller sizes. A wide-angle 35mm FFL Sony a5100 camera had been used extensively in our recent aerial photography campaign using UAV. Since this off-the-self digital camera is categorized into a non-metric one, a stability performance issue in terms of intrinsic parameters raises a considerably attention, particularly on variations of the lens principal distance and principal point’s position relative to the camera’s CCD/CMOS sensor caused by the engine and other vibrations during flight data acquisitions. A series of calibration bundle adjustment was conducted to determine variations in the principal distances and principal point coordinates before commencing, during, and after accomplishment of the flight missions. This paper demons...

Jambura Geoscience Review

Monitoring the deformation of objects in the natural disaster area is one of the anticipative ste... more Monitoring the deformation of objects in the natural disaster area is one of the anticipative steps to reduce losses. In this case, this is an attempt to implement mitigation for the safety and viability of the community. Until this time, many constraint factors in the process of obtaining information regarding the strength of the structure and the changes of shape and dimension (per time unit) of the objects, one of which is the high operational cost and the duration of data processing while using a conventional measuring instrument. Through this article, a fast, cheap, easy, and accurate alternative method to detect deformation of the bridge material structure due to flash flood is only by using a Digital Single Lens Reflex (DSLR) camera. The bridge’s structures were photographed and processed with proprietary software to obtain the retro-reflective coordinate of the target that has been evenly attached to the bridge surface as a reference point. From a series of periodic photosho...

IOP Conference Series: Earth and Environmental Science

Reservoir monitoring is important in maintaining water retention and controlling volume changes a... more Reservoir monitoring is important in maintaining water retention and controlling volume changes as well as sedimentation rates. Reservoir monitoring usually uses conventional means such as recording the pole leveling height at a certain time, using large ships with the sounding method and determining the position and depth by utilizing total stations with intersection method measurements. However, such conventional methods require a lot of manpower, a significant period of time, a lot of equipment, and, more often than not, yielding in results that cannot be used to depict the real condition of the corresponding reservoir. This paper uses bathymetric and aerial photographic data to construct land and water topography, the state of the reservoir, and a 3D model of the reservoir, which later can be used as the basis for volume and sedimentation analyses. An effective way of merging the aforementioned data is by utilizing point cloud data generated from bathymetric surveys and UAVs. Th...

Journal of Physics: Conference Series, 2021

Today, off-the-shelf digital cameras are hand on tools for conducting visual inspections in surve... more Today, off-the-shelf digital cameras are hand on tools for conducting visual inspections in surveying and mapping related activities or in structural inspection of industrial objects. Dense point clouds of the inspected object surface are of typical data required and their accuracies are also become more demanding. Deriving these data are off particular interest of this paper instead we work on overlapping images for generating those ones. An imaging geometry of stereo images is exploited further to reveal some drawbacks of the normalized stereo imaging configurations. We utilize a photogrammetric collinearity condition to model physical reality of the imaging process. A sequence of coordinate axes rotations on both images is rearranged as well as preserving normalized images resolutions to be equal to the source ones. Also based upon the prescribed resolutions, an efficient indirect resample is performed to interpolate grey values of the warped images. To ascertain reliability of t...

KnE Engineering, 2019

Orthophoto maps are believed by mapping communities as a favorable media to generate land parcel ... more Orthophoto maps are believed by mapping communities as a favorable media to generate land parcel boundaries for cadaster survey related projects. However, since burgeoning off-the-shelf cameras mounted on the unmanned aerial vehicle (UAV) are commonly utilized for photographing such boundaries, unreliable and unstable intrinsic parameters of these non-metric cameras impede good quality orthophoto productions. This paper presents an alternative method to measure the boundaries reliably without an existence of the orthophoto. A degraded quality of the orthophoto can be circumvented by our newly proposed method so called direct visual referencing. This method comprises two stages. The first step is to perform on the fly camera calibration to minimize instabilities of the intrinsic components of the non-metric camera. Modifying common and widely known flying paths for aerial photogrammetry mission is enabling a block variant self-calibrating bundle adjustments to proceed. The second ste...

Prosiding SEMSINA

Salah satu pemanfaatan teknologi drone yaitu dapat digunakan sebagai upaya mitigasi bencana longs... more Salah satu pemanfaatan teknologi drone yaitu dapat digunakan sebagai upaya mitigasi bencana longsor. Hasil pemotretan foto udara, selain ortofoto yaitu adanya data DEM. Pada dasarnya DEM (Digital Elevation Model) merupakan representasi digital dalam bidang tiga dimensi dari data ketinggian pada permukaan suatu area. Untuk menghasilkan data kelerengan, maka dibutuhkan data dari ketinggian permukaan tanah atau elevasi DEM/DTM (Mahmudi dkk.,2015). Kualitas DEM mengacu pada presisi (ketepatan), reliabilitas (konsisten dalam pengukuran), dan akurasi data terukur. Ukuran presisi dapat dicapai dengan pengukuran fotogrametri dan tingkat presisi yang dihasilkan tergantung pada kualitas sumber data (foto udara). Sebuah DEM akan semakin presisi dan akurat dalam melakukan suatu pemodelan jika mempunyai hasil yang detail dan akurasi yang tepat (Sulistiana dkk., 2019). Secara visual, perbedaan yang mendasar dari DEM non presisi dan DEM presisi yaitu pada DEM presisi memiliki bentuk permukaan yang...

Prosiding SEMSINA

Pada saat ini perkembangan teknologi kamera digital telah berkembang pesat, dengan memiliki kemam... more Pada saat ini perkembangan teknologi kamera digital telah berkembang pesat, dengan memiliki kemampuan resolusi yang bervariatif dan stabilitas kamera yang baik dapat menghasilkan kamera menjadi salah satu alternatif untuk diterapkan pada pekerjaan pemetaan seperti penentuan dimensi pada objek, penggambaran hingga penyajian informasi visual yang cepat dan akurat (Hanifa, 2007). Pada penelitian ini, peneliti memanfaatkan kamera DSLR yang tergolong kamera non metrik sebagai teknologi yang digunakan untuk menentukan dimensi pada objek. Teknik pemotretan menggunakan kamera DSLR perlu di lakukan uji akurasi koordinat dari konfigurasi jaringan pemotretan guna mengetahui bagaimana hasil keakurasian koordinat pada kamera non metrik. Dengan menerapkan metode Close Range Photogrametry (CRP) dapat digunakan sebagai metode alternatif untuk melakukan pemotretan konfigurasi jaringan kamera dengan memanfaatkan teknologi kamera DSLR. Metode tersebut dapat membantu proses pengukuran objek karena ...

Journal of Applied Geospatial Information

Selections of non-metric cameras can be calculated properly starting from choosing the right came... more Selections of non-metric cameras can be calculated properly starting from choosing the right camera sensor size and lens focal length to get better results. Differences in the choice of focal length in shooting can affect the resulting photo. The resulting photo may differ from how much of the object is captured and may suffer distortion due to different selections of the focal length. The purpose of this study is to show the magnitude of the effect of focal length variation in making a three-dimensional model based on the comparison of the results of the three-dimensional model visualization, the comparison of the results of geometric accuracy based on the independent checkpoint coordinate data, and the comparison of the distance results between retro targets. The results of this study indicate that a focal length of 70 mm has better results with the formation of the object completely resembling its original object compared to a focal length of 28 mm which is not good at forming a ...

Jambura Geoscience Review

The morphologies of the Pandansari Village (Ngantang District, Malang Regency, Indonesia) are vul... more The morphologies of the Pandansari Village (Ngantang District, Malang Regency, Indonesia) are vulnerable to landslide disasters that may damage human properties, infrastructures, and even fatalities. Landslide disaster mitigation can be carried out by conducting disaster-prone mapping utilizing Unmanned Aerial Vehicle (UAV) photogrammetry along with geographic information systems (GIS) to produce precise Digital Elevation Model/Digital Terrain Model (DEM/DTM). The purpose of this study is to analyze areas prone to landslides using precision DTM data from UAV technology integrated with geospatial data. DEM is widely used for disaster mapping applications in the form of DTM, representing the ground surface. DTM can be generated from UAV images with photogrammetric processing and additional procedures for removing non-ground objects. This study utilizes PCI Geomatics software to remove vegetation and human-made objects off the ground surfaces semi-automatically. The evaluation revealed...

This paper discovers the role of Triple Helix in improving Small to Medium Enterprises (SMEs)’ te... more This paper discovers the role of Triple Helix in improving Small to Medium Enterprises (SMEs)’ technology capability in developing economies context by testing the model of the role of the Triple Helix in technology transfer program. Characteristics and motives of the transferors have potentially affected the result, and indeed the success, of technology transfer programs. It is important to understand any differences (e.g. characteristic and motives) associated with the process of transferring knowledge and technology of the Triple Helix to SMEs. The findings of characteristics and motives of Triple Helix in the technology transfer programs will support a better understanding of the role of Triple Helix on technology capability. This research also provides empirical evidence to claims that there is a significant effect of technology capability on competitiveness. With 250 respondents, the result provides confidence that the propositions and hypotheses of this study can be tested th...

Journal of Physics: Conference Series, 2021

Unmanned Aerial Vehicle (UAV) is burgeoning technology for conducting aerial photography ranging ... more Unmanned Aerial Vehicle (UAV) is burgeoning technology for conducting aerial photography ranging from recreational purposes to engineering works. Due to its physical design, a mounted camera onto the UAV body is afflicted by engine and other vibrations during flight data acquisitions. In such condition, it is impossible to maintain the camera optical axis truly vertical while it is directed downward to the ground. Unavoidable aircraft tilts causes captured images to be exposed with the camera axis tilted slightly from vertical. In survey and mapping activity when vertical images are intended, the amount by which the optical axis deviates from vertical of more than 3 degrees is not met the work specification. Truly vertical images are necessary for producing high quality map from aerial images. This paper offers robust solution to rectify tilted images to generate equivalent truly vertical ones. We use exterior orientation parameters of the tilted images to perform double steps of tr...

Jambura Geoscience Review

CRP (Close Range Photogrammetry) is a measurement technique that can extract 3D points from an im... more CRP (Close Range Photogrammetry) is a measurement technique that can extract 3D points from an image. This study aims to compare convergent, normal, and combined shooting using drones with close-range photogrammetry methods. In the CRP technique, shooting is carried out using the DJI Phantom 4 Pro Drone with convergent and normal shooting techniques and a combination of both shots. Convergent shooting is done by positioning the drone centered on one point by forming a cone against the bridge object with an angle ranging from 40-90 degrees. While shooting normally is done by positioning the drone by facing a straight line against the object. A comparison of concurrent and normal shooting was carried out to find out better 3D Modeling results. The final result of this research is the visualization of a 3D model object that has a complete texture and resembles its original state in the field, as evidenced by the RMSE value of the 3D convergent model being 0.0940 m, for the RMSE value o...

Buletin Poltanesa

Kekeringan lahan merupakan salah satu permasalahan masyarakat Indonesia yang terjadi pada musim k... more Kekeringan lahan merupakan salah satu permasalahan masyarakat Indonesia yang terjadi pada musim kemarau. Kekeringan lahan mengakibatkan aktivitas pertanian terganggu karena pasokan air terhambat. Salah satu kabupaten yang mengalami kekeringan lahan adalah Kabupaten Lamongan. Penelitian ini bertujuan untuk mengidentifikasi wilayah yang mengalami kekeringan lahan di Kabupaten Lamongan agar dampak kekeringan dapat diminimalisir. Metode identifikasi kekeringan lahan yang digunakan berdasarkan pengolahan data penginderaan jauh, yaitu memanfaatkan data citra satelit Landsat 8 saluran 4 (merah), saluran 5 (Near InfraRed/ NIR), dan saluran 6 (Short Wavelength InfraRed/ SWIR). Sebelum proses pengolahan citra, dilakukan proses penggabungan antar scene (mosaicking). Citra Landsat 8 dipotong sesuai batas administrasi wilayah kabupaten dan diolah berdasarkan algoritma NDDI untuk mengidentifikasi kekeringan lahan. Algoritma yang digunakan terdiri dari parameter tingkat kebasahan air dan tingkat k...

IOP Conference Series: Earth and Environmental Science

The traditional market waste includes household waste. Handling of waste helps reduce the burden ... more The traditional market waste includes household waste. Handling of waste helps reduce the burden of Temporary Disposal Site (TPS). This study aimed to analyze the generation and composition of market waste as well as traders’ perceptions of health protocols in various market classes in Malang Regency. Calculation of the number of samples with the Slovin method. The method of measuring solid waste generation and composition is using SNI 19-3964-1994 for 8 consecutive days. Measurement of generation in weight/volume based on the source of solid waste. Waste sorting is based on the composition of the waste. The maximum market waste generation is in class 1 of 17.402 kg/m2/day in the vegetable stall, while the minimum waste generation is in class 3 of 0.01 kg/m2/day in the plastic stall. The composition of the existing waste is divided into 11 groups, namely compostable solid waste, paper, plastic, diapers, cloth, glass, wood, cans, metal, hazardous waste, and styrofoam. The results of ...

Journal of Physics: Conference Series, 2019

Technology transfer is a way to improve technology capability, especially for Small to Medium Ent... more Technology transfer is a way to improve technology capability, especially for Small to Medium Enterprises (SMEs) in Emerging Economies such as in Indonesia. SMEs are often thought to have insufficient resources for advancing their in-house technology development. Therefore, SMEs need technology transfer programs to increase their technology capability. Government, Business, Universities have been involved in technology transfer program in this country. Using data from about 200 Javanese metal-based SMEs, this paper discovers the technology transfer program from Government, Business, Universities in advancing the SMEs technology capability in Indonesia. The results show that substantial numbers of small to medium enterprises are actively involved in technology transfer programs.

KnE Engineering, 2019

The process and definition of camera calibration have change greatly over recent years. Aerial me... more The process and definition of camera calibration have change greatly over recent years. Aerial metric cameras calibration, for which laboratory and field calibration procedures were a separate process, was performed before and independent of any actual mapping data collection using precise calibration fixtures with an assumption that the camera parameters determined would remain valid for a significant period. In contrast, non-metric cameras are characterized by unstable intrinsic parameters over the times and they are vulnerable to the engine and other vibrations during flight data acquisitions. Moreover, there is no standard calibration procedures exist for these cameras. But, since non-metric camera self-calibration augments the concept of calibration as a part of the measurement process, it can determine the camera intrinsic parameters at the time of the data acquisition as long as highly-convergent geometry and the use of multiple exposures are employed. Therefore, this paper i...

KnE Engineering, 2019

Recently, the Ministry of Agrarian Affairs announces a decree to accelerate a completion of the r... more Recently, the Ministry of Agrarian Affairs announces a decree to accelerate a completion of the registration of land parcels of cadaster maps up to a scale of 1:1000. It is known that the use of Unmanned Aerial Vehicle based mapping system (UAV-Map) can produce orthophoto image with spatial resolution less than 10 cm, but it is not yet known whether UAV-Map implementation is able to identify boundary of land parcel in any condition. Therefore, this paper would analyze the planimetric accuracy that is conformed to the regulation of State Minister of Agrarian Affairs/Head of National Land Agency No.3, 1997 both for urban and rural areas. Two testing areas are established which located on urban area and rural area respectively. Flight missions are conducted using a fixed-wing aircraft equipped with a consumer grade camera and a navigational grade GPS-INS system. Orthophoto maps are produced by using Agisoft Photoscan software. Digitizing of parcel boundaries are followed both on an exi...

KnE Engineering, 2019

Orthophoto mosaic is assembled from aerial perspective images through a process called orthorecti... more Orthophoto mosaic is assembled from aerial perspective images through a process called orthorectification, which eliminate photographic tilts and terrain relief effects. These orthorectified images have been resampled from the original ones that may have been prepared from a DTM which does not accurately model the surface. Meanwhile, some proprietary software such as Agisoft utilizes spatially dense 3D point clouds that are generated from a so called Structure from Motion technique to generate the orthophoto. The software provides a black-box method to regard these clouds as DSM, and it utilizes this surface model to project pixels from the original images. This paper investigates geometric accuracy of the produced orthophoto mosaic according to the American Society of Photogrammetry and Remote Sensing (ASPRS) standards. To minimize scale differences among images, a 35mm fixed-lens camera is mounted on a fixed-wing UAV platform. Flight missions are carried out at around 250m flying ...

…, 2008

Kerusakan fasilitas infrastruktur jalan raya yang diakibatkan oleh bencana alam dan pemakaian yan... more Kerusakan fasilitas infrastruktur jalan raya yang diakibatkan oleh bencana alam dan pemakaian yang berlebihan akan sangat menggerus dana pembangunan, belum lagi banyaknya korban jiwa dan kerugian material dari kecelakaan lalu-lintas yang disebabkan karena ...

KnE Engineering, 2019

A fixed focal length lens (FFL) camera with on-adjustable focal length is common companions for c... more A fixed focal length lens (FFL) camera with on-adjustable focal length is common companions for conducting aerial photography using unmanned aerial vehicles (UAVs) due to its superiority on optical quality and wider maximum aperture, lighter weight and smaller sizes. A wide-angle 35mm FFL Sony a5100 camera had been used extensively in our recent aerial photography campaign using UAV. Since this off-the-self digital camera is categorized into a non-metric one, a stability performance issue in terms of intrinsic parameters raises a considerably attention, particularly on variations of the lens principal distance and principal point’s position relative to the camera’s CCD/CMOS sensor caused by the engine and other vibrations during flight data acquisitions. A series of calibration bundle adjustment was conducted to determine variations in the principal distances and principal point coordinates before commencing, during, and after accomplishment of the flight missions. This paper demons...

Jambura Geoscience Review

Monitoring the deformation of objects in the natural disaster area is one of the anticipative ste... more Monitoring the deformation of objects in the natural disaster area is one of the anticipative steps to reduce losses. In this case, this is an attempt to implement mitigation for the safety and viability of the community. Until this time, many constraint factors in the process of obtaining information regarding the strength of the structure and the changes of shape and dimension (per time unit) of the objects, one of which is the high operational cost and the duration of data processing while using a conventional measuring instrument. Through this article, a fast, cheap, easy, and accurate alternative method to detect deformation of the bridge material structure due to flash flood is only by using a Digital Single Lens Reflex (DSLR) camera. The bridge’s structures were photographed and processed with proprietary software to obtain the retro-reflective coordinate of the target that has been evenly attached to the bridge surface as a reference point. From a series of periodic photosho...