susana pozo - Academia.edu (original) (raw)

Papers by susana pozo

Research paper thumbnail of Integrated Approach for Detecting Convection Effects in Geothermal Environments Based on TIR Camera Measurements

Applied Sciences, 2021

Thermal characterization of soils is essential for many applications, including design of geother... more Thermal characterization of soils is essential for many applications, including design of geothermal systems. Traditional devices focus on the computation of thermal conductivity, omitting the analysis of the convection effect, which is important for horizontal geothermal systems. In this paper, a procedure based on the monitoring of the surface of the soil with a thermal infrared (TIR) camera is developed for the evaluation of the global thermal imbalance on the surface and in-depth. This procedure allows for the computation of thermal conductivity and global convection heat rate, consequently constituting a complete thermal characterization of the geothermal system. The validation of the results is performed through the evaluation of the radiometric calibration of the thermal infrared camera used for the monitoring and the comparison of the thermal conductivity values obtained in-depth, with traditional methods, and for the surface of the system.

Research paper thumbnail of Hyperspectral imaging and robust statistics in non-melanoma skin cancer analysis

Biomedical Optics Express, 2021

Non-Melanoma skin cancer is one of the most frequent types of cancer. Early detection is encourag... more Non-Melanoma skin cancer is one of the most frequent types of cancer. Early detection is encouraged so as to ensure the best treatment, Hyperspectral imaging is a promising technique for non-invasive inspection of skin lesions, however, the optimal wavelengths for these purposes are yet to be conclusively determined. A visible-near infrared hyperspectral camera with an ad-hoc built platform was used for image acquisition in the present study. Robust statistical techniques were used to conclude an optimal range between 573.45 and 779.88 nm to distinguish between healthy and non-healthy skin. Wavelengths between 429.16 and 520.17 nm were additionally found to be optimal for the differentiation between cancer types.

Research paper thumbnail of Retrieving Land Surface Temperature from Satellite Imagery with a Novel Combined Strategy

Remote Sensing, 2020

Land surface temperature (LST) is a key parameter for land cover analysis and for many fields of ... more Land surface temperature (LST) is a key parameter for land cover analysis and for many fields of study, for example, in agriculture, due to its relationship with the state of the crop in the evaluation of natural phenomena such as volcanic eruptions and geothermal areas, in desertification studies, or in the estimation of several variables of environmental interest such as evapotranspiration. The computation of LST from satellite imagery is possible due to the advances in thermal infrared technology and its implementation in artificial satellites. For example, Landsat 8 incorporates Operational Land Imager(OLI) and Thermal InfraRed Sensor(TIRS)sensors the images from which, in combination with data from other satellite platforms (such as Terra and Aqua) provide all the information needed for the computation of LST. Different methodologies have been developed for the computation of LST from satellite images, such as single-channel and split-window methodologies. In this paper, two ex...

Research paper thumbnail of Comparing Terrestrial Laser Scanning (TLS) and Wearable Laser Scanning (WLS) for Individual Tree Modeling at Plot Level

Remote Sensing, 2018

This study presents a comparison between the use of wearable laser scanning (WLS) and terrestrial... more This study presents a comparison between the use of wearable laser scanning (WLS) and terrestrial laser scanning (TLS) devices for automatic tree detection with an estimation of two dendrometric variables: diameter at breast height (DBH) and total tree height (TH). Operative processes for data collection and automatic forest inventory are described in detail. The approach used is based on the clustering of points belonging to each individual tree, the isolation of the trunks, the iterative fitting of circles for the DBH calculation and the computation of the TH of each tree. TLS and WLS point clouds were compared by the statistical analysis of both estimated forest dendrometric parameters and the possible presence of bias. Results show that the apparent differences in point density and relative precision between both 3D forest models do not affect tree detection and DBH estimation. Nevertheless, tree height estimation using WLS appears to be affected by the limited scanning range of the WLS used in this study. TH estimations for trees below a certain height are equivalent using WLS or TLS, whereas TH of taller trees is clearly underestimated using WLS.

Research paper thumbnail of Optimized Planning of Terrestrial Laser-scanner Surveys in Complex Archaeological Environments

International Journal of Earth & Environmental Sciences, 2017

The application of terrestrial laser scanning incomplex archaeologicalsites is an increasingly co... more The application of terrestrial laser scanning incomplex archaeologicalsites is an increasingly common fact in the last years. This equipment allows a quick and massive digitalization of the scanned surface, what reverts to achieve very detailed time series of the study area in a low-cost way. The main problem for this labour is to have the expertise to stablish the minimum number of scanning stations and their optimal location. If the archaeological site is really complex, the in situ decisions about the number and positions of scans can be very difficult only suitable for experts in laser scanning. Trying to provide a useful tool for archaeologists, this paper presents a methodology for planning and optimizing the scans locations taking advance of existing cartographic products. As a result, the archaeologist can plan the scanning surveying, improving and optimizing the scan positions from the office. This approach was validated over the complex archaeological site of El Tolmo de Minateda located in Albacete (Spain).

Research paper thumbnail of Integrated Approach for Detecting Convection Effects in Geothermal Environments Based on TIR Camera Measurements

Applied Sciences, 2021

Thermal characterization of soils is essential for many applications, including design of geother... more Thermal characterization of soils is essential for many applications, including design of geothermal systems. Traditional devices focus on the computation of thermal conductivity, omitting the analysis of the convection effect, which is important for horizontal geothermal systems. In this paper, a procedure based on the monitoring of the surface of the soil with a thermal infrared (TIR) camera is developed for the evaluation of the global thermal imbalance on the surface and in-depth. This procedure allows for the computation of thermal conductivity and global convection heat rate, consequently constituting a complete thermal characterization of the geothermal system. The validation of the results is performed through the evaluation of the radiometric calibration of the thermal infrared camera used for the monitoring and the comparison of the thermal conductivity values obtained in-depth, with traditional methods, and for the surface of the system.

Research paper thumbnail of Hyperspectral imaging and robust statistics in non-melanoma skin cancer analysis

Biomedical Optics Express, 2021

Non-Melanoma skin cancer is one of the most frequent types of cancer. Early detection is encourag... more Non-Melanoma skin cancer is one of the most frequent types of cancer. Early detection is encouraged so as to ensure the best treatment, Hyperspectral imaging is a promising technique for non-invasive inspection of skin lesions, however, the optimal wavelengths for these purposes are yet to be conclusively determined. A visible-near infrared hyperspectral camera with an ad-hoc built platform was used for image acquisition in the present study. Robust statistical techniques were used to conclude an optimal range between 573.45 and 779.88 nm to distinguish between healthy and non-healthy skin. Wavelengths between 429.16 and 520.17 nm were additionally found to be optimal for the differentiation between cancer types.

Research paper thumbnail of Retrieving Land Surface Temperature from Satellite Imagery with a Novel Combined Strategy

Remote Sensing, 2020

Land surface temperature (LST) is a key parameter for land cover analysis and for many fields of ... more Land surface temperature (LST) is a key parameter for land cover analysis and for many fields of study, for example, in agriculture, due to its relationship with the state of the crop in the evaluation of natural phenomena such as volcanic eruptions and geothermal areas, in desertification studies, or in the estimation of several variables of environmental interest such as evapotranspiration. The computation of LST from satellite imagery is possible due to the advances in thermal infrared technology and its implementation in artificial satellites. For example, Landsat 8 incorporates Operational Land Imager(OLI) and Thermal InfraRed Sensor(TIRS)sensors the images from which, in combination with data from other satellite platforms (such as Terra and Aqua) provide all the information needed for the computation of LST. Different methodologies have been developed for the computation of LST from satellite images, such as single-channel and split-window methodologies. In this paper, two ex...

Research paper thumbnail of Comparing Terrestrial Laser Scanning (TLS) and Wearable Laser Scanning (WLS) for Individual Tree Modeling at Plot Level

Remote Sensing, 2018

This study presents a comparison between the use of wearable laser scanning (WLS) and terrestrial... more This study presents a comparison between the use of wearable laser scanning (WLS) and terrestrial laser scanning (TLS) devices for automatic tree detection with an estimation of two dendrometric variables: diameter at breast height (DBH) and total tree height (TH). Operative processes for data collection and automatic forest inventory are described in detail. The approach used is based on the clustering of points belonging to each individual tree, the isolation of the trunks, the iterative fitting of circles for the DBH calculation and the computation of the TH of each tree. TLS and WLS point clouds were compared by the statistical analysis of both estimated forest dendrometric parameters and the possible presence of bias. Results show that the apparent differences in point density and relative precision between both 3D forest models do not affect tree detection and DBH estimation. Nevertheless, tree height estimation using WLS appears to be affected by the limited scanning range of the WLS used in this study. TH estimations for trees below a certain height are equivalent using WLS or TLS, whereas TH of taller trees is clearly underestimated using WLS.

Research paper thumbnail of Optimized Planning of Terrestrial Laser-scanner Surveys in Complex Archaeological Environments

International Journal of Earth & Environmental Sciences, 2017

The application of terrestrial laser scanning incomplex archaeologicalsites is an increasingly co... more The application of terrestrial laser scanning incomplex archaeologicalsites is an increasingly common fact in the last years. This equipment allows a quick and massive digitalization of the scanned surface, what reverts to achieve very detailed time series of the study area in a low-cost way. The main problem for this labour is to have the expertise to stablish the minimum number of scanning stations and their optimal location. If the archaeological site is really complex, the in situ decisions about the number and positions of scans can be very difficult only suitable for experts in laser scanning. Trying to provide a useful tool for archaeologists, this paper presents a methodology for planning and optimizing the scans locations taking advance of existing cartographic products. As a result, the archaeologist can plan the scanning surveying, improving and optimizing the scan positions from the office. This approach was validated over the complex archaeological site of El Tolmo de Minateda located in Albacete (Spain).