LASER Tornado Mitigation SEAC Poster (original) (raw)
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Archaeological applications using airborne laser scanning (ALS) are increasing in number. Since the production of ALS-derived digital terrain models (DTM) involves a considerable amount of money, most applications use general purpose ALS data, which are usually cheaper and sometimes even provided for free for scientific applications. The main problem that comes with this kind of data is the frequent lack of meta-information. The archaeologist often does not get the information about original point density, time of flight, instrument used, type of flying platform, filter and DTM generation procedure etc. Therefore, ALS becomes a kind of “black box”, where the derived DTM is used without further knowledge about underlying technology, algorithms, and metadata. Consequently, there is a certain risk that the data used will not be suitable for the archaeological application. Based on the experience of a two-year project “LiDAR-Supported Archaeological Prospection in Woodland”, the paper will give a review on archaeological ALS, explain its the basic process, demonstrate its potential for landscape archaeology especially in densely forested areas, and draw the attention to some critical parameters of ALS, which should be known to the user. Finally, further issues, which need to be solved in near future, are discussed.
AIRBORNE LASER SCANNING AND IMAGE PROCESSING TECHNIQUES FOR ARCHAEOLOGICAL PROSPECTION
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XL-5, 2014
Aerial photography was, for decades, an invaluable tool for archaeological prospection, in spite of the limitation of this method to deforested areas. The airborne laser scanning (ALS) method can be nowadays used to map complex areas and suitable complement earlier findings. This article describes visualization and image processing methods that can be applied on digital terrain models (DTMs) to highlight objects hidden in the landscape. Thanks to the analysis of visualized DTM it is possible to understand the landscape evolution including the differentiation between natural processes and human interventions. Different visualization methods were applied on a case study area. A system of parallel tracks hidden in a forest and its surroundings-part of old route called "Devil's Furrow" near the town of Sázava was chosen. The whole area around well known part of Devil's Furrow has not been prospected systematically yet. The data from the airborne laser scanning acquired by the Czech Office for Surveying, Mapping and Cadastre was used. The average density of the point cloud was approximately 1 point/m 2. The goal of the project was to visualize the utmost smallest terrain discontinuities, e.g. tracks and erosion furrows, which some were not wholly preserved. Generally we were interested in objects that are clearly not visible in DTMs displayed in the form of shaded relief. Some of the typical visualization methods were tested (shaded relief, aspect and slope image). To get better results we applied image-processing methods that were successfully used on aerial photographs or hyperspectral images in the past. The usage of different visualization techniques on one site allowed us to verify the natural character of the southern part of Devil's Furrow and find formations up to now hidden in the forests.
AIRBORNE LASER SCANNING AND LANDSCAPE ARCHAEOLOGY
Opuscula archaeologica 39/40(1), 2018
Airborne lidar (Light Detection And Ranging), ALS or ALSM (Airborne Laser Scanning, Airborne Laser Swath Mapping) is an active remote sensing technique , which records the surface of the earth using laser scanning. ALS allows very precise three-dimensional mapping of the surface of the earth, producing high-resolution topographic data, even where surface is obscured by forest and vegetation. The level of detail on digital surface and terrain models produced from high resolution ALS topographic data helps us enormously in identification of past events, which reworked and modified the surface of the earth. However , interpretation of ALS data poses much more than technical challenges. ALS does not provide only a layer of data, but offers a different view of landscape. What kind of landscapes do we see with ALS?
The Advantages of Using Laser Scanners in Surveying in Protected Sites
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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLI-B5, 2016
This paper deals with the non-destructive documentation of the "Radkov" (Svitavy district, Czech Republic) archaeological site. ALS, GPR and land survey mapping will be used for the analysis. The fortified hilltop settlement "Radkov" is an immovable historical monument with preserved relics of anthropogenic origin in relief. Terrain reconnaissance can identify several accentuated objects on site. ALS enables identification of poorly recognizable archaeological objects and their contexture in the field. Geophysical survey enables defunct objects identification. These objects are hidden below the current ground surface and their layout is crucial. Land survey mapping provides technical support for ALS and GPR survey. It enables data georeferencing in geodetic reference systems. GIS can then be used for data analysis. M. Cejpová and J. Němcová have studied this site over a long period of time. In 2012 Radkov was surveyed using ALS in the project "The Research of Ancient Road in Southwest Moravia and East Bohemia". Since 2015 the authors have been examining this site. This paper summarises the existing results of the work of these authors. The digital elevation model in the form of a grid (GDEM) with a resolution 1 m of 2012 was the basis for this work. In 2015 the survey net, terrain reconnaissance and GPR survey of two archaeological objects were done at the site. GDEM was compared with these datasets. All datasets were processed individually and its results were compared in ArcGIS.
, 2017. An integrated airborne laser scanning approach to forest management and cultural heritage issues: a case study at Porolissum, Romania. Ann. For. Res. 60(1): _-_. Abstract. This paper explores the opportunities that arise where forest ecosystem management and cultural heritage monuments protection converge. The case study area for our analysis was the landscape surrounding the Moigrad-Porolissum Archaeological site. We emphasize that an Airborne Laser Scanning (ALS or LiDAR-Light Detection and Ranging) approach to both forest management and cultural heritage conservation is an outstanding tool, assisting policy-makers and conservationists in decision making for integrated planning and management of the environment. LiDAR-derived surface models enabled a synoptic, never-seen-before view of the ancient Roman frontiers defensive systems while also revealing the present forest road network. The thorough and accurate road inventory data are very useful for updating and modifying forest base maps and registries and also for identifying the priority sectors for archaeological discharge. The ability to identify and determine optimal routes for forest management and to locate previously unmapped ancient archaeological remains aids in reducing costs and creating operational efficiencies as well as in complying with the legislation and avoiding infringements. The potential of LiDAR to demonstrate the long-term and comprehensive human impact on wooded areas is discussed. We identified a significant historical landscape change, consisting of a deforestation period, spanning over more than 160 years, during the Roman Period in Dacia (106-271 AD). The transdisciplinary analysis of the LiDAR data provides the base for combining knowledge from archaeology, forestry and environmental history in order to achieve a thorough analysis of the landscape changes and history. In the " nature versus culture " dichotomy, the landscape, outfield areas and forests are primarily perceived as nature, while in reality they are often heavily marked by human impact. LiDAR offers an efficient method for broadening our knowledge regarding the character and extent of human interaction with landscapes – forested or otherwise.
LiDAR for Archaeological Research and the Study of Historical Landscapes
Sensing the Past, 2017
Remote sensing technologies have helped to revolutionize archaeology. LiDAR (light detection and ranging), a remote sensing technology in which lasers are used as topographic scanners that can penetrate foliage, has particularly influenced researchers in the field of settlement or landscape archaeology. LiDAR provides detailed landscape data for broad spatial areas and permits visualization of these landscapes in ways that were never before possible. These data and visualizations have been widely utilized to gain a better understanding of historical landscapes and their past uses by ancient peoples.
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Barong cave, located in West Java, Indonesia, is one of the caves within the cultural heritage site of Pawon cave, which has the potential to have been a human settlement based on the artifacts found there. However, the site has faced challenges such as vandalism, lack of proper management and preservation efforts, and the negative impacts of limestone mining. Terrestrial Laser Scanner (TLS) have gained attention as a tool for cave measurement and documentation, but there is limited research on their use for cultural heritage preservation in Indonesian caves. This study focuses on documenting and creating a 3D model of Barong cave using TLS, with a specific exploration of the intensity values of point cloud data obtained from TLS near-infrared wave. Data acquisition was successfully carried out, resulting in detailed digital models of the cave. Although manual identification of vandalism using TLS was limited, our study demonstrated the potential of TLS as a tool for identifying vandalism in caves. Further research, including the development of augmented reality and virtual reality applications for museums and education, and automated identification of markings on 3D point cloud data using intensity values for cave art, requires further development. * Corresponding author in the form of bone fragments were also found. From this, it can be inferred that in the past, all the caves in those area were used as settlement by prehistoric humans.
A new project has been initiated by the State Office for Cultural Heritage Management Baden-Württemberg for the laminar analysis of LiDAR data in Baden-Württemberg. This project is part of the archaeological prospection system in Baden-Württemberg. New techniques for detection of archaeological structures using special data processing methods on LiDAR data were developed. The focus of this project is on the totality of visible structures presumed to be archaeological sites or at least elements of the historic landscape in LiDAR imagery in the whole state of Baden-Württemberg. Based on the complete high resolution LiDAR data set of the surface of Baden-Württemberg a comprehensive mapping of all potential sites in an area of 35,751km2 is the aim of the three year project.