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29:13 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2016

Spatial tools for LiDAR based watershed management and forestry analysis integrated in gvSIG

In 2014 we started the development of the library LESTO (LiDAR Empowered Sciences Toolbox Opensource): a set of modules for the analysis of LiDAR point cloud with an Open Source approach with the aim of improving the performance of the extraction of the volume of biomass and other vegetation parameters on large areas for mixed forest structures. LESTO contains a set of modules for data handling and analysis implemented within the JGrassTools spatial processing library. The main subsections are dedicated to: preprocessing of LiDAR raw data (LAS), creation of raster derived products, normalization of the intensity values and tools for extraction of vegetation and buildings. The core of the LESTO library is the extraction of the vegetation parameters. We decided to follow the single tree based approach and implemented the extraction of tops and crowns from local maxima, the region growing method and the watershed method, all can be applied on LiDAR derived raster datasets as well as point clouds of raw data. An automatic validation procedure has been developed considering an Optimizer Algorithm based on Particle Swarm (PS) and a matching procedure which takes the position and the height of the extracted trees respect to the measured ones and iteratively tries to improve the candidate solution changing the models' parameters. On a watershed level, the resulting extracted trees with position and main characteristics, can be used for forestry management or for the evaluation of natural hazards (hillslopes stability, large wood transportation during floods).
  • Published: 2016
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
21:33 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2016

Digital field mapping with Geopaparazzi and gvSIG

Geopaparazzi is an application for fast field surveys. Its simplicity and the possibility to use it on as good as any android smartphone makes it a trusty field companion for engineers and geologists, but also for tourists who wish to keep a geodiary and any user that needs to be aware of his position even in offline mode. In Geopaparazzi it is possible to create text and picture notes and place them on the map. Notes can also be complex and form based in order to standardize surveys in which many people need to be coordinated. The data collected in the field can be directly exported from Geopaparazzi as KMZ or GPX. The plugin for Geopaparazzi in gvSIG supplies an userfriendly GUI with GIS functionalities to visualize all the data collected in the field, GPS tracks, text notes, pictures and form based notes and gives the possibility to save them as shapefiles. It works as a useful and fast tool to check the data collected in the field within a GIS directly from the file of the Geopaparazzi project without the need to export and save different shapefile. With this tool it is also possible to share projects with others, check the contents and periodically verify the results of the surveys.
  • Published: 2016
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
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