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OSGeo

Content related to the Open Source Geospatial (OSGeo) Foundation, Projects, and Community.

FOSS Use at DRCOG

in FOSS4G, FOSS4G2011, Video, OSGeo
OSGeo

A member of DRCOG talks about what DRCOG is and how it is using FOSS software.

Event: 
FOSS4G2011
Speaker: 
DRCOG

Tuning GDAL Raster Performance

in FOSS4G, FOSS4G2011, Video, OSGeo
OSGeo

Web mapping performance is often constrained by the speed of access to the underlying geospatial data. A comparison of different file formats, image organization techniques, compression, caching and other factors will be discussed in the context of their impact on performance for raster data access intensive applications. Results will be presented for the particular case of web mapping with MapServer on top of the GDAL raster data access library.

Event: 
FOSS4G2011
Speaker: 
Frank Warmerdam

Open Source LiDAR Visualization Using GRASS GIS

in FOSS4G, FOSS4G2011, Video, OSGeo
OSGeo

In the summer of 2010, funding was secured for a LiDAR survey of the CU-Boulder campus as part of a solar energy potential and photovoltaic planning study. Following data acquisition, 20 square kilometers were modeled using only open source tools. While Martin Isenburg’s NSF-funded work on LiDAR processing (LAStools) was used to extract and convert data out of the propriety ‘.las’ format, the majority of the processing, visualization and analysis work was done using the Open Source Geospatial Foundation project GRASS GIS. Processing included filtering, raster generation through inverse distance weighting and raster generation using regularized splines with tension. Analysis of insolation was accomplished using the GRASS GIS implementation of the SOLPOS 2.0 (SOLar POSition and intensity) algorithm developed and maintained by the National Renewable Energy Laboratory (NREL). This raster data was combined with preexisting building footprint vector data from the campus GIS system to facilitate site selection of solar candidates. The end result was modeled for display using the NVIZ modeling and visualization system within GRASS, and was then supplemented with orthophotos for draping and comparison. The data visualizations of campus solar sites take into account day length, position of the sun, seasonal atmospheric effects, orientation and the local shading effects from trees, buildings and other structures.

This paper explores current methods of LiDAR visualization within the GRASS project. A strong focus is placed on the creation and display of three-dimensional information, specifically on the role that three-dimensional modeled data is coming to play in GIS moving forward. Included in this research is a look at the current barriers to publishing three dimensional datasets such as this on the web, and a look at possible solutions and their subsequent challenges.

Event: 
FOSS4G2011
Speaker: 
Shane Grigsby

PostGIS 2.0, the new stuff

in FOSS4G, FOSS4G2011, GIS, Programming, PostGIS, PostgreSQL, OSGeo
PostGISPostgreSQLOSGeo

Leo Hsu and Regina Obe are PostGIS spatial database consultants and are showing the latest coolest stuff in PostGIS 2.0.

Event: 
FOSS4G2011
Speaker: 
Leo Hsu
Regina Obe