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Results tagged with open-source-gis
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user 2581
Software for which the original source code is made freely available and may be redistributed with or without modification.
4
votes
Why choose open source software for remote sensing research?
If you want to use a GIS and you are not in an academic institution or in a company witch have special conditions or money to pay for licenses, what solutions ?
pirated software ?
FOSS ?
For me, …
1
vote
Accepted
FAHP/AHP for GIS in free software?
Look at GRASS GIS, MCDA in GRASS, and the addon module:
r.mcda.ahp - generate a raster map classified with analytic hierarchy process (AHP) for GRASS 7
r.mcda.ahp - idem for for GRASS 6
The modul …
- 55.4k
1
vote
Delineate polygonal catchment areas from a raster using open-source GIS
You can use
GRASS GIS (an GRASS GIS from QGIS): Vector aggregate values
SAGA GIS from QGIS: Some hydrological analysis
PostGIS from QGIS: Creating Catchment Areas with pgRouting and QGIS (Underdar …
- 55.4k
1
vote
Open source tool to convert a DEM to a 3D model
nviz is not a standalone application, it is part of GRASS GIS, for 3D visualization and animation. If you want to export rasters, you need GRASS GIS (or GRASS in QGIS). You can export DEMs in various …
- 55.4k
16
votes
Accepted
3D visualisation with open source GIS software
As a geologist, my solution is GRASS GIS with nviz or Python from the Python Console with modules that allow the 3D representation (I never use commercial softwares and Globe or Horao, witch display …
- 55.4k
4
votes
Accepted
How to create line/polygon shapefiles from geojson using gdal in Python?
For creating an OGR geometry from GeoJSON, see Python GDAL/OGR Cookbook: Create Geometry from GeoJSON
point = """{"type":"Point","coordinates":[108420.33,753808.59]}"""
line = """{ "type": "LineStrin …
- 55.4k
6
votes
Counting sides or edges of polygon using open source GIS?
With Python and Fiona, Polygons and MutiPolygons (multi-parts) are different geometries:
1) multi-parts geometries
import fiona
shape = fiona.open("polygons.shp")
# shapefile schema
print c.sch …
- 55.4k
10
votes
What is OSGeo4W?
Look at the OSGeo: Open Source Geospatial Foundation site. You will see that they support Desktop applications (GRASS GIS, QGIS,...), Web Mapping projects (OpenLayers, GeoServer,MapServer ...), Geospa …
- 55.4k
7
votes
Accepted
GRASS Geoprocessing in Python Script
You cannot use a shapefile directly. You must first import it as a Grass layer in your mapset "Martin". A name beginning with a number (1.shp) is not allowed in Grass
Also, in order to use GRASS funct …
- 55.4k
1
vote
Open source solution to convert terrain data to collada?
You can examine the answers to the Bjørn Sandvik question to find the best open source tool to create a Triangulated Irregular Network (TIN) from a Digital Elevation Model (DEM).
1) With SAGA GIS …
- 55.4k
-1
votes
DEM generation from ASTER L1B imagery using FOSS
GRASS GIS, look at r.in.aster:
r.in.aster rectifies, georeferences, and imports Terra-ASTER imagery to current location using gdalwarp, hdf 4, and r.in.gdal, using projection parameters from g.pro …
- 55.4k
5
votes
Calculating elevation profile along line from a DEM?
You can go much further by combining DEM and raster colors, using GRASS with R. See:
Raster profile along arbitrary line segments, or
http://www.portailsig.org/content/grass-gis-et-r-superposition-de …
- 55.4k
8
votes
Accepted
Standard Deviational Ellipse with Open Source Python (GDAL/OGR etc)
The Standard Deviational Ellipse from ArcGIS is not the only solution. In the geospatial world, there are two major algorithms (Yuill and CrimeStat III) and many intermediate solutions (QGIS: des El …
- 55.4k