Common Tasks: Difference between revisions
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== Raster operations == | == Raster operations == | ||
=== Creation === | |||
* slope, aspect and surface parameters | |||
** r.slope.aspect | |||
** r.param.scale | |||
* Create a shaded relief map | * Create a shaded relief map | ||
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* drape semi-transparent land use map over shaded relief map | * drape semi-transparent land use map over shaded relief map | ||
** d.his | ** d.his | ||
=== Analysis === | |||
* cost surface analysis | |||
** r.cost | |||
** r.drain (fun examples) | |||
** r.walk (fun examples) [how output is different] | |||
== Vector operations == | == Vector operations == |
Revision as of 07:32, 13 December 2006
Mini-tutorials showcasing some common GIS taks
Import/Export and Display
- Import and display SRTM elevation data
- r.in.srtm
- GRASS Newsletter, 3, June 2005.
- You can also get the SRTM data with a convenient web interface at http://srtm.csi.cgiar.org/. These come in 5 degree blocks and can be downloaded either as geotiff or ascii files.
- Import and display VMap0 Digital Chart of the World
- v.in.ogr
- GRASS Newsletter, 3, June 2005.
- If your region crosses the boundaries of a VMap0 block you can use the v.append command, available in the Grass addons section of this wiki, to combine vectors across the edges. It can take quite a while to complete.
- Import and display ETOPO2 world elevation and bathymetry dataset
General Import / Export
- Raster import and export with r.in.gdal / r.out.gdal
-
- r.in.gdal misc. tips
- r.out.gdal data types, creation options, new flags
- Vector import and export with v.in.org / v.out.ogr
-
- v.in.ogr misc. tips, shapefile gotchas
- v.out.ogr data types, dsn, new flags
GIS Tasks
- Georectify a scanned raster image
- r.in.gdal into XY location
- GUI georectifier
- i.points + i.rectify (alternate method)
- Create a DEM from contour lines and trig points
- r.surf.contour
- Create a DEM from x,y,z point data
- v.surf.rst
- v.surf.idw
- v.surf.bspline
- r.surf.nnbathy
- Create vector contour lines from a raster DEM
- r.contour
3D Visualization
- Use NVIZ to render a 3D image
nviz elevation.dem
- Use NVIZ to make a fly through movie
- see nviz keyframe animation panel help page
- Encoding Movies
- Use Paraview to render a 3D image
- r.out.vtk, v.out.vtk
Raster operations
Creation
- slope, aspect and surface parameters
- r.slope.aspect
- r.param.scale
- Create a shaded relief map
- r.shaded relief
- drape semi-transparent land use map over shaded relief map
- d.his
Analysis
- cost surface analysis
- r.cost
- r.drain (fun examples)
- r.walk (fun examples) [how output is different]
Vector operations
- Disolve interior lines
- v.dissolve
Hardcopy and Presention Graphics Creation
- Create a high quality hardcopy plot
- Creating PostScript with ps.map
- export to GMT