Common Tasks: Difference between revisions

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* Create a DEM from contour lines and trig points
* Create a DEM from contour lines and trig points
** {{cmd|r.surf.contour}}
** {{cmd|r.surf.contour}} (see the [[Contour lines to DEM]] wiki page)


* Create a DEM from x,y,z point data
* Create a DEM from x,y,z point data

Revision as of 17:16, 27 February 2010

Mini-tutorials showcasing some common GIS tasks

Import/Export and Display

  • Import and display SRTM elevation data
r.in.srtm
  • 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
r.in.bin

General Import / Export

  • Raster import and export with r.in.gdal / r.out.gdal
  • Vector import and export with v.in.ogr / v.out.ogr

GIS Tasks

  • Map (re-)projection
    • r.proj and v.proj (snippets from manual pages)
    • gdal_warp as an alternative for large, complex (re-)projection tasks
    • ogr2ogr as an alternative to v.proj
  • Create vector contour lines from a raster DEM

3D Visualization

  • Use NVIZ to render a 3D image
nviz elevation.dem

Raster operations

Creation

  • drape semi-transparent land use map over shaded relief map

Analysis

  • cost surface analysis

Vector operations

Hardcopy and Presention Graphics Creation

  • Create a high quality hardcopy plot
    • Creating PostScript with ps.map
    • export to GMT