Difference between revisions of "GRASS FAQ"

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* How to create a buffer around polygons using v.buffer? - [[Vector Buffer]]
 
* How to create a buffer around polygons using v.buffer? - [[Vector Buffer]]
 
* What are LOCATIONs and MAPSETs? - [[Location and Mapsets]]
 
* What are LOCATIONs and MAPSETs? - [[Location and Mapsets]]
* Starting GRASS -  [[Starting GRASSS]]
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* Starting GRASS -  [[Starting GRASS]]
 
* How to see if you can use GRASS for anything at all - [[Grass Assess]]
 
* How to see if you can use GRASS for anything at all - [[Grass Assess]]
 
* How to see if you can use GRASS for anything at all - [[Grass Assess]]
 
* How to see if you can use GRASS for anything at all - [[Grass Assess]]

Revision as of 23:56, 18 May 2006

This pages contains a growing list of Frequently Asked Questions (FAQs). Feel free to add text, "Edit" button for that.

Usage

Data

  • Can I map data from an arbitrary database model to work with GRASS without having to restructure or create a new database?

Technical

Installation

GRASS 6 compilation problems

  • Can't find a library even after I've built and installed it: Make sure that /usr/local/lib (or where you installed it) is listed in your /etc/ld.so.conf file and (as root) run /sbin/ldconfig.
  • grass 5.7 compilation problems: - GRASS57 Compilation
  • grass 5.3, 5.4 compilation problems: - GRASS53 Compilation
  • How do I install grass in windows 2000: - WinGRASS Installation

GRASS and Cygwin

  • How do I find the Cygwin packages to install? - Cygwin Packages
  • Can't find pq.dll: Make sure you installed the PostgreSQL package in the Cygwin [installer].
  • Can't find pq.dll : try copy cygpq.dll to pq.dll

Errors

  • In a Latitude-Longitude location I'm getting the error Illegal latitude for North when importing an unprojected raster image: Unprojected images are given a resolution of 1 pixel per line, and so any image with a height of more than 90 pixels will try and write data to an impossible latitude.

Solution: import the image into a simple XY location and georeference the image with either r.region (if bounds are simple and known) or i.points and i.rectify. An automated alternative to r.region is to create a "World File" to be used by r.in.gdal. See the GeoTIFF format help page at [[1]].