Dissolve polygons: Difference between revisions
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(Category: FAQ) |
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v.clean clc2000_patched out=clc2000_clean tool=snap,break,rmdupl thresh=.01 | v.clean clc2000_patched out=clc2000_clean tool=snap,break,rmdupl thresh=.01 | ||
No longer needed in GRASS > Version 6.4:<strike> | |||
Reclass based on desired column: | Reclass based on desired column: | ||
v.reclass clc2000_clean out=clc2000_recl col=CODE_00 | v.reclass clc2000_clean out=clc2000_recl col=CODE_00 | ||
</strike> | |||
Dissolve: | Dissolve:<strike> | ||
v.dissolve input=clc2000_recl output=clc2000_final | v.dissolve input=clc2000_recl output=clc2000_final | ||
</strike> | |||
v.dissolve input=clc2000_clean output=clc2000_final | |||
[[Category: FAQ]] | [[Category: FAQ]] | ||
Revision as of 15:24, 24 July 2009
Q: How to dissolve vector polygons (or remove tile boundaries of adjacent maps)
A: Dissolving of areas is done with v.dissolve (v.extract -d). If tile boundaries of adjacent maps (e.g. CORINE Landcover SHAPE files) have to be removed, an extra step is required to remove duplicated boundaries:
Remove duplicated tile boundaries:
v.clean clc2000_patched out=clc2000_clean tool=snap,break,rmdupl thresh=.01
No longer needed in GRASS > Version 6.4:
Reclass based on desired column:
v.reclass clc2000_clean out=clc2000_recl col=CODE_00
Dissolve:
v.dissolve input=clc2000_recl output=clc2000_final
v.dissolve input=clc2000_clean output=clc2000_final