Dissolve polygons: Difference between revisions
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'''Q:''' How to dissolve vector polygons (or remove tile boundaries of adjacent maps) | '''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: | '''A:''' Dissolving of areas is done with {{cmd|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 first remove duplicated boundaries: | ||
Remove duplicated tile boundaries: | Remove duplicated tile boundaries: | ||
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 | ||
Dissolve: | |||
Dissolve: | |||
v.dissolve input=clc2000_clean output=clc2000_final | v.dissolve input=clc2000_clean output=clc2000_final | ||
[[Category: FAQ]] | [[Category: FAQ]] | ||
[[Category: Vector]] | |||
Revision as of 07:56, 10 April 2013
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 first remove duplicated boundaries:
Remove duplicated tile boundaries:
v.clean clc2000_patched out=clc2000_clean tool=snap,break,rmdupl thresh=.01
Dissolve:
v.dissolve input=clc2000_clean output=clc2000_final