[GRASSLIST:6449] How to remove nested vector islands?

Patton, Eric epatton at nrcan.gc.ca
Wed Apr 13 12:50:18 EDT 2005

I have a series of vested vector polygons, progressing from largest to
smallest, they are:


1) Polygon of marshland;   2) Polygon of small lake within larger marshland
polygon;   3) Polygon of very small islands within lake


All three polygon boundaries are currently attributed as 'marshland', so I
need a way of assigning new attributes to the vector boundary and area for a
large number of polygons in my mapset. Do the boundary portion and area
potion of a Grass 6.0 vector require separate attribution? And once the lake
polygons and island polygons have had their attributes changed from
marshland, how can I clip out the lake polygon from the larger marshland
while maintaining the island polygons?


Sorry if my questions seem muddled, I'm relatively new to using the 6.0
vector programs. I may not be asking the right kind of questions I need to.





~ Eric. 




Eric Patton


Technologist, Geo-Spatial Data Services

Geological Survey of Canada (Atlantic)

Natural Resources Canada

Bedford Institute of Oceanography

Dartmouth, Nova Scotia, Canada B2Y 4A2


Postal address: P.O. Box 1006

Courier address: 1 Challenger Drive


Telephone: (902)426-7732

Facsimile:  (902)426-4104

E-mail:        <mailto:epatton at NRCan.gc.ca> epatton at NRCan.gc.ca



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