Hello list:
I have an intuitive idea about an operation with vector polygons but I
don't know how to accomplish (if even can be done). I will appreciate
your comments and suggestions:
I have a vector layer consisting polygons of several classes. What I
would like to calculate for each polygon (without regard of the class it
belongs to) is the % of its perimeter that shares with adjacent polygons
of a given class.
Best regards and thank you very much.
Eduardo Corbelle
On 22/04/09 18:47, Eduardo Corbelle wrote:
Hello list:
I have an intuitive idea about an operation with vector polygons but I
don't know how to accomplish (if even can be done). I will appreciate
your comments and suggestions:I have a vector layer consisting polygons of several classes. What I
would like to calculate for each polygon (without regard of the class it
belongs to) is the % of its perimeter that shares with adjacent polygons
of a given class.
Using v.to.db several times with option set respectively to length and sides, followed by some SQL aggregation functions should do the trick (use a real SQL database backend, i.e. SQLite, PostgreSQL or MySQL).
Moritz