Hello list!
I am still working on a new vector module for GRASS GIS.
It reads an existing vector set (stream network), calculates the strahler order for the lines and writes a new vector set.
I encountered two problems, though:
1) The output set should contain the attributes of the input set plus 2 new attributes which are calculated by my module. How do I append these new attribute columns to my output data?
I can successfully write a new table if the old vector had none but i fail to copy existing attributes AND add my calculated columns.
How would I accomplish that?
2) Even if the table is written, the output vector is not properly closed.
I use
Vect_close(&Out);
and get the following errors:
===
WARNING: Could not stat file '/vbg_m28/c716322/vector/xxxx/coor'
WARNING: Can't open topo file for write: /vbg_m28/c716322/vector/xxxx/topo
WARNING: Can't open cidx file for write: /vbg_m28/c716322/vector/xxxx/cidx
WARNING: Could not stat file '/vbg_m28/c716322/vector/xxxx/coor'
mkdir: cannot create directory `/vbg_m28/c716322/vector': No such file or directory
ERROR: can't make mapset element vector/xxxx (/vbg_m28/c716322/vector)
A vector set 'xxxx' is actually created but
v.info xxxx
yields
ERROR: Cannot open old vector xxxx@c716322 on level 2
Any ideas how to solve my problems?
Thanks for your help,
Flo.
--
Florian Kindl
Institute of Geography
University of Innsbruck
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