hello,
I am new to GRASS 5.0,
any body will help me .....
in installing Grass in linus and what r the other requirements we need to install other thatnGrass 5.0 .
How to work with Grass ?
What r the steps to take first first time users ?
Give me the web urls those will help me in this regard?
To compile what we need ?
bye
On Thu, 28 Nov 2002 Radim Blazek wrote :
On Thursday 28 November 2002 03:29 am, Eric G. Miller wrote:
> * Fixes interior boundary winding (shapefiles have exteriors clockwise,
> interiors counterclockwise) for areas with holes. AFAIK,
> Vect_get_area_points and Vect_get_isle_points always return clockwise
> polygons. So isle point orders are reversed. Isles will come up
> twice, once as interior and once as exterior. (If my understanding of
> these API's is incorrect, someone please let me know.)I thought that direction for areas/isles is the same in grass as in shapefile
and Vect_get_isle_points returns counterclockwise vertices:struct P_isle {
plus_t *lines; /* Boundary Lines (Negative means N2 to N1
counter-clockwise) */
}int Vect_get_isle_points () {
if (Isle->lines[i] < 0) {
start = Points.n_points - 1; inc = -1 ; end = 1;
} else {
end = Points.n_points - 2; inc = 1 ; start = 0;
}
}It is strange if shapefiles with reverted order of isles are correct.
Did you check it in ArcExplorer or other ESRI SW (AE runs on Linux)?Radim
_______________________________________________
grass5 mailing list
grass5@grass.itc.it
http://grass.itc.it/mailman/listinfo/grass5