[GRASSLIST:1408] Sites to Poly

GRASS GRASS user
1

Hello,

I am trying to convert a site with 4 locations into a polyline and I am stumped. I import my site data with s.in.ascii, then I convert it to vector with s.to.vect and I am trying to build a polyline, I have tried v.build.polylines with no success. It creates lines from a location to the same location. It seems as if I need a v.point.to.line module or something.

Here is what my sites look like:

   523354.5000 3651123.50 SW
   523321.5000 3664980.75 NW
   534982.3125 3665015.50 NE
   535031.8125 3651158.25 SE

I simply want to create a polyline or line using these four segments. Any ideas on how to accompish this?

example:
   NW----------NE
    | |
   SW----------SE

Thanks,
--
Jeshua Lacock
Cartographer/Owner
http://SierraMaps.com
http://3dTopoMaps.com
Telephone: (760) 935-4481

2

Jeshua Lacock wrote:

Hello,

I am trying to convert a site with 4 locations into a polyline and I
am stumped. I import my site data with s.in.ascii, then I convert it
to vector with s.to.vect and I am trying to build a polyline, I have
tried v.build.polylines with no success. It creates lines from a
location to the same location. It seems as if I need a
v.point.to.line module or something.

Here is what my sites look like:

   523354.5000 3651123.50 SW
   523321.5000 3664980.75 NW
   534982.3125 3665015.50 NE
   535031.8125 3651158.25 SE

v.build.polylines is intended for connecting line segments to polylines.

You need to convert your sites ascii file to vector ascii file and use
v.in.ascii. Vector ascii example:
ORGANIZATION:
DIGIT DATE: Wed Jan 24 09:09:24
DIGIT NAME:
MAP NAME: Output from v.patch
MAP DATE:
MAP SCALE: 2400
OTHER INFO:
ZONE: 0
WEST EDGE: -735066.7082
EAST EDGE: 0
SOUTH EDGE: -1044921.63
NORTH EDGE: 0
MAP THRESH: 1.8288
VERTI:
L 3
-1042867.127 -734079.284
-1042861.042 -734076.804
-1042844.068 -734071.973
L 2
-1042844.068 -734071.973
-1042861.042 -734076.804

!!! coordinates are in Y X order.
Read grass manual for detail info about vector ascii format.

Radim

I simply want to create a polyline or line using these four segments.
Any ideas on how to accompish this?

example:
   NW----------NE
    | |
    | |
   SW----------SE

Thanks,
--
Jeshua Lacock
Cartographer/Owner
http://SierraMaps.com
http://3dTopoMaps.com
Telephone: (760) 935-4481