[GRASS-user] Vector map too big for v.proj

GRASS GRASS user
1

I am having a problem reprojecting vector maps from lat/long to Irish National Grid. I have been using v.proj:

v.proj input=Lakes location=IrelandGeo output=Lakes1

and got:

pj_transform() failed: latitude or longitude exceeded limits
ERROR: Error in pj_do_transform

I am fairly sure this means the vector map is too big. The lat/long maps cover a good deal more than Ireland. Is their a way to clip what I don't need? Also, I have a good vector map of the ocean in lat/long, but I only need the part that surounds Ireland. When I go to clip it, does I have to draw a new bounding box around it and how do I tell it that every thing inside is blue except for the "islands"?

Thanks for any help.

Kurt D. Springs

2

On Tue, Mar 27, 2012 at 8:21 PM, Kurt Springs <ferret_bard@mac.com> wrote:

I am having a problem reprojecting vector maps from lat/long to Irish National Grid. I have been using v.proj:

v.proj input=Lakes location=IrelandGeo output=Lakes1

and got:

pj_transform() failed: latitude or longitude exceeded limits
ERROR: Error in pj_do_transform

I am fairly sure this means the vector map is too big. The lat/long maps cover a good deal more than Ireland. Is their a way to clip what I don't need? Also, I have a good vector map of the ocean in lat/long, but I only need the part that surounds Ireland. When I go to clip it, does I have to draw a new bounding box around it and how do I tell it that every thing inside is blue except for the "islands"?

In the latlong location, you could create a bounding box for Ireland,
then use v.select to select the lakes inside Ireland. For the ocean,
you could use v.overlay op=and with the bounding box and the ocean
vector. Then reproject as before.

Maybe a new option -r for v.proj would be useful, which restricts
vector reprojection to the current region and skips features outside
the current region?

Markus M

Thanks for any help.

Kurt D. Springs
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