[GRASS-user] Newbie question on g.region

[Trevor Wiens]

On Thu, 08 Jun 2006 18:49:42 -0700
gary <lists at lazygranch.com> wrote:

> For some reason, the moderator isn't approving this message, but I'll 
> post it again assuming a computer glitch.
> 
> Yes, I know it is frustrating to deal with newbies, but we all have to 
> start somewhere.

No problem.

> 
> My ultimate goal for GRASS is to do viewshed analysis with r.los. I have 
> downloaded NED files from the USGS seamless website. I have also managed 
> to convert the .adf file to geotiff using gdal_translate.
> 
> My problem concerns starting up GRASS. When I try to run r.in.gdal, I 
> get an error message regarding the default region is not set. I gather 
> I'm not initializing GRASS properly.
> 
> I'm using my own PC, so I can run as root to avoid directory permission 
> issues.
> 

This shouldn't be necessary except for your install of GRASS.

> I have the "Grass 6 in a nutshell handy" if you need to reference it.
> 

Lets cover the basics. I assume that you know the projection of the
image you want to use. Further, you've created a location which has
the same projection parameters? Now if you don't have anything in that
location yet and you are having problems, I would just delete it from
an xterm and start over. In the Grass 6 in a nutshell there is a
section on creating locations. I would review it and try again. If it
is still odd I would then use g.region -p and g.proj -p and see what
you get and how that matches or doesn't match with your file.

When you are setting up a region, you don't need to worry about extents
as their is an option in r.in.gdal to expand the extents of the current
region to match the source image.

HTH.

T
-- 
Trevor Wiens 
twiens at interbaun.com

The significant problems that we face cannot be solved at the same 
level of thinking we were at when we created them. 
(Albert Einstein)