[GRASS-user] Raster and shape files miss aligned.

[Michael Barton]

Kirk,

My guess is that the projection information for one of the original files is incorrect. My bet is on the shapefile. You can test by importing a 3rd file where you know the projection info is good (e.g., something from USGS or an SRTM) and seeing which one matches and which one doesn't.


Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity 
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University

voice: 	480-965-6262 (SHESC), 480-727-9746 (CSDC)
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www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu



On Nov 9, 2011, at 10:00 AM, <grass-user-request at lists.osgeo.org> wrote:

> Date: Tue, 8 Nov 2011 12:38:24 -0600
> From: Kirk Wythers <kirk.wythers at gmail.com>
> Subject: [GRASS-user] Raster and shape files miss aligned. 
> To: "grass-user at lists.osgeo.org" <grass-user at lists.osgeo.org>
> Message-ID: <B15E5500-88C1-4B97-9685-25947F68BA47 at gmail.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> I have imported two files (one raster with r.in.gdal, and one shape file with v.in.ogr). Both file are in the same projection, but do not align properly. There is a North South shift that I can not explain. Any ideas what I might have missed in the import?
> 
> Thanks in advance
> 
> Here are the results from g.region on each file:
> 
> GRASS 6.4.1 (northcentralus_albersequalarea):~ > g.region -p vect=nw_prov212
> projection: 99 (Albers Equal Area)
> zone:       0
> datum:      nad83
> ellipsoid:  grs80
> north:      1322833.8573
> south:      647305.3646
> west:       6150.4319
> east:       1003361.9406
> nsres:      250.01054504
> ewres:      249.99035064
> rows:       2702
> cols:       3989
> cells:      10778278
> 
> GRASS 6.4.1 (northcentralus_albersequalarea):~ > g.region -p rast=mnwimifnfftgk7wt175v3_250m
> projection: 99 (Albers Equal Area)
> zone:       0
> datum:      nad83
> ellipsoid:  grs80
> north:      2960848
> south:      2087348
> west:       -122110
> east:       1141890
> nsres:      250
> ewres:      250
> rows:       3494
> cols:       5056
> cells:      17665664