[GRASS-user] patching images from different UTM zones (without shell script?)

GRASS GRASS user
1

Hello GRASS users-

I am trying to create a mosaic of LANDSAT taken of Eastern Hudson Bay area using GRASS 6.3.0. I have run into the problem though that some of these images are from different UTM zones (16, 17, and 18). Currently, I have been able to import images from the three UTM zones into 3 different locations. What I want to do is bring in the images from zones 16 and 18 (currently imported into different locations), and patch them with images from zone 17. I have tried re-projecting these images into the location for zone 17 using r.proj, but when I do this, it cuts off parts of the images which are not within zone 17.

I have looked at previous posts on the forum, and have found some advice (moving raster maps across UTM zone boundaries). I have never used shell script and am very new to GRASS, so the advice given in this response is somewhat complex for me. Are there any suggestions of how best to mosaic images from different zones without using shell script?

Thanks in advance for any help,

Renae Mackas

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2

You can try using the "-n" flag for r.proj to avoid region clipping or you can extend your region beyond the edges of the zone.

On 1-Apr-09, at 4:10 PM, Renae Mackas wrote:

Hello GRASS users-

I am trying to create a mosaic of LANDSAT taken of Eastern Hudson Bay area using GRASS 6.3.0. I have run into the problem though that some of these images are from different UTM zones (16, 17, and 18). Currently, I have been able to import images from the three UTM zones into 3 different locations. What I want to do is bring in the images from zones 16 and 18 (currently imported into different locations), and patch them with images from zone 17. I have tried re-projecting these images into the location for zone 17 using r.proj, but when I do this, it cuts off parts of the images which are not within zone 17.

I have looked at previous posts on the forum, and have found some advice (moving raster maps across UTM zone boundaries). I have never used shell script and am very new to GRASS, so the advice given in this response is somewhat complex for me. Are there any suggestions of how best to mosaic images from different zones without using shell script?

Thanks in advance for any help,

Renae Mackas

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3

Thanks-

I had originally been having trouble trying to extend the regions beyond the end of the zone because when I used g.region with -p flag, the nesw borders were given for each zone specifically, and I understood it that there were overlapping borders between zones 16,17, and 18. When I viewed the rasters in the map display however, I could just find the values of the appropriate extended borders by looking at the coordinates by vy the location of the cursor.

Thanks for the tips,

Renae

You can try using the "-n" flag for r.proj to avoid region clipping or
you can extend your region beyond the edges of the zone.

On 1-Apr-09, at 4:10 PM, Renae Mackas wrote:

Hello GRASS users-

I am trying to create a mosaic of LANDSAT taken of Eastern Hudson
Bay area using GRASS 6.3.0. I have run into the problem though that
some of these images are from different UTM zones (16, 17, and 18).
Currently, I have been able to import images from the three UTM
zones into 3 different locations. What I want to do is bring in the
images from zones 16 and 18 (currently imported into different
locations), and patch them with images from zone 17. I have tried
re-projecting these images into the location for zone 17 using
r.proj, but when I do this, it cuts off parts of the images which
are not within zone 17.

I have looked at previous posts on the forum, and have found some
advice (moving raster maps across UTM zone boundaries). I have
never used shell script and am very new to GRASS, so the advice
given in this response is somewhat complex for me. Are there any
suggestions of how best to mosaic images from different zones
without using shell script?

Thanks in advance for any help,

Renae Mackas

--
View this message in context: http://n2.nabble.com/patching-images-from-different-UTM-zones-(without-shell-script-)-tp2571892p2571892.html
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grass-user@lists.osgeo.org
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grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

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