[GRASSLIST:1810] Re: i.ortho.photo on osx
Rich at GreenwoodMap.com
Tue Nov 18 22:11:46 EST 2003
At 10:04 AM 11/18/2003, you wrote:
>Richard, thanks for your response. If you had a similar experience, I am
>curious to know what happened. I am not sure that I have a feet to meters
>problem though. I am projecting from an XY location into an UTM projection.
>The dem elevation units are in meters. I projected my dem from a lat-long
>location, however the elevation units were meters in that too. If it isn't
>much trouble, I would be curious to see what your case is.
I am by no means an expert with i.ortho.photo. I have only done two
projects with it. But I did just revisit the project that gave me some
difficulty. Initially I was in UTM meters, with a DEM in meters and control
points in meters, but I was getting no joy. When I converted the DEM and
the control points to feet it worked correctly. The project fell by the
wayside, and I had forgotten about it until I read your post.
At the risk of sending you on a wild goose chase, you can test my premise
1. convert your DEM to feet with r.mapcalc dem_feet = dem * 3.2808
2. convert your CONTROL_POINTS file to feet. (save a copy of your
existing file then convert the elev field for each row to feet.
Everything else can stay in meters.
Please keep me posted if you choose to try this.
Richard W. Greenwood, PLS
Greenwood Mapping, Inc.
Rich <at> GreenwoodMap <dot> com
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