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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] GeoTIFF |
| Date: |
01/12/2007 11:20:00 AM |
| From: |
Frank Warmerdam |
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Rell Fowler @PD wrote:
> Dear GIS List,
>
> I have a set of raster images that I am told are GeoTIFF's, however they
> do not show up correctly when I load them into ArcMap or ArcCatalogue.
> The question I have is can ArcMap read and use a GeoTIFF (the ESRI
> documentation says it can read the "tags")? And if so, then what
> problem am I having since I can not bring my images in? Also, just out
> of curiosity, what is the difference in the naming conventions, if any,
> between a TIF image with a world file and a GeoTIFF? Any help would be
> greatly appreciated.
Rell,
Without any details about the TIFF files it is hard to comment on what
might be wrong. If you wish to followup this issue, I would suggest
running the "tiffinfo.exe" and "listgeo.exe" utilities against the file
and capturing the results for list members to see. These utilities
can be used from the FWTools Shell from the free FWTools suite.
http://fwtools.maptools.org/
There is a variety of information on the geotiff tags used to extend
the TIFF format with georeferencing and coordinate system information
at:
http://geotiff.maptools.org/
Note a world file does not contain coordinate system information, only
the transformation to map from pixel/line to projected coordinates.
GeoTIFF goes beyond this to allow the projected (or geographic) coordinate
system to be described.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | President OSGeo, http://osgeo.org
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