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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | RE: GISList: GeoTIFF Headers |
| Date: |
04/11/2003 01:05:00 PM |
| From: |
Hobbs, Jeff |
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Andy,
You might want to look into the following DOS commands: geotifcp AND
listgeo. They are both free downloads. I can provide a copy if you can't
find them online (I found mine using Google). Anyhow - geotifcp will allow
you to copy TIFF with updated GeoTIFF metadata. That would allow you to
batch update the GeoTIFF headers. It will typically pull the header
information from the TFW. However you can also use the listgeo command to
list all of the GeoTIFF metadata into a text file. Then you can modify that
text file and then read it back into the GeoTIFF using geotifcp.
Let me know if you need help with these commands (assuming they will help
you). There are also FREE GeoTIFF tools available from the Intergraph web
site http://www.ingr.com/gis/support/Tools.asp You will see references to
ESRI all through this site. Additionally, there are a set of tools named
ImageStation Raster Utilities - these might help you tremendously. They are
well worth the download if you are going to be spending ANY time
administering GeoTIFFs. Additionally - in this toolkit is included a
application that will BATCH create pyramids for each of your GeoTIFFs. That
way you won't need to wait for ArcCatalog to create the pyramid for you.
This is very nice if you have several thousand images (like we have).
Anyhow, hope this information helps. Let me know how it goes.
Jeff Hobbs
City of San Jose
-----Original Message-----
From: northms@telus.net [mailto:northms@telus.net]
Sent: Friday, April 11, 2003 10:00
To: Andy Morris: Toby L Welborn: gislist@geocomm.com
Subject: Re: GISList: GeoTIFF Headers
Andy,
Sorry to say, I can't shed any light on the problem you are having... I am
still kinda confused about how the AUX file works. I hope someone else can
enlighten us.
We don't have ArcInfo 8, just ArcView 8. So the CONVERTIMAGE command Toby
mentions isn't available. If I need to override the GeoTIFF header
information, I open the TIFF in an image editing program (PaintShopPro) and
resave it under a different name: this seems to eliminate the header. Then
I
create a TFW, as well as defining the projection via ArcCatalog. Not very
efficient for multiple images, but I haven't found another approach without
requiring more software.
A related annoyance: ArcView 3.x would read coordinate information from an
image catalog DBF table, overriding GeoTIFF and TFW information. You can
use
the same image catalog in ArcMap 8.x, but it seems to read the coordinate
information from each image's GeoTIFF header or TFW, not from the catalog
table.
sarah
Quoting Toby L Welborn <tlwelbor@usgs.gov>:
>
> We had a similar problem. We, I say we because there was a whole team
> working, found that a GeoTIFF saved space over a raster format or a
regular
> TIFF if it was a small image. We also found that doing a simple
> CONVERTIMAGE from the command line fixed any projection issues between
> ArcVIew 3.X and ArcGIS 8.X and did not create any size issues.
>
> Attached are two links to ESRI Help dealing with image "conversion"
>
> http://support.esri.com/search/KbDocument.asp?dbid=16192
>
> http://support.esri.com/search/KbDocument.asp?id=22490
>
> Go
>
> Toby Welborn
> tlwelbor@usgs.gov
>
>
> |---------+---------------------------->
> | | "Andy Morris" |
> | | <Andy.Morris@Merr|
> | | ick.com> |
> | | |
> | | 04/11/2003 08:39 |
> | | AM |
> | | |
> |---------+---------------------------->
>
>
>---------------------------------------------------------------------------
--
-------------------------------------|
> |
> |
> | To: <northms@telus.net>
> |
> | cc: <gislist@geocomm.com>
> |
> | Subject: GISList: GeoTIFF Headers
> |
>
>
>---------------------------------------------------------------------------
--
-------------------------------------|
>
>
>
>
> Sarah,
> I read the ESRI support pages you listed and they were informative, but I
> would like to dig a little deeper and see if you have any further insight
> into GeoTIFFs. The second document listed states that "ArcGIS does not
> provide a mechanism to alter the GeoTIFF tags that control the internal
> georeferencing of TIFF images." However, when I define spatial reference
> information for a GeoTIFF a temporary file is created that grows in size
> until it matches the original GeoTIFF image size then it is
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