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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: Import USGS DEM to GIRD in ArcGIS 8.1.2 |
| Date: |
06/19/2003 12:30:00 AM |
| From: |
Christopher Auricht |
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You can refer to
http://www.esri.com/news/arcuser/0700/files/gtopo30.pdf
However the following may help....
A GTOPO30 DEM will be downloaded as a tar file which can be unzipped using
Winzip 6.2 or higher. This tar file contains a number of files including a
*.dem and *.hdr. Both are required this method to be accomplished
successfully.
Notes:
If using winzip to uncompress make sure that the option (under the
options > configuration > Misc tabs) for 'TAR File Smart CR/LF conversion
is unchecked.
FOR ARCVIEW 3.x:
1. Change the *.dem to *.bil
2. In Arcview, add the *.bil as an image to a view
3. Convert the image to a grid (Menu options or Avenue)
4. Perform a map calculation on the resulting grid and use the following
code where in_grid is the grid created in step 3:
([in_grid] >= 32768).con([in_grid] - 65536, [in_grid])
5. In order to set the ocean areas to null, perform a map calculation and
use the following code where Map Calculation 1 is the grid created in step 4:
([Map Calculation 1] = -9999).setnull([Map Calculation 1])
The resulting grid will have elevation values in meters and map units in
decimal degrees
FOR ARC/INFO:
Convert the *.bil using the IMAGEGRID command and use the following GRID
statement (step 4 above):
out_grid = con(in_grid >= 32768, in_grid - 65536, in_grid)
The -9999 ocean values in the grid can then be set to NODATA with the
SETNULL function.
Related Documents: None
At 11:43 AM 19/06/2003 +0700, you wrote:
>Dear list,
>I download USGS DEM from http://edcdaac.usgs.gov/gtopo30/gtopo30.html to my
>computer.
>I use ArcGIS8.1.2 software and I have licence for Spacial Analyst.
>When I imported USGS DEM to GIRD it could not finish, end notice is:
>
>"E100N40.DEM is not a valid USGS DEM."
>
>
>E100N40 is file name.
>so How I do?
>Help me please.
>
>Thank you for your help.
>
>Hoa
>
>
>
>
>To unsubscribe, write to gislist-unsubscribe@geocomm.com
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At 11:43 AM 19/06/2003 +0700, Nguyen Huu Hoa wrote:
>Dear list,
>I download USGS DEM from http://edcdaac.usgs.gov/gtopo30/gtopo30.html to my
>computer.
>I use ArcGIS8.1.2 software and I have licence for Spacial Analyst.
>When I imported USGS DEM to GIRD it could not finish, end notice is:
>
>"E100N40.DEM is not a valid USGS DEM."
>
>
>E100N40 is file name.
>so How I do?
>Help me please.
>
>Thank you for your help.
>
>Hoa
>
>
>
>
>To unsubscribe, write to gislist-unsubscribe@geocomm.com
>________________________________________________________________________
>GeoCommunity GeoBids - less than $1 per day!
>Get Access to the latest GIS & Geospatial Industry RFPs and bids
>http://www.geobids.com
>
>Online Archive of GISList (and numerous others) available at:
>http://spatialnews.geocomm.com/community/lists/
>
>Setup a GeoCommunity Account and have access to
>the GISDataDepot DRG & DOQQ Catalog
>http://www.geocomm.com/login.php
To unsubscribe, write to gislist-unsubscribe@geocomm.com
________________________________________________________________________
GeoCommunity GeoBids - less than $1 per day!
Get Access to the latest GIS & Geospatial Industry RFPs and bids
http://www.geobids.com
Online Archive of GISList (and numerous others) available at:
http://spatialnews.geocomm.com/community/lists/
Setup a GeoCommunity Account and have access to
the GISDataDepot DRG & DOQQ Catalog
http://www.geocomm.com/login.php
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