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Extract eleavtion value from ARSTER GDEM

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#1
uma

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Dear friends,

I was trying to extract elevation value from a ASTER GDEM data using Arcmap 9.3, data is in .tiff format, please any one guide me in this problem

Edited by uma, 04 October 2011 - 04:29 AM.


#2
frax

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When you bring it up in ArcMap, what do you get then? You may need to recalculate for negative figures in the data - if you can see that data are up in the 60000 range.
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#3
Sab

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you don't need to have a full blown GIS package to do that:
http://gis-lab.info/...es-rasters.html

Make sure you use google translator!

#4
uma

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you don't need to have a full blown GIS package to do that:
http://gis-lab.info/...es-rasters.html

Make sure you use google translator!


Hi Sab, thanks for ur suggestion, but
I could not able to install, showing some error, and
would like to use GIS tools for this problem

#5
Sab

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You can install QGIS (Free and Open Source) and Point Sampling Plugin

#6
Hans van der Maarel

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You can install QGIS (Free and Open Source) and Point Sampling Plugin


Could you go into a bit more detail on how to do that?
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#7
Sab

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You can install QGIS (Free and Open Source) and Point Sampling Plugin


Could you go into a bit more detail on how to do that?


Here is a good wiki:
http://pvanb.wordpre...ations-in-qgis/

#8
Robert2009

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Sent the .TIFF file to GRID file and then save it as integer so it can populate the field column. Then do the extract values you wanted.

I hope this helps.

#9
frax

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If you do have ArcGIS (and want to use that) - learn how to do it there instead of trying other pieces of software! (unless you are hampered by license restriction or time!)
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#10
Hans van der Maarel

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I've split off the posts that weren't directly related to the original question and moved them to this topic
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#11
uma

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I've split off the posts that weren't directly related to the original question and moved them to this topic


Very thank u for ur reply,

i could able to extract values which i want,

now the thing is i have a Shapefile which has 13706344 points, i wanna to export that .shp into dbf file,
but dbf file can store only 65535 rows, so now i m stuck their,

so pls help me

#12
Hans van der Maarel

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now the thing is i have a Shapefile which has 13706344 points, i wanna to export that .shp into dbf file,
but dbf file can store only 65535 rows, so now i m stuck their,

so pls help me


Are you sure DBF can only store 65535 rows? I have shapefiles (which include a DBF for the attributes) with way more than that number of features.

Keep in mind some database/spreadsheet software that you can use to view DBF files can't handle more than 65535 rows.
Hans van der Maarel - Cartotalk Editor
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#13
frax

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I think the 65535 limit is an excel thing - do you want/need to use excel to work with the data? You probably want MS Access or equivalent instead...
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