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Jake
Osiris (Active Member)
Joined: 14 Jun 2005
Posts: 18
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 Posted: Mon May 08, 2006 2:36 pm Post subject: Hypsometric Integral |
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Trent,
Are you aware of any tool that can calculate the hypsometric integral for a given topographic grid in ArcMap 9? I would like to be able to plot normalised area vs. normalised elevation, and determine the hypsometric value. in the published literature I have found mention of a tool called ArcEvolve, but I have not been able to find the application anywhere. Many people have used this approach to studying landform evolution, but I am having trouble determining a way to conduct this study. Any help would be great.
thanks for your time,
Jake |
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thare
GIS Support Team
Joined: 22 Mar 2004
Posts: 657
Location: USGS Astrogeology Research Program, Flagstaff, AZ
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| Posted: Mon May 08, 2006 6:38 pm Post subject: |
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I have seen several methods to do it using AML (in ArcInfo Workstation). It also appears Corey Fortezzo, who is interning here, has also used this method in GIS (using ArcView 3.x). I'll have him weigh in. I did a search on the ESRI forums and hit a few methods.
The ArcEvolve plug-in for ArcView 3.x looks like a great extension but Boggs's email address bounced. To bad he didn't uploaded it anywhere.
1.) http://forums.esri.com/Thread.asp?c=93&f=995&t=115419#330972
BTW, MOLA is already 16bit (INT) so there is no issues with data loss.
2.) http://forums.esri.com/Thread.asp?c=93&f=995&t=170417#502441
In one of these it states the freeware MicroDEM can do H.I. also. I think you would just have to export MOLA to a Geotiff. Not sure if it needs to be Sinu or not though. Not sure how MicroDEM would react to planetary data but you can probably just fool like other applications.
Found a cute powerpoint on H.I. http://www.geoinformatics.upol.cz/pracovnici/Michal/Bil.ppt#267,6,Slide 6
Let me know if this gets you going.
Trent |
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kainus
Horus (New Member)
Joined: 19 May 2006
Posts: 4
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| Posted: Mon May 22, 2006 11:35 am Post subject: |
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Jake,
John Grant and I used the hypsometric integrals (HI) to try to quantitatively determine the dominant process of valley development in Margaritifer Terra. We think that on Mars that valleys are controlled by existing topography and that hypsometry didn’t give us all the answers.
We used two processes: gridded data and a point coverage database to construct the hypsometric curves and then used Access and Excel to calculate the integrals; the alternative is to use the programs (AML and Fortran 77) created by Luo that can spit out the HI with the use of gridded basins.
Luo’s article is available online from the Computers & Geosciences Elsevier journal: Luo, W. (1998), Hypsometric analysis with a geographic information system, Computers & Geosciences, v. 24:8, 815-821.
Luo’s code is available from: http://www.iamg.org/CGEditor/index.htm
If you want it, I can send you a list of steps to calculate them manually using GIS. I recommend using Luo’s process just because it’s automated.
If you cannot access the program, contact me and I’ll be able to get you a DOS copy of the programs
I hope this helps, let me know if you need more information.
Corey |
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