Part of my research presently is using ArcGIS 10.0 in Hypsometric analysis. But I need to know how the relative area (a/A) and relative elevation (h/H) are calculated so as to obtain hypsometric curve.
Please answer in regards to
where a = area above a particular contour, (how this is calculated)
A = total area of the sub watershed above the outlet
Also, I would like to know does h represent minimum elevation of a sub-basin and H the maximum basin or sub-basin elevation.
I will be glad if someone can give me detail explanation on how to do this using ArcGIS or any other methods.
You can check the code for module 'Hypsometry' from SAGA GIS (https://fossies.org/dox/saga_2.1.2_src/Hypsometry_8cpp_source.html) or the 'hipsometry' plugin for QGIS (https://github.com/alexbruy/hypsometry). In the first case you have also two references, which can help you understand how the hypsometric curve was calculated.
You can use Microdem software (free downloadable from web) that automatically calculate hypsometriccurve from a DEM
There is an excellent freeware script for ArcGIS called Calhypso by the Unersity of Granada and UGR-CSIC (Spain) that does an easy and automated hypsometric analysis and can compute multiple hypsometric curves for basins.
You can find the softare here
http://www.iamg.org/documents/oldftp/VOL35/v35-06-16.zip
I have found Calhypso to be very useful, so I second that suggestion.
I have tried to install Calhypso extension to my ArcGIS but has not been working for me. Please what do I do to make it work or how should I go about its installation and make it work? Thank you all for your great contribution and response.
You can check the answers in this previous question https://www.researchgate.net/post/Hypsometric_Integral_Curve for a solution to the ArcGIS 10 problem.
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