The readily available DEM such as Bhuvan DEM, ASTER DEM have been used for different purposes. But,I haven't got any literature where the detail methodology of bank angle measurement from DEM is given. I need to calculate river bank angles at different reaches of river.If some one helps me out I will be very grateful. Thank you!
In my opinion DEM are in general a good complementary data source to field measurements (especially if the study site is not easily accessible) for any kind of 3D-surface investigation. But as Valentin mentioned before, in your case surface changes can be strong and fast. Hence appropriate DEM for your application need to fulfill certain requirements. High resolution DEM, e.g. derived from highly coherent TanDEM-X SAR data and the technique of SAR-Interferometry might be suitable for your purpose. If you subtract two of such DEM you can show the change of the river bank angles during the time span of the two acquisitions. The minimum time span of two TanDEM-X-DEM is 11 days. Unfortunately TanDEM-X-DEM need to be processed from not freely available SAR data. Therefore commercial data and expertise in SAR processing are needed.
Nonetheless you can try to calculate the angles from an already provided DEM (such as ASTER). This might be done with GIS software like ArcGIS or Q-GIS, where algorithms for surface slope calculation are already implemented.
It is depend from type of river bank. If it is mountain river which cross the hard rocks, the river bank angle in general relatively stable. Hoever in the most other case, river bank angle change very intensivly because of river bank erosion or some exogenic processes on river bank like surface landslide, scree and so on. So I can't recommend you to use DEM. You need to make field measurements
In my opinion DEM are in general a good complementary data source to field measurements (especially if the study site is not easily accessible) for any kind of 3D-surface investigation. But as Valentin mentioned before, in your case surface changes can be strong and fast. Hence appropriate DEM for your application need to fulfill certain requirements. High resolution DEM, e.g. derived from highly coherent TanDEM-X SAR data and the technique of SAR-Interferometry might be suitable for your purpose. If you subtract two of such DEM you can show the change of the river bank angles during the time span of the two acquisitions. The minimum time span of two TanDEM-X-DEM is 11 days. Unfortunately TanDEM-X-DEM need to be processed from not freely available SAR data. Therefore commercial data and expertise in SAR processing are needed.
Nonetheless you can try to calculate the angles from an already provided DEM (such as ASTER). This might be done with GIS software like ArcGIS or Q-GIS, where algorithms for surface slope calculation are already implemented.
Pankaj Roy, I say contact Dr. Richard Marston at Kansas State University!
Thank you every one Valentin Nikolaevich Golosov and Peter Friedl for your valuable comments and suggestions.
Thank you very much Sir, Stanley Turner Paxton for your valuable suggestion. I have got him in RG and sent a message to him. Hope he will help me. Thank you once again!!
Thank you very much Dr. Prashasti Saxena for your comments. You have given me an insight on it. Thank you.
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