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I am doing Flood routing and Dam Breach modelling of the Case study of ancient times which is 1000 years old.  I have a DEM of 30 m resolution SRTM and I want to modify its elevation so that the terrain can possibly resemble the old ancient terrain when there were no Bridges and Dams.  Are there any possible way to do that with ArcHydro?? 
Hi there,  Would anyone explain to me how I unify the coordinate systems between GPS and Total Stations measurements in GIS? I have the satellite image of the area of interest. GPS data is matched with the satellite images in GIS, but the Total stations data does Not (it is very far from the area of interest). I want to visualise the differences… (Show more)