Just recently I took part in generating a series of 5 ortho maps down a Gravel River system to look at Gravel migration and measuring areas of gravel beaches and working out cut and fill.
1st question. Can you stitch all 5 maps together to create on seamless map or would this be too big a file.
The local Regional Council I work for here in NZ is looking to put the maps into their GIS system and the River Engineers are interested in getting me to map before and after floods to workout the movement of gravel down the system.
2nd Question. By chance when I flew these maps the river was very clear and playing around with the Distance Annotation and placing a marker across a deep pool in the river I found the height profile it displayed looked to be showing the bed level. I am yet to go back and measure the profile of the pool with our ADCP instrument but it looks to be very similar. Is it possible that in very clear water the drone images are good enough for DD to actually pick up the riverbed level, if so this could be a very valuable tool for us Hydrologists.
Any thoughts would be much appreciated