I'm using a code to simulate flood events and I need to build two main files: one with the river channel width and another one with the bed elevation (both in ARC-info ascii raster format).
I've managed to create a new field in the attributes table and insert a constant width value, but when it comes to generate the raster grid with the bed elevation I'm lost. I've tried "Add surface information", "join" and "interpolate" tools so far, but it doesn't not work as I expected.
The final outcome has to be a ascii file with NoData cells (=-9999) for those areas where the river channel does not exist and bed elevation values for those cells where the river is present.
I have beginner-intermediate programming knowledge (VBA, DOS and a bit of Python mainly) and I'm working with ArcGIS 10.4.1; the final grid has to contain 1500 columns and 1000 rows, since I'm working with 6 tiles of 2 m resolution DEM data.