I have 7 shapefiles, each containing a set of points.
I want to run a 'cumulative' viewshed calculation, which shows not how many points I can see in total, but how many of the 7 shapefiles can be seen simultaneously across the span of my DEM.
Essentially I want to be able to highlight which areas all 7 shapefiles are visible, and where you might only be able to see 1 or 2, regardless of the total number of points contained in the shapefiles.
I looked at this related question, but as far as I can understand it, the cumulative option in the Viewshed tool relates to the cumulative viewshed of all the points within the one shapefile - there is no option to input more than one file. However, I wondered if the answer may lie in running individual ZTVs for each shapefile, and performing some sort of raster calculation with the results?
Can anyone help me out with some advice?
I'm running Las Palmas 2.18.15 on Mac Sierra. I'm a QGIS beginner (no Python experience.)
EDIT: I could merge them, but if I understand correctly, this would result in a viewshed which highlights visibility of ANY of the points, regardless of which shapefile the points originally came from? I want to keep the points grouped, and calculate how many groups of points I can see from any single position - it doesn't matter which points or groups are visible, just if one group, two groups, three groups, four groups, etc. are visible, which is why I have created each group of points in a separate shapefile.