I have N number of TIFF files corresponding to each radio stations in my data, and I am trying to measure the approximate signal strengths from each of these stations at K geographic locations(say for example, municipalities) My aim is to build a N x K database. But the problem is that my TIFF files are multiband - 3RGB + 1 Alpha, i.e., for each station-municipality combination, I have four measures of average signal strength: Avg_R, Avg_G, Avg_B and Avg_Alpha. So, I was wondering what I should do if I wanted to create a single measure of signal strength for each of these station-municipality combinations with minimal loss in information (i.e., I would really like to use the information we have from all the four bands, assuming of course that would be the correct way to go).
I used Cloud RF to generate the output. The geocoded TIFF files give me the extent of signal spread, and I'm using a shapefile(at the municipality-level) to calculate the average signal strength at my locations of interest. I'm using QGIS, and I already have the zonal statistics, i.e., the average signal strengths for the 4 bands (3RGBs + Alpha; Avg_R, Avg_G, Avg_B and Avg_Alpha) corresponding to each geographic location. My question was more theoretical: if I wanted to get a single value of signal strength for each locations, what would be ideal way (theoretically) to combine the four averages?