Morgan - thanks, knowing those were completely different dates does make the color correction more challenging.
Can you clarify terminology and workflow? You said "mosaic dataset" and I just want to clarify how you're using them. https://pro.arcgis.com/en/pro-app/latest/help/data/imagery/mosaic-datasets.htm
Are you processing date 1 in Drone2Map, then a separate project for date 2 (etc.), creating multiple true orthos for different sections of campus, then managing those orthos using a mosaic dataset? Presumably intending to create a raster tile cache (basemap) out of the mosaic dataset when campus is complete?
If correct, this is a perfectly valid workflow for the geometry of the pixels, but unfortunately color correction will be much more difficult because each true ortho is adjusted for color, but the edges will be impossible to match. I'd suggest one of three alternatives to improve the tonal mismatch between orthos:
1) fastest/easiest is to apply blending across the seamlines between the true orthos, and you should be able to apply a wide blend distance (? 10 meters?) if you have adequate overlap. (And for future flights, ensure a lot of overlap between the output orthos, e.g. 2 full flightlines if possible). This should look relatively good at large scale (zoomed way in) but when you zoom out, you'll still see tonal differences between the flights.
2) another option is to process all drone images in a single Drone2Map project - this should automatically compensate for the tonal differences but depending on total number of images the project may be too large. (Do you have access to the ArcGIS Reality Extension for Pro? That should allow you to scale to a larger single project)
3) I was going to describe a third option but I'm pretty sure this will not yield acceptable results. You could use Drone2Map flight-by-flight to run photogrammetric processing but not create true orthos, then apply the exterior orientation (xyz, omega phi kappa) for all of the individual frames using a mosaic dataset to rectify the images on-the-fly; but this won't give you a true ortho, and with a 200' flight over campus buildings the horizontal layover will be unacceptable. (if you ever had to do a large project over natural terrain, this approach might be perfectly acceptable)
Cody
