I am fairly new to GIS.
I am currently evaluating wildlife sightings across transect lines and want to calculate the occurrence of encounters, per area surveyed. So essentially look at encounter rates across square mile grid cells to create a thematic map.
I am using Arcgis 10.4 for desktop and so far I have created a fishnet grid within a polygon of the surveying area and I have joined this with my sightings point data. From this I can see counts of sightings in each cell, however, what I want to depict are sightings per square kilometer. I am totally stuck from this point on. I have tried a few things but nothing seems to be quite right!