I was just thinking about an interesting thing... Have you seen this map that made the rounds in social media a year ago or so: http://io9.com/more-...ide-t-493103044
I was thinking about how to repeat that analysis, but for an arbitrary point, especially close to the -180/180 meridian, or closer to the poles. Let's say one picks a point in Chukotka (far Siberia), Hawaii or Alaska, how could one create this circle (easily) in a software like ArcGIS.
Let's say I have a population dataset with absolute population in each grid cell for a 1 deg raster. Doing the actual circle analysis is not so hard, those tools are built into ArcGIS (spatial analysis), but handling the edges of the raster is different.
This might be one case where it would be easier to maybe calculate this using spherical coordinates.
For ArcGIS, I am thinking a bit about shifting the dataset so that the arbitrary point is in the middle (0,0), do the analysis, then shift back... Not sure how to do the shift though!