I have a large number of lat/long positions at sea for a geographical area (stored as CSV). This geographical area also contains lots of land area. I want to divide the sea area into a grid (f.ex down to four decimals degrees lat/long), and check each cell in that grid if there is a lat/long position present. Is this possible to do in an easy way?
Tools: ArcGIS (never used before), any other free GIS programs, python