I am new to spatial analysis and currently working on spatial conflict analysis with R. I want to use PRIO-GRID by countries and overlay conflict points on it (grid-cell month as the unit of analysis). I want to use UCDP-GED data for violent events as it is perfectly compatible with PRIO-GRID. I can visualize the countries first with shape files and overlay points on it separately, however, it seems that I need to merge these two data frames first and then subset the country I need as there will be data loss. I've searched a lot but couldn't figure out how to do it.
I would appreciate any help a lot! Many thanks in advance!