I am currently using QGIS, and have developed a vector grid (hexagonal). I have a separate layer with point data. For each grid cell I need to count the number of points in that cell (but also all adjoining cells).
I searched for this problem on Google and Stack Exchange, but no solutions I've been able to find nothing.
Some diagrams to explain, below.
Image 1: I want to calculate a value for this grid cell
Image 2: Value for selected cell = the number of points within this cell + all adjoining cells