I'm currently using QGIS 1.8.0
I would like to create a polygon layer from a point dataset, where the size of the polygons relates to the resolution of the grid reference.
The ultimate aim would be mapping species density - I have a numerous spreadsheets of species presence at certain locations but with differing resolutions (2km, 1km and 100m). So, I would like polygons of each grid square, so that the number of different species recorded within that square can be counted. I believe this is a similar method to how the NBN Gateway maps using their new interactive map http://www.nbn.org.uk/