I am using QGIS.
- I have a county map as a single polygon, it has one FEATURE in which one FIELD is Area.
- I have a grid which also a polygon that divides the county into squares and each grid square is a FEATURE which all have a FIELD called Area.
I want a new vector layer with each grid-square as a FEATURE in which the area of the country falling within that grid square is listed under the Area FIELD.
I keep trying to Clip, Extract and Union and I keep getting an "invalid geometry" error. I know this is fairly straight-forward but I keep stumbling over this error time and time again.