I have to create a Thiessen polygon for a site in New Jersey and all I have right now is the concentrations from samples we took in the area. What else do I need and how do I input it into QGIS to get my desired outcome? Which is to divide the total excavation into polygons based on concentrations? Any info will be a help.
The easiest way to prepare your data for importing it in QGIS usually is to create a CSV similar to
x,y,concentration 1,2,12.5 1,3,20.7 2,2,30.1
Once you have loaded the CSV, you can use the resulting layer as input for triangulation, interpolation, or any other analysis you desire.