Hello, I have air quality data and I need to interpolate them. The points (samples) are distributed in grid pattern and the distance between them is 1000 meter. I'm not familiar with Arc GIS and I don't know which type of interpolation I should use. I was told that I should use different types of interpolation and then check their RMSE. Can you explain me how I can check the RMSE of interpolations in Arc GIS? I think the lower RMSE is the better. yes?