What does the settings undr IDW interpolation do in Qgis

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I have a point data set that I want to interpolate.I want to use the Grid (interpolation) under: Raster- analysis- grid(interpolation)- IDW

What does Radius 1 and 2 stand for, what does they do? What do I adjust with the angle setting and the min and max points? Does anyone have a tutorial that discuss this?



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