Re: [Qgis-user] Question about Weighting Power value when running Grid-Inverse Distance to a Power

2019-09-17 Thread J.O.Williams
A power of 1 is a linear interpolation among all points in the search radius. A power of 2 causes the "closest point" in the search radius to have a slightly higher weight. A power of 4, 6 and especially 10 causes the closest point to behave like a polygonal or  theissen polygon. A powe

Re: [Qgis-user] Question about Weighting Power value when running Grid-Inverse Distance to a Power

2019-09-17 Thread Falk Huettmann
Dear Colleagues, as we work on such topics ourselves, let me point out please that those 'sophisticated methods' of interpolation etc have 100% nothing to do with climate, or temperature, and such units, and likely are very misleading for outcome. One may call it 'data smearing' but not more. (S

Re: [Qgis-user] Question about Weighting Power value when running Grid-Inverse Distance to a Power

2019-09-17 Thread DelazJ
Hi, Tracking information from the Help button in the algorithm dialog led me to https://gdal.org/tutorials/gdal_grid_tut.html#inverse-distance-to-a-power Hope that helps, Harrissou Le mar. 17 sept. 2019 à 12:00, Daniel Zepeda Rivas a écrit : > When using the Raster -> Analysis -> Grid (Inverse

[Qgis-user] Question about Weighting Power value when running Grid-Inverse Distance to a Power

2019-09-17 Thread Daniel Zepeda Rivas
When using the Raster -> Analysis -> Grid (Inverse Distance to a Power) At the menu just before pressing run, can somebody please explain me the effect of the "Weighting power" option in the interpolation process? I'm trying to make a temperature map based on points representing each weather st