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I would like to know why I am getting no data pixels in my soil wetness raster, since none of the source rasters used to calculate the SWI have no data values. all layer values

method I used: soil data from HWSD FAO used to derive depth and calculated soil hydraulic conductivty by SoilPAR program. First made TWI: SRTM DEM-watershed clip-flow direction-flow accumulation DEM-slope-slope radian-remove zero values from radian raster then calculate TI with raster calculator: this gives a nice raster without No Data values: TWI close up For the STI I calculated the transmissivity (=soil hydraulic conductivity*soil dpeth*0.000864), again without No DATA values Then I used raster calculator for Ln[(average of transmissivity)(flowaccu)/(transmissivityslope)] And suddenly everything is pixelated and there are No Data pixels everywhere. I understand that the lakes are NoData pixels but I don't think this should be the same for other places. SWI closeup of same area

Why do I get them and how to prevent them?

  • What software are you using? Please add the relevant software tag to your question. – csk Jul 15 at 14:54
  • arcmap 10.4 on windows 10 64bit laptop 8 GB RAM – Soof Jul 16 at 9:25

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