I reclassified a raster layer as a geotiffs using ArcGIS 10.5. The resulting reclassified raster had two values in the ArcGIS reclassify function, NoData and 1.

When I bring the geotiff into QGIS 2.18 the raster displays black with nan values. I have tried to reclassify the resulting geotiff using GRASS but that returned an error. Both QGIS and GRASS freak out over nan values!

How do I get this geotiff to display the nan values as transparent and the 1 values to display a color?

  • try to set zero values to null in with con tool or mask it out in ArcGIS in the first place. It might help
    – Amadeus
    Commented Feb 3, 2018 at 18:23

2 Answers 2


You probably need to set the nodata value for the raster. Using a tool such as gdal_translate with the option

-a_nodata -99999

or some other number that will never be used in your data, will likely help to get better results in bot ArcGIS and QGIS.

I hope this helps

  • This approach returned a new layer with the same problem.
    – GBG
    Commented Feb 5, 2018 at 6:40

Solved. In the Layer Properties-Styles set layer enhancement to No Enhancement.

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