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ERROR - alpha to nodata

Hey y’all,

I’m trying to run Step 3 on my project but I ran into this error and I can’t seem to figure out what it means. I couldn’t find any mention of it on the forums or Google. Any help would be much appreciated.

[Error]: Failed to write to <C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_1_1.tif>
[Warning]: Warning w9020: GDAL Error <1> TIFFReadEncodedStrip:Read error at scanline 4294967295; got 12000 bytes, expected 20000
[Warning]: Warning w9020: GDAL Error <1> TIFFReadEncodedStrip() failed.
[Warning]: Warning w9020: GDAL Error <1> C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_1_2.tif_tmp.tif, band 1: IReadBlock failed at X offset 0, Y offset 409
[Warning]: Warning w9020: GDAL Error <1> GetBlockRef failed at X block offset 0, Y block offset 409
[Error]: Failed to write to <C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_1_2.tif>
[Warning]: Warning w9020: GDAL Error <1> TIFFFetchDirectory:C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_1_3.tif_tmp.tif: Can not read TIFF directory count
[Warning]: Warning w9020: GDAL Error <1> TIFFReadDirectory:Failed to read directory at offset 8
[Warning]: Warning w9020: GDAL Error <1> No source dataset specified.
[Error]: Failed to write to <C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_1_3.tif>
[Error]: GDAL error 1
[Warning]: Warning w9020: GDAL Error <1> TIFFFetchDirectory:C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_2_1.tif_tmp.tif: Can not read TIFF directory count
[Warning]: Warning w9020: GDAL Error <1> TIFFReadDirectory:Failed to read directory at offset 8
[Warning]: Warning w9020: GDAL Error <1> No source dataset specified.
[Error]: Failed to write to <C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_2_1.tif>
[Error]: GDAL error 1
[Error]: Unable to read Exif from C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_1_1.tif
[Error]: Unable to read Exif from C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_1_2.tif
[Error]: Unable to read Exif from C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_1_3.tif
[Error]: Unable to read Exif from C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_2_1.tif
[Error]: Unable to read Exif from C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_2_2.tif
[Error]: Unable to read Exif from C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue_2_3.tif
[Warning]: Unable to open reflectance tiles C:/Users/Michael/Desktop/UAV/UAV Projects/Scheid Vineyards/190816_Scheid/pixProject_190816_Scheid/4_index/reflectance/tiles/pixProject_190816_Scheid_noalpha_reflectance_blue.tif

So…I restarted my computer and ran it again and it worked out fine. No clue why but thought this might help someone later.

1 Like

Hi Michael,

Thanks for letting us know. One of the reflectance tiles failed to write. Which version of the software are you using? This can happen due to hardware sometimes (lack of space or RAM issues). If it happens again, do send us a support ticket with the logfile, or you can also upload the logfile in google drive and share the link here.