I have a tiff that was created with Pix4dmapper. This tiff has coordinates embedded (as seen in the logs below) (I think that makes it a geotiff?) as well as a tfw file associated with it.
Opening the tiff in an image viewing (Windows photo viewer) or editing tool (Paint.NET) shows that the region outside of my imagery is transparent.
Creating tiles with gdal2tiles creates pngs that have black where there is transparency in the source tiff.
How do I fix this? (Logging and sample output below)
> gdal2tiles --versionGDAL 1.11.2, released 2015/02/10> gdalinfo stadium3857.tifDriver: GTiff/GeoTIFFFiles: stadium3857.tifSize is 11938, 10667Coordinate System is
ROJCS["WGS 84 / Pseudo-Mercator", GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4326"]], PROJECTION["Mercator_1SP"], PARAMETER["central_meridian",0], PARAMETER["scale_factor",1], PARAMETER["false_easting",0], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]], EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs"], AUTHORITY["EPSG","3857"]]Origin = (-11713078.632369816000000,4839234.097803738000000)Pixel Size = (0.018605312329563,-0.018605312329563)Metadata: AREA_OR_POINT=Area TIFFTAG_SOFTWARE=pix4dmapperImage Structure Metadata: INTERLEAVE=PIXELCorner Coordinates:Upper Left (-11713078.632, 4839234.098) (105d13'13.35"W, 39d48'57.46"N)Lower Left (-11713078.632, 4839035.635) (105d13'13.35"W, 39d48'52.53"N)Upper Right (-11712856.522, 4839234.098) (105d13' 6.17"W, 39d48'57.46"N)Lower Right (-11712856.522, 4839035.635) (105d13' 6.17"W, 39d48'52.53"N)Center (-11712967.577, 4839134.866) (105d13' 9.76"W, 39d48'54.99"N)Band 1 Block=11938x1 Type=Byte, ColorInterp=Red NoData Value=-10000Band 2 Block=11938x1 Type=Byte, ColorInterp=Green NoData Value=-10000Band 3 Block=11938x1 Type=Byte, ColorInterp=Blue NoData Value=-10000Band 4 Block=11938x1 Type=Byte, ColorInterp=Alpha NoData Value=-10000> gdal2tiles -p mercator -r lanczos -z 16 stadium3857.tif 3857tilesGenerating Base Tiles:0...10...20...30...40...50...60...70...80...90...100 - done.Generating Overview Tiles:0...10...20...30...40...50...60...70...80...90...100 - done.Sample output at 16 zoom
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Opening the tiff in an image viewing (Windows photo viewer) or editing tool (Paint.NET) shows that the region outside of my imagery is transparent.
Creating tiles with gdal2tiles creates pngs that have black where there is transparency in the source tiff.
How do I fix this? (Logging and sample output below)
> gdal2tiles --versionGDAL 1.11.2, released 2015/02/10> gdalinfo stadium3857.tifDriver: GTiff/GeoTIFFFiles: stadium3857.tifSize is 11938, 10667Coordinate System is
ROJCS["WGS 84 / Pseudo-Mercator", GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4326"]], PROJECTION["Mercator_1SP"], PARAMETER["central_meridian",0], PARAMETER["scale_factor",1], PARAMETER["false_easting",0], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]], EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs"], AUTHORITY["EPSG","3857"]]Origin = (-11713078.632369816000000,4839234.097803738000000)Pixel Size = (0.018605312329563,-0.018605312329563)Metadata: AREA_OR_POINT=Area TIFFTAG_SOFTWARE=pix4dmapperImage Structure Metadata: INTERLEAVE=PIXELCorner Coordinates:Upper Left (-11713078.632, 4839234.098) (105d13'13.35"W, 39d48'57.46"N)Lower Left (-11713078.632, 4839035.635) (105d13'13.35"W, 39d48'52.53"N)Upper Right (-11712856.522, 4839234.098) (105d13' 6.17"W, 39d48'57.46"N)Lower Right (-11712856.522, 4839035.635) (105d13' 6.17"W, 39d48'52.53"N)Center (-11712967.577, 4839134.866) (105d13' 9.76"W, 39d48'54.99"N)Band 1 Block=11938x1 Type=Byte, ColorInterp=Red NoData Value=-10000Band 2 Block=11938x1 Type=Byte, ColorInterp=Green NoData Value=-10000Band 3 Block=11938x1 Type=Byte, ColorInterp=Blue NoData Value=-10000Band 4 Block=11938x1 Type=Byte, ColorInterp=Alpha NoData Value=-10000> gdal2tiles -p mercator -r lanczos -z 16 stadium3857.tif 3857tilesGenerating Base Tiles:0...10...20...30...40...50...60...70...80...90...100 - done.Generating Overview Tiles:0...10...20...30...40...50...60...70...80...90...100 - done.Sample output at 16 zoom
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