python - gdalwarp causes ERROR 6: PNG driver doesn't support 6 bands in gdal2tiles -


i've problem gdalwarp function.

what i've done:

i built .vrt file 6 .tif images:

gdalbuildvrt -overwrite /input/base.vrt /home/tiles/base/*.tif

my gdalinfo looks that:

driver: vrt/virtual raster files: temp/vrt/base.vrt        /home/tiles/base/17_base_1.tif        /home/tiles/base/17_base_2.tif        /home/tiles/base/17_base_3.tif        /home/tiles/base/17_base_4.tif        /home/tiles/base/17_base_5.tif        /home/tiles/base/17_base_6.tif size 60007, 40007 coordinate system `' origin = (468000.000000000000000,5510000.000000000000000) pixel size = (0.100000000000000,-0.100000000000000) corner coordinates: upper left  (  468000.000, 5510000.000)  lower left  (  468000.000, 5505999.300)  upper right (  474000.700, 5510000.000)  lower right (  474000.700, 5505999.300)  center      (  471000.350, 5507999.650)  band 1 block=128x128 type=byte, colorinterp=red band 2 block=128x128 type=byte, colorinterp=green band 3 block=128x128 type=byte, colorinterp=blue band 4 block=128x128 type=byte, colorinterp=undefined

everything works fine until now. i've done next building 1 big .tif image .vrt file:

gdalwarp -multi -r cubic -s_srs epsg:25832 -t_srs epsg:3857 -cutline /shp/17.shp -crop_to_cutline -dstalpha -co compress=lzw /input/base.vrt /output/base.tif

but, gdalinfo output tif looks like:

driver: gtiff/geotiff files: temp/base.tif size 47849, 25603 coordinate system is: projcs["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,             authority["epsg","8901"]],         unit["degree",0.0174532925199433,             authority["epsg","9122"]],         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"]],     axis["x",east],     axis["y",north],     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 = (952949.608269182615913,6400383.903813457116485) pixel size = (0.154577105681076,-0.154574816517696) metadata:   area_or_point=area image structure metadata:   compression=lzw   interleave=pixel corner coordinates: upper left  (  952949.608, 6400383.904) (  8d33'37.77"e, 49d44' 3.40"n) lower left  (  952949.608, 6396426.325) (  8d33'37.77"e, 49d42'40.66"n) upper right (  960345.968, 6400383.904) (  8d37'36.96"e, 49d44' 3.40"n) lower right (  960345.968, 6396426.325) (  8d37'36.96"e, 49d42'40.66"n) center      (  956647.788, 6398405.114) (  8d35'37.37"e, 49d43'22.03"n) band 1 block=47849x1 type=byte, colorinterp=gray band 2 block=47849x1 type=byte, colorinterp=undefined band 3 block=47849x1 type=byte, colorinterp=undefined band 4 block=47849x1 type=byte, colorinterp=undefined band 5 block=47849x1 type=byte, colorinterp=alpha

and bands causes error in gdal2tiles function:

error 6: png driver doesn't support 6 bands.  must 1 (grey), 2 (grey+alpha), 3 (rgb) or 4 (rgba) bands.

does has idea happens? why band 2-4 undefinied , band 1 gray? think should gdalinfo .vrt file (=> rgba)?


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