I have been working through trying to get the NOAA ridge radar image to act as an overlay. Looking at other entries on the site I have worked with the image and have it projecting correctly but the png has a semi opaque white background I can't seems to get rid of.

I have tried setting transparent = true

it appears that the warp is adding the white background

gdalwarp -t_srs '+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' radartemp1.png radartemp2.png

i tried also adding -dstalpha but then the layer comes out black...

anyone know how to solve this problem

  • Which "site" are you referring to?
    – whuber
    Jun 16, 2012 at 12:27
  • this gis.stackoverflow.com I have searched the site for answers but have come up stumped on this background issue. and also Google etc.
    – MB.
    Jun 16, 2012 at 16:04

1 Answer 1


Ok this was due to the fact that I had not used the correct projection should have been projection: "EPSG:3857"

Answered here.

Can't display overlay

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