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P3D v2 Error converting jp2 files

twharrell

twharrell

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293
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us-virginia
I just downloaded some compressed NAIP scenery tiles from USGS (6 total) and am trying to convert there to geotiff format using fwtools. After entering the commandline (I am using one kindly provided to me by Jim Robinson) I get the following error for each tile:

Error 6 - No translation for Mercator_Auxiliary_Sphere to PROJ.4 format is known

Any ideas? Thanks!

Todd
 
They should be GEOTIFF format. You need to reproject (gdal warp) them to WGS84 projection. You shouldn't need to input the original projection. Run this code.

gdalwarp -of GTiff -co "INTERLEAVE=PIXEL" -t_srs "+proj=latlong +datum=WGS84" -r cubic "input1.tif" "input2.tif" "output.tif"

This will create a mosaic of the images if there's more than 1 input.

You can even define the pixel/metre resolution here:

gdalwarp -of GTiff -co "INTERLEAVE=PIXEL" -t_srs "+proj=latlong +datum=WGS84" -r cubic -tr 0.0000025 0.0000025 ""input1.tif" "input2.tif" "output.tif"

(Change the number to suit your needs)
 
Shaun,

Right, but I have to convert the jp2 files to Geotiff format and that's when I get the above error. I ran a code provided to me by Jim to do just that but I get the above error instead. Once I convert the files to GeoTiff, then I'll run the gdalwarp code.

Thanks for the resolution tip.

Todd
 
Oh right, helps if I read properly.

I've never downloaded jp2 from USGS. Is it high resolution orthoimagery?
 
Shaun, USGS has gone to the jp2 format to speed up the downloading process. At least IIRC that's what it said somewhere on their website. I downloaded some imagery for a project several months ago and the resolution was .15m per pixel. This was the best resolution that they had available. It really depends on the location. I think I was lucky to get such high resolution.
 
I downloaded some additional 60 cm and 15 cm imagery (non-NAIP) and gdalwarp worked just fine on these, just FYI. The NAIP jp2 files I had issues with were 100cm anyway, so not very good. I ended up trashing those.

Todd
 
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