[FWTools] Gdal_merge on large (50Gb) file

[Shaun Kolomeitz]

Dear FWtools list,

I am having problems getting a large merge fire-up using the gdal_merge command.

I have three IMG (HFA format) files in the same projection (lat/lon) each 22Gb, 20Gb and 6Gb that I am trying to merge into a single image.

I keep getting the following -

Q:\satimages>gdal_merge -o qldg.img -of HFA -v z54gclip.img z55gclip.img z56gclip.img

Filename: z54gclip.img
File Size: 48826x154049x3
Pixel Size: 0.000130 x -0.000130
UL:(137.590396,-9.999789)   LR:(143.918997,-29.966909)
Copy 0,0,48826,154049 to 0,0,48826,154049.
Traceback (most recent call last):
  File "C:\PROGRA~1\FWTOOL~1.0B2\bin\gdal_merge.py", line 488, in ?
    fi.copy_into( t_fh, band, band, nodata )
  File "C:\PROGRA~1\FWTOOL~1.0B2\bin\gdal_merge.py", line 297, in copy_into
    nodata_arg )
  File "C:\PROGRA~1\FWTOOL~1.0B2\bin\gdal_merge.py", line 130, in raster_copy
    t_xsize, t_ysize, t_band.DataType )
  File "C:\PROGRA~1\FWTOOL~1.0B2\pymod\gdal.py", line 845, in ReadRaster
    buf_xsize, buf_ysize,buf_type)
MemoryError

Any suggestions ?

With regards,
Shaun Kolomeitz
Senior Technical Officer
Systems & Support Branch
Parks Division



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