Re: [OSSIM] OssimPlanet: How to prepare images for loading?

[Norman V. <nh...@ca...>]

Chung, James - AES writes:
> 
> 
> This is the contents of my world file, obtained from TerraServer USA:
> 
> 32.000000
> 0.000000
> 0.000000
> -32.000000
> 275200.000000
> 4332800.000000

Ah  this is a UTM image  but I have to guess at the zone

> 
> Am I correct in thinking there's a problem with handling the UTM
> coordinates? The TerraServer USA does not seem to give a grid
> specification, but I guess the lat-long coordinates can be used to
> deduce that. If I am correct, how do I get gdal_translate to 
> handle the
> UTM coordinates correctly (e.g. how do I specify the grid)? 
> Seems like I
> would use a different -a_srs argument -- I've tried -a_srs "+proj=utm
> +zone=18S +datum=WGS84", but that puts the image in the Indian Ocean
> rather than northern Virginia.
> 
> Can you clue me in on what I'm doing wrong?

Ah this image is for Virginia

Try
-a_srs EPSG:32618

Following from Proj4 epsg file
# WGS 84 / UTM zone 18N
<32618> +proj=utm +zone=18 +ellps=WGS84 +datum=WGS84 +units=m +no_defs
no_defs <>

Note ossimPlanet will work best with latlon images

You can use orthoigen or gdalwarp to reproject an image

HTH

Norman