Raster layers from PNG + .wld file

[Frank Warmerdam]

On 1/24/06, Stephen Davies <sdc at sdc.com.au> wrote:
> G'day all.
>
> I have been successful in using ECW files as raster layers but am now
> trying to use a PNG file plus a .wld file with blank results.
...
>     EXTENT 735810 8454630 742810 8461630
...
> My dd1.wld file looks like:
>
> 2.1
> 0.0000000000
> 0.0000000000
> -2.1
> 746046.00
> 8450252.00

Stephen,

The world file above indicates that the left-most "X" value
in your png file will be 746046E which is east of the right
most side of your map extent (742810E).  Your PNG file
may be drawing just fine ... it just isn't on your map.

Failing to analyse extents of data carefully is a common
user error.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent