Raster layers from PNG + .wld file

[Stephen Davies]

Thank you Frank.

I don't know what I was thinking of when I created the world file. (I 
used bottom left instead of top right).

It now works properly.

Cheers,
Stephen

On Tuesday 24 January 2006 23:29, Frank Warmerdam wrote:
> 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

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