Raster images

[N M]

I will try to create my own raster now.

Thank you

>Greetings Nuri,
>   Here is the deal.  The Tif from the existing example is most likely in
>GeoTif Format.  That means that there is extra info in the tif file.  If
>you open it in an "image" program....Coral.....then save that image....you
>strip out the extra info from the file.  So now it no longer works.
>
>   Now you have a plan tif image that if you want to display it correctly
>you will have to have a world file to go along with it.  These files are
>in tfw or wld format.
>
>If you have a file called example.tif you will need a file called
>example.tfw to go along with it that contains the extra info.
>
>  Georeference with World Files
>World files are a simple mechanism for associating georeferencing (world
>coordinates) information with raster files. ESRI was the first company to
>propagate the use of world files, and they often used with TIFF instead of
>embedding georeferencing information in the file itself.
>
>The world file contents look like the following. The first coefficient is
>the X pixel size. The second and third are rotational/shear coefficients
>(and should normally be 0.0). The fourth is the Y pixel size, normally
>negative indicating that Y decreases as you move down from the top left
>origin. The final two values are the X and Y location of the center of the
>top left pixel. This example is for an image with a 2m x 2m pixel size,
>and a top left origin at (356800E, 5767999N).
>
>2
>0.0000000000
>0.0000000000
>-2
>356800.00
>5767999.00
>
>The name of the world file is based on the file it relates to. For
>instance, the world file for aerial.tif might be aerial.tfw. Conventions
>vary for appropriate endings, but with MapServer the extension .wld is
>always OK for world files.
>
>You can read all about them here
>http://mapserver.gis.umn.edu/doc44/raster-howto.html
>
>
>Dave

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