[Freegis-list] TFW format

Petr freegis at pbox.cz
Thu Oct 6 16:42:59 CEST 2005

I think that coordinate system is S-42. Is this possible?
I have just tif and tfw files.

Frank Warmerdam wrote:
> On 10/6/05, Petr <freegis at pbox.cz> wrote:
>>i need help with tfw format. I have tiff image and tfw file with description:
>>I searched internet and not found any information about using of this map.
>>I need transform standard GPS coordinate (eg.: 50d04m55sN 14d26m03sE) to pixel coordinate in my map
>>  (eg.: 256px,414px aproximately) and backwards.
> Peter,
> You need to determine what coordinate system your image is using.  It
> is clearly some sort of projected coordinate system.  Till you know
> that, the .tfw isn't going to do you much good.
> By the way, the .tfw is saying that the center of the top left pixel
> of the image is at (3408200,5635500) and that each pixel is
> 200x200 (likely 200 meters by 200 meters).
> But without the coordinate system, you can't relate that to latitude
> and longitude values.
> Once you do have the coordinate system, you can use the PROJ.4
> (or another projections package) to convert between lat/long values
> and projected coordinates.  Then use the .tfw values to turn the
> projected values into pixel/line locations.
> BTW, do you happen to have a .prj file too?
> 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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