Re: TFW format
Petr <[email protected]>
| Newsgroups | gmane.comp.gis.freegis |
|---|---|
| Message-ID | <[email protected]> |
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 <[email protected]> wrote: > >>Hello, >> >>i need help with tfw format. I have tiff image and tfw file with description: >>200.00000000 >>0.00000000 >>0.00000000 >>-200.00000000 >>3408200.0000 >>5635500.0000 >> >>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, [email protected] > light and sound - activate the windows | http://pobox.com/~warmerdam > and watch the world go round - Rush | Geospatial Programmer for Rent > > _______________________________________________ > Freegis-list mailing list > [email protected] > https://intevation.de/mailman/listinfo/freegis-list > From - Thu