GUI to make geotiff metadata

Getting closer.

Now I have created a world (wld) file, I know the projection [UTM],
zone and datum [WGS84].

The gdal tools got as close as showing me a lat/long to go with my jpg,
but I could not convince it to save as a valid georeference tif. It did
do enough to make a gtf file from the wld file, however the gtf is not
good enough, without any zone clues I guess it cannot locate the
coordinates on the planet.

How do I get to a full gtf file, I tried various options but the
lat/long are always a couple of degrees off true. I would expect to
have fairly boilerplate tags, where only the zone need change.

Ta

Chris



Mattan wrote:

On 12 Oct 2006 17:08:07 -0700, Mr. Richard Fayler of Fort Lee, New Jersey




I believe you said you already knew the lat/lons of the corner points. If so,
you can compute the UTM zone quite simply. It is simply
longitude/6+30
done all in integer arithmetic, with West longitude negative. For example,
if your longitude is -105 (105W), that comes out to zone 13.

Once you know the zone, you should be able to tell gdal_translate how to
georeference it using your worldfile. Simply use the "-a_srs" option with the
EPSG number for that zone in WGS84 UTM. Assuming you're in the northern
hemisphere, the EPGS number for a UTM zone in WGS84 is just 32600 plus the
zone number. So if you're in, say, UTM zone 13, just tell gdal_translate
"-a_srs EPSG:32613" and give it your input raster and its associated
worldfile. It should create an appropriate geotiff with the right tags.

gdal_translate -t_srs EPSG:32613 input.jpg output.tif

If your worldfile is input.jgw (if I recall correctly), gdal_translate will
know to use it, and output.tif should show all the right tags if you do:
gdalinfo output.tif

--
Tom Russo KM5VY SAR502 DM64ux http://www.swcp.com/~russo/
Tijeras, NM QRPL#1592 K2#398 SOC#236 AHTB#1 http://kevan.org/brain.cgi?DDTNM
"And, isn't sanity really just a one-trick pony anyway? I mean all you get is
one trick, rational thinking, but when you're good and crazy, oooh, oooh,
oooh, the sky is the limit!" --- The Tick

Thanks Tom,

That was the missing step, now with this bat file I get what I wanted.

IrfanView.exe input.jpg /bpp=8 /convert=temp.tif
geotifcp.exe -e input.wld temp.tif temp_gf.tif
gdal_translate.exe -a_srs EPSG:32610 temp_gf.tif output.tif

Easy!!!

Chris

> > Getting closer.
> > Now I have created a world (wld) file, I know the projection [UTM],
> > zone and datum [WGS84].
> > The gdal tools got as close as showing me a lat/long to go with my jpg,
> > but I could not convince it to save as a valid georeference tif. It did
> > do enough to make a gtf file from the wld file, however the gtf is not
> > good enough, without any zone clues I guess it cannot locate the
> > coordinates on the planet.
> > How do I get to a full gtf file, I tried various options but the
> > lat/long are always a couple of degrees off true. I would expect to
> > have fairly boilerplate tags, where only the zone need change.I believe you

said you already knew the lat/lons of the corner points. If so,

> you can compute the UTM zone quite simply. It is simply
> longitude/6+30
> done all in integer arithmetic, with West longitude negative. For example,
> if your longitude is -105 (105W), that comes out to zone 13.
> Once you know the zone, you should be able to tell gdal_translate how to
> georeference it using your worldfile. Simply use the "-a_srs" option with the
> EPSG number for that zone in WGS84 UTM. Assuming you're in the northern
> hemisphere, the EPGS number for a UTM zone in WGS84 is just 32600 plus the
> zone number. So if you're in, say, UTM zone 13, just tell gdal_translate
> "-a_srs EPSG:32613" and give it your input raster and its associated
> worldfile. It should create an appropriate geotiff with the right tags.
> gdal_translate -t_srs EPSG:32613 input.jpg output.tif
> If your worldfile is input.jgw (if I recall correctly), gdal_translate will
> know to use it, and output.tif should show all the right tags if you do:
> gdalinfo output.tif
> --
> Tom Russo KM5VY SAR502 DM64ux http://www.swcp.com/~russo/
> Tijeras, NM QRPL#1592 K2#398 SOC#236 AHTB#1http://kevan.org/brain.cgi?DDTNM
> "And, isn't sanity really just a one-trick pony anyway? I mean all you get is
> one trick, rational thinking, but when you're good and crazy, oooh, oooh,
> oooh, the sky is the limit!" --- The Tick