Comments (7)
If you can do the research and provide precise details...
I will code it for you
Original comment by heldersepu
on 20 Nov 2014 at 5:56
from gmapcatcher.
[deleted comment]
from gmapcatcher.
Here's a description of the format. It can be recognized by many GIS programs.
I think for the PNG files generated ".PGW" would be needed. It's basically just
a renamed text file.
I've attached an example that I've created myself with an image exported by
.GMapCatcher and ArcGIS 10.2.2. I initially used QGIS to georeference the image
(see the tutorials on the following page for details):
http://www.qgis.org/en/site/
You can try it out with this software as well (because an ArcGIS license is
pretty expensive if you don't have one).
Specifications of the format can be found here:
http://en.wikipedia.org/wiki/World_file
Had to resample it to be able to upload it. If you need another example just
contact me.
Greetings,
Lars
Original comment by [email protected]
on 5 Dec 2014 at 11:21
Attachments:
- coord=25.403585,72.421875_zoom=5_rec11.pgw
- coord=25.403585,72.421875_zoom=5_rec11.png
- coord=25.403585,72.421875_zoom=5_rec11.png.aux.xml
from gmapcatcher.
Yes the generated ".PGW" loops simple, just 6 lines in a text file:
0.0009440562
0.0000000000
0.0000000000
-0.0007778740
72.4223470281
25.4031960362
the bottom two I can get, but the rest I have no clue how to get them...
Original comment by heldersepu
on 5 Dec 2014 at 2:08
- Changed state: Started
from gmapcatcher.
OK, 2 and 3 should always be zero, because they define rotation of the image.
Line one is related to the pixel size. I've found another explanation here:
http://webhelp.esri.com/arcims/9.2/general/topics/author_world_files.htm
QGIS seems to store georeferencing information for raster files differently, in
an .xml file. But it can read ESRI world files as well. Attached you find an
example for a QGIS georeference, along with the corresponding image.
If you need some more help, I guess it should be possible to correspond with
the QGIS developing team about that (I'm no programmer myself) over the
following mailing lists:
http://www.qgis.org/en/site/getinvolved/mailinglists.html#qgis-mailinglists
A georeference that could be read with QGIS would also mean that it could be
used in ESRI ArcGIS (can be exported in readable format for ArcGIS from there).
Original comment by [email protected]
on 5 Dec 2014 at 4:00
Attachments:
from gmapcatcher.
OK, here's some more information from ESRI:
http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?pid=3034&topicname=World_fil
es_for_raster_datasets
http://resources.arcgis.com/en/help/main/10.2/index.html#//009t00000028000000
Original comment by [email protected]
on 5 Dec 2014 at 4:04
from gmapcatcher.
Here is the deal:
From GMapCatcher we download map tiles like:
http://a.tile.openstreetmap.org/17/44279/78976.png
from that (17/44279/78976) we already have formulas to get zoom and
coordinates(lat,lon) of the upper top corner
All the Image export are of full tiles I do not split them, and each tile is
(256 x 256px)
If with that info you can produce the formulas I will be happy to add them for
you.
But unfortunately I do not have time for all the research, you can contact me
directly:
heldersepu (at) gmail.com
Original comment by heldersepu
on 5 Dec 2014 at 4:38
from gmapcatcher.
Related Issues (20)
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