Augustin,
Below is a Python function that I threw together to calculate world
file params for a rotated image and write them out to a file. It
might be of some help to you.
David.
# creates a world file for the air photo
# Args:
# outputFile - directory to write the world files to
# xResolution - pixel resolution in x direction
# yResolution - pixel resolution in y direction
# angleDeg - the angle of rotation in degrees
def
writeWorldFile(outputFile,xResolution,yResolution,angleDeg,rotatedUlXcoord,rotatedUlYcoord):
angleRad = -math.radians(angleDeg)
line1 = xResolution * math.cos(angleRad)
line2 = -xResolution * math.sin(angleRad)
line3 = -yResolution * math.sin(angleRad)
line4 = -yResolution * math.cos(angleRad)
line5 = rotatedUlXcoord
line6 = rotatedUlYcoord
try:
newWorldfFile = open(outputFile+.jgw,w)
except:
print couldn't open file
fileText = str(line1) + '\n' + str(line2) + '\n' + str(line3)
+ '\n' + str(line4) + '\n' + str(line5) + '\n' + str(line6) + '\n'
newWorldfFile.write(fileText)
newWorldfFile.close()
return
On Fri, Dec 19, 2008 at 10:31 AM, José María Michia
jose.maria.mic...@gmail.com wrote:
2008/12/19 Agustin Lobo aloboa...@gmail.com:
This could be considered a bit off-topic.
If a jpg image were well alligned with a N-S grid,
the world file would be something like:
0.4007552
0
0
-0.4007552
438209.4
4625526
but if I have to rotate 90 deg. to the left, how should I make the
file?
Any orientation,pointer etc?
The file TFW must be:
0
0.4007552
0.4007552
0
438209.4
4625526
For explanations see:
http://www.omg.unb.ca/~jonnyb/processing/geotiff_tifw_format.html
http://lists.maptools.org/pipermail/geotiff/2007-January/000362.html
Saludos
José María
Thanks
Agus
--
Dr. Agustin Lobo
Institut de Ciencies de la Terra Jaume Almera (CSIC)
LLuis Sole Sabaris s/n
08028 Barcelona
Spain
Tel. 34 934095410
Fax. 34 934110012
email: agustin.l...@ija.csic.es
http://www.ija.csic.es/gt/obster
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