PDA

View Full Version : Command line SW to plot Lambert Azimutal Equalarea projections?



jumpjack
02-08-2009, 03:03 PM
I start a different topic besides this one (http://www.cartographersguild.com/showthread.php?t=4216)'cause I hope this one will bring to discover a different SW.

I found, using Wilbur software, that with LAE projections each area delimited by parallels and meridians maintains its shape (rectangle, triangle, trapeze) when I change the projection center: I guess it means I can use a different center to project each single "tile", so obtaining a 7200 pieces puzzle which can be glued over a sphere... :o 8)
Is this correct?

Does it exist a command line program I can use to bacth project 7200 tiles?

This method should be better than using "gores", as they don't match correctly, and paper keeps "curling" along the curve... :(

jumpjack
02-08-2009, 03:25 PM
Would DGALWARP be suitable?
http://www.gdal.org/gdalwarp.html
It relies on PROJ.4, which does support (http://www.remotesensing.org/geotiff/proj_list/lambert_azimuthal_equal_area.html) Lambert Azimutal Equal Area... but which is the right command line?

I can't understand False Easting and False Northing.

Redrobes
02-08-2009, 03:59 PM
That's a nice little app there I will have to play with that !

I was going to suggest using a Perl/Python script to do it instead but I guess you would need a lot of ancillary stuff to get the image in and out and the math to do it correctly.

Sorry I don't know about the params to drive that app though I will have a go and see what I come up with. Might be a while posting back tho - time seems to slip through my fingers of late.

Redrobes
02-08-2009, 04:09 PM
Just throwing you these two links which might be useful.

http://trac.osgeo.org/proj/wiki/GenParms -- about half way down.

http://en.mimi.hu/gis/false_easting.html