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View Full Version : Started working with GDAL - Geospatial Data Abstraction Library - for work.



Robbie
07-25-2012, 07:13 AM
Hey everyone. I wanted to pop in here because I've recently started working with the GDAL (http://www.gdal.org/) for map reprojections. I have an account with the National Geospatial Agency and have acquired a bunch of Aviation Chart's in rpftoc format and am going to be reprojecting them and converting them to onscreen png for flight simulator use, but I really got a warm fuzzy about how I'm working with map data for my job finally. Anyone here ever do any GDAL work?

GDAL comes with some pretty neat tools, my favorite of which is GDALWarp, which can take images and reproject them...might be worth checking out.

ravells
07-25-2012, 01:34 PM
Congrats, Robbie! I had never heard of GDAL and then suddenly I hear about it twice in the same week from two unconnected sources! Life is strange!

Hai-Etlik
07-25-2012, 06:06 PM
Anyone here ever do any GDAL work?

Yes, I've used it, It's used as a library in a great deal of GIS software. I've even heard it's used for the low level raster routines in ArcGIS. I've used the command line interface a number of times too, including GDALGrid to interpolate a groundwater level surface for a web app and GDALWarp for various reprojection tasks. A lot of QuantumGIS's raster capabilities are realy just graphical front ends to the GDAL command line utilities.

Robbie
07-26-2012, 07:48 AM
Well, if anyone knows how to use GDAL to return a rasterized "image" to OpenGL to display given a set of lat/long coordinates, I'd love a boost...that's where I am now...Though I'm in the process of learning OpenSceneGraph to go with it...which appears to include the gdal 1.8 library.

waldronate
07-26-2012, 12:07 PM
GDAL is your friend!

I'm curious why you'd need to rasterize the lat/lon points and then present the image to OpenGL rather than just projecting the points and letting OpenGL do the grunt work of rasterization? The general technique is to project from lat/lon/alt to your final east/north/up coordinate system using GDAL and the present those points to OpenGL. My development system's acting up and needs to be redone or I'd have an example for you.