[OAM-talk] open source orthorectification for grassrootsmapping.org

[Marc Pfister]

There's some or all of the functionality in GRASS, OSSIM, E-FOTO, and the NASA Vision Workbench. Making it all work as a webservice sounds tough to me.

I think you'll also have some challenges it that you probably only have low resolution and quite possibly low accuracy orthoimagery to control against, coarse (if any) DEMs, and a camera with a short focal length, no fiducials or calibration report. I wonder if simple warping will get you just about as far in terms of accuracy.

At Random Hacks of Kindness I started on some code that used SIFT to try to match UAV photos to control imagery and generate a GCP list that could be fed into gdalwarp. The UAV imagery did have some rough GPS positioning that limited the search space for the SIFT algorithm. It's still (argh) unfinished, but you can see the start here:

http://github.com/drwelby/UAV-Ortho

-Marc Pfister



From: talk-bounces at openaerialmap.org [mailto:talk-bounces at openaerialmap.org] On Behalf Of Jeffrey Warren
Sent: Wednesday, February 17, 2010 8:36 AM
To: geodata at lists.osgeo.org; talk at openaerialmap.org
Subject: [OAM-talk] open source orthorectification for grassrootsmapping.org

Hi all - I'm looking for an open source way to do automated orthorectification as a web service to support http://grassrootsmapping.org balloon/kite mapping imagery.

Something that would generate GCPs and stitch imagery, and (even better) perhaps generate tiles.

I'm a bit new to rectification, any suggestions?

Thanks,
Jeff
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