Re: [Geowanking] Mapping Burning Man

[Mark Lucas]

Just to point out, OSSIM ( www.ossim.org ) supports ortho-rectification, precision terrain correction, and full blown sensor models if you have all of the calibration data.  For coarse stuff, you can just take an acquired image and warp it with control points which can be either GPS points or tie points to an already geo-rectified image or map. One of the best sensors thatw we have worked with lately is the Applanix/Emerge system.  The metadata is dead on and we already have that sensor model built into the OSSIM baseline.  Basically the same sensor that was used by NOAA after Katrina.  The cameras and positioning systems are designed to be put in planes.  Typically, they will rent or contract with a plane in the local area and send the sensor platform out for the mission. Really good resolution and quality, but probably fairly expensive. www.applanix.com Might be able to contact them and see who has acquired their systems in the area that you want to fly. Mark Lucas On Jun 21, 2006, at 2:07 PM, Marc Pfister wrote: Mike Cattle wrote: I use Global Mapper as a fairly inexpensive tool for a lot of my mapping needs.  While I haven't done any image rectification with it, it does have that feature.  (http://www.globalmapper.com/) Global mapper does have a nice rectification interface (it's a great program - the Swiss Army knife of GIS). However there's a difference between rectification (where the image is warped to best fit control points), and orthorectification (where the camera's orientation is calculated based on control points or sensor models, and then the image is reconstructed pixel-by-pixel as each pixel's 3d location is calculated based on it's position in the field of view and the corresponding elevation from a DEM surface model). The latter is much more accurate, and given the camera parameters even lens distortion can be removed. On something flat like the Playa standard rectification should be good enough though. But yes, you'd want to set up some sort of rig that can get the camera pointing straight down. I remember seeing some sort of self-contained airphoto rig that could be clamp to the door of most small planes. I think you could rent it. Or maybe they were selling it, with the idea that the purchaser would rent it out. I'll dig around and see if I can find it. Marc Pfister Geospatial Data Manager ENPLAN [EMAIL PROTECTED] 530/221-0440 x108 530/221-6963 Fax _______________________________________________ Geowanking mailing list Geowanking@lists.burri.to http://lists.burri.to/mailman/listinfo/geowanking ------------------- Mark Lucas (321) 266-1475 (mobile) (866) 301-0460 (work fax) ------------------- http://radiantbluetechnologies.com http://web.mac.com/mlucas17/iWeb/Site/Welcome.html

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