We have the following raw data, thanks to NAVAIR

• Video in "/playpen/geo_star/china lake video" on phidias
  • 1:09 video (mpeg & raw).
    • The flight path is roughly from 34:24:25N, 118:22:40W to 34:25:40N, 118:20:13. See gps track: gpsforVNtoCL0003.txt
    • If you use Google Earth, you can get these placemarks: ChinaLakeVideo3.kmz
  • Agua Dulce geo tiff imagery (aquadulce4.tif contains the path) at about 1m/pixel
• elevation data in "/playpen/geo_star/china lake data"
  • DTED (w119/n34.dt2 contains the path)
  • 1:24,000-Scale Raster Profile Digital Elevation Mode (STDS format) LAT:: 34 22 30.0000, N LONG:: -118 15 0.0000

From seamless.usgs.gov, we have downloaded the following around the path.

• Elevation
  • SRTM 1arcsec elevation data
  • NED 1arcsec elevation data
  • NED 1/3arcsec elevation data
• Imagery
  • Landsat thematic mapper imagery 3 bands at 1arcsec
  • Digital Ortho quarter Quad imagery, 1m/pixel
  • DRG 24k map image, 1m/pixel

I have converted all of the datum to WGS84, and projected to UTM zone 11N, clipped to lower left 373400, 3808200 (upper right about 377100, 381500), and wrote them out as ASCII files. This table lists the matrices that result. You can obtain the elevation data here (782Kb) and ask me for the (20Mb zipped) imagery.

• cl_elev.zip: Clipped UTM for china lake video VNtoCL0003^?
• A tutorial introduction to Universal Transverse Mercator (UTM) coordinates (focussed on their use with GPS) http://www.maptools.com/UsingUTM/

-- JackSnoeyink - 14 Jan 2006

In MATLAB, I loaded these and interpolated to NED3 resolution, then computed errors and slope errors. See http://www.cs.unc.edu/~snoeyink/ChinaLake3Elevhtml/Compare4Elev_chinalake.html. Click here for the .mat file.

-- JackSnoeyink - 17 Jan 2006
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