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- README.TXT File
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- RADIUS Unclassified Data Set
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- Model Board 1 Data Release V1.1
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- November 11, 1992
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- The enclosed 8mm tape and diskette contain 28 image
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- files, revised "ground" control data files, and a number of
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- items requested by several of you. The Mac diskette
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- contains duplicates of all but the image files for those who
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- have Mac or PC systems for word processing. A printout of
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- the information files is also enclosed. The site diagram is
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- on four sheets to be taped together.
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- The 8mm tape was written by a Sun using the tar
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- command:
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- setenv TAPE /dev/rst0
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- tar c <list of file names>
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- The diskette is a 1.44 MByte Mac diskette and contains one
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- MacDraw file and a number of Mac/MS-Word and ASCII text
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- files, of which this is one. A list of the files and their
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- contents is contained in PACKING.LST.
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- The tape contains 28 image files. The original plan
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- was to take 40 images from model board 1. However, Oscar
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- and Bill requested that we change the model board and take
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- several images which would support a "change detection"
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- scenario, so we have reserved up to 12 images for this
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- purpose. These scenes will contain many more vehicles,
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- varying numbers of vehicles in finished goods inventory
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- storage areas, roof patches (to break up the eveness of the
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- roof gray-scale), and partial destruction of one building
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- from a fire. Work is underway now to produce these images.
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- A similar change detection scenario has been developed for
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- the second model board and will be incorporated into the
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- images taken.
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- Some of the ground control data has changed, as has the
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- format. The first column in the data table contains an
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- English description and reference to the MacDraw diagram.
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- On the MacDraw diagram of the site each building is numbered
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- and there is a pointer to the position of each ground
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- control point. This MacDraw file obsoletes the snap-shots
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- originally supplied. In addition, several of you requested
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- additional control points at ground level and additional
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- ground-roof measurements of the same vertical edge. Thus,
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- there are additional points in the V1.1 release not present
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- in the first (V1.0) release, as well as several deleted
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- points.
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- Several of you discovered that there were
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- inconsistencies in the original ground control data file.
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- Upon investigation, we discovered that the machine operator
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- who measured the model board had misinterpreted his
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- instructions and in many of cases measured the wrong points!
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- We re measured every point and believe the enclosed file
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- corrects these errors. However, if you find any point that
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- seems incorrect or unreasonable, please bring it to our
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- attention immediately. We apologize for the errors. You
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- are all aware of the difficulty recording and transcribing
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- 400 random numbers accurately. (Note that it was not
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- possible to replace the model board on the machine in
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- exactly the same position, so there are small differences in
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- all of the measurements. Without moving the board we
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- randomly re measured about a dozen points and found the
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- values repeatable to the 2nd or 3rd decimal place.)
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- Several of you requested camera calibration data for
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- the camera setup used to take the images. This information
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- is contained in CAMERA.TXT.
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- Several of you commented on some unusual image
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- characteristics which result from use of a model board in
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- the Image Simulation Facility (ISF). First, it should be
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- noted that the "sun" in the ISF is not 93,000,000 miles
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- away. It is actually only about 20 feet (see CAMERA.TXT)
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- from the model board. Thus, the shadow angles will not be
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- entirely uniform from edge to edge. If your algorithm is
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- critically dependent on absolutely uniform shadow angles,
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- you should use the upcoming aerial photograph images of Ft.
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- Hood and Houston.
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-
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- Second, the look and sun angle and azimuth contained in
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- the image parameter files are only accurate to +/- a few
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- degrees. These parameters were provided to give an
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- approximation of the image taking parameters, but if you
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- need exact values for these parameters you will probably
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- need to perform a camera resection using the ground control
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- data.
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- Dave McKeown has suggested that, in order to compare
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- results between laboratories, for a selected subset of
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- ground control points in each image there be a "standard"
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- control point to image pixel correspondence. While this
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- would certainly be useful, currently producing such a
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- standard correspondence is not in anyone's statement of
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- work, nor do we have funding to support its production. If
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- any of you plan to produce such correspondences and would be
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- willing to share the data, we would be happy to include it
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- on the next distribution.
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- Finally, again, please address any comments or
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- criticisms to me at:
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-
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- Jim Green
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- 3300 N. 23rd St.
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- Arlington, VA 22201
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- 703-351-2801: office
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- 703-351-7760: home
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