RADIUS IMAGERY SET
          MODEL BOARD No. 1 - INDUSTRIAL SITE
             GROUND TRUTH FILE DESCRIPTION

FILE:  BD1INFO.TXT

	The file BD1GT.DAT contains measured ground truth data for
the first RADIUS model board.  In order to simplify computer
reading of that file, it has been formatted as four columns of
ASCII text numbers separated by spaces with no explanatory text.

	The first column of the file indicates the identification
number of the ground truth measurement point.  These numbers
correspond to the numbers on the white tags in the documentary
photos as well as the textual description to be provided.

	The second, third, and fourth columns contain the x, y, and
z coordinates, respectively, for the identified ground truth
measurement point.  The unit for the coordinates is INCHES and is
reported AS MEASURED ON THE MODEL BOARD.  The model board was
constructed to have a scale of 1:500 where one inch on the model
board represents 500 inches in the simulated scene.  Not all
specified ground truth points could be successfully measured. 
These points do have identification numbers in the measured
ground truth file but have the x, y, and z coordinate columns
left blank.