The Fortran program anc_data will provide average values
and ranges for elevation, rms slope, emissivity, and Fresnel reflectivity.
Smooth and rough-surface dielectric constants, discussed in the
text, are also calculated. The only inputs to the program are
latitude and longitude coordinates for a sample box. Data values
are taken from cylindrical projection files of the maps on GxDR
Volume 2 (a mosaic of the Mercator and polar stereo maps in each
directory), which you need to copy from the public ftp account
on ceps.nasm.edu. File names are emis.cyl, rms.cyl, refl.cyl,
and topo.cyl, which in total occupy 200 Mbytes of disk space.
The program should be run in whatever directory you place these
data files. The resolution of the reprojected maps is 0.044o per
pixel. A sample run and output are shown below.
/home/campbell/guide: 236>anc_data
Output log file name?
'logfile2'
Lat Range (S, N), Long Range (W, E)?
30.863,30.999,43.502,43.666
Would you like another box (y or n)?
y
Lat Range (S, N), Long Range (W, E)?
30.418,30.465,43.495,43.568
Would you like another box (y or n)?
y
Lat Range (S, N), Long Range (W, E)?
30.637,30.746,43.842,44.030
Would you like another box (y or n)?
n
Lat, Long Box: [( 30.863, 30.999), ( 43.502, 43.666)]
Mean and Range (min, max) of Physical Properties:
Elevation (km): 6051.540 (6051.508, 6051.551)
RMS slope (deg): 1.57 ( 1.40, 1.90)
Fresnel Reflectivity: .114 (.085, .145)
Emissivity: .828 (.819, .840)
Incidence angle (deg): 42.
Smooth and Rough-Surface Diel. Values: 3.7, 5.6
Lat, Long Box: [( 30.418, 30.465), ( 43.495, 43.568)]
Mean and Range (min, max) of Physical Properties:
Elevation (km): 6051.421 (6051.399, 6051.452)
RMS slope (deg): 4.28 ( 3.60, 4.90)
Fresnel Reflectivity: .093 (.080, .100)
Emissivity: .856 (.849, .864)
Incidence angle (deg): 42.
Smooth and Rough-Surface Diel. Values: 3.2, 4.7
Lat, Long Box: [( 30.637, 30.746), ( 43.842, 44.030)]
Mean and Range (min, max) of Physical Properties:
Elevation (km): 6051.493 (6051.484, 6051.504)
RMS slope (deg): 4.62 ( 3.00, 7.40)
Fresnel Reflectivity: .100 (.085, .120)
Emissivity: .846 (.840, .854)
Incidence angle (deg): 42.
Smooth and Rough-Surface Diel. Values: 3.4, 5.0