USGS

Venus Mapping White Paper

Open-File Report 95-519


Table 2

Example Venus geologic map data tables.

[Values for these three sites were obtained using the mgn_data and anc_data programs, whose output is presented in app. 1 and 2. The first table presents information on image location, pixel scale (), number of pixels used in the backscatter calculation (N), range of incidence angles, and radius. The second table provides the backscatter and physical properties data: backscatter cross section (), rms slope (), Fresnel reflectivity (), emissivity, and calculated dielectric constants for the smooth-surface (s) and rough-surface (r) cases discussed in the text. Note that latitude, longitude boundaries are listed in both the body of the unit description and here. For the backscatter cross section, values in parentheses represent the value (in dB) at plus and minus one standard deviation. For all other data, values in parentheses represent the minimum and maximum values of each parameter within the chosen sample box. The number of significant digits used for each value are reasonable guides to their accuracy]

Unit
Lat
Long
N
Angle (deg)
Radius (range) in km
p1
30.863-30.999 N
43.502-43.666 E
225 m
4290
41.7-41.8
6051.540 (6051.508, 6051.551)
f1
30.418-30.465 N
43.495-43.568 E
225 m
690
41.9-41.9
6051.421 (6051.399, 6051.452)
f2
30.637-30.746 N
43.842-44.030 E
225 m
3952
41.8-41.9
6051.493 (6051.484, 6051.504)


Unit
(dB)
(deg)
Fresnel
Emissivity
s, r
p1
-18.14 (-19.40, -17.17)
1.6 (1.4, 1.9)
0.114 (0.085, 0.145)
0.828 (0.819, 0.840)
3.7, 5.6
f1
-7.80 (-8.91, -6.91)
4.3 (3.6, 4.9)
0.093 (0.080, 0.100)
0.856 (0.849, 0.864)
3.2, 4.7
f2
-11.20 (-12.52, -10.19)
4.6 (3.0, 7.4)
0.100 (0.085, 0.120)
0.846 (0.840, 0.854)
3.4, 5.0