Table 5. Image to Control (values at ground scale)
UTM Coordinates
Space rectangular
Coordinates
Similarity Af fine
Perspective Protective
Image A
X
=
60 m
(30 pts.)
y
=
71
R
=
93
Image C
X
=
66
(11 pts.)
y
=
66
R
=
93
Image B
X
=
64
(15 pts.)
y
=
65
R
=
91
Image D
X
=
64
(14 pts.)
y
=
78
R
101
x = 54 m x
y = 66 y
R = 85 R
x = 62 x
y = 63 y
R = 88 R
x = 55 x
y = 63 y
R = 88 R
x = 55 x
y = 65 y
R = 85 R
32 m
X
=
31 m
32
y
=
31
45
R
=
44
20
X
=
20
20
y
=
20
28
R
=
28
29
X
=
23
25
y
=
24
35
R
=
34
29
X
=
23
29
y
=
23
41
R
=
33
a geologic map and as a prototype 1:100,000-scale image map
of the New Bedford quadrangle.
Selection of RBV Imagery
RBV images were selected covering the proposed map area by
using a Landsat coverage index of North America showing
precise path and row identification numbers with respect
to the geographic location of the map area. These path
and row numbers provide the position of specific MSS
scenes. Four RBV subscenes cover the area of a single MSS
scene and it is desirable to have them taken on a single
exposure date in order to obtain best image uniformity for
the mosaicking. The desired single exposure date was
found to be available for four subscenes having identifi
cation number 830167 - 14444 x A, B, C, D, from path 12
row 31 taken on August 19, 1978. The selected subscenes
were of a "good" quality rating of "8" as based upon the
normal quantitative assessment procedure for Landsat
products. Each subscene also had cloud cover of no more
than 20 percent. These RBV subscenes were ordered from
the Eros Data Center (EDC) as film positive transparencies
having a nominal image size of 7.3 inches square and a
scale of 1:500,000. This particular size provides an
ideal format for image marking and measurement.
Control Materials
Aerial photographs which had been used for a standard
aerotriangulation project in eastern Massachusetts and
Nantucket Island and which have field identified horizontal
control points (State plane rectangular coordinates in
feet) were found to be available from the Eastern Mapping
Center, U.S. Geological Survey. The report included with
this project indicated that there were "no serious
problems" encountered in the fully analytical adjustment
triangulation program. A vector diagram indicated that
adjusted residual errors for all points were under 10 feet.