Radar System Engineering

SEC. 3.16] CITIES 107
portion of New York City in which immediate identification is possible
by reference to the Hackensack, Hudson, Harlem, and East Rivers,
together with Central Park andthe various bridges.
It is sometimes possible to discern a few prominent features of the
street pattern of a city. A complete presentation of the street pattern
would be ideal, but present radar equipment lacks the resolution which
N
FIG. 3.32.—Obihiro, Hokkaido, Wavelength = 3.2cm, 3° beam, altitude 12,000ft, radius
15nauticalmi. 42”41’N. 143”12’E.
would rnakethispossible. At very lowaltitudes and very short ranges,
major thoroughfares may occasionally be seen asdarklines in the bright
mass of city return. There is some evidence of the hIanhattan street
pattern near the center of Fig. 335. Airport runways, which are
normally much wider than streets, can often be seen clearly at low altitudes,
M in Fig. 3.21. On the other hand, the concentration of large
buildings along major streets and the presence of elevated railways or