DMSP Operational Linescan System (OLS) Analog Imagery
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资源简介：
NSIDC archives analog imagery collected by the U. S. Air Force Defense
Meteorological Satellite Program (DMSP). DMSP is a system of
near-polar orbiting satellites providing data in optical and microwave
spectral bands for operational use by the Air Force. The data are
visible-band (0.4 to 0.1 micrometer) and thermal infrared-band (10.5
to 12.5 micrometer) hard-copy positive transparency images.
Frequent global coverage (up to four times daily) has proven useful
for observing changes in snow and ice boundaries on regional to global
scales, as well as for a wide variety of meteorological and cloud
studies. DMSP is the only meteorological satellite program to operate
visible-band sensors at night. Although collected sporadically, there
are large amounts of nighttime imagery, useful for studies of man-made
and natural lighting, and for use in lightning occurrence studies.
The operational scheme consists of two satellites in near-polar
(inclination of 98.7 degrees) sun-synchronous orbits at 450 nautical
miles (825 km) altitude. Orbital period is 102 minutes and the
equatorial node steps around the equator at 25 degree longitude
increments on successive orbits. By use of the two satellites,
observations are made at near local noon and midnight, and at dawn and
dusk. Each satellite carries an operational linescan system (OLS)
which collects data continuously along a cross track scan 1600
nautical miles (3000 km) wide.
The imagery collection at NSIDC consists of three positive
transparency products produced by the Air Force. Currently, the film
collection is being transferred off-site for storage. Limited user
services will be maintained. Custom photographic prints, negatives or
transparencies are available on request. Prints are available from any
size area on original, printed to 8 x 10, 11 x 14, 16 x 20, and 35 mm
slides are also available. Prices are subject to change; a price list
is available on request. On-site use of the collection is by
appointment. Please inquire.
提供机构：
SCIOPS
