Full text: ISPRS 4 Symposium

507 
Geometric correction matrices are generated so that EROS 
Data Center may continue to supply fully corrected (re 
sampled) output products in several map projections: 
Universal Transverse Mercator (UTM)/Polar Stereographic or 
Space Oblique Mercator. 
IMAGE FRAMING AND COVERAGE 
The Landsat-4 orbit is 200KM lower than earlier Landsats 
and provides either 7 or 9 day adjacent swath overlap of 
imagery. The 16 day repeat cycle provides 233 orbit paths 
with 248 potential scenes in each. Each scene covers 185KM 
cross-track by 170KM in-track. The center of each scene 
is identified by unique latitude and longitude points as 
part of a Landsat-4 World Reference System (WRS). 
The Landsat-4 WRS is quite different from that of earlier 
Landsats due to the differences in the coverage cycle and 
orbit inclination due to the lower altitude (see Table 3) 
TABLE 3: IMAGE 
FRAMING AND COVERAGE 
COMPARISON 
MEASURE 
LANDSATS 1, 2 & 3 
LANDSAT 4 
ALTITUDE (KILOMETERS) 
914 
705 
PERIOD (MINUTES) 
103 
99 
INCLINATION (DEGREES) 
98.2 
99 
COVERAGE CYCLE DURATION 
(DAYS) 
18 
16 
(REVS) 
251 
233 
DISTANCE BETWEEN ADJACENT 
GROUND TRACKS 
(KILOMETERS) 
159 
172 
(% SIDELAP AT EQUATOR) 
14 
7 
ADJACENT SWATH COVERAGE 
1 OR 17 
7 OR 9 
These differences will be observable by end users as a 
slight rotation between Landsat 1, 2, 3 versus Landsat 4 
imagery, and a difference in geographic coverage of each 
scene. 
The strategy for acquiring data when the spacecraft is not 
within a line-of-sight of a ground station is also different 
between Landsat 4 and earlier Landsats. Landsat 4 was de 
signed to use NASA's Tracking and Data Relay Satellite 
System (TDRSS) to relay data to ground stations, thereby 
eliminating the need for on-board the recorders used on 
Landsats 1, 2, 3. This design change was necessary since 
current state of the art technology in on-board recorders 
cannot support TM data rates. Use of TDRSS is also expect 
ed to increase total system reliability.
	        
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