Response 
E 
~ Vegetation 
[Ww 
[ \ 
  
  
  
0.3 1 1 3 10 Wavelength, .. m 
Visible Light 
  
  
  
  
  
  
MSS Bands 1 2 3 4 
V AA AA" 
UV | Blue Green Red | Near IR (Reflective) Far IR (Thermal) 
AA AA a a a 
TM Bands 12 3 4 5 7 6 
  
  
FIGURE 9. SPECTRAL REGION SENSING CAPACITY OF LANDSAT-4/5 
MSS AND TIM SENSORS COMPARED TO RESPONSE CURVES 
FOR VEGETATION, SOIL AND WATER 
deployment test was conducted following installation 
of the thermal blanket, and an inspection for 
possible obstructions made at the launch site. Boom 
deployment for Landsat-5 was nominal. 
The Landsat-4 high gain antenna drive generated excessive 
spacecraft disturbance at 2.8 degrees per second slew 
rate. Onboard computers for both Landsats-4 and 5 were 
reprogrammed to operate the antenna at 1.4 degrees per 
second. 
Star tracker operation was disrupted by bright object 
interference. This was corrected for Landsats-4 and 5 by 
closing the star trackers during moon interference 
periods and eliminating stars with bright neighborhoods 
from the star catalog. 
Üne.of the two redundant Central Units (CUs) failed as a 
result of sciíntillation ofa solid state tantalum 
capacitor.: This scintillation:caused:the CU ta execute 
spurious commands. It also caused the switching 
transistors: to fall, disabling tne CU. Thetresulting 
Landsat-5 enhancement replaced tantalum capacitors in 
these two critical areas with ceramic capacitors. 
The Landsat-4 wideband communication module X-band system 
failed due to cracks which developed in the frequency 
source power amplifier substrates over a period of 1500 
to 3500 hours of operation. . For Landsat-4, the failure 
517