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A consideration of attitude jitter on Digital Elevation 
Model (DEM) estimation with EOS—AM1/ASTER Peat 
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K. Arai*, Y.Terayama*, H.Watanabe**, T.Tagawa*** and J.Komai*** TIR x 
* Department of Information Science, Saga University TIR . 
1 Honjo, Saga-city, Saga 840 Japan cool i 
+81-952-24-5191 Ext. 2567, +81-952-24-6010 (FAX) ay 
arai@is. saga-u. ac. jp(E-mail) an b 
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from : 
Abstract 3:dPa 
Theoretical accuracy assessment of This paper briefly describes the ] 
Digital Elevation Model (DEM) to be major characteristics of ASTER then stere« 
derived from Advanced Spaceborne Thermal applicability of DEM derived from ASTER 
Emission and Reflection Radiometer data will be followed. Then with respect 
(ASTER) of EOS-AM1 (Earth Observing to the generation of DEM, the parameters $ Tt 
System-AM1) platform was conducted under will be shown together with reasonable Orient 
the assumption of with/without methods for DEM generation followed by a 
Modulate Transfer Function(MTF) theoretical limitation on the DEM (1) As 
degradation due to sensor motion. As accuracy will be discussed (Ref. 4, 5). i Ster 
the results, it was found that Root Finally the results the from accuracy orient 
Mean Square(RMS) error in terms of DEM assessment with the present baseline of With a 
estimation accuracy was 27.98 m with GCP satellite position and attitude 
for without sensor motion while that accuracy, in particular, attitude 
with random sensor motion of one fifth jitter. 
of Instantanuous Field of View (IFOV), 
0.388  arcsee in terms of standard 
deviation of random motion was 29.21 m. 2. Major characteristics of ASTER 
In the same time MTF degradation due to ASTER is composed with three 
random motion was around 9.5% results in components, VNIR, SWIR and TIR 
about 5% decreasing cross correlation radiometers. Major characteristics of 
between 32 x 32 pixels image chips of VNIR radiometer is shown in Table 1. 
stereo pair. Also it was found that 
matching accuracy was degraded from 0. 85 
to 1.35 pixel. 
VNIR radiometer will have a stereoscopic 
viewing capability with Base Height 
Ratio of 0.6 and also will have a 
pointing capability in cross track 
direction(over -*/- 24 deg.). In addition 
a calibration system with a high stable 
internal lamp source will be installed. 
Although final decision has not been 
made for the dynamic range for each 
band, VNIR radiometer will have a 
variety of application such as 
observation of land/ocean surface, the 
atmosphere, even cloud with an adequate 
noise equivalent reflectance so that a 
gain change will also be capable. 
1. Introduction 
ASTER which is to be carried on the 
EOS-a1 Platform will have 3 bands in the 
visible and near infrared (VNIR) region, 
6 bands in the short wave infrared(SWIR) 
region and 5 bands in the thermal 
infrared (TIR) region with the high 
spatial resolution, 15 m of IFOV for 
VNIR bands, 30 m of IFOV for SWIR bands 
and 90 m of IFOV for TIR bands, 
respectively. On the other hand, VNIR 
radiometer will have stereoscopic SWIR radiometer will have 
capabilities of pointing in the cross 
track direction and gain change. Major 
characteristics are shown in Table 2. 
viewing capability with fore and nadir 
viewing optics with the B/H ratio of 
0. 6. By using this capability, we may 
obtain not only stereoscopic view of By using pointing capability we may 
ours o cover t EOS Put a SG may observe 60 km of swath width within +/- 
igita evation 116 km in the eross track direction. 
Model (DEM) (Ref. 1-3). 
Table 1 Major characteristics of VNIR radiometer 
| 
== 
Wave length regions(um) IFOV : 21. 3urad for nadir viewing 
18. lurad for forward viewing 
Band Center Width NEdR The angle between Nadir/Fore : 29.77 deg. 
Pointing angle in CT : +/-24 deg. 
1 0. 56 0.08 <0.5% IFOV on the ground : 15 m 
2 0. 66 0.06 <0.5% Base Height Ration : 0.6 
3N 9. 81 0.10 «0. 54 Swath width : 60 km 
3F 0.81 0.10 <0.5% Quantization : 8 bit 
  
  
  
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