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Proceedings International Workshop on Mobile Mapping Technology
Li, Rongxing

Generation of Digital Elevation Model derived from JERS1 SAR Interferometry
Mitsuharu TOKUNAGA
Institute of Industrial Science, University of Tokyo
7-22-1, Roppongi, Minatoku, Tokyo 106, Japan
TEL:+81-3-3402-6231 ext.2564
FAX: +81-3-3402-6231
Email: toku@shunji.iis.u-tokyo.ac.jp
This paper presents the DTM accuracy derived from JERS-1 SAR Interferometry based on the branch cut method.
The target area were selected FUJI and FUGEN mountain in the volcanic mountaions. The accuracy of the calculated
DTM is that maximum error and R.M.S.E were 217m, and 27.7m respectively. The accuracy weren’t better than
theoretical values, but it is regarded as the next factor.
(1) satellite position and orientations (2) precision of geometric correction (3) phase unwrapping algorithm
In this paper, the one of DTM accuracy derived from JERS-1 SAR Interferometry made clear.
The high accuracy Digital Terrain Model (DTM) has
been required for the wide field of geoinfomatics,
monitoring for environment and GIS. The trend will
become strong because the high resolution satellite data
will be available right away. Now, some method of
approach for DTM generation are proposed. For
example, the stereo matching using optical data or
synthetic aperture radar (SAR) data, SAR
interferometry, laser profile and so on are there.
Recently, many articles about Interferometry SAR
(InSAR) has been published. Because the potentials of
InSAR has been proved in many fields, as DTM
generation, glacier analysis, the earth crust change.
Especially, InSAR is provided the high accuracy DTM
that couldn’t derived from the others remote sensing
However, the majority report is to develop the
algorithm and to be calculated the fringe data. Few
report is evaluated the DTM.
In this study, the comparison DTM derived from
interferometry SAR with DTM made from topographic
map was carried out in order to clear the accuracy.
The Figure 1 shows the geometry of Interferometry
B : Baseline between two SAR antenna.
a : inclination angle of baseline
0 : incident angle of radar
R1,R2 : the length of slant range
H : the height of Satellite 1 from surface of the earth
h : the elevation value of target point
The difference of the slant length of SAR 1 and SAR 2
is approximated the next equation.
R2- R\ = Bs\n(0-a)
Also, the relation of difference of phase and elevation
value shows the nest equation.
(f) = 4kBs\x\(6- a) I A.
A.: the wave length of radar
Then, the elevation values are calculated by the