EXPERIMENTAL DEM EXTRACTION FROM ASTER STEREO PAIRS AND 3D REGISTRATION BASED ON ICESAT LASER ALTIMETRY DATA IN UPSTREAM AREA OF LAMBERT GLACIER, ANTARCTICA
DEM Extraction from ASTER stereo pairs and three-dimensional registration by reference to ICESat laser altimetry data are carried out in upstream area of Lambert Glacier, East Antarctica. Since the study area is located in inland of East Antarctica where few textures exist, registration between DE...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2017-09-01
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| Series: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-2-W7/1517/2017/isprs-archives-XLII-2-W7-1517-2017.pdf |
| Summary: | DEM Extraction from ASTER stereo pairs and three-dimensional registration by reference to ICESat laser altimetry data are carried
out in upstream area of Lambert Glacier, East Antarctica. Since the study area is located in inland of East Antarctica where few
textures exist, registration between DEM and ICESat data is performed. Firstly, the ASTER DEM generation is based on rational
function model (RFM) and the procedure includes: a) rational polynomial coefficient (RPC) computation from ASTER metadata, b)
L1A image product de-noise and destriping, c) local histogram equalization and matching, d) artificial collection of tie points and
bundle adjustment, and e) coarse-to-fine hierarchical matching of five levels and grid matching. The matching results are filtered
semi-automatically. Hereafter, DEM is interpolated using spline method with ground points converted from matching points.
Secondly, the generated ASTER DEM is registered to ICESat data in three-dimensional space after Least-squares rigid
transformation using singular value decomposition (SVD). The process is stated as: a) correspondence selection of terrain feature
points from ICESat and DEM profiles, b) rigid transformation of generated ASTER DEM using selected feature correspondences
based on least squares technique. The registration shows a good result that the elevation difference between DEM and ICESat data is
low with a mean value less than 2 meters and the standard deviation around 7 meters. This DEM is generated and specially registered
in Antarctic typical region without obvious ground rock control points and serves as true terrain input for further radar altimetry
simulation. |
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| ISSN: | 1682-1750 2194-9034 |