Muller, J.-P.;
Mandanayake, A.;
Moroney, C.;
Davies, R.;
Diner, D.J.;
Paradise, S.;
(2002)
MISR stereoscopic image matchers: techniques and results.
IEEE Transactions on Geoscience and Remote Sensing
, 40
(7)
pp. 1547-1559.
10.1109/TGRS.2002.801160.
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Abstract
The Multi-angle Imaging SpectroRadiometer (MISR) instrument, launched in December 1999 on the NASA EOS Terra satellite, produces images in the red band at 275-m resolution, over a swath width of 360 km, for the nine camera angles 70.5/spl deg/, 60/spl deg/, 45.6/spl deg/, and 26.1/spl deg/ forward, nadir, and 26.1/spl deg/, 45.6/spl deg/, 60/spl deg/, and 70.5/spl deg/ aft. A set of accurate and fast algorithms was developed for automated stereo matching of cloud features to obtain cloud-top height and motion over the nominal six-year lifetime of the mission. Accuracy and speed requirements necessitated the use of a combination of area-based and feature-based stereo-matchers with only pixel-level acuity. Feature-based techniques are used for cloud motion retrieval with the off-nadir MISR camera views, and the motion is then used to provide a correction to the disparities used to measure cloud-top heights which are derived from the innermost three cameras. Intercomparison with a previously developed "superstereo" matcher shows that the results are very comparable in accuracy with much greater coverage and at ten times the speed. Intercomparison of feature-based and area-based techniques shows that the feature-based techniques are comparable in accuracy at a factor of eight times the speed. An assessment of the accuracy of the area-based matcher for cloud-free scenes demonstrates the accuracy and completeness of the stereo-matcher. This trade-off has resulted in the loss of a reliable quality metric to predict accuracy and a slightly high blunder rate. Examples are shown of the application of the MISR stereo-matchers on several difficult scenes which demonstrate the efficacy of the matching approach.
| Type: | Article |
|---|---|
| Title: | MISR stereoscopic image matchers: techniques and results |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TGRS.2002.801160 |
| Publisher version: | http://dx.doi.org/10.1109/TGRS.2002.801160 |
| Language: | English |
| Additional information: | Published by Institute of Electrical and Electronics Engineers (IEEE) |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/9853 |
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