BATHYMETRIC EXTRACTION USING WORLDVIEW-2 HIGH RESOLUTION IMAGES
The fundamental principle underlying the methods used to extract bathymetric information from remote-sensed imagery is that different wavelengths of the solar light penetrate the water body to different depths. In order to extract bathymetric values from multispectral satellite imagery we implemente...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2012-07-01
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| Series: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B8/153/2012/isprsarchives-XXXIX-B8-153-2012.pdf |
| Summary: | The fundamental principle underlying the methods used to extract bathymetric information from remote-sensed imagery is that
different wavelengths of the solar light penetrate the water body to different depths. In order to extract bathymetric values from
multispectral satellite imagery we implemented the Jupp method (Jupp, 1988), in IDL language and integrated it in the ENVI menu
structure. In this experiment we apply this method to two images of the Poetto beach in Cagliari (Sardinia, Italy) acquired from the
new-generation WorldView-2 sensor. Launched in October 2009, the WorldView-2 sensor provides, among others, one (named
Coastal) that was designed specifically for this kind of analysis; we chose to use the Coastal band in place of the Blue one when
applying the model. The images (a stereoscopic pair) were acquired on June 17, 2011. The 5419 scene was pre-processed in order to
separate the sea bottom classes. This class was then georeferenced to overlap on the 5318 scene. A traditional bathymetric survey
was performed, up to 1,50 m, planned and carried out in order to calibrate the model. For each scene, 10 calibration areas were
selected, and for each of them a digital model of the sea bottom was generated. Precision and accuracy of the method were evaluated
by analyzing the results extracted from the stereo-pairs and by examining the correlation between the surveyed depth values and the
calculated ones, between the different models calculated from the same scene using different calibration areas, and between the
models obtained from the two images. |
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| ISSN: | 1682-1750 2194-9034 |