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Title: Further development of airborne remote sensing techniques;
Author: Bottrell H
Author: G Moore: S Lavender J Aiken
Author: Environment Agency
Document Type: Monograph
Annotation: Environment Agency Project ID:EAPRJOUT_219, Representation ID: 28, Object ID: 1566
Abstract:
This is the fourth report to the Environment Agency (the Agency), formerly the National Rivers Authority) under the contract with the Natural Environment Research Council’s Plymouth Marine Laboratory (NERC, PML) -entitled: “Further development of airborne remote sensing techniques”. The tasks for PML under this contract, were the development of novel methods for the improved interpretation of airborne remote sensing by Compact Airborne Spectrographic Imager (CASI) a relatively new instrument having high radiometric sensitivity, optimised for low-level water leaving radiances, high spectral resolution (1.8 nm) and broad spectral range (400 - 900 run). Essentially, these special features of CASI required the development of new techniques and new algorithms to interpret the imagery with maximum precision and exploit the sensor capabilities to the full. Most significantly,with high radiometric sensitivity, in the near infrared NIR:(700 - 900 nm), atmospheric correction of the measured radiances over water would be possible, provided new procedures could be developed. This fourth report has demonstrated that atmospheric correction, using the novel algorithms and the software developed at PML, is a valid methodology for both Case 1 and Case 2 waters. Many CASI images from diverse coastal environments (Humber: Plymouth, Aberdovey) have been analysed which, after atmospheric correction, show good discrimination of Case 1 and Case 2 waters, show in-water features which are not apparent in uncorrected imagery and which are interpretable in relation to the hydrography of the area, show that the correction process gives very similar water-leaving radiance values for simultaneous different height flights, and provides derived SPM and chlorophyll concentrations which are in close agreement with contemporaneously measured in situ values of SPlM and chlorophyll. These achievements now make possible the quantitative study of coastal waters by remote sensing:an hitherto intractable problem.
Publisher: Environment Agency
Subject Keywords: LakesRiversEstuariesCoastal watersEnvironmental managementRemote sensingBrackishwater environmentMarine ecologyFreshwater ecology
Geographic Keywords: British IslesEngland
Extent: 24
Permalink: http://www.environmentdata.org/archive/ealit:4321
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