Arctic Shoreline Delineation & Feature Detection Using RADARSAT-1 Interferometry: Case Study Over Alert

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Authors
  1. Mattar, K.E.
  2. Gallop, L.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
Extensive ground truth carried out in and around Alert in 2002 permitting testing the geometric calibration of RADARSAT-1, optimizing the capability of RADARSAT-1 interferometry to delineate coastlines and riverbeds in an Arctic environment, and investigating the detection of various targets and features of potential interest. Surveyed corner reflectors helped demonstrate that a ground reference point greatly improves the geometric calibration of RADARSAT-1 images. A new coherence filter was developed specifically optimized for coastline and riverbed delineation. GPS surveyed coastlines, mapped into radar perspective and calibrated using the surveyed corner reflectors, deviated from the coastline delineated using the coherence filter by less than 8 meters on average. Furthermore, assuming low decorrelation effects, coastlines and riverbeds are often clearly visible in the coherence image, potentially lending the delineation process much more readily to automation. However, RADARSAT-1’s fine resolution mode proved too coarse to reliably detect roads, three crashed airplanes and various monuments in the area.

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Keywords
Interferometric SAR;Coastline delineation;Riverbed delineation;Coherence filter;Image extraction;RADARSAT;Radar imagery;Shoreline delineation;Shoreline vector extraction
Report Number
DRDC-OTTAWA-TR-2003-225 — Technical Report
Date of publication
01 Dec 2003
Number of Pages
50
DSTKIM No
CA023480
CANDIS No
520801
Format(s):
Hardcopy;CD ROM

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