A water index for SPOT5 HRG satellite imagery, New South Wales, Australia, determined by linear discriminant analysis

Fisher, Adrian and Danaher, Tim (2013) A water index for SPOT5 HRG satellite imagery, New South Wales, Australia, determined by linear discriminant analysis. Remote Sensing, 5 11: 5907-5925. doi:10.3390/rs5115907

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Author Fisher, Adrian
Danaher, Tim
Title A water index for SPOT5 HRG satellite imagery, New South Wales, Australia, determined by linear discriminant analysis
Journal name Remote Sensing   Check publisher's open access policy
ISSN 2072-4292
Publication date 2013-11
Sub-type Article (original research)
DOI 10.3390/rs5115907
Open Access Status DOI
Volume 5
Issue 11
Start page 5907
End page 5925
Total pages 19
Place of publication Basel, Switzerland
Publisher M D P I AG
Collection year 2014
Language eng
Abstract A new water index for SPOT5 High Resolution Geometrical (HRG) imagery normalized to surface reflectance, called the linear discriminant analysis water index (LDAWI), was created using training data from New South Wales (NSW), Australia and the multivariate statistical method of linear discriminant analysis classification. The index uses all four image bands, and is better at separating water and non-water pixels than the two commonly used variations of the normalized difference water index (NDWI), which each only use two image bands. Compared across 2,400 validation pixels, from six images spanning four years, the LDAWI attained an overall accuracy of 98%, a producer’s accuracy for water of 100%, and a user’s accuracy for water of 97%. These accuracy measures increase to 99%, 100% and 98% if cloud shadow and topographic shadow masks are applied to the imagery. The NDWI achieved consistently lower accuracies, with the NDWI calculated from the green and shortwave infrared (IR) bands performing slightly better (91% overall accuracy) than the NDWI calculated from the green and near IR bands (89% overall accuracy). The LDAWI is now being routinely used on an archive of over 2,000 images from across NSW, as part of an operational environmental monitoring program.
Keyword SPOT5 HRG
Water
Linear discriminant analysis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
Official 2014 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 19 Jan 2014, 00:06:39 EST by System User on behalf of School of Geography, Planning & Env Management