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Auteur R.L. Huguenin |
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Automated subpixel photobathymetry and water quality mapping / R.L. Huguenin in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 1 (January 2004)
[article]
Titre : Automated subpixel photobathymetry and water quality mapping Type de document : Article/Communication Auteurs : R.L. Huguenin, Auteur ; M.H. Wang, Auteur ; R. Biehl, Auteur ; S. Stoodley, Auteur ; J.N. Rogers, Auteur Année de publication : 2004 Article en page(s) : pp 111 - 123 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] bathymétrie
[Termes IGN] carbone
[Termes IGN] carte thématique
[Termes IGN] chlorophylle
[Termes IGN] classification
[Termes IGN] image Ikonos
[Termes IGN] image multibande
[Termes IGN] lac
[Termes IGN] Massachusetts (Etats-Unis)
[Termes IGN] pollution des eaux
[Termes IGN] précision infrapixellaire
[Termes IGN] profondeur
[Termes IGN] qualité des eaux
[Termes IGN] sédiment
[Termes IGN] turbidité océaniqueRésumé : (Auteur) New photobathymetry and water quality software is described here that utilizes subpixel analysis software (Subpixel Classifier) with an autonomous image calibration procedure and analytic retrieval algorithm to simultaneously retrieve and report bottom depth and the concentrations of suspended chlorophyll, suspended sediments, and colored dissolved organic carbon on a perpixel basis from four-band multispectral image data. From the derived composition, the QSC2 (Quantitative Shoreline Characterization, Version 2.0) software also computes and reports water column visibility parameters (vertical and horizontal subsurface sighting ranges and turbidity, each at four wavelength band passes, plus Secchi depth as a scalar) as well as depth and turbidity confidence. Qsc2 compensates for the effects of the atmosphere, sun and sky reflections from the water surface, subpixel contributions from exposed land, and variations in the bottom material properties. All information is derived automatically from the pixel data alone. The performance of the Qsc2 software was demonstrated using a four-band Ikonos image of Plymouth, Massachusetts. Accuracies of the image-derived compositions, water clarity, and depths were assessed using field and laboratory measurements for eight representative lakes in the scene. The means of the differences of the field-measured and image-derived suspended chlorophyll and colored dissolved organic carbon concentrations for the eight lakes were 1.82 ug/l and 4.34 mgC/1, respectively. The image-derived concentrations of suspended sediments were all below the threshold of detection for the field samples (5 mg/1), in agreement with the field data. The mean of the differences between field-measured and image-derived Secchi depths was 0.76 m. The mean depth difference was 0.57 m. Numéro de notice : A2004-005 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.1.111 En ligne : https://doi.org/10.14358/PERS.70.1.111 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26533
in Photogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 1 (January 2004) . - pp 111 - 123[article]AVIRIS measurements of chlorophyll, suspended minerals, dissolved organic carbon, and turbidity in the Neuse River, North Carolina / M.A. Karaska in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 1 (January 2004)
[article]
Titre : AVIRIS measurements of chlorophyll, suspended minerals, dissolved organic carbon, and turbidity in the Neuse River, North Carolina Type de document : Article/Communication Auteurs : M.A. Karaska, Auteur ; R.L. Huguenin, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 125 - 133 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse en composantes principales
[Termes IGN] Caroline du Nord (Etats-Unis)
[Termes IGN] écosystème
[Termes IGN] eutrophisation
[Termes IGN] image AVIRIS
[Termes IGN] mesure de la qualité
[Termes IGN] milieu aquatique (eau douce)
[Termes IGN] qualité des eaux
[Termes IGN] rivière
[Termes IGN] turbidité des eauxRésumé : (Auteur) Many aquatic ecosystems in the United States and worldwide are impaired by the over-enrichment of waters by nutrients. In advanced stages, the process of eutrophication can cause harmful algae blooms. This research retrieved the concentrations of suspended chlorophyll (Chl), suspended minerals (SM), colored dissolved organic carbon (DOC), and turbidity (total attenuation) from AVIRIS imagery of a severely overenriched waterway in North Carolina, and evaluated if these parameters could be used as indicators of conditions leading to algae blooms. A digital image processing algorithm called Qsc1 (Quantitative Shoreline Characterization, Version 1.0) was used. The retrieved water quality parameter values were tested by statistical comparisons to field measurements made at the time of the AVIRIS data collection. Applying Qsc1 to AVIRIS imagery resulted in measurements of Chl that correlated well with field measurements (r = 0.84). Problems with field sampling prevented the assessment of retrieveSM and Doc. The statistical correlation analysis indicated that, for comparison to remotely sensed data, field measurements in the steadily flowing Neuse River must be collected within two hours of the imagery. Thematic maps of each water quality parameter were generated from the imagery and evaluated. The maps of Chl showed spatial patterns consistent with the field data and circulation of the river, and indicated potential point and non-point sources. Statistical and principle component analyses were used to assess whether the AVIRIS water quality measurements were directly or indirectly related to parameters and conditions indicative of nutrient loading and algae blooms that were measured in the field. The AVIRIS measurements were used to create a new index of eutrophication, the Algae Production Potential Index (Appi), for the purpose of mapping where conditions of high nutrient loading and potential algae blooms exist. The index uses direct measurements of Chl, Doc, and Sm (as a surrogate for phosphate). These measurements are combined in a Gis model based on ecological relationships. Although not field verified, the APPI map shows patterns of algae bloom conditions that are similar in size, scale, and location to previous blooms in the Neuse. Numéro de notice : A2004-006 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.1.125 En ligne : http://dx.doi.org/10.14358/PERS.70.1.125 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26534
in Photogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 1 (January 2004) . - pp 125 - 133[article]