SNOW COVER DETERMINATION FROM ENVISAT ASAR: A CASE STUDY FROM THE CZECH REPUBLIC

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

SNOW COVER DETERMINATION FROM ENVISAT ASAR: A CASE STUDY FROM THE CZECH REPUBLIC

Popis výsledku v původním jazyce

The paper describes results of a case study on snow cover area monitoring in the Czech Republic from ENVISAT ASAR WSM data. The investigation is a part of the ESA FLOREO project. The methodology is based on comparison of two SAR images, a reference, snow-free image, and an image with snow acquired in melting period. A threshold value of -3db is usually advised for discrimination of wet snow. This threshold underestimates SCA when applied on the whole territory of the CR especially due to heterogeneity of land cover. New approaches for deriving new threshold fitting to the local conditions are investigated; one is based on observations of snow height from meteorological stations and the other uses results of classification of optical data. The results of processing of 10 pairs of ASAR WSM images showed that further investigation has to be carried out to determinate specific threshold values for snow classification for each land cover class.

Název v anglickém jazyce

SNOW COVER DETERMINATION FROM ENVISAT ASAR: A CASE STUDY FROM THE CZECH REPUBLIC

Popis výsledku anglicky

The paper describes results of a case study on snow cover area monitoring in the Czech Republic from ENVISAT ASAR WSM data. The investigation is a part of the ESA FLOREO project. The methodology is based on comparison of two SAR images, a reference, snow-free image, and an image with snow acquired in melting period. A threshold value of -3db is usually advised for discrimination of wet snow. This threshold underestimates SCA when applied on the whole territory of the CR especially due to heterogeneity of land cover. New approaches for deriving new threshold fitting to the local conditions are investigated; one is based on observations of snow height from meteorological stations and the other uses results of classification of optical data. The results of processing of 10 pairs of ASAR WSM images showed that further investigation has to be carried out to determinate specific threshold values for snow classification for each land cover class.

Druh

D - Stať ve sborníku

CEP obor

DE - Zemský magnetismus, geodesie, geografie

OECD FORD obor

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Projekt

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Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2010

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of ESA Living Planet Symposium

ISBN

978-92-9221-250-6

ISSN

1609-042X

e-ISSN

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Počet stran výsledku

8

Strana od-do

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Název nakladatele

ESA Communications ESTEC

Místo vydání

Noordwijk, The Netherlands

Místo konání akce

Bergen

Datum konání akce

28. 6. 2010

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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