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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F11%3A10110751%21RIV12-MSM-11310___
rdf:type
skos:Concept n3:Vysledek
dcterms:description
This paper describes the feasibility of mapping snow cover extent by means of time-series of SAR images of the sensor ENVISAT ASAR in the conditions of the Czech Republic. The methodology is based on evaluating a change in absorption of a radar signal in the snow pack due to the liquid water content. Two images with same acquisition geometry are compared: the first one is a reference image acquired under dry snow or snow free conditions, the second one gathered during a snowmelt period. The main objectives were to suggest most suitable conditions for acqui-sition of reference images and to define a threshold value for wet snow classification with respect to a chosen reference image and a type of land cover. Results were compared with maps of snow cover derived from MODIS and MSG data and with data from meteorological stations of the Czech Hydrometeorological Institute (CHMI). The same methodology was also tested on three TerraSAR-X images. The results showed that the most suitable reference image should be acquired under dry snow conditions. The thresholds for detection of wet snow are in general around 0 dB or higher. At the end of melting season with no remaining snow in lowlands it is necessary to mask out areas without snow cover in lower altitude. This paper describes the feasibility of mapping snow cover extent by means of time-series of SAR images of the sensor ENVISAT ASAR in the conditions of the Czech Republic. The methodology is based on evaluating a change in absorption of a radar signal in the snow pack due to the liquid water content. Two images with same acquisition geometry are compared: the first one is a reference image acquired under dry snow or snow free conditions, the second one gathered during a snowmelt period. The main objectives were to suggest most suitable conditions for acqui-sition of reference images and to define a threshold value for wet snow classification with respect to a chosen reference image and a type of land cover. Results were compared with maps of snow cover derived from MODIS and MSG data and with data from meteorological stations of the Czech Hydrometeorological Institute (CHMI). The same methodology was also tested on three TerraSAR-X images. The results showed that the most suitable reference image should be acquired under dry snow conditions. The thresholds for detection of wet snow are in general around 0 dB or higher. At the end of melting season with no remaining snow in lowlands it is necessary to mask out areas without snow cover in lower altitude.
dcterms:title
Snow Cover Mapping Using ENVISAT ASAR Imagery in the Conditions of the Czech Republic Snow Cover Mapping Using ENVISAT ASAR Imagery in the Conditions of the Czech Republic
skos:prefLabel
Snow Cover Mapping Using ENVISAT ASAR Imagery in the Conditions of the Czech Republic Snow Cover Mapping Using ENVISAT ASAR Imagery in the Conditions of the Czech Republic
skos:notation
RIV/00216208:11310/11:10110751!RIV12-MSM-11310___
n3:predkladatel
n4:orjk%3A11310
n5:aktivita
n10:I
n5:aktivity
I
n5:dodaniDat
n17:2012
n5:domaciTvurceVysledku
n20:7457324 n20:7463677 n20:6714854
n5:druhVysledku
n6:D
n5:duvernostUdaju
n16:S
n5:entitaPredkladatele
n12:predkladatel
n5:idSjednocenehoVysledku
230134
n5:idVysledku
RIV/00216208:11310/11:10110751
n5:jazykVysledku
n8:eng
n5:klicovaSlova
ASAR; wet snow; snow cover mapping; Remote sensing
n5:klicoveSlovo
n14:Remote%20sensing n14:wet%20snow n14:ASAR n14:snow%20cover%20mapping
n5:kontrolniKodProRIV
[1519ED8331C8]
n5:mistoKonaniAkce
Praha
n5:mistoVydani
Neuveden
n5:nazevZdroje
Proceedings of the 31st EARSeL Symposium
n5:obor
n19:DE
n5:pocetDomacichTvurcuVysledku
3
n5:pocetTvurcuVysledku
3
n5:rokUplatneniVysledku
n17:2011
n5:tvurceVysledku
Jedlička, Jan Potůčková, Markéta Součková, Jana
n5:typAkce
n13:EUR
n5:zahajeniAkce
2011-05-30+02:00
s:numberOfPages
8
n11:hasPublisher
EARSeL
n18:isbn
978-80-01-04868-9
n21:organizacniJednotka
11310