About: Snow Cover Mapping Using ENVISAT ASAR Imagery in the Conditions of the Czech Republic

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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. (en)
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 (en)
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 (en)
skos:notation	RIV/00216208:11310/11:10110751!RIV12-MSM-11310___
http://linked.open...avai/riv/aktivita	I
http://linked.open...avai/riv/aktivity	I
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Potůčková, Markéta Součková, Jana Jedlička, Jan
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	230134
http://linked.open...ai/riv/idVysledku	RIV/00216208:11310/11:10110751
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	ASAR; wet snow; snow cover mapping; Remote sensing (en)
http://linked.open.../riv/klicoveSlovo	ASAR snow cover mapping wet snow Remote sensing
http://linked.open...ontrolniKodProRIV	[1519ED8331C8]
http://linked.open...v/mistoKonaniAkce	Praha
http://linked.open...i/riv/mistoVydani	Neuveden
http://linked.open...i/riv/nazevZdroje	Proceedings of the 31st EARSeL Symposium
http://linked.open...in/vavai/riv/obor	DE
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...UplatneniVysledku	2011
http://linked.open...iv/tvurceVysledku	Potůčková, Markéta Jedlička, Jan Součková, Jana
http://linked.open...vavai/riv/typAkce	EUR - Evropská
http://linked.open.../riv/zahajeniAkce	2011-05-30 (xsd:date)
number of pages	8 (xsd:int)
http://purl.org/ne...btex#hasPublisher	EARSeL
https://schema.org/isbn	978-80-01-04868-9
http://localhost/t...ganizacniJednotka	11310

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