Assessment of the accuracy of SRTM C- and X-Band high mountain elevation data : a case study of the Polish Tatra Mountains

2014
journal article
article
63
dc.abstract.enGlobal digital elevation models (DEMs) are an invaluable source of information in large area studies. Of particular interest are shuttle radar topography mission (SRTM) data that are freely available for the scientific community worldwide. Prior to any application, global datasets should be evaluated using reference data of higher accuracy. Therefore, the main objective of this study was to assess the accuracy of the SRTM C-band (version 4) DEM and SRTM X-band DEM of mountainous areas located in Poland and to examine the quality of data in relation to topographic parameters, radar beam geometry, initial voids in data and the presence of forest cover. A DEM from the Central National Geodetic and Cartographic Inventory, Poland, served as a reference. The study consisted of three steps: (i) the computation of vertical errors of the SRTM C- and X-band DEMs, (ii) the examination of any systematic bias in the data, and (iii) the analysis of the relationships between the elevation errors and terrain slope, aspect, local incidence angle, occurrence of voids and land cover. We found that the SRTM C- and X-band DEMs have mean errors equal to 4.31 ± 14.09 and 9.03 ± 37.40 m and root mean square errors equal to 14.74 and 38.47 m, respectively. Only 82 \% of the C-band DEM and 74 \% of the X-band DEM vertical errors had absolute values below 16 m. We found that the most important factors determining the occurrence of high errors were the distribution of initial voids and high slope angles for the C-band DEM, and local incidence angle, slope, aspect and radar beam geometry for the X-band DEM. In both cases, the presence of forest cover increased the mean error by approximately 10 m.pl
dc.affiliationWydział Biologii i Nauk o Ziemi : Instytut Geografii i Gospodarki Przestrzennejpl
dc.contributor.authorKolecka, Natalia - 160849 pl
dc.contributor.authorKozak, Jacek - 129324 pl
dc.date.accessioned2015-02-24T13:57:23Z
dc.date.available2015-02-24T13:57:23Z
dc.date.issued2014pl
dc.description.number6pl
dc.description.physical897-912pl
dc.description.volume171pl
dc.identifier.doi10.1007/s00024-013-0695-5pl
dc.identifier.eissn1420-9136pl
dc.identifier.issn0033-4553pl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/3295
dc.languageengpl
dc.language.containerengpl
dc.rights.licencebez licencji
dc.subject.enSRTMpl
dc.subject.enaccuracy assessmentpl
dc.subject.endigital elevation modelpl
dc.subject.enhigh mountain areapl
dc.subtypeArticlepl
dc.titleAssessment of the accuracy of SRTM C- and X-Band high mountain elevation data : a case study of the Polish Tatra Mountainspl
dc.title.journalPure and Applied Geophysicspl
dc.typeJournalArticlepl
dspace.entity.typePublication
dc.abstract.enpl
Global digital elevation models (DEMs) are an invaluable source of information in large area studies. Of particular interest are shuttle radar topography mission (SRTM) data that are freely available for the scientific community worldwide. Prior to any application, global datasets should be evaluated using reference data of higher accuracy. Therefore, the main objective of this study was to assess the accuracy of the SRTM C-band (version 4) DEM and SRTM X-band DEM of mountainous areas located in Poland and to examine the quality of data in relation to topographic parameters, radar beam geometry, initial voids in data and the presence of forest cover. A DEM from the Central National Geodetic and Cartographic Inventory, Poland, served as a reference. The study consisted of three steps: (i) the computation of vertical errors of the SRTM C- and X-band DEMs, (ii) the examination of any systematic bias in the data, and (iii) the analysis of the relationships between the elevation errors and terrain slope, aspect, local incidence angle, occurrence of voids and land cover. We found that the SRTM C- and X-band DEMs have mean errors equal to 4.31 ± 14.09 and 9.03 ± 37.40 m and root mean square errors equal to 14.74 and 38.47 m, respectively. Only 82 \% of the C-band DEM and 74 \% of the X-band DEM vertical errors had absolute values below 16 m. We found that the most important factors determining the occurrence of high errors were the distribution of initial voids and high slope angles for the C-band DEM, and local incidence angle, slope, aspect and radar beam geometry for the X-band DEM. In both cases, the presence of forest cover increased the mean error by approximately 10 m.
dc.affiliationpl
Wydział Biologii i Nauk o Ziemi : Instytut Geografii i Gospodarki Przestrzennej
dc.contributor.authorpl
Kolecka, Natalia - 160849
dc.contributor.authorpl
Kozak, Jacek - 129324
dc.date.accessioned
2015-02-24T13:57:23Z
dc.date.available
2015-02-24T13:57:23Z
dc.date.issuedpl
2014
dc.description.numberpl
6
dc.description.physicalpl
897-912
dc.description.volumepl
171
dc.identifier.doipl
10.1007/s00024-013-0695-5
dc.identifier.eissnpl
1420-9136
dc.identifier.issnpl
0033-4553
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/3295
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights.licence
bez licencji
dc.subject.enpl
SRTM
dc.subject.enpl
accuracy assessment
dc.subject.enpl
digital elevation model
dc.subject.enpl
high mountain area
dc.subtypepl
Article
dc.titlepl
Assessment of the accuracy of SRTM C- and X-Band high mountain elevation data : a case study of the Polish Tatra Mountains
dc.title.journalpl
Pure and Applied Geophysics
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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