Accuracy assessment of digital elevation models derived from shuttle radar topography mission (SRTM)
SRTM uydusundan elde edilen sayısal yükseklik modellerinin doğruluk değerlendirmeleri
- Tez No: 183256
- Danışmanlar: DOÇ. DR. GÜRCAN BÜYÜKSALİH
- Tez Türü: Yüksek Lisans
- Konular: Jeodezi ve Fotogrametri, Geodesy and Photogrammetry
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2006
- Dil: İngilizce
- Üniversite: Zonguldak Karaelmas Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Jeodezi ve Fotogrametri Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 115
Özet
Digital elevation models (DEMs) are a basic component of any geo information system (GIS). The terrain can not only be described by the horizontal components; the height belongs to complete information. In addition height models are required for the generation of orthoimages – one of the most often used photogrammetric product. DEMs can be generated by laser scanning, photogrammetric methods or interferometric synthetic aperture radar (InSAR). In any case it is time consuming and expensive. The worldwide lack of qualified and accessible DEMs has been improved with the Shuttle Radar Topography Mission (SRTM) in February 2000. Based on InSAR height models have been generated covering the world from 56° southern up to 60.25° northern latitude. The DEMs based on the US C-band are available free of charge in the internet (http://edcsgs9.cr.usgs.gov/pub/data/srtm/) with a spacing of 3arcsec, corresponding to approximately 92m at the equator. Only for the USA the data with a spacing of arcsec (~30m at the equator) are also in the WEB. The DEMs based on the German / Italian Xband can be ordered from the DLR, Germany with a spacing of 1 arcsec. In the area of Zonguldak, Turkey, C-band and also X-band height models have been investigated.
Özet (Çeviri)
Digital elevation models are a basic component for any GeoInformation system (GIS), they are required for the generation of orthoimages and correct geometric handling of single images. The generation of height models can be based on stereo photogrammetry, laser scanning and interferometric synthetic aperture radar (InSAR). In any case it is time consuming and expensive. With the Shuttle Radar Topography Mission (SRTM) height models have been generated, covering the earth surface from 56° south to 60.25° north. With the exception of small gaps in steep parts, dry sand deserts and water surfaces the free available US C-band data are covering the area completely while the X-band data, distributed by the DLR, are covering it only partially. In the area of ZonguldakSRTM C-band and X-band height models are available together with reference data. The accuracy and accuracy characteristics of the SRTM height models shall be investigated in the Zonguldak area. This shall include the dependency upon terrain coverage by forest, the dependency upon the terrain inclination and aspects. In addition the loss of accuracy by interpolation shall be analysed.
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