COMPARISON OF ASTER AND SRTM DIGITAL ELEVATION MODELS AT ONE-ARC-SECOND RESOLUTION OVER TURKEY

Abstract

In February 2000, the “Shuttle Radar Topography Mission (SRTM)” satellite captured elevation data by scanning the Earth landmasses between the 60o North and South latitudes. After the mission of 11 days, the collected data were processed, and a Digital Elevation Model (DEM) within one arc-second resolution for United States and three arc-second resolutions for the other parts of the globe was created and published on the NASA servers. Recently, a global SRTM DEM with one-arc-second resolution has been released. Additionally, ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) is a sensor boarded on the Terra satellite in 1999. The sensor has been collecting satellite imagery since 2000. The ASTER GDEM at one-second resolution was released to the public, which is the most complete DEM of the earth ever made. In this study, SRTM and ASTER DEMs with one arc-second resolution over Turkish territory was evaluated by means of a local DEM produced from 1:25K national topographic maps. Results show that the accuracy of the SRTM DEM is better than the ASTER GDEM with respect to the local DEM.

Keywords

• ASTER GDEM
• Evaluation
• Digital elevation model
• SRTM

1 Saniye Çözünürlüklü ASTER ve SRTM Sayısal Yükseklik Modellerinin Türkiye’de Karşılaştırması

Öz

2000 yılında SRTM (Shuttle Radar Topography Mission) uydusu yeryüzünü 60o kuzey ve güney enlemleri arasını tarayarak yükseklik bilgisi elde etmiştir. 11 günlük görevinden sonra toplanan veriler işlenmiş ve ABD için 1 saniye diğer ülkeler için 3 saniye çözünürlükte olmak üzere bir Sayısal Yükseklik Bilgisi üretilmiş ve NASA sunucularında yayınlanmıştır. Son zamanlarda 1 saniye çözünürlüklü global SRTM SYM yayınlanmaya başlamıştır. Ayrıca, ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) Terra uydusuna 1999 yılında montelenmiş bir algılayıcıdır. Bu algılayıcı 2000 yılından beri uydu görüntüsü toplamaktadır. 1 saniye çözünürlüklü ASTER SYM dünyanın en geniş kapsamlı SYM’si olup kullanıma açılmıştır. Bu çalışmada 1 saniye çözünürlüklü ASTER ve SRTM SYM’ler Türkiye’de 1:25 000 ölçekli topografik haritalarda türetilen yerel SYM ile değerlendirilmiştir. Sonuçlar, SRTM SYM’nin ASTER SYM’ye göre daha iyi olduğunu göstermektedir.

Anahtar Kelimeler

• ASTER SYM
• Değerlendirme
• Sayısal yükseklik modeli

Kaynakça

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