Review article

Vertical Accuracy Evaluation of Digital Terrain Model (DTM) ALOS PALSAR-2 in Rote Dead Sea Area – Indonesia

Atriyon Julzarika ; Department of Geodetic Engineering, Gadjah Mada University, Yogyakarta, Indonesia
Trias Aditya ; Department of Geodetic Engineering, Gadjah Mada University, Yogyakarta, Indonesia
Subaryono Subaryono ; Department of Geodetic Engineering, Gadjah Mada University, Yogyakarta, Indonesia
Harintaka Harintaka ; Department of Geodetic Engineering, Gadjah Mada University, Yogyakarta, Indonesia

Abstract

Vertical accuracy evaluation is essential to determine in order to know the quality of a DTM. This quality will affect the scale type and utilization of the DTM. The study data use DTM ALOS PALSAR-2. This study evaluates the vertical accuracy of the DTM ALOS PALSAR-2 with different height reference fields in the Rote Dead Sea Area, Indonesia. Each DTM is made with the EGM 1996, EGM 2008, and WGM 2012. The three DTMs extracted based on the height reference field will have different orthometric heights; therefore, an evaluation of the vertical accuracy is needed to determine the quality of the three DTMs. They compare with field measurements from GNSS-levelling. This test is carried out at lowland and highland, using 10 test points. For the lowland area, the RMSE (z) in height at DTM is 1.363 m for WGM 2012, 2.017 m for EGM 2008, and 1.934 m for EGM 1996. For the highlands area, the RMSE (z) in height at DTM is 1.185 m for WGM 2012, 1.201 m for EGM 2008, and 1.432 m for EGM 1996. The DTM-WGM 2012 and DTM-EGM 1996 are recommended to use in this area because they have higher vertical accuracy. The vertical accuracy test in the Rote lowland corresponds to class 2 and class 3 on a scale of 1:10,000. The vertical accuracy test results in the Rote highland correspond to class 1 and class 2 on a scale of 1:10,000. The ALOS PALSAR-2 DTM vertical accuracy test results can be used for mapping scales of 1:10,000 – 1:25,000 in Rote.

Keywords

vertical accuracy test; EGM 1996; EGM 2008; WGM 2012; DTM ALOS PALSAR-2

Hrčak ID:

254554

URI

https://hrcak.srce.hr/254554

Publication date:

25.3.2021.

Article data in other languages: croatian

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