Siti Mariam Abdul Halim, Muhammad Faiz Pa’suya Green, Rohayu Haron Narashid, Ami Hassan Md Din
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引用次数: 8
摘要
本研究的主要目的是评估来自不同开放数据源的各种全球数字高程模型(GDEM)的精度。使用GNSS地面控制点(GCP)和平均海平面(Hmsl)在沙巴和砂拉越周围的45个基准上对所有gdem进行评估。整体垂直精度显示，terasar - x数字高程测量(TanDEM-X 90m) DEM与快门雷达地形任务(SRTM)、TanDEM-X 90m、ALOS World 3D - 30m (AW3D30)和先进星载热发射与反射辐射计(ASTER)的平均海平面高度均方根误差(RMSE)吻合良好，分别为±4.721m、±3.140m、±4.207 m和±9.412m。然而，AW3D30的垂直精度优于TanDEM-X 90m, RMSE为±3.831m，其次是TanDEM-X 90m DEM、SRTM和ASTER。总体而言，TanDEM-X和AW3D30可以被认为是马来西亚东部(沙巴和沙捞越)科学研究的最佳GDEM。
Accuracy Assessment of TanDEM-X 90 m Digital Elevation Model In East of Malaysia Using GNSS/Levelling
The main objective of this study is to assess the accuracy of various Global Digital Elevation Model (GDEM) from different open sources data. All the GDEMs were evaluated using GNSS Ground Control Point (GCP) and leveling height from mean sea level (Hmsl) at 45 benchmarks around Sabah and Sarawak. The overall vertical accuracy shows the TerraSAR-X add-on for Digital Elevation Measurements (TanDEM-X 90m) DEM consistent well with the Mean Sea Level height with Root mean Square Error (RMSE) of Shutter Radar Topographic Mission (SRTM), TanDEM-X 90m, ALOS World 3D - 30m (AW3D30) and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is ±4.721m, ±3.140m, ±4.207 and ±9.412m, respectively. However, the vertical accuracy for AW3D30 is found better than TanDEM-X 90m with RMSE of ±3.831m, followed by TanDEM-X 90m DEM, SRTM and ASTER when the evaluation is made with orthometric height derived from GNSS GCPs. In overall, TanDEM-X and AW3D30 can be considered the best GDEM for scientific studies in East of Malaysia (Sabah and Sarawak).
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