Abstract
Abstract. The Ziyuan-3 (ZY-3) satellite, as the first civilian high resolution surveying and mapping satellite in China, has a very important role in national 1 : 50,000 stereo mapping project. High accuracy digital surface Model (DSMs) can be generated from the three line-array images of ZY-3, and ZY-3 DSMs of China can be produced without using any ground control points (GCPs) by selecting SRTM (Shuttle Radar Topography Mission) and ICESat/GLAS (Ice, Cloud, and land Elevation Satellite, Geo-science Laser Altimeter System) as the datum reference in the Satellite Surveying and Mapping Application Center, which is the key institute that manages and distributes ZY-3 products. To conduct the vertical accuracy evaluation of ZY-3 DSMs of China, three representative regions were chosen and the results were compared to ICESat/GLAS data. The experimental results demonstrated that the root mean square error (RMSE) elevation accuracy of the ZY-3 DSMs was better than 5.0 m, and it even reached to less than 2.5 m in the second region of eastern China. While this work presents preliminary results, it is an important reference for expanding the application of ZY-3 satellite imagery to widespread regions. And the satellite laser altimetry data can be used as referenced data for wide-area DSM evaluation.
Highlights
Digital surface model (DSMs) plays a very important role in many fields including hydrology, disaster monitoring, terrain analysis, and so forth
The DSMs were generated from ZY-3 three line-array images without any ground control points (GCPs) but were referenced to SRTM-digital elevation models (DEMs) data, and the interval was interpolated to 15 m with reference to WGS84+EGM96 as height datum
The ICESat/GLAS data were derived from GLA14 products collected between 2003 to 2009 according to the selection criteria described in Subsection2.2 .In order to ensure the elevation accuracy of selected GLAS points, the criterion of the fitting standard deviation in Eq (6) was fixed as 3.2 ns, and the results for GLAS points will be better than 1.0 m theoretically in the vertical direction
Summary
Digital surface model (DSMs) plays a very important role in many fields including hydrology, disaster monitoring, terrain analysis, and so forth. The main objective of ZY-3 is to obtain high resolution stereo images and generate national 1:50,000 digital elevation models (DEMs) and digital ortho maps (DOMs). The ZY-3 DSMs of China are derived from ZY-3 stereo images without ground control points (GCPs) and cover the entire country with a 15 m interval grid; WGS84+EGM96 is used as height reference datum. The preliminary vertical accuracy in three regions was evaluated by comparing the results to select GLAS (Geo-science Laser Altimeter System) data loaded into the ICESat (Ice, Cloud, and land Elevation Satellite) dataset and some high accuracy GCPs; ICESat was launched in 2003 and ended its mission in 2009, and during this time, it obtained global high accuracy height data spaced at 170 m along the tracks and 5–185 km across the tracks (Schutz, B.E,et al ,2005; Wang, X.et al,2011; Zwally, H.J.,et al,2002)
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