CAJ | 학술논문

为了评价不同地貌下国产资源三号测绘卫星DSM数据精度,以云南省高海拔山区为研究案例,并以1:10 000实测地形图DEM为假定真值,以90 m分辨率SRTM DEM为评价参考,从高程精度和地形描述精度两个指标对15 m分辨率的ZY-3 DSM进行精度评价.结果表明:在不同地貌下ZY-3 DSM的高程精度和地形描述精度都优于SRTM DEM.从高程中误差分析来看,台地地貌精度最高,ZY-3 DSM高程中误差仅为SRTM DEM的1/6,平原地貌精度最低,该比值为1/2;就地形描述评价而言,四种地貌下ZY-3 DSM的Et均方根误差实际值与理论值均非常接近,实际值与理论值的比在0.975 2~1.594 3之间,而SRTM DEM在5.310 1~8.749 4之间.由此看来,不同地貌下ZY-3 DSM数据精度整体高于SRTM DEM.
위료평개불동지모하국산자원삼호측회위성DSM수거정도,이운남성고해발산구위연구안례,병이1:10 000실측지형도DEM위가정진치,이90 m분변솔SRTM DEM위평개삼고,종고정정도화지형묘술정도량개지표대15 m분변솔적ZY-3 DSM진행정도평개.결과표명:재불동지모하ZY-3 DSM적고정정도화지형묘술정도도우우SRTM DEM.종고정중오차분석래간,태지지모정도최고,ZY-3 DSM고정중오차부위SRTM DEM적1/6,평원지모정도최저,해비치위1/2;취지형묘술평개이언,사충지모하ZY-3 DSM적Et균방근오차실제치여이론치균비상접근,실제치여이론치적비재0.975 2~1.594 3지간,이SRTM DEM재5.310 1~8.749 4지간.유차간래,불동지모하ZY-3 DSM수거정도정체고우SRTM DEM.
In order to evaluate the accuracy of DSM data of ZY-3 Surveying and Mapping Satellite under different topography, this paper selects ZY-3 DSM data in the high altitude mountain areas,treats the field surveying data DEM and SRTM DEM as reference, and compares the data accuracy with field surveying data in terms of elevation accuracy and accuracy of terrain representation. The results show that , ZY-3 DSM is better than SRTM DEM both in the elevation accuracy and the accuracy of terrain representation,. From the view of the elevation accuracy, different topography has the same conclusion, although the data shows a little difference, and ZY-3 DSM performs the best in the mesa landforms. As for the accuracy of terrain representation, ZY-3 DSM is closer to the theoretical value. Compared to the theoretical value, with its RMS Et actual value , the final ratios are between 0.9572 and 1.5943, while the SRTM DEM are from 5.3101 through 8.7494. In words, the data accuracy of ZY-3 DSM is better than the SRTM DEM in different topography.