| 摘要: |
| 在保证海岸带区域控制点均匀分布的基础上，对3景SPOT-5影像分别使用1∶5万DEM和SRTM90m数据，开展6个、9个、12个控制点的影像正射校正。结果表明：在海岸带区域，基于传感器物理模型的1景SPOT-5影像正射校正，6个控制点即可保证较高的精度，控制点数量的增多对精度的提高并不显著；1∶5万DEM比SRTM90m数据对影像的正射校正精度略高，但并不明显，在缺少1∶5万DEM时，用SRTM90m数据代替亦能满足908课题的精度要求，进一步验证了SRTM90m数据在高分辨率遥感影像正射校正中的可用性。 |
| 关键词: 海岛海岸带 控制点数量 DEM分辨率 SPOT-5影像 |
| DOI： |
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| 基金项目:国家海洋局908专项项目（908-01-WY02，908-01-WY06） |
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| Influence of GCP quantity and DEM resolution on orthorectification precision of remote sensing image |
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| Abstract: |
| According to the characteristic of island and costal zone, choosing standard, quantity and distribution of GCPs(ground control points) are designed based on measuring demand and image character. RBN/DGPs is chosen for measuring GCPs, and then the images are corrected based on different DEMs and different quantities of GCPs. There is a conclusion by analyzing the results of correction. Using SPOT-5 physical model, 6 GCPs can get a high correction precision and more controls can not get a notable improvement of precision. DEM of 1∶50 000 is little better than SRTM90m for image correction, but it is not obvious, and when there is no DEM of 1∶50 000, SRTM90m can replace it. The conclusions above provide the basis of choosing optimal quantity of GCPs and appropriate resolution of DEM for image correction. |
| Key words: island and costal zone ground control points(GCP) quantity DEM resolution SPOT-5 image |
