基于KH-9数据对青藏高原山地冰川DEM提取及精度评价——以普若岗日冰川和雅弄冰川为例

针对青藏高原山地冰川区早期DEM数据缺乏、精度低、覆盖范围小等问题，以普若岗日冰川和雅弄冰川为例，利用解密的早期高分辨率间谍卫星KH-9立体像对，建立了基于KH-9数据的山地冰川DEM提取技术流程，并以ICESat GLAS高程数据为基准对提取的DEM进行了精度评价和精度影响分析。结果表明：无论是在普若岗日冰川区还是雅弄冰川区，所获取的DEM精度均完全满足估算山地冰川长时间尺度物质平衡的精度要求。KH-9数据具有空间分辨率高，地面覆盖范围广，成像时间较早（1971-1980年）等特点，可为山地冰川物质平衡研究提供很好的基础数据源。

DEM extraction and precision evaluation of mountain glaciers in the Qianghai-Tibet Plateau based on KH-9 data: take the Purog Kangri Glacier and the Jiong Glacier as example

Early on the Qianghai-Tibet Plateau mountain glacier area, there was lack of DEM data. At that time, many problems had troubled, such as low precision and small coverage. Now, taking the Purog Kangri Glacier and the Jiong Glacier as cases, using the declassified early high-resolution spy satellites KH-9 stereo image pairs, the technical process of DEM extraction of mountain glaciers based on KH-9 data was established, and the accuracy evaluation and precision impact analysis of the extracted DEM were conducted based on ICESat GLAS elevation data. The evaluation results show that: the precision of DEM obtained from this research is quite satisfied for its precision in long-term mass balance of mountain glacier, whatever for the Purog Kangri or for the Jiong Glacier. The KH-9 data has the characteristics of high spatial resolution, wide surface coverage and able to get the early images (1971-1980), which can provide good basic data for studying mountain glacier mass balance.