HJ-1卫星延寿期的CCD影像质量评价与可用性分析

Quality evaluation and usability analysis of CCD image in life extension period for HJ-1 satellite

HJ-1卫星发射升空投入运行以来,已在灾害与环境的快速监测与预报领域发挥了重要作用。HJ-1卫星目前已经成功运行3a多,属于超期服役状态。为了评价延寿期影像质量,该文从影像的几何校正精度、灰度特征和纹理特征3个方面对延寿期HJ-1A-CCD影像进行分析,并与正常寿命运行期的HJ-1ACCD影像、同时期的Landsat7 ETM+影像进行比较,分析结果表明:延寿期HJ-1A-CCD影像质量虽然有一定程度的下降,但其与正常寿命期影像质量接近,仍能较好地描述丰富的地物类型及地物细节信息,可以像正常寿命期影像一样,有效地用于环境监测、灾害监测、国土资源管理、城市规划、农业应用等方面。

HJ-1 Satellite has made an important role in monitoring and prediction of disaster and environment since it launched successfully, and it has been serviced for 3 years, and it is in extension period. In order to evaluate image in the extension period, the study selected three image features： geometric deviation, texture feature and gray level feature. By comparing the images of the same temporal Landsat7 ETM＋ and the forepart HJ-1A CCD, the quality of the extension period images from CCD sensor onboard HJ-1 Satellite was evaluated objectively. The result shows that the quality of extension period image of HJ-1 Satellite has declined a little, but it is close to the forepart image of HJ-1 Satellite. Image of HJ-1 Satellite in the extension period still can describe the types of the surface features and details. It still can provide service like the forepart image in environment monitoring, disaster monitoring, land and natural resources management, city planning and agricultural application.