海岸带区域SPOT卫星数据大气校正处理

将SPOT卫星自身近红外波段的数据作为气溶胶信息的来源,假设近红外波段暗像元受到大气影响较弱,卫星表观反射率近似等于地表反射率,且近红外波段暗像元与红光波段具备近似的线性关系,通过开源6S大气辐射传输模型的调试运行,并结合敏感性实验建立大气校正所需的查找表,最后通过一定的算法,实现了SPOT卫星Level_0级数据的大...

Atmospheric correction of the SPOT satellite data of the coastal zones

Remote sensing is an effective auxiliary way for coastal zone management with the advantages of wide observation range,real time,quasi synchronous,short cycle and low cost.It can be used for coastline variance detection,tidal zone thematic mapping and islands mapping.In order to make better use of remote sensing image,some preprocessing work must be done first properly.In this paper,near infrared band（1.58¹.75 μm） data from SPOT satellite are used as the source of aerosol information and two important supposes are applied:（1） the influence of atmosphere on the dark pixel of the near infrared band is feeblish,thus the apparent reflectivity of the satellite can be treated as the ground surface reflectivity;（2） the near infrared band and the red band have a near-linear relationship.By running a 6SV-Model combined with sensitivity test for creating a Look-Up-Table（LUT）,the atmospheric correction of Level₀ data of SPOT satellite can be done,and processing program based on matlab that can effectively handle L0 data of the satellite has been developed.After atmospheric correction on the coastal zone image with this method,the clarity of the image is greatly improved.Compared with the quasi-synchronous MODIS₀9 data,the relative error of the resulted real ground surface reflectivity is 15%.