ASTER处理

ASTER影像偏移值和增益值、太阳辐照度波段辐射照度增益值偏移值Band118470.676-0.676Band215530.708-0.708Band311180.862-0.862Band4232.50.2174-0.2174Band580.320.0696-0.0696Band674.920.0625-0.0625Band769.20.0597-0.0597Band859.820.0417-0.0417Band957.320.0318-0.0318L=gain*DN+biasGain=增益值，bias偏移值=π*L*d2/(E*sin(θ))d=离地距离，E=太阳辐射照度，θ太阳高度角3.1415*(0.676*B1-0.676)*1.01^2/(1847*0.90630779)3.1415*(0.708*B2-0.708)*1.01^2/(1553*0.90630779)3.1415*(0.862*B3-0.862)*1.01^2/(1118*0.90630779)3.1415*(0.2174*B4-0.2174)*1.01^2/(232.5*0.90630779)3.1415*(0.0696*B5-0.0696)*1.01^2/(80.32*0.90630779)3.1415*(0.0625*B6-0.0625)*1.01^2/(74.92*0.90630779)3.1415*(0.0597*B7-0.0597)*1.01^2/(69.2*0.90630779)3.1415*(0.0417*B8-0.0417)*1.01^2/(59.82*0.90630779)3.1415*(0.0318*B9-0.0318)*1.01^2/(57.32*0.90630779)STER数据除去未经处理的原始数据Level0以外,其他的数据都经过了不同程度的处理。目前用户可以申请到的数据产品有L1、L2、L3三个级别。其中使用最多的是Level1产品。Level1类数据产品包括两种:Level1A(L1A)和Level1B(L1B)。L1A数据是经过重构的未经处理的仪器数据,保持了原有分辨率。L1A数据产品文件中包含了数据字典、类属头文件、云量覆盖表、辅助数据以及3个子系统的数据,子系统数据中包括各子系统的专门头文件、各个波段的影像数据、辐射计矫正表、几何矫正表和补充数据。L1B数据在L1A的基础上,使用L1A自带的参数完成辐射计反演和几何重采样后生成的。所以在子系统文件中少了辐射计矫正表和几何矫正表两项内容。在生产时用户可以根据需要选择采样方法,在默认情况下采用UTM投影,CubicConvolution重采样方法。ASTER每天能获得并处理650景左右L1A数据,L1B数据的最大产量为310景左右。更高级别的数据产品还有16种之多,是在L1数据产品的基础上进行处理后生成的,这些处理包括了更细致全面的辐射校正等。VNIR子系统有一个后视波段,极大地方便了在轨迹方向上进行立体观察。对Aster数据进行辐射定标时，具体是利用ENVI的FLASSH模块，在BasicTools——Preprocessing——CalibrationUtilities——FLASSH菜单下对里面的选项进行设置，包括选择传感器类型，你肯定选Aster，影像成像时间，地区平均高差，地区所处位置等等，其他选项基本上为默认选项。在做辐射定标之前必须保证，1、数据分辨率一致，因此需要对VINR数据进行重采样，2、数据格式是BIL或BIP的，而Aster默认格式是BSQ的，因此需要转换。不知是否满意WavelengthvaluesBand10.55600.band20.66100,band30.807.band41.656,band52.167,band62.209,band72.262,band82.336band92.4几何校正大气校正=59xyzq4tikiizDg6_JOnZtjKENgnhKQPYX7MTXp4VZExi6Rox69n4ILKY_AemiDNvqonWcwkYUD3g-jwzDc8fVTD552Yb9fhZtTfqgo3A5eAcquired:2013-05-30T05:25:52.998000ZSceneCenter:82.904/44.917BAND95/50/5%-TILESMIN/MAXMEAN/STDEVCOLOR1431/294/00/999266.6973/132.1352BLUE2379/245/00/943225.5546/115.0104GREEN3N422/269/00/837253.1634/128.5838RED(AllDNvaluesinunitsofUNKNOWN.)__?___?_?_VALUES_VNIR-BrowseImageLegend_Attr0.0__GROUP=INVENTORYMETADATAGROUPTYPE=MASTERGROUPOBJECT=BROWSEDESCRIPTIONNUM_VAL=1VALUE=ASTERSurfaceReflectance-VNIRBrowseImageAcquired:2013-05-30T05:25:52.998000ZSceneCenter:82.904/44.917END_OBJECT=BROWSEDESCRIPTIONOBJECT=PRODUCTIONDATETIMENUM_VAL=1VALUE=2013-12-26T07:48:20.000ZEND_OBJECT=PRODUCTIONDATETIMEGROUP=COLLECTIONDESCRIPTIONCLASSOBJECT=VERSIONIDNUM_VAL=1VALUE=1END_OBJECT=VERSIONIDOBJECT=SHORTNAMENUM_VAL=1VALUE=BrowseEND_OBJECT=SHORTNAMEEND_GROUP=COLLECTIONDESCRIPTIONCLASSEND_GROUP=INVENTORYMETADATAEND__?___?_?_VALUEScoremetadata.0_Attr0.0____??__?/PGSHOME/product.1312260021002/output/pg-BR2B05V0-1312260021_00_CDF0.0_ASTERSurfaceReflectance-VNIRBrowseImageAcquired:2013-05-30T05:25:52.998000ZSceneCenter:82.904/44.917BAND95/50/5%-TILESMIN/MAXMEAN/STDEVCOLOR1431/294/00/999266.6973/132.1352BLUE2379/245/00/943225.5546/115.0104GREEN3N422/269/00/837253.1634/128.5838RED(AllDNvaluesinunitsofUNKNOWN.)__?___?_?_VALUES_VNIR-BrowseImageLegend_Attr0.0__GROUP=INVENTORYMETADATAGROUPTYPE=MASTERGROUPOBJECT=BROWSEDESCRIPTIONNUM_VAL=1VALUE=ASTERSurfaceReflectance-VNIRBrowseImageAcquired:2013-05-30T05:25:52.998000ZSceneCenter:82.904/44.917END_OBJECT=BROWSEDESCRIPTIONOBJECT=PRODUCTIONDATETIMENUM_VAL=1VALUE=2013-12-26T07:48:20.000ZEND_OBJECT=PRODUCTIONDATETIMEGROUP=COLLECTIONDESCRIPTIONCLASSOBJECT=VERSIONIDNUM_VAL=1VALUE=1END_OBJECT=VERSIONIDOBJECT=SHORTNAMENUM_VAL=1VALUE=BrowseEND_OBJECT=SHORTNAMEEND_GROUP=COLLECTIONDESCRIPTIONCLASSEND_GROUP=INVENTORYMETADATAEND__?___?_?_VALUEScoremetadata.0_Attr0.0__GROUP=ASTERGENERICMETADATAGROUPTYPE=MASTERGROUPOBJECT=IDOFASTERGDSDATAGRANULENUM_VAL=1VALUE=AST2B5V1305300525521312260038BEND_OBJECT=IDOFASTERGDSDATAGRANULEOBJECT=RECEIVINGCENTERVALUE=EDOSNUM_VAL=1END_OBJECT=RECEIVINGCENTEROBJECT=PROCESSINGCENTERVALUE=ASTER-GDSNUM_VAL=1END_OBJECT=PROCESSINGCENTERGROUP=POINTINGANGLESOBJECT=POINTINGANGLESCONTAINERCLASS=1OBJECT=SENSORNAMECLASS=1NUM_VAL=1VALUE=VNIREND_OBJECT=SENSORNAMEOBJECT=POINTINGANGLECLASS=1NUM_VAL=1VALUE=-8.580000END_OBJECT=POINTINGANGLEOBJECT=SETTINGTIMEOFPOINTINGCLASS=1NUM_VAL=1VALUE=2013-05-30T05:25:34ZEND_OBJECT=SETTINGTIMEOFPOINTINGEND_OBJECT=POINTINGANGLESCONTAINEROBJECT=POINTINGANGLESCONTAINERCLASS=2OBJECT=SENSORNAMECLASS=2NUM_VAL=1VALUE=SWIREND_OBJECT=SENSORNAMEOBJECT=POINTINGANGLECLASS=2NUM_VAL=1VALUE=-8.536000END_OBJECT=POINTINGANGLEOBJECT=SETTINGTIMEOFPOINTINGCLASS=2NUM_VAL=1VALUE=2013-05-30T05:25:33ZEND_OBJECT=SETTINGTIMEOFPOINTINGEND_OBJECT=POINTINGANGLESCONTAINEROBJECT=POINTINGANGLESCONTAINERCLASS=3OBJECT=SENSORNAMECLASS=3NUM_VAL=1VALUE=TIREND_OBJECT=SENSORNAMEOBJECT=POINTINGANGLECLASS=3NUM_VAL=1VALUE=-8.558000END_OBJECT=POINTINGANGLEOBJECT=SETTINGTIMEOFPOINTINGCLASS=3NUM_VAL=1VALUE=2013-05-30T05:25:32ZEND_OBJECT=SETTINGTIMEOFPOINTINGEND_OBJECT=POINTINGANGLESCONTAINEREND_GROUP=POINTINGANGLESGROUP=GAININFORMATIONOBJECT=GAININFORMATIONCONTAINERCLASS=1OBJECT=GA