ASTER处理.docx
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- 上传时间:2023-05-10
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ASTER处理.docx
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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
Band1
1847
0.676
-0.676
Band2
1553
0.708
-0.708
Band3
1118
0.862
-0.862
Band4
232.5
0.2174
-0.2174
Band5
80.32
0.0696
-0.0696
Band6
74.92
0.0625
-0.0625
Band7
69.2
0.0597
-0.0597
Band8
59.82
0.0417
-0.0417
Band9
57.32
0.0318
-0.0318
L=gain*DN+bias
Gain=增益值,bias偏移值
P=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
Acquired:
2013-05-30T05:
25:
52.998000Z
SceneCenter:
82.904/44.917
BAND95/50/5%-TILESMIN/MAXMEAN/STDEVCOLOR
1431/294/00/999266.6973/132.1352BLUE
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3N422/269/00/837253.1634/128.5838RED
(AllDNvaluesinunitsofUNKNOWN.)
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2013-05-30T05:
25:
52.998000Z
SceneCenter:
82.904/44.917"
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ASTERSurfaceReflectance-VNIRBrowseImage
Acquired:
2013-05-30T05:
25:
52.998000Z
SceneCenter:
82.904/44.917
BAND95/50/5%-TILESMIN/MAXMEAN/STDEVCOLOR
1431/294/00/999266.6973/132.1352BLUE
2379/245/00/943225.5546/115.0104GREEN
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(AllDNvaluesinunitsofUNKNOWN.)
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2013-05-30T05:
25:
52.998000Z
SceneCenter:
82.904/44.917"
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__?
___?
_?
_VALUES
coremetadata.0_Attr0.0__
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- 关 键 词:
- ASTER 处理