ASTER User Handbook

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ASTER Users Handbook ASTER Level-1B Data Granule Data Directory Generic Header Cloud Coverage Table Ancillary Data VNIR Data VNIR-Specific Header VNIR Band 1 VNIR Band 2 VNIR Band 3N VNIR Band 3B VNIR Image Data VNIR Supplementary Data VNIR-Specific Header SWIR Data SWIR Band 4 SWIR Band 5 SWIR Band 6 SWIR Band 7 SWIR Band 8 SWIR Band 9 SWIR Image Data SWIR Supplementary Data TIR-Specific Header TIR Data TIR Band 10 TIR Band 11 TIR Band 12 TIR Band 13 TIR Band 14 TIR Image Data Geolocation Field Data TIR Supplementary Data Figure 8: Data Structure of an ASTER Level-1B Data Granule. 20
ASTER Users Handbook The L1B data product is generated, by default, in UTM projection in swath orientation, and Cubic Convolution resampling. An L1B in a different projection and/or resampling method can be produced on request from GDS in Japan (Table 2). Table 2: Resampling Methods and Projections Available for Producing Level-1B products. Resampling methods Nearest Neighbor (NN) Cubic Convolution (CC) Bi-Linear (BL) Map Projections Geographic (EQRECT) Lambert Conformal Conic (LAMCC) Space Oblique Mercator (SOM) Polar Stereographic (PS) Universal Transverse Mercator (UTM) Each image contains geolocation information stored as a series of arrays. There is one set of geolocation information (array) per nadir telescope (3 sets total). Each geolocation array is 11 x 11 elements size, with the top left element (0,0) in the image for the nadir views. For the backward view the image is offset with respect to the geolocation array. The nadir VNIR and backward-viewing VNIR images use the same latitude/longitude array, except the backwardviewing image is offset with respect to the nadir image. The L1B latitude and longitude geolocation arrays are two 11 x 11 matrices of geocentric latitude and geodetic longitude in units of degrees. The block size of the geolocation array is 420 lines by 498 samples for the VNIR bands; 210 lines by 249 samples for the SWIR bands; and 70 lines by 83 samples for the TIR bands. Appendix I provides a dump of the metadata contained in a L1B data product. There are five metadata groups: Productmetadata.0 Productmetadata.1 Productmetadata.V Productmetadata.S Productmetadata.T ……………. 21
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