(ATBD) SMAP Level 1 Radar Data Products - NASA

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14 Table 4: L1B Bit Flag Fields Field Name Shape Description antenna scan qual flag antenna scan array Flag relevant to spacecraft atttitude sigma0 mode flag σ 0 array Flags describing special features of each σ 0 measurement sigma0 qual flag hh σ 0 array Flags indicating quality issues with σ 0hh full footprint measurements sigma0 qual flag vv σ 0 array Flags indicating quality issues with σ 0vv full footprint measurements sigma0 qual flag hv σ 0 array Flags indicating quality issues with σ 0hv full footprint measurements sigma0 qual flag vh σ 0 array Flags indicating quality issues with σ 0vh full footprint measurements slice qual flag hh σ 0 slice array Flags indicating quality issues with σ 0hh range slice measurements slice qual flag vv σ 0 slice array Flags indicating quality issues with σ 0vv range slice measurements slice qual flag hv σ 0 slice array Flags indicating quality issues with σ 0hv range slice measurements slice qual flag vh σ 0 slice array Flags indicating quality issues with σ 0vh range slice measurements Table 5: L1C Bit Flag Fields Field Name Shape Description along track qual flag along track array Flag relevant to spacecraft atttitude cell mode flag swath array Flags describing special features of each σ 0 measurement cell sigma0 qual flag hh swath array Flags indicating quality issues with gridded 1 km σ 0hh measurements cell sigma0 qual flag vv swath array Flags indicating quality issues with gridded 1 km σ 0vv measurements cell sigma0 qual flag xy swath array Flags indicating quality issues with gridded 1 km σ 0xy measurements
15 Table 6: L1B antenna scan quality bit flags Bit Flag Pos. Description Value Interpretation 0 attitude mode 0 Spacecraft in normal Earth viewing mode 1 Spacecraft viewing cold space for radiometer calibration 1-15 Not used Always clear Table 7: L1B σ 0 mode bit flags Bit Flag Pos. Description Value Interpretation 0 Fore/Aft 0 σ 0 measurement center is forward of the spacecraft 1 σ 0 measurement center is aft of the spacecraft 1 water 0 Water fraction of grid cell below metadata threshold 1 Water fraction of grid cell exceeds metadata threshold 2-15 Not used Always clear
Page 1 and 2: Soil Moisture Active Passive (SMAP)
Page 3 and 4: Algorithm Theoretical Basis Documen
Page 5 and 6: i Contents 1 Introduction 1 2 Missi
Page 7 and 8: 1 1 Introduction This document desc
Page 9 and 10: 3 Table 1: SMAP Mission Requirement
Page 11 and 12: Table 2: SMAP Data Products Table 5
Page 13 and 14: 7 Table 3: Requirements applicable
Page 15 and 16: Figure 2: Flow of data in the SMAP
Page 17 and 18: 11 divided into two groups, a gener
Page 19: 13 positions in a half-orbit), and
Page 23 and 24: 17 Table 10: L1C cell mode bit flag
Page 25 and 26: 19 the spacecraft velocity vector w
Page 27 and 28: Figure 4: Overlapping conical scans
Page 29 and 30: 23 hang out by 500 m thus broadenin
Page 31 and 32: 25 τ pri = n 1 f stalo (8) τ p =
Page 33 and 34: 27 and R(t) indicates that the rang
Page 35 and 36: Figure 7: Schematic view of the nad
Page 37 and 38: 31 from about 400 m in the side loo
Page 39 and 40: 33 cross-section is estimated from
Page 41 and 42: 35 Figure 8: L1C Processing flow di
Page 43 and 44: 37 adpative floating point quantize
Page 45 and 46: 39 7.7 Azimuth Compression The coni
Page 47 and 48: 41 Figure 12: Processed image (azim
Page 49 and 50: 43 8 L1B Processing Algorithms Low
Page 51 and 52: 45 9.1 Antenna Gain Pattern Knowled
Page 53 and 54: Figure 15: Plot of the total number
Page 55 and 56: 49 For SAR processing, the real ape
Page 57 and 58: 51 as the loop back measurement per
Page 59 and 60: 53 have been removed, there can sti
Page 61 and 62: 55 11 RFI RFI signals are expected
Page 63 and 64: 57 11.2.1 Backlobe Contamination GN
Page 65 and 66: 59 12.1 Pre-Launch Before launch, v
Page 67 and 68: 61 12.2.2 Radiometric Accuracy Vali
Page 69 and 70: 63 References [1] National Research

(ATBD) SMAP Level 1 Radar Data Products - NASA

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