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How Well Do We Understand Earth Observation Electro-optical Sensor Parameters ?. George Joseph, ISRO, India President, ISPRS Commission-I (1996-2000) Stan Morain, EDAC, USA President ISPRS Commission-I (2000-2004). Carry Forward For Commission-I 2000-2004. - PowerPoint PPT Presentation
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How Well Do We UnderstandEarth Observation Electro-optical
Sensor Parameters ?George Joseph, ISRO, India
President, ISPRS Commission-I (1996-2000)
Stan Morain, EDAC, USAPresident ISPRS Commission-I (2000-
2004)
Spatial ResolutionInstantaneous Geometric Field-of-View (IGFOV)The geometric size of the image projected by the detector on the ground through the optical system—”pixel footprint”
Radiometrically Accurate IFOV (RAIFOV) The resolution for which the MTF is higher than 0.95
Effective Instantaneous Field-of View (EIFOV) The resolution corresponding to a spatial frequency (ground resolution) for which the system MTF is 50%
Modulation Transfer Function (MTF) The reduction in contrast in the image compared to the contrast of the objects imaged
Radiometric ResolutionParameters Sensor #
1Sensor #
2
Sat Radiance (mw/cm2/strd/μm)
20 35
Quantization 7 8Radiometric Sampling Interval
0.16 0.14
System S/N at SR 120 150NEΔρ .17 .23
Radiometric ResolutionTM Band
Moment FWHM
λc Δλ λc Δλ
1 486 71.5 485 66.1
2 571 88.7 569 80.6
3 660 77.1 659 68.7
4 839 134.9 841 129.1
5 1678 227 1676
216.9
7 2217 269 2272
250.2
Parameter SummaryIGFOV Along, Across
Trck% out-of-band Res Metric?
RAIFOV Along, Across Trck
Saturation Radiance
mw/cm2/strad/μm
GSD Along, Across Trck
Quantization bits
Swath (TFOV)
mrad S/N Ru; Rt
SWR @ IGFOV
Along, Across Trck
Radiometric Accurcy
Absolute; Relative
SWR @ GSD Along, Across Trck
Data Compression RMS error
Band-band Reg
Metric? Polarization accuracy
Metric?
Central λ λc Revisit Period 0° Lat; 40° Lat
Bandwidth Δλ Repeat Period ° off-nadir
Carry Forward For Commission-I
2000-2004• Identify a set of sensor parameters to ensure maximum retrieval of information
• Make intrinsic sensor capabilities transparent so users can make sound choices
• Formulate standard procedures for measuring parameters