1 / 54

11:00-11:45 AM Tuesday, 28 November 2006 Landsat Calibration Working Group (LCWG) Meeting

Landsat-7 ETM+ Radiometry Instrument-Based Stability/Calibration for Level-OR Characterization & Correction. The Art and Precision of ETM+ Radiometry 3. Landsat Project Science Office (LPSO) IAS-Based Internal Calibrator (IC) Lamp Characterization.

ciara
Download Presentation

11:00-11:45 AM Tuesday, 28 November 2006 Landsat Calibration Working Group (LCWG) Meeting

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Landsat-7 ETM+ Radiometry Instrument-Based Stability/Calibrationfor Level-OR Characterization & Correction The Art and Precision of ETM+ Radiometry 3. Landsat Project Science Office (LPSO) IAS-Based Internal Calibrator (IC) Lamp Characterization 11:00-11:45 AM Tuesday, 28 November 2006 Landsat Calibration Working Group (LCWG) Meeting At NASA Goddard Space Flight Center (GSFC, Bldg 33, Rm A128) Greenbelt, MD 20771 USA by John L. Barker, Ph. D. Landsat Associate Project Scientist, John.L.Barker@nasa.gov, 301-614-6610 LPSO:Land Cover Satellite Project Science Office, NASA/GSFC/614.4 Greenbelt, MD 20771 USA and Jennifer Sun SSAI, Jennifer.B.Sun@gsfc.nasa.gov, 301-614-6618 LPSO:Land Cover Satellite Project Science Office, NASA/GSFC/614.4 Greenbelt, MD 20771 USA John Barker: 1) 2)

  2. Agenda of Workshop on The Art and Precision ofLandsat-7 ETM+ Radiometry • 9:00 1. Approach to On-Board Characterization of ETM+ • 10:00 2. Landsat-7 ETM+ MOC and PCD Telemetry • 11:00 3. IAS-Based IC Lamp Characterization • 12:00 Lunch • 13:30 4. Path-Processing (PP) of ETM+ Background • 14:30 5. PP-Based IC Lamp Characterization John Barker: 1) IC trend is relatively linear/stable after 2.6 y, after 4.2y 2) Principle components, graying of all bands, internal IC optics ( Dichroics or ND filters) needs to be done to agree to Lamp-2 3_need sensitivity curves on orbit

  3. Thanks for Multi-Year SupportTalk 3. IC Lamp-Based Modeling of IAS-Data USGS EDC Image Assessment System (IAS) Creating , filling and maintaining the Landsat-7 IAS Oricle Database Mission Operation Center (MOC) Delta-I imaging collects & on-line telemetry access LPSO Contract personnel Jennifer Sun, Jeff Miller and Dave Landis NASA support for LPSO Analysis, modeling & algorithm development Landsat Project Scientist Recognizing need for team & continuity John Barker: 1) IC trend is relatively linear/stable after 2.6 y, after 4.2y 2) Principle components, graying of all bands, internal IC optics ( Dichroics or ND filters) needs to be done to agree to Lamp-2 3_need sensitivity curves on orbit

  4. Outline of Talk 3. IAS Database IC ModelingThe Art & Precision of ETM+ Radiometry Pictures of ETM+ Why instrument-based lamp-based monitoring? Why scene-base Image-Assessment-System (IAS) database? LPSO Filtering of IAS Data (Lamp-1 &-2) IAS-database scene availability as of 13OCT2006 Lamp-2 IC Rate of Change Lamp-1 IC Characterization Lamp-1 IC Normalization John Barker: 1) IC trend is relatively linear/stable after 2.6 y, after 4.2y 2) Principle components, graying of all bands, internal IC optics ( Dichroics or ND filters) needs to be done to agree to Lamp-2 3_need sensitivity curves on orbit

  5. Why Lamp-Based Characterization?Strengths Talk 3. IC Lamp-Based Modeling of IAS-Data Higher short-term 15-day reproducibility of ± 0.1 % on trends than ground observations or cross-calibration Scan-based pulses (0.072 seconds/scan) allow checking for forward and reverse scan differences Ability to monitor within- and between orbits potentially correctable for slow-varying systematic trends Ability to characterize individual detectors not just band-average John Barker: 1) IC trend is relatively linear/stable after 2.6 y, after 4.2y 2) Principle components, graying of all bands, internal IC optics ( Dichroics or ND filters) needs to be done to agree to Lamp-2 3_need sensitivity curves on orbit

  6. Why Lamp-Based Characterization? Limitations & Ameliorations Talk 3. IC Lamp-Based Modeling of IAS-Data Lamps need to equilibrate (use only equilibrated data) Lamp filaments degrade (source of most of IC change) limit degradation by limiting use (Lamp-2) normalize for: 1) lamp current, 2) temperature (IC vs Detectors), 3) point discontinuities, 4) lamp flares (between-band constancy) and 5) vacuum and/or zero-g on-orbit changes cross-calibrate normalized lamps Does not monitor fore-optics of ETM+ compare trends in sensitivity to solar panel John Barker: 1) IC trend is relatively linear/stable after 2.6 y, after 4.2y 2) Principle components, graying of all bands, internal IC optics ( Dichroics or ND filters) needs to be done to agree to Lamp-2 3_need sensitivity curves on orbit

  7. Why Scene-Based Monitoring? Talk 3. IC Lamp-Based Modeling of IAS-Data Landsat archive has been historically organized by scene radiometrical path-processing is better John Barker: 1) IC trend is relatively linear/stable after 2.6 y, after 4.2y 2) Principle components, graying of all bands, internal IC optics ( Dichroics or ND filters) needs to be done to agree to Lamp-2 3_need sensitivity curves on orbit

  8. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data Lamp-1 IC Trends (TSL7) of “Random” Collects from IAS Database John Barker: 1) 2)

  9. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data Net IC Pulse (∆P) Background (B) Std. Dev. (SD_B) High and Low Gain John Barker: 1) 2)

  10. B2D12 Lamp-1 IAS Input of ∆P, B & SD_B in H & L Gain Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data

  11. B8D27 Lamp-1 IAS Input of ∆P, B & SD_B in Low Gain Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data

  12. 8-Step Filtering of IAS ScenesFilter-2 (25NOV2006)Talk 3. IC Lamp-Based Modeling of IAS-Data 1. Input of Raw Data from IAS-Database as of 13OCT06 “Clean” collects after fixing background filter No LPGS data 2. Remove Side-B scenes 3. Filter out dates of cooldown after Delta-I maneuvers 4. Filter for TCFP = 91.4 K ± 2 SD 5. Hawkins outliers filter on SD_B 6. Common PCD telemetry temperatures 7. IC equilibration by t_on > 10 minutes 8. Common bands (except B7) John Barker: 1) Tim and Emily and Dennis, 9:35 2)

  13. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PH_L1_B1D15 after SD_B outliers removed (Step-5)

  14. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PH_L1_B1D15 filtered for common-T (Step 6)

  15. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PH_L1_B1D15 filtered for t_on > 10’ (Step 7)

  16. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PL_L1_B7D9 filtered for t_on > 10’ (Step 7)

  17. 13OCT2006 Scenes Count in IAS Database Lamp-1 Scenes Removed by 7-Step Filter-2 Talk 2. MOC & PCD Telemetry

  18. 13OCT2006 Scenes Count in IAS Database Lamp-2 Scenes Removed by 7-Step Filter-2 Talk 2. MOC & PCD Telemetry

  19. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data Lamp-2 IC “Raw” “Random” Input from EDC IAS Database John Barker: 1) 2)

  20. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data B2D12 Lamp-2 IAS Input of ∆P, B & SD_B in H & L Gain

  21. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data Lamp-2 IC filtered for t_on > 10’ with linear fit for TSL7 > 5.5 years John Barker: 1) 2)

  22. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PH_L2_B1D15 >5.5y -0.29%/y (-7.1% from OIVP to 8y)

  23. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PL_L2_B1D15 >5.5y -0.20%/y (no OIVP in low gain)

  24. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PH_L2_B2D12 >5.5y -0.20%/y (-4.0% from OIVP to 8y)

  25. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PL_L2_B1D15 >5.5y -0.07%/y (-3.2% from OIVP to 8y)

  26. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PH_L2_B3D8 >5.5y -0.20%/y (-4.0% from OIVP to 8y)

  27. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PL_L2_B3D8 >5.5y -0.04%/y (-3.5% from OIVP to 8y)

  28. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PH_L2_B4D7 >5.5y +0.02%/y (+0.3% from OIVP to 8y)

  29. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PH_L2_B5D14 >5.5y -0.05%/y (-1.1% from OIVP to 8y)

  30. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PL_L2_B7D9 >5.5y -0.00%/y ( No OIVP B7 low gain)

  31. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data ∆PL_L2_B7D27 >5.5y +0.02%/y (-1.4% from OIVP to 8y) John Barker: 1) 2)

  32. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data Normalized Net Pulse N∆P= 100(∆P-S ∆P)/S ∆P John Barker: 1) 2)

  33. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data Lamp-1 IC N∆P Temperature- Dependence on TPFP John Barker: 1) 2)

  34. Lamp-1 Linear B2D12 Temperature Sensitivity (%/°C) of ∆ N∆PH vs ∆ TPFP for t_on>10’ (Equilibrated) John Barker: 7JUN2006 1) Add quantization width for temperature, 13c ref mpt 12C (use one temperature for the whole mission) 2) Add DN scale for both axes or scales alternate Y-axis, quantization of vertical lines is temperature quantization 3) Known SD of N delta P, average of 2 PCD data points. Every 16 second PCD. 1 DN = 0.117 C

  35. Lamp-1 ETM+ Temperature Dependencefor IAS t_on > 10’ (equilibrated) John Barker: 1)Summary with no interpretation 2) No obvious correlation, control IC should have not effect. No detector effect in B5/B7 (constant 91.4K). Electronics of pre-amp on B5/B7 still stable. Therefore we should see no detector dependence temperature effect so the observed effect of 0.02 to 0.04 is either IC effect or effect on relay optics. Check relay optics tempeartures probalby correlated to TPFP. 3) Find another way to summary plot

  36. Unequilibrated Current Sensitivityfor 1’ < t_on < 4’Talk 3. IC Lamp-Based Modeling of IAS-Data Current Sensitivity Normalizd Pulse (N∆P) Lamp-1 vs Resampled Current John Barker: 1) 2) See PowerPoint File: 20060601 I Ieq step2_3.ppt Step 2: Current Equilibration of Pulse

  37. John Barker: 5JUL2006 1) 1 < t_on < 4 minutes used, since for t_o > 4 minutes (1/2**4 = .0625) is only 6- % away from equilibration 2) Remove temperature on x-axis 3) Cycling is probably processing of 0.02TA0.01; try wider TA: 0.04TA0.01 and 0.05TA0.01 to reduce aliasing for ∆Q Plot raw N∆P vs ∆I = I -I_15TA1 (t_on > 10 minutes) , put unaccounted for variance on separate line. Plot resampled N∆P_.04TA.01 vs ∆I_.04TA.01, N∆P_.06TA.01 vs ∆I_.06TA.01, and wider until cycles go away Lamp-1 Linear B1D15 Current Sensitivity (%/mAmp) of ∆ N∆PH vs ∆ I for 1’ < t_on <10’ (Traveling Average of current sampled every 0.01 mAmp)

  38. L1 Current-Sensitivity Wavelength-Dependencefor 1’ < t_on < 4’(Unequilibrated)Talk 3. IC Lamp-Based Modeling of IAS-Data John Barker: 1) Jen does fit in IDL; relative smooth curve 2) B8 is not average of B1-4. IAS-based Derivation of current sensitivity looks like smooth Blackbody, effective T of lamp If current only was equilibrating, then all sensitivities should be positive, therefore it is assumed that something else like IC Optics is also equilibrating

  39. Current-Sensitivity of ∆Pfitted to Lamp-2 Current & TPFP for Bands 1-5 & 7 vs Wavelengthfor Path-Processing on 3 Dates  Rb1 Path-Based L2 Current Sensitivity, Rb1=b1/b0 (% per mAmp) Wavelength,  (nanometers) John Barker: Fr 9JUN2006 1) The table incorrectly contains Rb2 values of temperature sensitivity, not current sensitivity. 2) Need to do a regression fit for blackbody radiation vs wavelength 3) Correct spelling of processing in title 4) L1 and L2 don’t compare well, L2 range: 1< Rb1_L2 < 10, -2 Rb1_L1 < 3

  40. Current-Sensitivity of ∆Pfitted to Lamp-1 Current & TPFP for Bands 1-5 & 7 vs Wavelengthfor Path-Processsing on a single Date  Rb1 Path-Based L1 Current Sensitivity, Rb1=b1/b0 (% per mAmp) Wavelength,  (nanometers) John Barker: 1) 2)

  41. Wavelength-Dependence of IAS-Derived Lamp-1 Current-Sensitivity for ETM+ Net IC Pulses John Barker: 1) 2)

  42. Lamp-1 IAS Current Sensitivities t_on > 10’ (equilibrated), TSL7 > 5.5 y Assume all change is due to change in current All sensitivities are positive as expected John Barker: 1) Still a wavelength dependence after current correction may still be uncorrected lamp filament temperature effects, but nothing to do with any band-specific change in detector sensitivity for re-calibrate 2)

  43. Proposed Lamp-1 IAS IC Research Talk 3. IC Lamp-Based Modeling of IAS-Data Review lamp-1 IC IAS scene-based results Temperature sensitivity from equilibrated scenes Current sensitivity from unequilibrated scenes Equilibrated current sensitivity Proposed lamp-1 IC IAS scene-based normalizations Temperature normalization to TREF (AVE SLC-Off) Current normalization of equilibrated scenes Current normalization of unequilbrated scenes to test for t_on dependence of IC Optics John Barker: 1) Tim and Emily and Dennis, 9:35 2)

  44. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data Ave Paired Gross Pulse Gain Conversion B1D15 QH = 0.0505 + 1.5004 QL

  45. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data Pair-by-pair trend of gain conversion coefficients Plot of A0 offset in DN for B1D15 Using Smoothed High & Low Gain Gross IC P Suggests unlikely change in A0 from 0 with time

  46. Landsat-7 ETM+ Radiometry Talk 3. IC Lamp-Based Modeling of IAS-Data Pair-by-pair trend of gain conversion coefficients Plot of A1 slope for Smoothed B1D15 Using High & Low Gain Gross IC P Suggests unlikely change in A1 From 1.50 to 1.70

  47. Observed IAS-IC Precision and TrendingTalk 3. IC Lamp-Based Modeling of IAS-Data Temperature-Correction (within-band) up to 0.3 % Current-Equilibration (within-band) up to 2 % Current-Normalization (within-band) -1 to +7 % IC Between-Bands Normalization up to 6 % John Barker: 1) IC trend is relatively linear/stable after 2.6 y, after 4.2y 2) Principle components, graying of all bands, internal IC optics ( Dichroics or ND filters) needs to be done to agree to Lamp-2 3_need sensitivity curves on orbit

  48. Conclusions (1 of 2)Talk 3. IC Lamp-Based Modeling of IAS-Data Lamps equilibrate to 0.1 % within ten minutes Lamp-2 current is constant over mission lifetime Lamp-2 trends less than any other calibrator Lamp-1 shows linear current sensitivity, Observed change in lamp current correctable Lamp-1 shows linear temperature sensitivity John Barker: 1) IC trend is relatively linear/stable after 2.6 y, after 4.2y 2) Principle components, graying of all bands, internal IC optics ( Dichroics or ND filters) needs to be done to agree to Lamp-2 3_need sensitivity curves on orbit

  49. Conclusions (2 of 2)Talk 3. IC Lamp-Based Modeling of IAS-Data Forward scan pulses are moving into image Forward and reverse scan pulses are nearly the same Low to high gain conversions have an offset also not exactly 1.5000x slope (gain) factor Unconfirmed apparent change in conversion offset and gain factor with TSL7 IC and FASC both show B7 on-orbit equilibration B4 and B8 on-orbit equilibration only in IC John Barker: 1) IC trend is relatively linear/stable after 2.6 y, after 4.2y 2) Principle components, graying of all bands, internal IC optics ( Dichroics or ND filters) needs to be done to agree to Lamp-2 3_need sensitivity curves on orbit

  50. Operational IAS IC RecommendationsTalk 3. IC Lamp-Based Modeling of IAS-Data For variables used in a quantitative manner for populating the IAS radiometric database Use MOC instead of PCD telemetry Use smoothing and fitting equations Populate IAS Database with Separate forward and reverse scan IC pulses Populate IAS Database with daily scene-based collects 50 % random 50 % (at on-time = 10 minutes, and max on-time) John Barker: 1) IC trend is relatively linear/stable after 2.6 y, after 4.2y 2) Principle components, graying of all bands, internal IC optics ( Dichroics or ND filters) needs to be done to agree to Lamp-2 3_need sensitivity curves on orbit

More Related