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MODIS PHENOLOGY: An Introduction to Land Cover Dynamics March 27, 2006 11:30 – 11:45

MODIS PHENOLOGY: An Introduction to Land Cover Dynamics March 27, 2006 11:30 – 11:45 EROS Forum Calli B. Jenkerson MODIS Science Data Specialist Land Processes Distributed Active Archive Center EROS Sioux Falls, SD USA. “For Use by Trained Personnel Only“. MOD12Q2

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MODIS PHENOLOGY: An Introduction to Land Cover Dynamics March 27, 2006 11:30 – 11:45

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  1. MODIS PHENOLOGY: An Introduction to Land Cover Dynamics March 27, 2006 11:30 – 11:45 EROS Forum Calli B. Jenkerson MODIS Science Data Specialist Land Processes Distributed Active Archive Center EROS Sioux Falls, SD USA

  2. “For Use by Trained Personnel Only“ MOD12Q2 MODIS/Terra Land Cover Dynamics Yearly L3 Global 1km SIN Grid V004 Boston University Department of Geography Mark Friedl John Hodges Xiaoyang Zhang Bin Tan

  3. “Never Before Seen in the U.S.“ MOD12Q2 Release Date: February 1, 2006 Acquisitions: January 1, 2001 – December 31, 2004

  4. “Wearing of this Garment does not Enable you to Fly.” • Phenology: • relations between climate and periodic biological phenomena or • response of living organisms to seasonal and climatic changes • due to variations in the duration of sunlight, precipitation, temperature, other life-controlling factors • Applicable to many “biological phenomena” • animal migration • insect lifecycles • hibernation cycles • vegetation growth

  5. “Remove Plastic Wrapper Before Eating.” MOD12Q2 - 8 Science Data Sets 1. Onset_Greenness_Increase 2. Onset_Greenness_Maximum 3. Onset_Greenness_Decrease 4. Onset_Greenness_Minimum 5. NBAR_EVI_Onset_Greenness_Minimum 6. NBAR_EVI_Onset_Greenness_Maximum 7. NBAR_EVI_Area 8. Dynamics_QC

  6. “This End Up” Image Dimensions  = 3 (2x1200x1200 num_modes/r/c) Area = 10° x 10° lat/long Size = 1200 x 1200 rows/columns Projection = Sinusoidal Average File Size = 41.3 MB Resolution = 1 kilometer Data Type = 16-bit Unsigned Integer

  7. “This product may have come in contact with peanuts.” • Greenness values derived from • Vegetation index data • Snow cover • Land surface temperature

  8. “Objects in Mirror are Closer than they Appear.” • Vegetation Index Data • MOD13 EVI algorithm executed on NBAR • MCD43B4 Nadir BRDF-Adjusted Reflectance • NBAR values are computed for the mean solar zenith angle of a 16-day period using daily multi- angle surface reflectances • (MOD13A2 derived from MOD09) • NBAR-derived VI range and summation included as supplementary product information

  9. “Items on top shelf may freeze and burst.” • Snow cover • presence of snow introduces a large source of temporal variation in EVI that is not associated with vegetation phenology • QA field in MODIS NBAR (MCD43B4) • snow-covered pixels removed from input

  10. “Caution: Liquid Contents may be Hot.” • Land surface temperature • screen for consecutive 16-day periods where the temperature is too low to support growth • MOD11A2 provides skin temperatures for 8-day periods by averaging daily LST values

  11. “Intended for Outdoor Use Only.” • Four phenological transition dates defining a growth cycle: • Onset greenness increase • vegetation begins active growth and photosynthesis • Onset greenness maximum • VI reaches its maximum • Onset greenness decrease • first disappearance of green leaves • Onset greenness minimum • VI returns to the level at which onset occurred

  12. “Do not Drive or Operate Heavy Machinery.” Greenness Dates A’ Onset increase B’ Onset maximum C’ Onset decrease D’ Onset minimum Defined using minimum and maximum values in the rate of change in curvature solid line = idealized time series of NBAR EVI dashed line = slope change rate derived from time series

  13. “Misuse May Cause Injury or Death.”

  14. “Rinse Thoroughly with Water if Product Comes into Contact with Eyes.” • MOD12Q2 Greenness Dates: • Expressed as • Number of Days Since January 1, 2000 • If vegetation in a pixel showed onset of greenness increase on March 20, 2002, the pixel’s value would be 810 1km pixel green-up occurred March 17, 2002 1km pixel green-up occurred March 20, 2002

  15. “Do Not Use while Sleeping or Unconscious.” MOD12Q2 - 8 Science Data Sets 1. Onset_Greenness_Increase 2. Onset_Greenness_Maximum 3. Onset_Greenness_Decrease 4. Onset_Greenness_Minimum 5. NBAR_EVI_Onset_Greenness_Minimum 6. NBAR_EVI_Onset_Greenness_Maximum 7. NBAR_EVI_Area 8. Dynamics_QC

  16. “Not a Protective Safety Device.” MOD12Q2 NBAR_EVI_Onset_Greenness_Minimum Subset of h25v07 in SE India (Andhra Pradesh, District of West Godavari)

  17. “May Contain Small Parts.” • No phenology estimates are calculated if: • no satellite observations for more than two consecutive 16-day periods the during vegetation growing season • "not processed, cloud" Dynamics_QC • EVI values are uniformly high within a given 12-month period • such as in some evergreen forests • EVI values all less than 0.05 in an annual period • such as in some deserts

  18. Bit 1-2 Bit 3-4 Quarters since last updated Mandatory good quality 1 TBD1 1 other quality 258 TBD2 258 not processed cloud 515 TBD3 515 not processed other 768 TBD4 768 Bit 5-8 Land water mask Shallow ocean 1 Land (Nothing else but land) 258 Ocean coastlines and lake 515 Shallow inland water 772 Ephemeral water 1029 Deep inland water 1286 Moderate or continental ocean 1543 Deep ocean 1792 Bit 9-16: Phenology Assessment 1-100, 255 FILL “Not Intended for Highway Use.” MOD12Q2 Dynamics QA

  19. “People with known heart conditions should consult a physician prior to engaging in this activity.” YEAR 1 YEAR 2 YEAR 3 193 001 193 001 193 PRODUCTION RUN 1: On Year 3 Day 001, acquisitions Year 1 Day 193 – Year 2 193 are processed PRODUCTION RUN 2: On Year 3 Day 193, acquisitions Year 2 Day 001 – Year 2 365 are processed

  20. “This spray may be harmful to small animals.” MOD12Q2.A2004001.h08v05 Onset_Greenness_Maximum colored by quarter

  21. “Contents Under Pressure.” CALLI JENKERSON LP DAAC 594 2638 JENKERSON@USGS.GOV

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