Module 5: MODIS NonVeg Land Products

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Module 5 MODIS Non-Veg Land Products Radiation
Budget Variables Surface Reflectance Land
Surface Temperature (LST) and Emissivity Snow
and Ice Cover Bi-directional Reflection (BRDF)
and Albedo Thermal Anomolies (Fire)
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Available Resolutions
Product Spatial Resolution Temporal
Resolution Reflectances 250m, 500m,
1km daily (L2), 8-day (L3) Snow
Cover 500m daily, 8-day, monthly Fire and
Thermal 1km daily, 8-day Land Surface Temp
1km daily, 8-day Albedo 1km daily,
8-day
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Land Surface Reflectances

• Mostly serve as inputs to higher level
  biophysical products.
• - vegetation indices, snow/ice, FPAR/LAI
• Atmospheric Correction Applied
• - atmospheric gases, aerosols, and cirrus clouds
• - applied to all cloud free pixels
• Corrected view and illumination angle effects
• Pixel Overlap (Level 3) - Best pixel in
  overlap areas is kept
• Gridded/Projected (Level 3)

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Global Composite Map of Nadir BRDF-Adjusted
Reflectance (NBAR) April 722 2001
True color, MODIS Bands 2, 4, 3
10 km resolution, Hammer-Aitoff
projection, produced by MODIS BRDF/Albedo Team
MODLAND/Strahler et al.
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Land Surface Reflectances
Chesapeake Bay, USA - March 26, 2000
645 nm (red), 555 nm (green), 469 nm (blue)
250 m red band
1km AVHRR
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Snow and Ice Cover
MODIS 8-day composite March 15-22, 2000
white snow green land gray clouds red line
average March snow line yellow line
average February snow line
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Snow and Ice Cover

• Product Resolution
• Global, 500m cell size
• Daily
• 8 day composite - any day with snow tags
  a pixel as having snow
• - statistics include persistence and
  duration of snow cover

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Normalized Difference Snow Index

• Pixel gt 50 snow cover mapped if
• NDSI gt 0.4 and band 2 reflectance gt 11
• Additional criteria for dense forests using
  NDVI
• MODIS Cloud Mask used

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Fire and Thermal Anomolies
Absolute Fire Detection 1. T4 gt 360K OR
2. T4 gt 320K and T4-T11 gt 20K
Relative To Background Pixels 1. T4 gt
mean(T4) 4 StdDev(T4) AND 2. T4-T11 gt
median(T4-T11) 4 StdDev(T4-T11)
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