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MODIS

MODIS Vegetation Indices (MOD13) Collection 6

Product Identifer: MOD13_V6_DetailedQA

Details

The MODIS Vegatation indice (VI) QA band. This specification is valid for most of the MOD13 products, with the exception of MOD13C1 and MOD13C2.

MOD13 Collection 6.1 is identical to Collection 6.0.

While the flag specifications are the same for the following 4 products, the details are slightly different for each within the VI_Usefulness flag. See the product guide for details.

  • MOD13Q1 - 16-day 250m VI
  • MOD13A1 - 16-day 500m VI
  • MOD13A2 - 16-day 1km VI
  • MOD13A3 - Monthly 1km VI

Flag Descriptions

Bits Flag Name Descriptions
0-1 VI_Quality 0 - VI produced with good quality
1 - VI produced, but check other QA
2 - Pixel produced, but most probably cloudy
3 - Pixel not produced due to other reasons than clouds
2-5 VI_Usefulness 0 - Highest quality
1 - Lower quality
2 - Decreasing quality
3 - Decreasing quality
4 - Decreasing quality
5 - Decreasing quality
6 - Decreasing quality
7 - Lowest quality
8 - Quality so low that it is not useful
9 - L1B data faulty
10 - Not useful for any other reason/not processed
6-7 Aerosol_Quantity 0 - Climatology
1 - Low
2 - Intermediate
3 - High
8 Adjacent_cloud_detected 0 - No
1 - Yes
9 Atmosphere_BRDF_Correction 0 - No
1 - Yes
10 Mixed_Clouds 0 - No
1 - Yes
11-13 Land_Water_Mask 0 - Shallow ocean
1 - Land (Nothing else but land)
2 - Ocean coastlines and lake shorelines
3 - Shallow inland water
4 - Ephemeral water
5 - Deep inland water
6 - Moderate or continental ocean
7 - Deep ocean
14 Possible_snow_ice 0 - No
1 - Yes
15 Possible_shadow 0 - No
1 - Yes

References docs

MODIS Vegetation Index User’s Guide (MOD13 Series) Version 3.00, June 2015 (Collection 6)
MODIS Vegetation Index User’s Guide (MOD13 Series) Version 3.10, Sept 2019 (Collection 6.1)

Confirmed products

MODIS Vegetation Indices CMG (MOD13) Collection 6

Product Identifer: MOD13C_V6_DetailedQA

Details

The MODIS Vegatation indice (VI) QA band for the CMG (climate modeling grid) products.

This specification is identical to the other MOD13 products except that a Geospatial_quality flag is added, and the Possible_snow_ice and Possible_shadow flags removed.

MOD13 Collection 6.1 is identical to Collection 6.0.

  • MOD13C1 - 16-day 0.05-deg VI
  • MOD13C2 - monthly 0.05-deg VI

Flag Descriptions

Bits Flag Name Descriptions
0-1 VI_Quality 0 - VI produced with good quality
1 - VI produced, but check other QA
2 - Pixel produced, but most probably cloudy
3 - Pixel not produced due to other reasons than clouds
2-5 VI_Usefulness 0 - Highest quality
1 - Lower quality
2 - Decreasing quality
3 - Decreasing quality
4 - Decreasing quality
5 - Decreasing quality
6 - Decreasing quality
7 - Lowest quality
8 - Quality so low that it is not useful
9 - L1B data faulty
10 - Not useful for any other reason/not processed
6-7 Aerosol_Quantity 0 - Climatology
1 - Low
2 - Intermediate
3 - High
8 Adjacent_cloud_detected 0 - No
1 - Yes
9 Atmosphere_BRDF_Correction 0 - No
1 - Yes
10 Mixed_Clouds 0 - No
1 - Yes
11-13 Land_Water_Mask 0 - Shallow ocean
1 - Land (Nothing else but land)
2 - Ocean coastlines and lake shorelines
3 - Shallow inland water
4 - Ephemeral water
5 - Deep inland water
6 - Moderate or continental ocean
7 - Deep ocean
14-15 Geospatial_quality 0 - ≤ 25% of the finer 1-km resolution contributed to this CMG pixel
1 - > 25% and ≤ 50% of the finer 1-km resolution contributed to this CMG pixel
2 - > 50% and ≤ 75% of the finer 1-km resolution contributed to this CMG pixel
3 - > 75% of the finer 1-km resolution contributed to this CMG pixel

References docs

MODIS Vegetation Index User’s Guide (MOD13 Series) Version 3.00, June 2015 (Collection 6)
MODIS Vegetation Index User’s Guide (MOD13 Series) Version 3.10, Sept 2019 (Collection 6.1)

Confirmed products

MODIS Collection 6 LAI/FPAR Products FparLAI_QC

Product Identifer: MODIS_LAIV6_FparLAI_QC

Details

The MODIS Leaf Area Index (LAI) and Fraction of Photosynthetically Active Radiation (FPAR).

This and MODIS_LAIV6_FparExtra_QC both compliment each other.

There are several MODIS LAI/FPAR products which all use the same algorithms and resulting QA info.

  • MOD15A2H - Terra/500m/8day
  • MYD15A2H - Aqua/500m/8day
  • MCD15A2H - Terra+Aqua/500m/8day
  • MCD15A3H - Terra+Aqua/500m/4day

Two recent versions, v006 and v0061, also have identical QA info for all 4 products.

Flag Descriptions

Bits Flag Name Descriptions
0 MODLAND_QC 0 - Good quality (main algorithm with or without saturation)
1 - Other quality (back−up algorithm fill values)
1 Sensor 0 - Terra
1 - Aqua
2 Dead_Detector 0 - Detectors apparently fine for up to 50% of channels 1, 2
1 - Dead detectors caused >50% adjacent detector retrieval
3-4 Cloud_State 0 - Significant clouds NOT present (clear)
1 - Significant clouds WERE present
2 - Mixed cloud present in pixel
3 - Cloud state not defined, assumed clear
5-7 SCF_QC Five−level confidence score
0 - Main (RT) method used with no saturation, best result possible
1 - Main (RT) method used with saturation, good and very usable
2 - Main (RT) method failed due to bad geometry, empirical algorithm used
3 - Main (RT) method failed due to problems other than geometry, empirical algorithm used
4 - Pixel not produced at all, value couldn't be retrieved (possible reasons: bad L1B data, unusable MOD09GA data)

References docs

MODIS Collection 6 (C6) LAI/FPAR Product User’s Guide (April 21, 2020)
MODIS Collection 6.1 (C6.1) LAI/FPAR Product User’s Guide (April 21, 2021)

Confirmed products

  • Google Earth Engine: MODIS/006/MCD15A3H
  • EarthExplorer MCD15A2H V6
  • EarthExplorer MCD15A3H V6
  • EarthExplorer MOD15A2H V6
  • EarthExplorer MYD15A2H V6

MODIS Collection 6 LAI/FPAR Products FparExtra_QC

Product Identifer: MODIS_LaiFparV6_FparExtra_QC

Details

The MODIS Leaf Area Index (LAI) and Fraction of Photosynthetically Active Radiation (FPAR).

This and MODIS_LAIV6_FparLAI_QC both compliment each other.

There are several MODIS LAI/FPAR products which all use the same algorithms and resulting QA/QC info.

  • MOD15A2H - Terra/500m/8day
  • MYD15A2H - Aqua/500m/8day
  • MCD15A2H - Terra+Aqua/500m/8day
  • MCD15A3H - Terra+Aqua/500m/4day

Two recent versions, v006 and v0061, also have identical QA info for all 4 products.

Flag Descriptions

Bits Flag Name Description
0-1 LandSea 0 - LAND
1 - SHORE
2 - FRESHWATER
3 - OCEAN
2 Snow_Ice 0 - No snow/ice detected
1 - Snow/ice deteced
3 Aerosol 0 - No or low atmospheric aerosol levels detected
1 - Average or high aerosol levels detected
4 Cirrus 0 - No cirrus detected
1 - Cirrus was detected
5 Internal_CloudMask 0 - No clouds
1 - Clouds were detected
6 Cloud_Shadow 0 - No cloud shadow detected
1 - Cloud shadow detected
7 SCF_Biome_Mask 0 - Biome outside interval
1 - Biome in interval

References docs

MODIS Collection 6 (C6) LAI/FPAR Product User’s Guide (April 21, 2020)
MODIS Collection 6.1 (C6.1) LAI/FPAR Product User’s Guide (April 21, 2021)

Confirmed products

  • Google Earth Engine: MODIS/006/MCD15A3H
  • EarthExplorer MCD15A2H V6
  • EarthExplorer MCD15A3H V6
  • EarthExplorer MOD15A2H V6
  • EarthExplorer MYD15A2H V6