MCD12Q2 v006

MODIS/Terra and Aqua Land Cover Dynamics Yearly L3 Global 500 m SIN Grid


PI: Josh Gray, Damien Sulla-Menashe, and Mark Friedl

Description

The Terra and Aqua combined Moderate Resolution Imaging Spectroradiometer (MODIS) Land Cover Dynamics (MCD12Q2) Version 6 data product provides global land surface phenology metrics at yearly intervals from 2001 to 2017. The MCD12Q2 Version 6 data product is derived from time series of the 2-band Enhanced Vegetation Index (EVI2) calculated from MODIS Nadir Bidirectional Reflectance Distribution Function (BRDF)-Adjusted Reflectance (NBAR). Vegetation phenology metrics at 500 meter spatial resolution are identified for up to two detected growing cycles per year. For pixels with more than two valid vegetation cycles, the data represent the two cycles with the largest NBAR-EVI2 amplitudes.

Provided in each MCD12Q2 Version 6 Hierarchical Data Format 4 (HDF4) file are layers for the total number of vegetation cycles detected for the product year, the onset of greenness, greenup midpoint, maturity, peak greenness, senescence, greendown midpoint, dormancy, EVI2 minimum, EVI2 amplitude, integrated EVI2 over a vegetation cycle, as well as overall and phenology metric-specific quality information. A low-resolution browse image showing greenup is also available when viewing each MCD12Q2 granule. SDS layers may be multi-dimensional with up to two valid vegetation cycles.

For areas where the NBAR-EVI2 values are missing due to cloud cover or other reasons, the data gaps are filled with good quality NBAR-EVI2 values from the year directly preceding or following the product year.

Characteristics

Improvements/Changes from Previous Versions

  • Additional Science Dataset (SDS) layers were included in Version 6.
  • Changes were implemented to better capture phenometrics in systems with multiple vegetation cycles per year.
  • Version 6 methodological approach increased the reliability of retrieved phenometrics in tropical, arid, and semi-arid ecosystems.
  • Modifications were designed to more accurately represent phenometrics in systems where NBAR-EVI2 time series do not closely resemble logistic growth patterns.
  • Version 6 delivers phenometrics in a more usable and intuitive way when vegetation cycles cross calendar boundaries, particularly in the Southern Hemisphere.
  • Vegetation cycles in a product year are determined by the date of peak NBAR-EVI2 within the product’s calendar year.
  • Date representation changed to days since January 1, 1970.
  • Overall quality improvements with phenometric-specific quality layers provided.

Product Maturity

Validation at stage 2 has been achieved for MODIS land cover products.

Collection and Granule

Collection

Characteristic Description
CollectionCombined MODIS
DOI10.5067/MODIS/MCD12Q2.006
File Size~250 MB
Temporal ResolutionYearly
Temporal Extent2001-01-01 to 2017-12-31
Spatial ExtentGlobal
Coordinate SystemSinusoidal
DatumN/A
File FormatHDF-EOS
Geographic Dimensions1200 km x 1200 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers13
Columns/Rows2400 x 2400
Pixel Size500 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
NumCycles Total number of valid vegetation cycles with peak in product year Number 16-bit signed integer 32767 N/A 0 to 7 N/A
Greenup¹ Date when EVI2 first crossed 15% of the segment EVI2 amplitude Day 16-bit signed integer 32767 N/A 11138 to 32766 N/A
MidGreenup¹ Date when EVI2 first crossed 50% of the segment EVI2 amplitude Day 16-bit signed integer 32767 N/A 11138 to 32766 N/A
Peak¹ Date when EVI2 reached the segment maximum Day 16-bit signed integer 32767 N/A 11138 to 32766 N/A
Maturity¹ Date when EVI2 first crossed 90% of the segment EVI2 amplitude Day 16-bit signed integer 32767 N/A 11138 to 32766 N/A
MidGreendown¹ Date when EVI2 last crossed 50% of the segment EVI2 amplitude Day 16-bit signed integer 32767 N/A 11138 to 32766 N/A
Senescence¹ Date when EVI2 last crossed 90% of the segment EVI2 amplitude Day 16-bit signed integer 32767 N/A 11138 to 32766 N/A
Dormancy¹ Date when EVI2 last crossed 15% of the segment EVI2 amplitude Day 16-bit signed integer 32767 N/A 11138 to 32766 N/A
EVI_Minimum Segment minimum EVI2 value EVI2 16-bit signed integer 32767 N/A 0 to 10000 0.0001
EVI_Amplitude Segment maximum - minimum EVI2 EVI2 16-bit signed integer 32767 N/A 0 to 10000 0.0001
EVI_Area Sum of daily interpolated EVI2 from Greenup to Dormancy EVI2 16-bit signed integer 32767 N/A 0 to 3700 0.1
QA_Overall QA code for entire segment Class 16-bit signed integer 32767 N/A 0 to 3 N/A
QA_Detailed Bit-packed, SDS-specific QA codes Bit Field 16-bit signed integer 32767 N/A 0 to 16383 N/A

¹Phenometric-specific units are days since January 1, 1970.

QA Overall Class Values

Value Description
0 Best
1 Good
2 Fair
3 Poor

Product Quality

Quality information is provided on page 8 of the User Guide.

Known Issues

Known issues are described on pages 5 and 6 of the User Guide.

Documentation

Using the Data

Data In Action

Highlights from the Literature: October to December 2018

Tools

Citation

DOI: 10.5067/MODIS/MCD12Q2.006

About the Image

EVI2 over the Great Lakes Region, United States, 2016.