VNP22Q2: Land Surface Phenology Yearly L3 Global 500m SIN Grid

Dataset Availability: 2013-01-01T00:00:00Z–2022-01-01T00:00:00Z
Dataset Provider: NASA LP DAAC at the USGS EROS Center
Earth Engine Snippet: ee.ImageCollection("NOAA/VIIRS/001/VNP22Q2")

Cadence: 8 Days
Tags: land nasa ndvi noaa npp onset-greenness phenology surface vegetation viirs

Description

The Suomi National Polar-Orbiting Partnership (Suomi NPP) NASA Visible Infrared Imaging Radiometer Suite (VIIRS) Land Cover Dynamics data product provides global land surface phenology (GLSP) metrics at yearly intervals. The VNP22Q2 data product is derived from time series of the two-band Enhanced Vegetation Index (EVI2) calculated from VIIRS 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.

The product contains six phenological transition dates: onset of greenness increase, onset of greenness maximum, onset of greenness decrease, onset of greenness minimum, dates of mid-greenup, and senescence phases. The product also includes the growing season length. The greenness-related metrics consist of EVI2 onset of greenness increase, EVI2 onset of greenness maximum, EVI2 growing season, rate of greenness increase, and rate of greenness decrease. The confidence of phenology detection is provided as greenness agreement growing season, proportion of good quality (PGQ) growing season, PGQ onset greenness increase, PGQ onset greenness maximum, PGQ onset greenness decrease, and PGQ onset greenness minimum. The final layer is quality control specifying the overall quality of the product.

Documentation:

Bands

Resolution
500 meters

Bands

Name	Description
`Date_Mid_Greenup_Phase_1`	Date at a mid-greenup phase
`Date_Mid_Senescence_Phase_1`	Date at a mid-senescence phase
`EVI2_Growing_Season_Area_1`	Integrated EVI2 during a growing season
`EVI2_Onset_Greenness_Increase_1`	EVI2 value at greenup onset
`EVI2_Onset_Greenness_Maximum_1`	EVI2 value at maturity onset
`GLSP_QC_1`	Global Land Surface Phenology Quality Control
Bitmask for GLSP_QC_1 Bits 0-2: Mandatory Quality 0: processed, good quality 1: processed, other quality 2: processed, backup algorithm 3: not processed, bad quality 4: not processed, other Bits 3-4: TBD Bits 5-7: 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
`Greenness_Agreement_Growing_Season_1`	EVI2 agreement between modeled values and raw observations
`Growing_Season_Length_1`	Growing Season Length
`Onset_Greenness_Decrease_1`	Date at which canopy greenness begins to decrease
`Onset_Greenness_Increase_1`	Date of onset of greenness increase
`Onset_Greenness_Maximum_1`	Date at which canopy greenness approaches its seasonal maximum
`Onset_Greenness_Minimum_1`	Date at which canopy greenness reaches a minimum
`PGQ_Growing_Season_1`	Proportion of good quality of VIIRS observations during a vegetation growing season
`PGQ_Onset_Greenness_Decrease_1`	Proportion of good quality around senescence onset
`PGQ_Onset_Greenness_Increase_1`	Proportion of good quality around greenup onset
`PGQ_Onset_Greenness_Maximum_1`	Proportion of good quality around maturity onset
`PGQ_Onset_Greenness_Minimum_1`	Proportion of good quality around dormancy onset
`Rate_Greenness_Decrease_1`	Rates of change in EVI2 values during a senescence phase
`Rate_Greenness_Increase_1`	Rates of change in EVI2 values during a greenup phase
`Date_Mid_Greenup_Phase_2`	Date at a mid-greenup phase
`Date_Mid_Senescence_Phase_2`	Date at a mid-senescence phase
`EVI2_Growing_Season_Area_2`	Integrated EVI2 during a growing season
`EVI2_Onset_Greenness_Increase_2`	EVI2 value at greenup onset
`EVI2_Onset_Greenness_Maximum_2`	EVI2 value at maturity onset
`GLSP_QC_2`	Global Land Surface Phenology Quality Control
Bitmask for GLSP_QC_2 Bits 0-2: Mandatory Quality 0: processed, good quality 1: processed, other quality 2: processed, backup algorithm 3: not processed, bad quality 4: not processed, other Bits 3-4: TBD Bits 5-7: 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
`Greenness_Agreement_Growing_Season_2`	EVI2 agreement between modeled values and raw observations
`Growing_Season_Length_2`	Growing Season Length
`Onset_Greenness_Decrease_2`	Date at which canopy greenness begins to decrease
`Onset_Greenness_Increase_2`	Date of onset of greenness increase
`Onset_Greenness_Maximum_2`	Date at which canopy greenness approaches its seasonal maximum
`Onset_Greenness_Minimum_2`	Date at which canopy greenness reaches a minimum
`PGQ_Growing_Season_2`	Proportion of good quality of VIIRS observations during a vegetation growing season
`PGQ_Onset_Greenness_Decrease_2`	Proportion of good quality around senescence onset
`PGQ_Onset_Greenness_Increase_2`	Proportion of good quality around greenup onset
`PGQ_Onset_Greenness_Maximum_2`	Proportion of good quality around maturity onset
`PGQ_Onset_Greenness_Minimum_2`	Proportion of good quality around dormancy onset
`Rate_Greenness_Decrease_2`	Rates of change in EVI2 values during a senescence phase
`Rate_Greenness_Increase_2`	Rates of change in EVI2 values during a greenup phase

Terms of Use

Terms of Use

LP DAAC NASA data are freely accessible; however, when an author publishes these data or works based on the data, it is requested that the author cite the datasets within the text of the publication and include a reference to them in the reference list.

Citations

Please visit LP DAAC 'Citing Our Data' page for information on citing LP DAAC datasets.

DOIs

https://doi.org/10.5067/VIIRS/VNP22Q2.001

Explore with Earth Engine

Code Editor (JavaScript)

var dataset = ee.ImageCollection('NOAA/VIIRS/001/VNP22Q2')
                  .filter(ee.Filter.date('2017-01-01', '2017-12-31'));
var rgb = dataset.select([
  'EVI2_Growing_Season_Area_1',
  'PGQ_Growing_Season_1',
  'Greenness_Agreement_Growing_Season_1']);
var rgbVis = {
  min: [0, 0, 0],
  max: [75, 150, 200],
};
Map.setCenter(17.93, 7.71, 4);
Map.addLayer(rgb, rgbVis, 'False color');

Open in Code Editor

VNP22Q2: Land Surface Phenology Yearly L3 Global 500m SIN Grid

NOAA/VIIRS/001/VNP22Q2, land,nasa,ndvi,noaa,npp,onset-greenness,phenology,surface,vegetation,viirs

2013-01-01T00:00:00Z/2022-01-01T00:00:00Z

Google Earth Engine

https://developers.google.com/earth-engine/datasets

https://doi.org/10.5067/VIIRS/VNP22Q2.001