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

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NOAA/VIIRS/001/VNP22Q2
Dataset Availability
2013-01-01T00:00:00Z–2021-01-01T00:00:00
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NOAA/VIIRS/001/VNP22Q2")
Tags
land nasa ndvi noaa npp 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

Date at a mid-greenup phase

Date_Mid_Senescence_Phase

Date at a mid-senescence phase

EVI2_Growing_Season_Area

Integrated EVI2 during a growing season

EVI2_Onset_Greenness_Increase

EVI2 value at greenup onset

EVI2_Onset_Greenness_Maximum

EVI2 value at maturity onset

GLSP_QC

Global Land Surface Phenology Quality Control

Greenness_Agreement_Growing_Season

EVI2 agreement between modeled values and raw observations

Growing_Season_Length

Growing Season Length

Onset_Greenness_Decrease

Date at which canopy greenness begins to decrease

Onset_Greenness_Increase

Date of onset of greenness increase

Onset_Greenness_Maximum

Date at which canopy greenness approaches its seasonal maximum

Onset_Greenness_Minimum

Date at which canopy greenness reaches a minimum

PGQ_Growing_Season

Proportion of good quality of VIIRS observations during a vegetation growing season

PGQ_Onset_Greenness_Decrease

Proportion of good quality around senescence onset

PGQ_Onset_Greenness_Increase

Proportion of good quality around greenup onset

PGQ_Onset_Greenness_Maximum

Proportion of good quality around maturity onset

PGQ_Onset_Greenness_Minimum

Proportion of good quality around dormancy onset

Rate_Greenness_Decrease

Rates of change in EVI2 values during a senescence phase

Rate_Greenness_Increase

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

Citations:

DOIs

Explore in Earth Engine

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',
  'PGQ_Growing_Season',
  'Greenness_Agreement_Growing_Season']);
var rgbVis = {
  min: [0, 0, 0],
  max: [75, 150, 200],
};
Map.setCenter(17.93, 7.71, 4);
Map.addLayer(rgb, rgbVis, 'False color');