![NASA/VIIRS/002/VNP22Q2](https://developers.google.com/earth-engine/datasets/images/NASA/NASA_VIIRS_002_VNP22Q2_sample.png)

Dataset Availability
:   2013-01-01T00:00:00Z--2025-01-01T00:00:00Z

Dataset Producer
:


    [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/VIIRS/VNP22Q2.002)

Cadence
:   1 Year

Tags
:
    [land](https://developers.google.com/earth-engine/datasets/tags/land) [nasa](https://developers.google.com/earth-engine/datasets/tags/nasa) [ndvi](https://developers.google.com/earth-engine/datasets/tags/ndvi) [noaa](https://developers.google.com/earth-engine/datasets/tags/noaa) [npp](https://developers.google.com/earth-engine/datasets/tags/npp) [onset-greenness](https://developers.google.com/earth-engine/datasets/tags/onset-greenness) [phenology](https://developers.google.com/earth-engine/datasets/tags/phenology) [surface](https://developers.google.com/earth-engine/datasets/tags/surface) [vegetation](https://developers.google.com/earth-engine/datasets/tags/vegetation) [vegetation-indices](https://developers.google.com/earth-engine/datasets/tags/vegetation-indices) [viirs](https://developers.google.com/earth-engine/datasets/tags/viirs)

#### Description

The Suomi National Polar-Orbiting Partnership (Suomi NPP) NASA Visible
Infrared Imaging Radiometer Suite (VIIRS) Land Surface Phenology Yearly
(VNP22Q2) Version 2 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:

- [User's Guide](https://lpdaac.usgs.gov/documents/2263/VNP22_UserGuide_v2.pdf)

- [Algorithm Theoretical Basis Document (ATBD)](https://lpdaac.usgs.gov/documents/2228/VNP22_ATBD_V2.pdf)

- [General Documentation](https://doi.org/10.5067/VIIRS/VNP22Q2.002)

- [Land Product Quality Assessment website](https://landweb.modaps.eosdis.nasa.gov/browse?sensor=VIIRS&sat=SNPP)

### Bands

**Bands**

Pixel size: 500 meters (all bands)

| Name | Pixel Size | Description |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| `Date_Mid_Greenup_Phase_1` | 500 meters | Date at a mid-greenup phase |
| `Date_Mid_Senescence_Phase_1` | 500 meters | Date at a mid-senescence phase |
| `EVI2_Growing_Season_Area_1` | 500 meters | Integrated EVI2 during a growing season |
| `EVI2_Onset_Greenness_Increase_1` | 500 meters | EVI2 value at greenup onset |
| `EVI2_Onset_Greenness_Maximum_1` | 500 meters | EVI2 value at maturity onset |
| `GLSP_QC_1` | 500 meters | 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` | 500 meters | EVI2 agreement between modeled values and raw observations |
| `Growing_Season_Length_1` | 500 meters | Growing Season Length |
| `Onset_Greenness_Decrease_1` | 500 meters | Date at which canopy greenness begins to decrease |
| `Onset_Greenness_Increase_1` | 500 meters | Date of onset of greenness increase |
| `Onset_Greenness_Maximum_1` | 500 meters | Date at which canopy greenness approaches its seasonal maximum |
| `Onset_Greenness_Minimum_1` | 500 meters | Date at which canopy greenness reaches a minimum |
| `PGQ_Growing_Season_1` | 500 meters | Proportion of good quality of VIIRS observations during a vegetation growing season |
| `PGQ_Onset_Greenness_Decrease_1` | 500 meters | Proportion of good quality around senescence onset |
| `PGQ_Onset_Greenness_Increase_1` | 500 meters | Proportion of good quality around greenup onset |
| `PGQ_Onset_Greenness_Maximum_1` | 500 meters | Proportion of good quality around maturity onset |
| `PGQ_Onset_Greenness_Minimum_1` | 500 meters | Proportion of good quality around dormancy onset |
| `Rate_Greenness_Decrease_1` | 500 meters | Rates of change in EVI2 values during a senescence phase |
| `Rate_Greenness_Increase_1` | 500 meters | Rates of change in EVI2 values during a greenup phase |
| `Date_Mid_Greenup_Phase_2` | 500 meters | Date at a mid-greenup phase |
| `Date_Mid_Senescence_Phase_2` | 500 meters | Date at a mid-senescence phase |
| `EVI2_Growing_Season_Area_2` | 500 meters | Integrated EVI2 during a growing season |
| `EVI2_Onset_Greenness_Increase_2` | 500 meters | EVI2 value at greenup onset |
| `EVI2_Onset_Greenness_Maximum_2` | 500 meters | EVI2 value at maturity onset |
| `GLSP_QC_2` | 500 meters | 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` | 500 meters | EVI2 agreement between modeled values and raw observations |
| `Growing_Season_Length_2` | 500 meters | Growing Season Length |
| `Onset_Greenness_Decrease_2` | 500 meters | Date at which canopy greenness begins to decrease |
| `Onset_Greenness_Increase_2` | 500 meters | Date of onset of greenness increase |
| `Onset_Greenness_Maximum_2` | 500 meters | Date at which canopy greenness approaches its seasonal maximum |
| `Onset_Greenness_Minimum_2` | 500 meters | Date at which canopy greenness reaches a minimum |
| `PGQ_Growing_Season_2` | 500 meters | Proportion of good quality of VIIRS observations during a vegetation growing season |
| `PGQ_Onset_Greenness_Decrease_2` | 500 meters | Proportion of good quality around senescence onset |
| `PGQ_Onset_Greenness_Increase_2` | 500 meters | Proportion of good quality around greenup onset |
| `PGQ_Onset_Greenness_Maximum_2` | 500 meters | Proportion of good quality around maturity onset |
| `PGQ_Onset_Greenness_Minimum_2` | 500 meters | Proportion of good quality around dormancy onset |
| `Rate_Greenness_Decrease_2` | 500 meters | Rates of change in EVI2 values during a senescence phase |
| `Rate_Greenness_Increase_2` | 500 meters | Rates of change in EVI2 values during a greenup phase |

### Image Properties

**Image Properties**

| Name | Type | Description |
|---|---|---|
| num_tiles | INT | The number of source tiles that were mosaicked to create this image. |

### 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:

- Please visit [LP DAAC 'Citing Our Data' page](https://lpdaac.usgs.gov/citing_our_data)
  for information on citing LP DAAC datasets.

### DOIs

- <https://doi.org/10.5067/VIIRS/VNP22Q2.002>

### Explore with Earth Engine

> [!NOTE]
> **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)

### Code Editor (JavaScript)

```javascript
var dataset = ee.ImageCollection('NASA/VIIRS/002/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](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_VIIRS_002_VNP22Q2) [VNP22Q2.002: Land Surface Phenology Yearly L3 Global 500m SIN Grid](https://developers.google.com/earth-engine/datasets/catalog/NASA_VIIRS_002_VNP22Q2) The Suomi National Polar-Orbiting Partnership (Suomi NPP) NASA Visible Infrared Imaging Radiometer Suite (VIIRS) Land Surface Phenology Yearly (VNP22Q2) Version 2 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 ... NASA/VIIRS/002/VNP22Q2, land,nasa,ndvi,noaa,npp,onset-greenness,phenology,surface,vegetation,vegetation-indices,viirs 2013-01-01T00:00:00Z/2025-01-01T00:00:00Z -90 -180 90 180 Google Earth Engine https://developers.google.com/earth-engine/datasets

- [https://doi.org/10.5067/VIIRS/VNP22Q2.002](https://doi.org/https://doi.org/10.5067/VIIRS/VNP22Q2.002)
- [https://doi.org/10.5067/VIIRS/VNP22Q2.002](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_VIIRS_002_VNP22Q2)