MOD16A2GF.061: Terra Net Evapotranspiration Gap-Filled 8-Day Global 500m

AI-generated Key Takeaways

• The MOD16A2GF V6.1 product provides 8-day global evapotranspiration and latent heat flux data at 500m resolution from 2000 to 2023.

• It's based on the Penman-Monteith equation, utilizing MODIS and meteorological data to estimate total and potential evapotranspiration/latent heat flux.

• The data is gap-filled to provide year-round coverage and includes quality control flags.

• This NASA dataset is freely available for use, sale, and redistribution without restrictions via the LP DAAC.

• Users can access and analyze the dataset through Google Earth Engine.

Dataset Availability

2000-01-01T00:00:00Z–2024-12-26T00:00:00Z

Dataset Provider

NASA LP DAAC at the USGS EROS Center

Earth Engine Snippet

ee.ImageCollection("MODIS/061/MOD16A2GF")

Cadence

8 Days

Tags

8-day evapotranspiration global modis nasa water-vapor

Description

The Terra Moderate Resolution Imaging Spectroradiometer (MODIS) MOD16A2GF Version 6.1 Evapotranspiration/Latent Heat Flux (ET/LE) product is a year-end gap-filled 8-day composite dataset produced at 500 meter (m) pixel resolution. The algorithm used for the MOD16 data product collection is based on the logic of the Penman-Monteith equation, which includes inputs of daily meteorological reanalysis data along with MODIS remotely sensed data products such as vegetation property dynamics, albedo, and land cover.

The pixel values for the two Evapotranspiration layers (ET and PET) are the sum of all eight days within the composite period, and the pixel values for the two Latent Heat layers (LE and PLE) are the average of all eight days within the composite period. The last acquisition period of each year is a 5 or 6-day composite period, depending on the year.

Documentation:

• User's Guide

• Algorithm Theoretical Basis Document (ATBD)

• General Documentation

Bands

Pixel Size
500 meters

Bands

Name	Units	Min	Max	Scale	Pixel Size	Description
ET	kg/m^2/8day	-32767	32700	0.1	meters	Total evapotranspiration
LE	J/m^2/day	-32767	32700	10000	meters	Average latent heat flux
PET	kg/m^2/8day	-32767	32700	0.1	meters	Total potential evapotranspiration
PLE	J/m^2/day	-32767	32700	10000	meters	Average potential latent heat flux
ET_QC					meters	Evapotranspiration quality control flags
Bitmask for ET_QC Bit 0: MODLAND_QC bits 0: Good quality (main algorithm with or without saturation) 1: Other quality (back-up algorithm or fill values) Bit 1: Sensor 0: Terra 1: Aqua Bit 2: Dead detector 0: Detectors apparently fine for up to 50% of channels 1, 2 1: Dead detectors caused >50% adjacent detector retrieval Bits 3-4: Cloud state 0: Significant clouds NOT present (clear) 1: Significant clouds WERE present 2: Mixed cloud present on pixel 3: Cloud state not defined, assumed clear Bits 5-7: SCF_QC 5-level confidence quality score 0: Main (RT) method used, best result possible (no saturation) 1: Main (RT) method used with saturation. Good, 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)

Terms of Use

Terms of Use

MODIS data and products acquired through the LP DAAC have no restrictions on subsequent use, sale, or redistribution.

Citations

Citations:

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

DOIs

• https://doi.org/10.5067/MODIS/MOD16A2GF.061

Explore with Earth Engine

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Code Editor (JavaScript)

var dataset = ee.ImageCollection('MODIS/061/MOD16A2GF')
                  .filter(ee.Filter.date('2022-01-01', '2022-05-01'));
var evapotranspiration = dataset.select('ET');
var evapotranspirationVis = {
  min: 0,
  max: 300,
  palette: [
    'ffffff', 'fcd163', '99b718', '66a000', '3e8601', '207401', '056201',
    '004c00', '011301'
  ],
};
Map.setCenter(0, 0, 2);
Map.addLayer(evapotranspiration, evapotranspirationVis, 'Evapotranspiration');

Open in Code Editor

MOD16A2GF.061: Terra Net Evapotranspiration Gap-Filled 8-Day Global 500m

The Terra Moderate Resolution Imaging Spectroradiometer (MODIS) MOD16A2GF Version 6.1 Evapotranspiration/Latent Heat Flux (ET/LE) product is a year-end gap-filled 8-day composite dataset produced at 500 meter (m) pixel resolution. The algorithm used for the MOD16 data product collection is based on the logic of the Penman-Monteith equation, which includes inputs …

MODIS/061/MOD16A2GF, 8-day,evapotranspiration,global,modis,nasa,water-vapor

2000-01-01T00:00:00Z/2024-12-26T00:00:00Z

-90 -180 90 180

Google Earth Engine

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

• https://doi.org/10.5067/MODIS/MOD16A2GF.061
• https://doi.org/10.5067/MODIS/MOD16A2GF.061