The Large Scale Hydrology Lab specializes in advancing global and
regional water cycle research by synthesizing multi-source Earth
observations with process-based modeling. We are widely recognized
for the Penman-Monteith-Leuning (PML) model and its high-accuracy,
long-term evapotranspiration (ET) and gross primary productivity
(GPP) products.

By integrating remote sensing, machine learning, and surface process
modeling, our goal is to provide essential data infrastructure for
monitoring water-carbon coupling and understanding climate change
impacts at a global scale.
[![Catalog Owner Logo](https://developers.google.com/static/earth-engine/datasets/logos/pml_evapotranspiration_logo.png)](https://zhang-hydrolab.github.io/)
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  | [### PML_V2.2a: Coupled Evapotranspiration and Gross Primary Product (MODIS Edition) ![](https://developers.google.com/earth-engine/datasets/images/pml_evapotranspiration/projects_pml_evapotranspiration_PML_OUTPUT_PML_V22a_sample.png)](https://developers.google.com/earth-engine/datasets/catalog/projects_pml_evapotranspiration_PML_OUTPUT_PML_V22a) |
  | The dataset is produced by the Large Scale Hydrology Lab, which specializes in advancing global and regional water cycle research by synthesizing multi-source Earth observations with process-based modeling. The PML-V2.2a (MODIS Edition) product provides global terrestrial evapotranspiration (ET) and gross primary production (GPP) at a ... |
  | [evapotranspiration](https://developers.google.com/earth-engine/datasets/tags/evapotranspiration) [gpp](https://developers.google.com/earth-engine/datasets/tags/gpp) [plant-productivity](https://developers.google.com/earth-engine/datasets/tags/plant-productivity) [pml-evapotranspiration](https://developers.google.com/earth-engine/datasets/tags/pml-evapotranspiration) [publisher-dataset](https://developers.google.com/earth-engine/datasets/tags/publisher-dataset) [water-vapor](https://developers.google.com/earth-engine/datasets/tags/water-vapor) |

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  | [### PML_V2.2a: Coupled Evapotranspiration and Gross Primary Product (VIIRS Edition) ![](https://developers.google.com/earth-engine/datasets/images/pml_evapotranspiration/projects_pml_evapotranspiration_PML_OUTPUT_PML_V22a_VIIRS_sample.png)](https://developers.google.com/earth-engine/datasets/catalog/projects_pml_evapotranspiration_PML_OUTPUT_PML_V22a_VIIRS) |
  | The dataset is produced by the Large Scale Hydrology Lab, which specializes in advancing global and regional water cycle research by synthesizing multi-source Earth observations with process-based modeling. The PML-V2.2a (VIIRS Edition) product provides global terrestrial evapotranspiration (ET) and gross primary production (GPP) at a ... |
  | [evapotranspiration](https://developers.google.com/earth-engine/datasets/tags/evapotranspiration) [gpp](https://developers.google.com/earth-engine/datasets/tags/gpp) [plant-productivity](https://developers.google.com/earth-engine/datasets/tags/plant-productivity) [pml-evapotranspiration](https://developers.google.com/earth-engine/datasets/tags/pml-evapotranspiration) [publisher-dataset](https://developers.google.com/earth-engine/datasets/tags/publisher-dataset) [water-vapor](https://developers.google.com/earth-engine/datasets/tags/water-vapor) |