MOD17A3.055: Terra Net Primary Production Yearly Global 1km (MODIS/055/MOD17A3)
Version V055
The MOD17A3 V055 product provides information about
annual Gross and Net Primary Productivity (NPP) at 1km pixel resolution.
Net Primary Productivity (NPP) defines the rate at which all plants
in an ecosystem produce net useful chemical energy. In other words,
NPP is equal to the difference between the rate at which plants
in an ecosystem produce useful chemical energy (or GPP), and the
rate at which they expend some of that energy for respiration.
The version 055 of the NPP product is produced by the Numerical
Terradynamic Simulation Group (NTSG),
University of Montana (UMT). It corrects the problem with cloud-contaminated
MODIS LAI-FPAR inputs to the MOD17 algorithm. The original, uncorrected
datasets constitute the version 4 NPP products. For further details
regarding the differences between the NTSG and NASA versions of
this product, please consult this document
| Name | Description | Gee Unit | Gee Scale |
|---|---|---|---|
| Gpp | Annual gross primary productivity | kg*C/m^2 | 0.0001 |
| Npp | Annual net primary productivity | kg*C/m^2 | 0.0001 |
| Gpp_Npp_QC | Percentage of filled MOD15 LAI caused by cloud-contamination during a growing season (defined when daily minimum air temperatures are above -8°) in a year. A high value indicates a high frequency of cloud-contamination. For example, QA is high for tropical rainforests but low in arid areas. | % |
Providers | |
|---|---|
| NASA LP DAAC at the USGS EROS Center (producer, licensor) | |
| Google Earth Engine (host) | |
| STAC Version | 0.6.0 |
| Keywords | global, gpp, mod17a3, modis, npp, photosynthesis, productivity, psn, terra, yearly |
| License | proprietary |
| Temporal Extent | 12/31/1999, 4:00:00 PM - now |
| Citation | Please visit [LP DAAC 'Citing Our Data' page](https://lpdaac.usgs.gov/citing_our_data) for information on citing LP DAAC datasets. |
| Type | image_collection |
| GSD | metersm |
| Platform | Terra |
| Instrument | MODIS |
| Cadence | year |