The following Landsat derived GPP/NPP products are available:

landsat-30-gpp: Landsat 16-day GPP 1986-2017
landsat-30-npp: Landsat annual NPP 1986-2017

Data are also available on Google Earth Engine
landsat-30-gpp: https://developers.google.com/earth-engine/datasets/catalog/UMT_NTSG_v2_LANDSAT_GPP
landsat-30-npp: https://developers.google.com/earth-engine/datasets/catalog/UMT_NTSG_v2_LANDSAT_NPP

Landsat GPP and NPP are produced with the latest Landsat collections.

Data are scaled by 10,000. The table below describes the QC band values; please
see the paper for more detailed descriptions.

+-------------+-------------+--------------------------------------------+
|   Dataset   | Pixel Value |                Description                 |
+-------------+-------------+--------------------------------------------+
| Landsat GPP | 10          | Clear not smoothed                         |
|             | 11          | Clear smoothed                             |
|             | 20          | Snow or water not smoothed                 |
|             | 21          | Snow or water smoothed                     |
|             | 30          | Climatology not smoothed                   |
|             | 31          | Climatology smoothed                       |
|             | 40          | Gap filled not smoothed                    |
|             | 41          | Gap filled smoothed                        |
| Landsat NPP | 0 - 100     | Percentage of gap filled 16-day composites |
|             | 255         | Incomplete data (gap filling failed)       |
+-------------+-------------+--------------------------------------------+

The table below describes input differences from NASA MOD17.

+----------------+--------------------+------------------------+----------------------------+----------------------------+
|                |                    | NASA MOD17             | MODIS 250                  | Landsat                    |
+----------------+--------------------+------------------------+----------------------------+----------------------------+
| Input Variable | Units              | Source    | Resolution | Source        | Resolution | Source        | Resolution |
+----------------+--------------------+-----------+------------+---------------+------------+---------------+------------+
| VPD            | Pa                 | GMAO/NASA | 0.5°       | Idaho Metdata | 4 km       | Idaho Metdata | 4 km       |
+----------------+--------------------+-----------+------------+---------------+------------+---------------+------------+
| SWrad          | w m-2              | GMAO/NASA | 0.5°       | Idaho Metdata | 4 km       | Idaho Metdata | 4 km       |
+----------------+--------------------+-----------+------------+---------------+------------+---------------+------------+
| Tavg           | °C                 | GMAO/NASA | 0.5°       | Idaho Metdata | 4 km       | Idaho Metdata | 4 km       |
+----------------+--------------------+-----------+------------+---------------+------------+---------------+------------+
| Tmin           | °C                 | GMAO/NASA | 0.5°       | Idaho Metdata | 4 km       | Idaho Metdata | 4 km       |
+----------------+--------------------+-----------+------------+---------------+------------+---------------+------------+
| Land Cover     | na                 | MOD12Q1   | 500 m      | NLCD          | 30 m       | NLCD          | 30 m       |
+----------------+--------------------+-----------+------------+---------------+------------+---------------+------------+
| FPAR           | na                 | MOD15A2   | 500 m      | MOD09Q1       | 250 m      | Landsat SR    | 30 m       |
+----------------+--------------------+-----------+------------+---------------+------------+---------------+------------+
| LAI            | m2 leaf m-2 ground | MOD15A2   | 500 m      | MOD09Q1       | 250 m      | Landsat SR    | 30 m       |
+----------------+--------------------+-----------+------------+---------------+------------+---------------+------------+


To download a specific location, use the GDAL virtual file system. For example,
the following gdal_translate command will retrieve a small section of Montana
(see the gdal_translate documentation for more information):

GDAL_DISABLE_READDIR_ON_OPEN=YES CPL_VSIL_CURL_ALLOWED_EXTENSIONS=tif \
gdal_translate -co compress=lzw -co tiled=yes \
/vsicurl/http://files.ntsg.umt.edu/data/Landsat_Productivity/landsat-30-npp/landsat-30-npp-2017.tif \
-projwin -108 48 -107 47 out.tif


Robinson, N.P., B.W. Allred, W.K. Smith, M.O. Jones, A. Moreno, T.A. Erickson,
D.E. Naugle, and S.W. Running. 2018. Terrestrial primary production for the
conterminous United States derived from Landsat 30 m and MODIS 250 m. Remote
Sensing in Ecology and Conservation. https://dx.doi.org/10.1002/rse2.74


Contact: Brady Allred allredbw@gmail.com

Changelog
=========
2018-03-02 Provisional data release, version 0.2.0