Ensemble Machine Learning Prediction of Potential FAPAR: Monthly time-series 2021 and Long-Term Comparison with Actual FAPAR

General Description

The dataset contains composites at 250 m spatial resolution of (1)  monthly potential FAPAR for the year 2021 from ensemble ML model predictions, (2) the model deviance for each prediction, (3) the yearly average of potential FAPAR, (4) the yearly average of actual FAPAR and (5) the yearly average of the difference between actual and potential (actual minus potential) FAPAR. The dataset is based on the 95th percentile of the monthly aggregated FAPAR derived from 250 m 8 d GLASS V6 FAPAR. Potential FAPAR was predicted by fitting an ensemble ML model using globally distributed training points (cca 3 Mio) and a set of 52 biophysical covariates including several layers related to human pressure. The code for modeling potential FAPAR is openly available at https://github.com/Open-Earth-Monitor/Global_FAPAR_250m. The dataset can be used in many applications like land degradation modeling, land productivity mapping, and land potential mapping. 

Data Details

• Time period: January 2021 - December 2021
• Type of data: Fraction of Absorbed Photosynthetically Active Radiation (FAPAR)
• How the data was collected or derived: Derived from 250m 8 d GLASS V6 FAPAR
• Statistical methods used: Ensemble machine learning
• Limitations or exclusions in the data: The dataset does not include data for Antarctica.
• Coordinate reference system: EPSG:4326
• Bounding box (Xmin, Ymin, Xmax, Ymax): (-180.00000, -62.0008094, 179.9999424, 87.37000)
• Spatial resolution: 1/480 d.d. = 0.00208333 (250m)
• Image size: 172,800 x 71,698
• File format: Cloud Optimized Geotiff (COG) format.

Support

If you discover a bug, artifact, or inconsistency, or if you have a question please raise a GitHub issue: https://github.com/Open-Earth-Monitor/Global_FAPAR_250m/issues

Reference

Hackländer, J., Parente, L., Ho, Y.-F., Hengl, T., Simoes, R., Consoli, D., Şahin, M., Tian, X., Herold, M., Jung, M., Duveiller, G., Weynants, M., Wheeler, I., (2023?) "Land potential assessment and trend-analysis using 2000–2021 FAPAR monthly time-series at 250 m spatial resolution", submitted to PeerJ, preprint available at: https://doi.org/10.21203/rs.3.rs-3415685/v1

Name convention

To ensure consistency and ease of use across and within the projects, we follow the standard Open-Earth-Monitor file-naming convention. The convention works with 10 fields that describes important properties of the data. In this way users can search files, prepare data analysis etc, without needing to open files. The fields are:

1. generic variable name: pot.fapar = Potential Fraction of Absorbed Photosynthetically Active Radiation
2. variable procedure combination: eml = ensemble machine learning
3. Position in the probability distribution / variable type: m = mean
4. Spatial support: 250m
5. Depth reference: s = surface
6. Time reference begin time: 20210101 = 2021-01-01
7. Time reference end time: 20211231 = 2021-12-31
8. Bounding box: go = global (without Antarctica)
9. EPSG code: epsg.4326 = EPSG:4326
10. Version code: v20230924 = 2023-09-24 (creation date)