An Unexpectedly Large Count of Trees in the West African Sahara and Sahel
This dataset provides georeferenced polygon vectors of individual tree canopy geometries for dryland areas in West African Sahara and Sahel that were derived using deep learning applied to 50-cm resolution satellite imagery. More than 1.8 billion non-forest trees (i.e., woody plants with a crown size over 3 m2) over about 1.3 million km2 were identified from panchromatic and pansharpened normalized difference vegetation index (NDVI) images at 0.5-m spatial resolution using an automatic tree detection framework based on supervised deep-learning techniques. Combined with existing and future fieldwork, these data lay the foundation for a comprehensive database that contains information on all individual trees outside of forests and could provide accurate estimates of woody carbon in arid and semi-arid areas throughout the Earth for the first time.
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| Spatial Extent: | Bounding Rectangle: N: 24.03 S: 11.35 E: -5.49 W: -18.0 |
Data Format(s): | Distribution: Binary |
| Temporal Extent: | Platform(s): | Environmental Modeling | |
| Data Center(s): | ORNL_DAAC | Instrument(s): | Computer |
| Version: | 1 | ||
- Other Citation Details: Brandt, M., C.J. Tucker, A. Kariryaa, K. Rasmussen, C. Abel, J.L. Small, J. Chave, L.V. Rasmussen, P. Hiernaux, A.A. Diouf, L. Kergoat, O. Mertz, C. Igel, F. Gieseke, J. Schöning, S. Li, K.A. Melocik, J.R. Meyer, S. Sinno, E. Romero, E.N. Glennie, A. Montagu, M. Dendoncker, and R. Fensholt. 2020. An Unexpectedly Large Count of Trees in the West African Sahara and Sahel. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1832
- GENERAL DOCUMENTATION: https://daac.ornl.gov/VEGETATION/guides/Non-Forest_Trees_Sahara_Sahel.html, ORNL DAAC Data Set Documentation
- GENERAL DOCUMENTATION: https://daac.ornl.gov/daacdata/global_vegetation/Non-Forest_Trees_Sahara_Sahel/comp/gpkg_to_esri.py, An Unexpectedly Large Count of Trees in the West African Sahara and Sahel: gpkg_to_esri.py
- GENERAL DOCUMENTATION: https://daac.ornl.gov/daacdata/global_vegetation/Non-Forest_Trees_Sahara_Sahel/comp/Non-Forest_Trees_Sahara_Sahel.pdf, An Unexpectedly Large Count of Trees in the West African Sahara and Sahel: Non-Forest_Trees_Sahara_Sahel.pdf
Collection Information
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DOI
10.3334/ORNLDAAC/1832
https://doi.org
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Processing Level
4
model products
- Quality
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Collection Progress
Complete
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Related URLs
Acquisition Information
Projects
| Project Short Name | Campaigns | Project Dates |
|---|---|---|
| Vegetation | No campaigns listed. | No dates provided. |
Temporal Information
Spatial Information
| Coverage Type | Zone Identifier | Geometry | Granule Representation |
|---|---|---|---|
| HORIZONTAL | CARTESIAN | CARTESIAN |
Location Keywords
- CONTINENT
- AFRICA
- WESTERN AFRICA
Data Centers
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ORNL_DAAC
ARCHIVER-
ORNL DAAC User Services Office, P.O. Box 2008, MS 6407, Oak Ridge National Laboratory
Oak Ridge, Tennessee 37831-6407
(865) 241-3952
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Archive And Distribution Information
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Format: Binary
Format Type: Native
Fees: 0