A localised AGC model using WorldView-3 imagery is calibrated to coarser resolution Landsat 8 imagery and applied to the thicket biome (South Africa) using Google Earth Engine. This is a concept demonstration - AGC accuracy is not known outside the WorldView-3 model study area.
- Map visualisation is available here as a Google Earth Engine App. Give it a minute to generate the AGC estimates.
| File | Description |
|---|---|
| data/inputs/geospatial/gef_calib_plots.geojson | AGC estimates (ground truth) for plots in the GEF-5 SLM study area. |
| data/inputs/geospatial/step_arid_and_valley_thicket.zip | Boundaries of combined arid and valley thicket types. |
| Script | Description |
|---|---|
| scripts/calibrate_agc_model.js | Calibrate the WorldView-3 AGC model to Landsat 8 imagery and evaluate. |
| scripts/generate_agc_map_ui.js | Apply the calibrated AGC model to the biome and visualise the results. |
The calibrated Landsat 8 AGC model produced a RMSE of 3.35 tC/ha, and an R2 of 0.93, on 20 ground truth plots in the GEF-5 SLM study area. Arid and valley thicket types cover 3.65 million ha, with an average AGC of 20.57 tC/ha. Further ground truth and modelling work is required to establish AGC accuracy across the biome.
A screenshot of the visualisation app is shown below.
- Code is licensed under the AGPLv3.
- All data, used and produced by the software, is licensed under the CC BY-NC-SA.
For use of the code or map, please cite:
- Dugal Harris, Cosman Bolus, James Reeler, "Very high resolution aboveground carbon mapping in subtropical thicket," Journal of Applied Remote Sensing. 15(3), 038502 (2021), doi: 10.1117/1.JRS.15.038502
- Thicket boundaries were derived from the STEP vegetation map.
- The WorldView-3 AGC model was produced as part of the GEF-5 SLM project.