Some technical details for map creation
1. Land mask... A 1km land mask has been provided by gsp and is available here ftp://gsp.isric2.org/ (username: gsp, password: gspisric)
2. Covariates... Detailed information on where to obtain covariate layers for parent material, topography, climate and vegetation re provided in the cookbook on pages 20-27
3. Upscaling... effect of water bodies Mask layers for water bodies and bedrock will be incorporated into the combined grid at 250m resolution. This will affect the carbon concentrations for the 1km grid.
4. Uncertainty... A discussion of uncertainty is provided on the second last page of the cookbook.