| http://www.w3.org/ns/prov#value | - Determining fill volume is complicated by the fact that its bulk density is unknown, that the soil is mixed with harvest residues, that it is displaced over a larger downhill area especially in steep terrain, and objects such as boulders or stumps can have been made visible above the ALS terrain model.Due to low laser penetration through the dense forest canopy, the ALS data was sparse in comparis
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