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agro-forestry airphotos analysis Annex aspects boundaries Calliandra clay climate common methodologies conservation database developed drainage ecological ecosystems erosion estimated example factor ratings field forest land evaluation forestry fuelwood geographic information systems geology guidelines horizon humus profile ILWIS Indonesia information systems ISRIC land characteristics land cover land elements land improvements land inventory Land mapping unit land qualities land units land utilization types landform/soil landforms legend LURs Meijerink Mineral soil profile natural forest Netherlands Netherlands Soil Survey NTIM parent material plant plantations Pyroclastic rocks reconnaissance Reeuwijk relevant remote sensing material rocks sampling scale slope soil classification Soil Map soil profile Soil Science Soil Survey Soil Survey Institute soils and vegetation Sombroek Source species specified stony structure suitability surface survey area Table terrain text figure texture TIM-N timber tion trees TROPENBOS Programme tropical forest Unesco Wageningen Zone Zonneveld