Land FORM

Basic landform classes stratifying hydrologic processes, geomorphic origin (anthropogenic, natural), shape (slope, mound, basin, channel), and dominant soil formation and sedimentary process.
codenamedescriptionpositionform
AN
AnthropogenicAnthropogenic earthen or sealed structures and surfaces.ManyImpermeable
BP
Bench PlateauNatural bench plateaus- common in Sichuan.>5m above floodline0 - 30% Slope between steep slopes
CA
Small CanalFlowing anthropogenic watercourse >1m deep (<30m width).>1m below low waterChannel
CB
Large CanalFlowing anthropogenic watercourse >1m deep (>30m width).>1m below low waterChannel
CM
Canal MarginMargins of Flowing anthropogenic watercourse <1m deep. floodline to 1m below low waterSloping
EX
ExcavatedExcavated earthworks; including Mines & Pits (>30m width).>2m deepBasin
FM
Flowing MarshSlowly flowing waterbody <1m deep; wet all year, may be anthropogenic or natural.usually in floodplain, 0 to -1m belowChannel
FP
FloodplainRiver floodplains.0 to 5m above floodline<3% slope
FS
Foot SlopeFlat areas at bottom of hills with non-alluvial soils.>5m above floodline<5% Slope
LA
LakeLentic waterbody >1m deep (>30m width).>1m below low waterLentic
MA
MarshLentic waterbody <1m deep; moist all year.0 to -1m belowBasin
MO
MoundedMounded earthworks; including Dams; Mounds (>30m width).>2m highMound
MS
Shallow StreamGravity-flowing natural watercourse <1m deep (<30m width).above floodplain/ <1m max depthChannel
PA
Small PondLentic waterbody >1m deep (<30m width).>1m below low waterLentic
PB
Large PondLentic waterbody >1m deep (>30m width).>1m below low waterLentic
RE
ReservoirDammed waterbody >1m deep (>30m width).>1m below low waterLentic
RM
River MarginMargins of Flowing natural watercourse <1m deep. floodline to 1m below low waterSloping
RP
Retention PondExcavated retention ponds, usually with drainage systems, <1m deep; wet all year.0 to 1m below low waterBasin
RS
StreamFlowing natural watercourse >1m deep (<30m width).>1m below low waterChannel
RV
RiverFlowing natural watercourse >1m deep (>30m width).>1m below low waterChannel
SL
SlopingSloping land.>5m above floodlineHills, 0 - 30% Slope
SM
Seasonal StreamSeasonal or episodic flowing natural watercourse with flooding frequency preventing regular agricultural USE (<30m width). floodline to max channel depthChannel
SR
Seasonal RiverSeasonally or episodal flowing natural watercourse; variable depth (>30m width). floodline to max channel depthChannel
SS
Steep SlopeSteep slopes.>5m above floodline>30% Slope
SU
SummitTops of hills; plateaus.>5m above floodlinesummit, 0 -30% Slope between steep slopes
TS
Terraced SlopeTerraced slopes.>5m above floodlineAnthropogenic Terrace on >5% slope
WM
Water MarginMargins of Lentic waterbody that are <1m deep (pond; lake; reservoir). floodline to 1m below low waterSloping

Citation for AEM: Ellis E. C., H. Wang, H. Xiao, K. Peng, X. P. Liu, S. C. Li, H. Ouyang, X. Cheng, and L. Z. Yang. 2006. Measuring long-term ecological changes in densely populated landscapes using current and historical high resolution imagery. Remote Sensing of Environment 100(4):457-473.