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GIS.NY.GOV

NYS ITS GIS Program Office

Geographic Information Systems Clearinghouse

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3 Data Sets
  Data Set Name Description
1. Modeled emergent wetlands
   No Login Required Data Set Details
Revised: June 2022
Niche models of where emergent wetlands should occur based on terrain variables (slope, TWI, elevation) soils, and climate modeled using maximum entropy (maxent), following procedures described by Raney and Leopold. Fantastic Wetlands and Where to Find Them: Modeling Rich Fen Distribution in New York State with Maxent. Wetlands 39, 81-93 (2018). Produces areas likely to have been wetlands prior to anthropogenic disturbance / land use change. Models tend to be conservative meaning more area is likely to exhibit hydrological characteristics than what is displayed.  
2. Modeled forested wetlands
   No Login Required Data Set Details
Revised: June 2022
Niche models of where forested wetlands should occur based on terrain variables (slope, TWI, elevation) soils, and climate modeled using maximum entropy (maxent), following procedures described by Raney and Leopold. Fantastic Wetlands and Where to Find Them: Modeling Rich Fen Distribution in New York State with Maxent. Wetlands 39, 81-93 (2018). Produces areas likely to have been wetlands prior to anthropogenic disturbance / land use change. Models tend to be conservative meaning more area is likely to exhibit hydrological characteristics than what is displayed. 
3. Topographic Wetness Index (TWI)
   Data Set Details
Revised: June 2022
The topographic wetness index, also known as the compound topographic index, is a steady state wetness index. It is commonly used to quantify topographic control on hydrological processes. The index is a function of both the slope and the upstream contributing area per unit width orthogonal to the flow direction. Resolution is 10-m, derived from statewide digital elevation model. Not a LiDAR derived product.Data are further described in Raney and Leopold (2018). Fantastic Wetlands and Where to Find Them: Modeling Rich Fen Distribution in New York State with Maxent. Wetlands 39, 81-93.