Law Enforcement Structures

This feature layer, utilizing National Geospatial Data Asset (NGDA) data from the U.S. Geological Survey (USGS), displays police and prison landmarks in the U.S. Per the USGS, "Structures data are designed to be used in general mapping and in the analysis of structure related activities using geographic information system technology. The National Map structures data is commonly combined with other data themes, such as boundaries, elevation, hydrography, and transportation, to produce general reference base maps. The types of structures collected are largely determined by the needs of disaster planning and emergency response, and homeland security organizations."

Law Enforcement Structures

This feature layer, utilizing National Geospatial Data Asset (NGDA) data from the U.S. Geological Survey (USGS), displays police and prison landmarks in the U.S. Per the USGS, "Structures data are designed to be used in general mapping and in the analysis of structure related activities using geographic information system technology. The National Map structures data is commonly combined with other data themes, such as boundaries, elevation, hydrography, and transportation, to produce general reference base maps. The types of structures collected are largely determined by the needs of disaster planning and emergency response, and homeland security organizations."

Law Enforcement Structures

This feature layer, utilizing National Geospatial Data Asset (NGDA) data from the U.S. Geological Survey (USGS), displays police and prison landmarks in the U.S. Per the USGS, "Structures data are designed to be used in general mapping and in the analysis of structure related activities using geographic information system technology. The National Map structures data is commonly combined with other data themes, such as boundaries, elevation, hydrography, and transportation, to produce general reference base maps. The types of structures collected are largely determined by the needs of disaster planning and emergency response, and homeland security organizations."

This image layer, utilizing National Geospatial Data Asset (NGDA) data from the U.S. Forest Service (USFS), displays the fire regime groups from the Landfire project. Per USFS, "The Fire Regime Groups characterize the
presumed historical fire regimes within landscapes based on interactions
between vegetation dynamics, fire spread, fire effects, and spatial
context."

Fire Regime Groups are defined as:

• I: 0 to 35 year frequency, low to mixed severity 
• II: 0 to 35 year frequency, replacement severity 
• III: 35 to 200 year frequency, low to mixed severity 
• IV: 35 to 200 year frequency, replacement severity 
• V: 200+ year frequency, any severity 
• Indeterminate Regime: No defined fire behavior or extremely low probability of ignition

Data currency: Current federal service

Changes to available layers may occur overtime. Generally, datasets are updated quarterly but see individual layer descriptions for more details. 

National Wildlife Refuges

This U.S. Fish and Wildlife Service (FWS) feature layer depicts National Wildlife Refuges. These Refuges display external boundary of lands and waters administered by FWS. According to FWS, "Each unit of the Refuge System — whether it is a wildlife refuge, a marine national monument, a conservation area or a waterfowl production area — is established to serve a statutory purpose that targets the conservation of native species dependent on its lands and water. All activities on those acres are reviewed for compatibility with this statutory purpose."