The Impervious Cover product is a high-resolution (1 meter) dataset that provides a map of all builtup surfaces in multiple formats to support different stormwater management and ecological applications. The Impervious Cover data layer is derived from 1 meter or better resolution, 4 band color infrared imagery that is acquired typically on a 2 year cycle as part of the National Agriculture Imagery Program (NAIP) or a state orthoimagery acquisition project. This product is an extract from the Land Cover product and provides a cost-effective solution where impermeable cover is the primary class of interest for your application.
EarthDefine's Impervious Cover product offers significant advantages over coarser resolution impervious layers that are available for large areas like the 30m National Land Cover Data Percent Impervious layer. This is because in areas of fine-scale spatial heterogeneity, the higher source resolution (1 meter) imagery enables the capture of smaller ground features and more accurate mapping of impervious surfaces.
EarthDefine's Impervious Cover layer compared to low resolution percent impervious estimates
||30m National Land Cover Dataset (NLCD) 2006 Percent Impervious
||1m Impervious Cover
What can you do with Impervious Cover data?
The Impervious Cover product helps federal, state, local and private entities by supplying accurate and spatially explicit high-resolution impervious cover data that helps them perform a wide range of mapping and analytical functions. Numerous studies show positive correlations between the amount of impervious cover and a decline in ecosystem function, so impervious cover serves as an important surrogate to measure a range of ecological properties. Example applications include:
- calculating of stormwater runoff volume and modeling of water quality and quantity through models like TR-20, TR-55, Storm Water Management Model (WSMM), Source Loading and Management Model (SLAMM), etc.
- analyzing urban heat islands and urban growth
- improving mapping of urban and rural populations through dasymetric mapping
- assessing non-point source pollution and downstream water quality
- assessing stream bank stability and streambed sedimentation
- understanding relationships between connected/total impervious and biotic integrity
- modeling impacts on aquatic biota habitat quality
|Minimum Mapping Unit||0.005 acre|