Impervious Surface 2019

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Impervious Surface 2023

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Impervious Surface 2017

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Impervious Surface 2010

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Impervious Surface 2013

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Impervious Surface 2015

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Impervious Surfaces

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Georeferenced raster image dataset representing City of Somerville, Massachusetts, impervious surface areas.

Impervious Surfaces

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This is one of the planimetric coverages developed as part of the aerial survey project of 1996 and updated using new aerial photography collected between 25 March 2004 and 23 April 2004.

Percent impervious surface for selected Chesapeake Bay watersheds

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This dataset contains watershed means of estimated percent impervious surfaces for three time periods: 1992, 2002, and 2012. Estimates are based on coefficients derived from comparing land use of the 2012 NAWQA Wall-to-wall Anthropogenic Land-use Trends (NWALT) product to the 2011 National Land Cover Database (NLCD) imperviousness, then applying those coefficients to previous years (1974-2002) of the NWALT dataset.

Percent impervious surface for selected Chesapeake Bay watersheds

공공데이터포털

This dataset contains watershed means of estimated percent impervious surfaces for three time periods: 1992, 2002, and 2012. Estimates are based on coefficients derived from comparing land use of the 2012 NAWQA Wall-to-wall Anthropogenic Land-use Trends (NWALT) product to the 2011 National Land Cover Database (NLCD) imperviousness, then applying those coefficients to previous years (1974-2002) of the NWALT dataset.