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The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage...
Search relevance: 1.00 | Views last month: 79 | Catalog Last Checked: May 05, 2026 at 08:51 PM -
The High Resolution National Hydrography Dataset Plus (NHDPlus HR) is an integrated datset of geospatial data layers, including the most current National Hydrography Dataset (NHD),...
Search relevance: 1.00 | Views last month: 76 | Catalog Last Checked: May 05, 2026 at 08:23 PM -
A permit is required to install a retaining wall if the height of the wall measured from the bottom of the footing to the top of the wall is over 48 inches unless supporting a surcharge. A permit...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 06, 2026 at 06:56 AM -
Structures in the public right of way maintained by DPW. Source: DPW'S RSIS system.
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Structure Lines. Contract NCPC 93-02. This document describes the planimetric map production for the 350 tiles located in Washington DC and the surrounding states of MD and VA.
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The planimetric data was compiled by The Sanborn Map Company, Inc for the Metropolitan District and is based on an aerial flight performed in April 2015. In addition, the City's GIS staff has been...
Search relevance: 1.00 | Views last month: 0 | Catalog Last Checked: July 29, 2025 at 11:32 AM
