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Description: Network "nme" Flow line initiation below 0.004 square km flow accumulation, based on a 141cm resample of the topo-bathy surface. The more detailed east Marin County extent featured intensive hydrologic enforcement that had been derived from the storm drain systems of about a dozen municipal or county agencies. The analysis grid was resampled near 141cm gridding for precise 2-square-meter grid cells. Flow line initiation below 0.004 square km flow accumulation, nominally 1-acre catchment, was used to detect likely ephemeral flow over highly impermeable urban surfaces common in this area. In many cases, hydrologic enforcement had detailed curb gutters on both sides of the street at better than 1:1000 map scale. This much detail led to stability problems for the 32-bit Esri ArcGIS 10.3 for Desktop application over which ArcHydro was running, and so the east county area was produced in two parts. This "nme" network was named to imply "north Marin east".
Copyright Text: County of Marin CDA, MarinMap consortium
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Description: Both of these layers where updated, starting in December 2015. Both were based off original layers provided by MCSO. Working with GeoComm, the Marin County Sheriffs Office (MCSO) provided updated ESZ boundary information.Updated information included new and updated ESZ geometry updates, as well as, updating the new ESZ_NUM field to be used in the new Intergraph CAD mapping system.Labelling should be off both of the ESZ_NUM
Copyright Text: Geo-Comm Inc, local fire departments
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Description: Both of these layers where updated, starting in December 2015. Both were based off original layers provided by MCSO. Working with GeoComm, the Marin County Sheriffs Office (MCSO) provided updated ESZ boundary information.Updated information included new and updated ESZ geometry updates, as well as, updating the new ESZ_NUM field to be used in the new Intergraph CAD mapping system.Labelling should be off both of the ESZ_NUM
Copyright Text: Geo-Comm Inc, County of Marin Sheriff, local police departments
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Description: 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 system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.
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