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Map Information

Selected Maps

Hydrography: The Hydrography map shows the water features of the Eagleville Brook Watershed over a faint hillshaded relief map. The relief map is helpful as it shows, generally, the way water will flow. The Hydrography map includes the following layers: Eagleville Brook Basins, Hydro streams and lakes, Wetlands, Hillshade.

Imagery: The Imagery map contains two sets of imagery. The top image is a high resolution, color image captured in April 2008. It shows a great deal about the land inside the basin including which areas are forested, field, building and athletic fields. Because the high resolution, color image on the top does not cover the entire basin, a high resolution black and white image, captured in 2004, is shown on the bottom. The Imagery map includes the following layers: Eagleville Brook Basins, Hydro streams and lakes, April 2008 high resolution color image of UConn, Spring 2004 black and white orthophoto.

Impervious Cover: The Impervious Cover map shows all impervious areas in the watershed. Impervious means that water runs off, as opposed to infiltrating into the group. The Impervious Cover map includes the following layers: Eagleville Brook Basins, Hydro streams and lakes, and impervious cover.

Land Cover: The Land Cover map shows all land cover of the watershed. Land cover is defined by what is on the ground at any given location. Land cover is different from land use, which is what is practiced or permitted on the ground at a given location. For example an area could be classified as "developed" on a land cover map and classified as "residential" on a land use map. The Land Cover map includes the following layers: Eagleville Brook Basins, Hydro streams and lakes, and land cover. The developed class on the land cover is the sum of all the classes in the impervious cover data layer.

Parcels and Zoning: The Parcels and Zoning Map shows only the zones from the Town of Mansfield Zoning that occur inside the map area. The Parcels and Zoning map includes the following layers: Eagleville Brook Basins, Hydro streams and lakes, Mansfield parcels and Mansfield zoning.

Topography: The contours on the Topography map shows the elevation of the basin and surrounding areas, and give a field for slope and aspect too. They 50ft contour lines are labeled with elevation in feet, and the 10ft contour lines are a slightly darker color than the 5ft contour lines. The Topography map includes the following layers: Eagleville Brook Basins, Hydro streams and lakes, and 50ft, 10ft and 5ft contour lines.

 

Data Layer Information

Eagleville Brook Basins: The basins originated from the CT DEP basins layer and included basins 3100-19-1, 3100-19-1-L1, and 3100-19-2-R1. Of all the DEP basin layers available, the "basin" layer contains the smallest units. The DEP provides several drainage basin layers that next together, with the major basins being the largest, then regional basins, sub-regional basins, local basins, and finally basins. The basins for Eagleville Brook were modified by TMDL team as more detailed information about drainage became available. Click here to download the original CT DEP basins shapefile or view the metadata. Email the TMDL team at CLEAR for the modified Eagleville Brook Basin shapefile.

Hydrography (lines and polygons): The Hydrography lines and polygons and from the Connecticut DEP GIS data, 2005 Edition. The hydrography data was derived from topographic quad maps. Click on the following for Hydro line or polygon shapefile or geodatabase, hydro line metadata, hydro polygon metadata.

Wetlands: The Wetlands come form the Connecticut DEP. They are part of the NRCS soils data. Download the soils data from the CT DEP or view the soils metadata.

Land Cover: The Land Cover was digitized by CLEAR staff from (1) high resolution imagery of campus taken in the spring of 2008, and (2) NAIP (National Agriculture Imagery Program) imagery taken in the summer of 2008. NAIP imagery has a pixel resolution of 1 meter. It was later refined by CLEAR (August 2010) to be part of a wall-to-wall classification with the impervious cover data. A wall-to-wall classification means there are no geographic gaps or overlaps between the land cover and impervious cover classes.

Land cover categories include: agriculture, barren soil, forest, grass (unmanaged), turf, water, and wetland.

Impervious Cover: The Impervious Cover was digitized by CLEAR staff from (1) high resolution imagery of campus taken in the spring of 2008, and (2) Spring 2004 black and white orthophoto. It was later refined by CLEAR (August 2010) to be part of a wall-to-wall classification with the land cover data. A wall-to-wall classification means there are no geographic gaps or overlaps between the land cover and impervious cover classes.

Impervious categories include: buildings, driveways, parking lots, roads, sidewalks, other impervious features (i.e. tennis courts). Building footprints from 2004 were provided by the University of Connecticut (UConn) Architectural and Engineering Services (AES) and updated with 2008 aerial imagery.

Contours: The Contours were derived from a Digital Elevation Model (DEM), explained below.

Mansfield Parcels: The Mansfield parcels were provided by the University of Connecticut (UConn) Architectural and Engineering Services (AES). Email the TMDL team at CLEAR for more information.

Mansfield Zoning: The Mansfield Zoning is from 2008 and was provided by the Windham Region Council of Governments. Email the TMDL team at CLEAR for more information.

Imagery - April 2008 of UConn: This high resolution, true color image (0.5 ft pixel size) of the campus area was taken in April of 2008. It was provided by University of Connecticut (UConn) Architectural and Engineering Services (AES) and can be viewed and downloaded on their website.

Imagery - Spring 2004 Black and White: This 2004 orthophotography is a statewide dataset that was paid for by the state of Connecticut. Although it is not in color, it has very high pixel resolution at 0.8 ft. View the metadata for more information.

Digital Elevation Model and Hillshade: The Digital Elevation Model (DEM) for the campus area was created by CLEAR staff from 2 foot contours (2004) provided by University of Connecticut (UConn) Architectural and Engineering Services (AES). Interpolation was done by converting contours to a Triangular Irregular Network. The TIN was then converted to a raster.

For the remainder of the study area, a DEM based on the CT Lidar data (20 foot postings) was used. This DEM was downloaded from CLEAR and was generated using kriging as the interpolation method. The high quality DEM for campus was imbedded in the Lidar DEM. Contours and hillshade were derived from this final DEM.