Provides bathymetric depth contours in feet for New Hampshire lakes surveyed by the New Hampshire Department of
Environmental Services since 2000 and New Hampshire Fish and Game.
This dataset was created to calculate lake volume for lake trophic classification and to provide lake
stakeholders with a bathymetric map. USE THIS DATA AT YOUR OWN RISK
Supplemental_Information: Data distribution tile: statewide
Currentness_Reference: The extents of the dataset.
Theme_Keyword: depth contour
Theme_Keyword: New Hampshire
The dataset provides a rough estimate of a lake's depth contours and SHOULD NOT be used for navigational purposes.
Reference NHDES as the source of the data is required in any published use of the data. User is required to read metadata
completely before using the data. The information provided in this coverage is a subset of spatial databases developed
by the New Hampshire Department of Environmental Services (NHDES). Development of these databases is an ongoing
project; they may not contain all existing and potential sites, stations, or threats. NHDES is not responsible for the
use or interpretation of this information, or for any inaccuracies in the site names, tax map and lot information,
or locations. All information is subject to verification. These data are to be used for planning purposes only; distribution
Contact_Organization: New Hampshire Department of Environmental Services
New Hampshire Department of Environmental Services
New Hampshire Fish and Game
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2.3552
NHDES is not responsible for the accuracy, use or interpretation of this information. Not intended for legal purposes. The data provides a rough estimate of a lake's depth contours and SHOULD NOT be used for navigational purposes.
The points were plotted over USGS topographic quads and reviewed for positional accuracy as well as thoroughness of coverage for the water body being mapped.
The data was gathered using a GARMIN GPSMAP 168 sounder using North American Datum (NAD) State Plane 83. Waypoints collected were downloaded using Garmin MapSource software and converted to text. The points were imported and projected to NAD State Plane using ArcGIS. Using Spatial Analyst and 3-D Analyst in ArcGIS, the points were converted to a TIN. The TIN was used to create a raster that was used to create contours for each lake.
Data submitted by New Hampshire Fish and Game was assigned the appropriate AUIDs and incorporated into the rest of the bathymetry. Data that overlapped with existing bathymetry was not used.
Map_Projection_Name: NAD 1983 StatePlane New Hampshire FIPS 2800 Feet