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GRANIT Metadata for Two Foot Topographic Contours - Headwaters Ashuelot River (0108020101) - smoothed

GRANIT Metadata for Two Foot Topographic Contours - Headwaters Ashuelot River (0108020101) - smoothed

Title: Two Foot Topographic Contours - Headwaters Ashuelot River (0108020101) - smoothed
Time Period of Content: 05/06/2011 - 05/24/2018 Initial Publication Date: 10/01/2019
Originator: GRANIT, Earth Systems Research Center, University of New Hampshire
Abstract:
This data set represents smoothed, 2-foot bare earth contours (isolines) for the Headwaters Ashuelot River (0108020101) HUC 10 unit. It was derived from a data set which was compiled from LIDAR collections in NH available as of spring, 2019. The raster was filtered using the ArcGIS FOCAL STATISTICS tool with a 3x3 circular neighborhood. The contours were generated using the ArcGIS CONTOUR tool while applying a Z factor of 3.2808 to convert the elevation values from meters to feet. The filtered contours were then smoothed using the ArcGIS SMOOTH LINE tool. The data include an INDEX field with values of 10 and 100 to flag 10 and 100-foot contours. Note on HUC 01060000310: Due to limitations in the source LIDAR data, some anomalies exist in the generated contours in coastal areas of the state. These were left in the data so that users can determine what further processing best meets their application needs.
Theme Keywords: elevation, contours, hypsography, LiDAR, Headwaters Ashuelot River
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