where are the land and the water? noaa and ladotd developing the common framework to support...
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Where Are the Land and the Water?NOAA and LADOTD
Developing the Common Framework to Support Mapping, Charting, and Geospatial Data Development
James E. Mitchell, Ph.D.
IT GIS Manager&
Kurt L. JohnsonIT GIS Technical Specialist
Louisiana Department of Transportation and Development
Tim OsborneNational Oceanic and Atmospheric
AdministrationOffice of Coast Survey
for the Eastern Gulf
Why the NHD requires updating…
►High Resolution NHD was built from “best available” data……old maps and imagery
►Eliminate inconsistencies related to the lack of contemporaneous source data from the original USGS maps
►Keep pace with the rate and frequency of change in the Louisiana coastal landscape
AL
AK
TX
MS
DOTD Revised
Map Age as of March 20125 - 9 Years 39 Quads (4%)
10 - 14 Years 163 Quads (19%)
15 - 19 Years 152 Quads (17%)
20 - 24 Years 202 Quads (23%)
25 - 29 Years 136 Quads (16%)
30+ Years 187 Quads (21%)
Age of USGS 7.5-Minute Quadrangle Map Series in Louisiana
Red features are from the NHD. Orange polygons are areas represented by NOAA as land in 1940 (most current data). These areas are now open water in the NHD.
Where has all the coastline gone?
Mid & Lower Basin Delineation Chabreck – Linscombe vegetative classification for determining
saltwater species
Green – Fresh Marsh, Non-Marsh, & SwampYellow – Intermediate MarshRed – Saline Marsh
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