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?

NHD land/water interface

RedfishBay

Southeast Pass

Pass a Loutre WMA

08090301 Pre-Revision East Central Louisiana Coastal

Upper Basin DelineationIntercoastal Waterway – HUC 12 and Physical

Barrier

Mid & Lower Basin Delineation Chabreck – Linscombe vegetative classification for determining

saltwater species

Green – Fresh Marsh, Non-Marsh, & SwampYellow – Intermediate MarshRed – Saline Marsh

08090301 Post-Revision

MSAL

TX

AR

FL

NHD Status as of March 2012Unrevised - Low Priority

Unrevised - High Priority

NHD Revision Complete

NHD Revision In-Progress

State of Louisiana Watershed Revision Status