Transcript FedorkoStrager_NHDMeetingAtWVDEP_FINAL_05282009.ppt

The NHD and the Future of
Stream Mapping in West Virginia
Evan Fedorko
West Virginia GIS Technical Center
www.wvgis.wvu.edu
Jackie Strager (NRAC)
www.nrac.wvu.edu
Kevin Kuhn
Kurt Donaldson
WVGISTC
Introduction
• Outline:
– History of NHD Development in West Virginia
• Overview of NHD status in WV
• Local Resolution NHD Pilot Projects
– Existing stream map: 24K NHD
• Known issues
• Need for upgrades/stewardship
– What’s next: Stewardship and the future of NHD
• Challenges
• Recommendations
• Introduction
• Current NHD
• Stewardship
NHD Status in WV
• National Hydrography Dataset (NHD)
• NHD is complete in WV for:
– Medium resolution (1:100,000 scale)
– High resolution (1:24,000)
• Local resolution NHD (1:4,800)
– Pilot projects complete
– Gauley
– Upper Guyandotte
• Introduction
• Current NHD
• Stewardship
Local resolution NHD
• Introduction
• Current NHD
• Stewardship
• Local streams mapped from 2003 SAMB aerial
photography and 3m DEM
• Benefits:
– Better cartographic base for local mapping
– Captures changes in stream geometry, length
• Status:
– Pilot projects complete for Gauley, Upper Guyandotte
watersheds in late 2008
– Not currently downloadable from USGS
LR-NHD Conclusions
• Introduction
• Current NHD
• Stewardship
• Two pilot watersheds completed
• WV one of the first states to complete conflation
using USGS’ new conflation tools
• At this time, continued development of LR-NHD
is not recommended. Reasons:
– Issues with 1:4,800 source data – inconsistent inclusion of
“special features” such as ditches and culverts
– Comparative difficulty of conflation process
– Propagation of HR-NHD errors
– General lack of interest by the WV NHD community
– The persistent generalization question
– Continued changes in stream geometry
Evaluating the NHD
• Introduction
• Current NHD
• Stewardship
• At this time, most complete statewide stream
dataset is the 24K NHD (HR-NHD)
• What can be improved in 24K NHD in WV?
• Evaluation of the 24K NHD
– Statewide review by WVDEP
– Documentation of errors by NRAC, WVDEP
– Case study of mining-related changes (Coal River)
Issues with 24K NHD
• Introduction
• Current NHD
• Stewardship
• Main issues:
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–
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Errors in geometry
Errors in attributes
Errors in NHD formatting, reach coding
Changes in stream geometry since streams were
mapped
• Source data for 24K NHD:
– 24K DLG data
– Topo map blue lines
– GNIS names
Issues with NHD: Source data
NHD Source data:
USGS Topo maps
• Introduction
• Current NHD
• Stewardship
Issues with NHD
Quantifying issues
with the NHD
Primarily based on
WVDEP review
• Introduction
• Current NHD
• Stewardship
Issues with NHD
Quantifying issues
with the NHD
Primarily based on
WVDEP review
• Introduction
• Current NHD
• Stewardship
• Introduction
• Current NHD
• Stewardship
Quantifying issues
• Quantifying 24K NHD issues as identified by
WVDEP review
Type of problem
Possible geometry error
NHD attribute error (FCODE)
Karst/sinking streams
NHD format error (reaches)
Name issues (possible)
Name issues
TOTAL
Number of
Segments
% of
Segments
Total Length
(mi)
614
0.28
254
6
0.00
3
291
0.13
107
6
0.00
n/a
204
0.09
89
1,337
0.62
657
216,579
94,796
Geometry issues in NHD
• Stream updates needed due to:
• Construction of dams, impoundments
• Roads, highways
• Ongoing mining-related alterations
• Introduction
• Current NHD
• Stewardship
Coal River case study
• Goal: Quantify amount of stream drainage
change related to mining for southern WV
watershed
• Input datasets:
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–
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24K NHD stream lines
1:4,800 local stream lines
2003 SAMB aerial photos
2007 NAIP aerial photos
• Introduction
• Current NHD
• Stewardship
Original 24K NHD
• Introduction
• Current NHD
• Stewardship
• Introduction
• Current NHD
• Stewardship
2003 Aerial photos
2003
Photo
• Introduction
• Current NHD
• Stewardship
Mining visible in 2003
2003
Photo
• Introduction
• Current NHD
• Stewardship
Aerial photos 2007
2007
Photo
• Introduction
• Current NHD
• Stewardship
Mining visible 2007
2007
Photo
Summary for 24K NHD in Coal
Description
Entire Coal watershed
Impacted by mining (2003)
Impacted by newer mining
(2007)
Area
(acres)
Length of
24K streams
(mi)
570,000
2,232
12,321
10,757
59
33
Total: 4.1% of stream length
NOTE: Similar analysis shows that 1.3% of mapped
local scale streams were impacted by mining
between 2003 and 2007.
Future of NHD for WV
• Introduction
• Current NHD
• Stewardship
• Goal: Establish a stewardship program for NHD
in WV, including:
– Ensure data updates and maintenance (immediate &
long-term)
– Develop procedures & policies
– Establish central point of contact
– Identify principal steward, sub-stewards
• Steps taken so far:
– Drafted a business plan for NHD in WV
– Drafted an MOU between potential NHD steward and
the USGS
Business Plan
• Introduction
• Current NHD
• Stewardship
• Completed business plan for NHD in WV
• Business plan includes:
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History of the NHD
Local Resolution Development
Current uses/users of NHD in WV
A plan for NHD stewardship in WV
A draft memorandum of understanding between the
USGS and a stewardship entity
Recommendations (1)
• Introduction
• Current NHD
• Stewardship
• Identify the principal NHD steward for West
Virginia
– Candidates include: WVDEP Water, WVDEP TAGIS,
WV GIS Technical Center, Natural Resource Analysis
Center
• Responsibilities of the principal steward:
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Sign MOU with USGS
Leads and coordinates stewardship efforts
Acts as the principal authority on stewardship issues
May or may not be editor of NHD data with USGS
Geo Edit tools
Recommendations (2)
• Introduction
• Current NHD
• Stewardship
• Identify a core group of sub-stewards
– Candidates: West Virginia GIS Technical Center,
Natural Resource Analysis Center, WV Department of
Natural Resources, USFS – Mon National Forest, et
al.
• Responsibilities of sub-stewards:
– Trained to use USGS NHD Geo Edit tools
– Participate in editing of NHD data
– Fill in knowledge gaps
Recommendations (3)
• Work as a group with the NSDI and NHD
liaisons to secure start up funding for NHD
Stewardship
• We believe funding equivalent to 1 FTE
employee will be necessary to get an NHD
stewardship program off the ground
• Introduction
• Current NHD
• Stewardship
Recommendations (4)
• Introduction
• Current NHD
• Stewardship
• Develop a coordination framework for editing the
NHD; emphasize:
– Organized editing
– Information sharing
• Schedule an onsite NHD Geo Edit training
session
– PS and sub-stewards will participate
Recommendations (5)
• Introduction
• Current NHD
• Stewardship
• Convene a hydrographic data users group
• Some suggested tasks and topics:
– Develop a “best practices” document for NHD use
within groups or agencies
– Explore, document and promote NHD tools and
software such as the Hydro Event Management Tool
(HEM)
– Identify and discuss NHD stewardship policy issues
Recommendations (6)
• Introduction
• Current NHD
• Stewardship
• Continue and expand the compilation of known
errors to the NHD
• Develop a methodology to receive potential edits
from stewardship community, such as a web
editing or web based problem reporting tool.
– Several states have deployed or are developing
similar tools; Vermont, Alabama, Texas, et al.
Discussion
Natural Resource Analysis Center
West Virginia University
www.nrac.wvu.edu
WV GIS Technical Center
West Virginia University
wvgis.wvu.edu