indiana 2011 – 2013 statewide local-resolution national hydrography dataset (nhd) project mini –...
TRANSCRIPT
Indiana 2011 – 2013Statewide Local-Resolution
National Hydrography Dataset (NHD) Project
MINI – WORKSHOPThanks to…
Susan Phelps, AECOM ; Jeff Simley, U.S. Geological Survey,
& the IGIC Waters Workgroup
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Topics• Project
Background
• Approach
• Project Tasks Conversion Conflation
• Status / Next Steps
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
What is the USGS National Hydrography Dataset (NHD)?
• Feature-based database of nation’s surface water drainage system maintained by the USGS
• Network of streams, rivers, and other flowlines; lakes, ponds, and other waterbodies
• Suitable for modeling water flow & geocoding local features and events
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
What is the USGS NHD?• Flowline (Stream/River, Canal/Ditch, Artificial Path)• Waterbody (Lake/Pond, Swamp/Marsh, Reservior)• Areas (Large Stream/River, Large Canal/Ditch)• Points (Gaging Station, Well)• Lines (Dams)
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Data Organized into Hydrologic Units
• Hydrologic Units Codes (HUC) assigned to each
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Data Organized into Hydrologic Units
• HUC & WBD Maintained by USGS with the help of StatedataStewards
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Hydrologic Units – Subbasins (HUC8)
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Hydrologic Units – Subbasins (HUC8)
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Background
Streams – the fundamental core of the NHD
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
BackgroundFlow Direction – giving intelligence to the
data
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Background
Navigation – Creating fundamental knowledge
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Background
Navigation – Where does a toxic spill go?
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Background
Linear Referencing – Stream “Reaches”
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Background
Linear Referencing – Stream addresses
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Improving the NHD for Indiana
Current:• Features in current NHD based upon 1:24,000
USGS Topographic Quad Maps• Most users require data at better scale• Features have changed since Maps were created
Update NHD using 2005 Ortho & DEM products:• Updates of physical features (existence, location)• New (Local-res) Data would be at scale of 1:2,400
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Local-Resolution NHD Example
High-resolution NHD 1:24,000 Scale (1”=2,000’)Local-resolution NHD 1:2,400 Scale (1”=200’)
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Local-Resolution NHD Example
Production done by HUC 8 (Subbasins)
Existing 1:24,000 High-Resolution NHD
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Local-Resolution NHD Example
New 1:1,200 or 1:2,400 Local-Resolution NHD Developed for 6AC Sub-catchment derived from 2005 DEM
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Local-Resolution NHD Example
New 1:1,200 or 1:2,400 Local-Resolution NHD Developed for 6AC Sub-catchment derived from 2005 DEM and matched to 2005 orthophotography
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Local-Resolution NHD Example
End Result = New 1:1,200 or 1:2,400 scaleLocal-Resolution NHD
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Approach
Small watershed in Hamilton County(Morse Reservoir and agricultural land)
Broad representation of the waterfeatures to be included in the statewideproject
Designed to provide a basis for streamlocation accuracy and upstreamdrainage area limit assessments
Results = Impressive Results andBaseline budget established (15% more local-resolution hydro captured than what County GIS maintained)
Pilot study conducted in Summer 2009
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Approach
AECOM Selected for Contractwith the State in 2010
Local subcontractors will assistwith hydrography development(Cripe & Pinnacle)
Upper Eel will be first sub-basin completed Linework will undergo QC and approval by IGIC
Waters workgroup prior to conflation Attribute conflation will undergo QC and approval
by IGIC Waters workgroup and USGS before work begins on additional sub-basins
37 additional sub-basins in state (28 funded by OCRA, 8 remaining – future GLI or other funding)
Statewide project completed by HUC-8 watershed sub-basin in phases:
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Approach
• Creation of local-resolution hydrography 5 feature types collected
Flowline (Stream/River, Canal/Ditch, Artificial Path)
Waterbody (Lake/Pond, Swamp/Marsh, Reservior)
Area (Large Stream/River, Large Canal/Ditch)
Point (Gaging Station, Well) – pass through from high-resolution
Line (Dams) - pass through from high-resolution
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Approach
• Base Data Imagery
2005 one foot and/or half foot pixel RGB orthophotography
Terrain (Contours, DEMs, Hillshades) 2005 five foot post-spacing DEM (ISTAR)
Supplemented by newer and/or more accurate local data where available (e.g. 2011 -2013 Ortho/LiDAR)
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Approach
• Reference Files Local Hydrography provided by the
State National Wetlands Inventory (NWI) INDNR Dams Karst Dyelines DOT Bridges 24K NHD
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Project Tasks - Conversion
1. Hydro-correct elevation data Generate 6 acre basins and streams
for reference (guidance for upstream limits and stream location)
Generate contours, DEMs, hillshades for reference
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Project Tasks - Conversion
2. Digitize NHD features Create 1:2,400 or 1:1,200 scale hydrography
layer (dependent upon imagery source) to the 6 acre upstream drainage limit
Imagery will be primary source for data conversion, terrain data used where features are not visible
1:24K NHD used as referenceto ensure all features havebeen incorporated
Hydrography edge-matched to1:24K NHD along state borders
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Project Tasks - Conversion
3. Prep data for conflation• The NHDinGeo version 2.0
database schema will be used• Combination of USGS scripts,
and ArcGIS 9.3 tools to check: Topology Flow direction FCode population Artificial paths Connectors
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Project Tasks - Conflation
USGS NHD GeoConflation Toolset
Reach codes, GNIS info conflated from 1:24K NHD, and generated for new features using the USGS NHD tools
Intermittent/Perennial designations conflated for1:24K attributes only
4. Conflation of1:24K NHD attributes and data population for new features
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Project Tasks - Conflation
Most performed through NHD GeoConflation queues at various stages After permanent reach codes
assigned, checks for gapped or branched reach codes
Checks for gapped or branched GNIS names
Subsequent processing steps cannot proceed until potential problems have been resolved
5. Quality Control of conflation
* Close coordination with and approval by State & USGS
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Project Tasks - Conflation
• Waters Workgroup will check out 1:24K NHD sub-basins as conflation occurs to avoid any other edits being made to the sub-basin
• Feature level, FGDC compliant metadata generated for each sub-basin
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Status / Next Steps
• Status Completed conflation training with USGS Base data received for Upper Eel pilot
area
• Next Steps Complete conversion and conflation tasks
for Upper Eel pilot area 3 iterations of QC performed by Indiana’s QC
team Prioritize work, outline schedule for
remaining sub-basins