indiana 2011 – 2013 statewide local-resolution national hydrography dataset (nhd) project

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


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


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)


Data Organized into Hydrologic Units

• Hydrologic Units Codes (HUC) assigned to each


Data Organized into Hydrologic Units

• HUC & WBD Maintained by USGS with the help of StatedataStewards


Hydrologic Units – Subbasins (HUC8)


Background

Streams – the fundamental core of the NHD


BackgroundFlow Direction – giving intelligence to the

data


Background

Navigation – Creating fundamental knowledge


Background

Navigation – Where does a toxic spill go?


Background

Linear Referencing – Stream “Reaches”


Background

Linear Referencing – Stream addresses


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


Local-Resolution NHD Example

High-resolution NHD 1:24,000 Scale (1”=2,000’)Local-resolution NHD 1:2,400 Scale (1”=200’)



Production done by HUC 8 (Subbasins)

Existing 1:24,000 High-Resolution NHD



New 1:1,200 or 1:2,400 Local-Resolution NHD Developed for 6AC Sub-catchment derived from 2005 DEM



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



End Result = New 1:1,200 or 1:2,400 scaleLocal-Resolution NHD


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


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:


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


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)


Approach

• Reference Files Local Hydrography provided by the

State National Wetlands Inventory (NWI) INDNR Dams Karst Dyelines DOT Bridges 24K NHD


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



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



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


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



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



• 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


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


Questions and Answers

indiana 2011 – 2013 statewide local-resolution national hydrography dataset (nhd) project

Documents

dissemination of data

data products

adoption of standards

usgs nhd

local features

flowline streamriver

fundamental core

modeling water flow