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US Census Bureau
West Virginia GIS ConferenceJune 2 – June 5, 2014Anne JeffersGeographer
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Overview
Geographic Support System Initiative (GSS-I)
Boundary and Annexation Survey
Census Geographic Products
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Geographic Support System Initiative (GSS-I)
Expanded Partnerships Lead to
Improved Data Quality
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Key Components of the GSS-IAn integrated program that utilizes a partnership program for:
Improved address coverage Annual, transaction-based address and spatial feature
updates Enhanced quality assessment and measurement
Address Updates
123 Testdata RoadAnytown, CA 94939
Lat 37 degrees, 9.6 minutes NLon 119 degrees, 45.1 minutes W
Street/Feature UpdatesQuality Measurement
The GSS-I Partnership Program Launched in October 2012 Opportunity for tribal, state, county, and local
governments to continually share address & spatial data with the Census Bureau
Recognizes local governments as a definitive authority for quality address and street data within their communities
Leverages the Census Bureau’s broad partner network to encourage participation
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Benefits of Participation1. Expanded ROI – encourages re-use of local government
geospatial data investment2. Increases usage of high-quality local government data
for multiple federal programs, ie: the 2020 Census and the USGS National Map
3. Provides maximum input into the American Community Survey.
4. closes the gap between partner addresses and Census addresses for Local Update of Census Addresses (LUCA) program in 2020.
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Targeted Canvassing in 2019?
2009 Address Canvassing
100% Canvassing
vs
2019 Targeted Canvassing
What is the Basic Process?1. Research and identify potential data partners.2. Acquire partner data and perform Content Verification to
determine general usability3. Crosswalk, standardize, match, and geocode partner
addresses and structure points using the Master Address File (MAF)
4. Match street centerline data to identify differences, calculate spatial accuracy using GPS control points
5. Ideal Scenario: new addresses are added to the MAF, new streets are added to TIGER, address and spatial inconsistencies are resolved
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Partner Data Acquisition and Content Verification
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Partner Data Acquisition
Data as of February 17, 2014
Partners Contacted
Partners Providing Files
Address List
Acquired
Structure Coordinates
Acquired
Street Centerlines
Acquired
Partner Files Processed
TOTAL 375 247 164 546 615* 778**
* Some counties provided multiple partial-coverage street centerline datasets (i.e., cities vs. balance of county)
** Includes feature and address files processed through the MAF/TIGER system update process
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GSS-I Participants to Date
GSS-I Status for West Virginia (FY14)
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Observations from Content Verification
Incomplete metadata – projection, datum, data dictionaries, etc. Coverage gaps – some counties excluded data for incorporated
cities within their legal jurisdiction Frequent call-backs for explanations and missing data – i.e.,
missing Interstate Highway layer, cryptic building use codes, etc. Failure to meet minimum Street Feature Guidelines – limits the
uses for partner-provided data (i.e., street matching, attribute harvesting, coordinate enhancement)
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WVDHSEM Dataset State-wide, consistent
Current – within the last 2 years
Complete Metadata
Meets GSS-I minimum data Guidelines
Residential vs Non-Residential
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Address Matching & Geocoding
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Minimum Address Guidelines - MATCHING To successfully match to the MAF, a partner address must include:
Complete Address Number Complete Street Name
AND at least one of the following:
Address Coordinate (latitude, longitude) ZIP Code Postal City and State Census 2010 Tabulation State, County, Tract and Block Code
This minimum information allows the Census Bureau to update the source data for an existing MAF address record, adding to our confidence that the address is valid.
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Minimum Address Guidelines - GEOCODING
In order to update the location (geocode) for an existing MAF address, the partner address must meet the MATCHING requirements above, and also provide one of the following data items:
– Address Coordinate (latitude/longitude) or – Census 2010 Tabulation State, County, Tract and Block Code
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Minimum Address Guidelines – ADDS
To ADD new partner addresses to the MAF, the partner address data must: meet the MATCH requirements above,and include an address type indicator identifying the address as residential,
commercial, utility, etc.and not already exist in the MAF
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Minimum Address Guidelines – within UNIT IDENTIFIERSFor residential addresses with multiple units (i.e., apartments, condos, etc.), the partner address data should provide: a unique Within Structure Identifier (apartment #, unit #, etc.) to distinguish each
unit from other units at the same Basic Street Address (BSA).or, if a Within Unit Identifier is not available or does not exist: The number of units at the BSA (i.e. “123 Main Street - 25 Units”)and A flag indicating which addresses are multi-unit structures
Total Partner Addresses Received (4/04/14) 33,354,160
Duplicate Addresses Identified within Partner Datasets (multi-unit addresses missing unit
identifiers)
1,647,877 5%
Total Unduplicated Partner Addresses 31,706,283 95 %
Total Partner Addresses Matched to Master Address File (MAF)
28,011,133 88% of Total
Addresses in Same Block as MAF 26,031,249 93% of Matched
Addresses in Different Block than MAF 1,589,558 6% of Matched
New Geocode Attained 370,429 1% of Matched
Addresses w/ Same Address Class as MAF (residential, etc.)
14,634,970 52% of Matched
Addresses w/ Different Address Class than MAF
567,247 2% of Matched
Addresses w/ No Address Class Identified
12,808,916 46% of Matched
Total Partner Addresses Unmatched to MAF 3,695,150 12% of Total
Unmatched Class Residential 1,120,180 30% of Unmatched
Unmatched Commercial/Other/Unspecified
2,574,970 70% of Unmatched
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Block Level Address Feedback
BlockTotal
AddressesTotal
ResidentialTotal
NonresidentialTotal Other
Total Matched
Total Added
Total Coordinates
AddedTotal Not Accepted
Total Not Accepted Duplicate
Total Not Accepted
Incomplete
Total Not Accepted
Other
Total Currently in
MAF
1000 0 0 0 0 0 0 0 0 0 0 0 11001 1 1 0 0 1 0 1 0 0 0 0 11002 4 4 0 0 4 0 3 0 0 0 0 41006 5 5 0 0 4 1 3 0 0 0 0 51008 2 2 0 0 2 0 2 0 0 0 0 51010 4 4 0 0 0 0 0 2 1 1 1 3
Consists of block tallies detailing:• What the partner provided• Number of records matched or added to the Census address list• Number of records not accepted• Total number of records currently in the MAF
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Street Centerline Evaluation and Update
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Interactive Review and Update• The Census Bureau performs an
interactive review of the potential new and misaligned streets using the partner data and current imagery
• In this example, the green-blue lines indicate street updates made by the Census Bureau based on the partner data
• The Census Bureau added 39 miles of new streets and modified 115 miles of misaligned streets based on this partner’s street centerline data
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Street Centerline Updates8,887 total miles of feature updates
Charleston, WV to Rio de Janeiro, Brazil!
Road Adds + Road Updates to MTDB
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Feature FeedbackAdding a date of last update field to the partnership shapefiles:
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Boundary and Annexation Survey (BAS)
Geographic program for legal governments to provide changes to their boundaries.
2014 - was suspended due to Budget cuts 2015 – has been Budgeted, but the funding has
not yet been determined
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Contact the BAS Team at Census
http://www.census.gov/geo/partnerships/bas.html
Email: geo.bas@census.gov
Phone: 301-763-1099
Geographic Products
TIGERWEB – WMS & REST map services
Cartographic Boundary Files
TIGER/Line Shapefiles & Geodatabases w/ Demographic Data
TIGER Geodatabases
TIGER/Line Shapefiles
KML Prototype Files
Full detail, extensive attributes, current vintages
Generalized detail, limited attributes, limited vintages
Generalized detail, limited attributes, limited vintages
Detailed, extensive attributes, current vintages
Full detail, limited attributes, current vintages
Full detail, limited attributes, limited vintages
http://www.census.gov/geo/maps-data/
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Census Geocoderwww.census.gov/geo/maps-data/data/geocoder.html
For more information, please visit:http://www.census.gov
anne.l.jeffers@census.gov
Thank you!
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