US Census Bureau

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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: [email protected]

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

[email protected]

Thank you!

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