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Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process Prepared for ESRI User Conference 2003 Prepared by Bernard Catalinotto Geo-Information Services, JV Alexandria, VA July 10, 2003

Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

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Prepared for ESRI User Conference 2003 Prepared by Bernard Catalinotto Geo-Information Services, JV Alexandria, VA July 10, 2003. Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process. Conflation Tools in TIGER Correction Process Overview. Background - PowerPoint PPT Presentation

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Page 1: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

Use of Conflation Softwarein US Census Bureau's TIGER

Coordinate Correction Process

Prepared for ESRI User Conference 2003

Prepared by Bernard CatalinottoGeo-Information Services, JV

Alexandria, VA

July 10, 2003

Page 2: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

Conflation Tools in TIGER Correction Process

Overview

Background What is Conflation?

What is MapMerger?

Standard Approach Creative Approach Results & Next Steps

Page 3: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

Initial and Major Programs

TIGER Coordinate Correction

Initial Programs Census R&D – 77 Counties Geo-Serv Contract – 190 Counties

Major Program MTAIP/Harris Corp – 3000+ Counties

Page 4: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

Task 4/Geo-Serv Project

Coordinate Correction Process

1. Data Preparation (Local File)

2. Coordinate Correction3. Geo-Serv QC & Final Fix4. Census QC5. Upload into TIGER DB

Page 5: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

Task 4/Geo-Serv Contract

Coordinate Correction Tasks

Step 1 Conflate TIGER to Local file Match all matchable features

Step 2 Find and Fix Flag issues, resolve, fix, flag action

Step 3 Prepare Deliverables Re-format Prepare QC Reports

Run QC programs Perform 100% Visual Check

Page 6: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

What is Conflation? Combine 2+ files -- create RESULTS file

includes best aspects of each file

RESULTS file Source file attributes…..”Brains from TIGER” Target file graphics…….”Beauty from Local” Differences are resolved

Rubber-sheet unmatched source features (“Orphans”)

Page 7: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

What is MapMerger?ArcMap extension for automated conflation

Automatic Match 70% to 95% of the features automatically

one-to-one matched

Match editing tools for manually editing the results of

automatic matching

Creates conflated data set

Page 8: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

Conflation using MapMerger

1. Node match2. Line match3. Transfer attributes Creates conflated data set

Page 9: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

Conflation - Vendor 1 (EarthData)

Standard Approach

Node match Match by layer 45 meters; visual check; fix errors 60 meters; visual check; fix errors

Line match Match; visual check; fix errors

MapMerger Goal 80-90% of all possible matches

Page 10: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

MapMerger -- NODE MATCH – Automatic Results

Page 11: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

MapMerger – LINE MATCH -- Automatic Results

Page 12: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

MapMerger

Manually Edit Line Match Results

Page 13: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

Conflation in MapMerger - Vendor 2 (Pixxures)

Creative Approach[Note: Skip Node match]

1. Start with Auto Line match 1 meters; check no errors 2 meters; check no errors Stop when encounter errors -- usually around 7

meters

2. Manual Line match3. QC/fix in MapMerger

Run Census/Geo-Serv/Custom QC programs Fix errors, rerun conflation in MapMerger

After MapMerger Minor QC/fix; prepare deliverables

Page 14: Use of Conflation Software in US Census Bureau's TIGER Coordinate Correction Process

Results & Next Steps

Results Efficient use of conflation software & ESRI

GIS technologies

Next Steps All three vendors making substantial

contributions to program success Goal: Complete 190 counties by 9/30/03