(3) Digital BAS Training (Jan 2012)
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The document provides an overview of the Digital Boundary and Annexation Survey (BAS) process, including the MAF/TIGER database, the Digital BAS package, and tips for making boundary updates digitally using GIS software or the MTPS tool. Key steps include creating change polygons to represent differences from Census boundaries, attributing them correctly, and submitting the digital file to the Census Bureau.
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(3) Digital BAS Training (Jan 2012)
- 1. Introduction to the Digital BAS
- 4. Topological Relationship Census Tract Edges Incorporated Place Integrated Layer School District
- 5. MAF/TIGER Database - Edges
- 6. MAF/TIGER Database – County Subdivisions
- 7. MAF/TIGER Database – School Districts
- 8. MAF/TIGER Database – Voting Districts
- 21. Example: Road through an unincorporated place In this example, the houses are in unincorporated county, while the road ROW has been annexed into an incorporated place. Without a corridor, the housing units along this road would be included in the incorporated place. Geographic Corridors
- 23. We prefer that you snap the boundary to the centerline as offsets are difficult to maintain. If offsets are not coded as such, your boundary will be snapped. Geographic Corridors and Offsets Incorporated Places A B
- 26. Data Dictionary
- 28. Digital BAS Demonstration ArcGIS & MAF/TIGER Partnership Software (MTPS)
Notas del editor
- Explain why there are two lines – moved boundary to correct location
- Username is ‘BAS’.
- Last bullet point - If you only remember 1 thing from this presentation, make it this (snap to existing census geography whenever possible)!
- Make sure you return your .prj file to us (or metadata containing your projection info if your GIS doesn’t produce a .prj file).
- Linear features: Streets, rivers, etc. Point landmarks: airports, mountain peaks Area landmarks: parks, lakes/water features, etc. Address ranges: these do not show actual addresses – merely a range of potential addresses.
- Describe what to put in each field. We also request that they provide us with the area being annexed/deannexed. It is required in Georgia.
- Bullet point#1 - This is important for some cities because they are portraying that the city is not responsible for road maintenance. This is NOT relevant for the Census Bureau tabulations and is not easy to depict in our nationwide database. This type of corridor should NOT be included in your BAS response.
- Again, without additional information, the census bureau will code the addresses to the centerline of the road. While the census bureau recognizes that most local governments do use parcels to map their boundaries, the census bureau would ultimately prefer that participants use the centerlines to map their boundaries. This ensures that the correct population counts are assigned to the correct geographies….etc etc.
- We strongly request you don’t do reshapes.