Jan 03, 2016
3-year Product3-year Product
June 2009June 2009
‘‘05-’06-’0705-’06-’07
20,000 people Zones20,000 people Zones
2000 Geography2000 Geography
Actual FlowsActual Flows
5-year Product5-year Product
June 2011June 2011
’’05-’06-’07-’08-’0905-’06-’07-’08-’09
Small AreasSmall Areas
New TAZsNew TAZs
Synthetic FlowsSynthetic Flows
Will there will be TAZs?Will there will be TAZs?
BaseBase
TAZTAZ
Traditional Traditional SizeSize
MediumMedium
TAZTAZ
4,000 4,000 populationpopulation
LargeLarge
TAZTAZ
20,000 20,000 populationpopulation
• Developed in late 2008 and Developed in late 2008 and early 2009early 2009
•All zones would nest within All zones would nest within each other and Countieseach other and Counties
•GIS approach to GIS approach to developmentdevelopment
•Funded under Consolidated Funded under Consolidated PurchasePurchase
Make sure to include staff time in Work ProgramMake sure to include staff time in Work Program
Comments Comments July 5, 2007July 5, 2007
For 2000 BG Minimum was 300 to 600 peopleFor 2000 BG Minimum was 300 to 600 peopleFor Tracts the Minimum was 1,500 peopleFor Tracts the Minimum was 1,500 people
Federal Register NoticeFederal Register Noticewww.census.gov/geo/www/psap2010/psapcriteria.htmlwww.census.gov/geo/www/psap2010/psapcriteria.html
TAZS
Discussions with CB for including TAZs in PSAP software-contracts in place
Research on Disclosure Completed--Final Decisions on TAZ sizes
PSAP--TAZ Info to States and MPOS--TAZs developed by States and MPOs
Verify and Review by CB
NOYES
Will the NEW Block Group criteria be Will the NEW Block Group criteria be applied to TAZs?applied to TAZs?
Should it apply?Should it apply?
Population and Worker Size Population and Worker Size Distribution of 2000 TAZs Distribution of 2000 TAZs
Average Population Per TAZ For Each Virginia Model Region
2,337
1,446
969
293
960
479416
535
361 352
0
400
800
1,200
1,600
2,000
2,400
2,800
North
ern
Virgin
ia
Hampt
on R
oads
Richm
ond T
ri Citie
s
Frede
ricks
burg
Roanok
e Val
ley
Lync
hburg
Charlo
ttesv
ille
Win
ches
ter
Black
sburg
Harris
onbu
rg
Model Region
Po
pu
lati
on
/ T
AZ
0.0%
20.0%
40.0%
60.0%
80.0%
Percent ARC Zones Above/Below Census Population Criteria (800 / zone)
Below Census Criteria 21.3%
Above Census Criteria 78.7%
Percentage of Zones
Resident TAZ Population
Zero 10,548 6.3
1-49 14,210 8.5
50-99 7,912 4.7
100-199 13,014 7.8
200-499 28,770 17.3
500-749 17,773 10.7
750-999 13,813 8.3
1000-1999 32,682 19.6
2000-2999 13,831 8.3
3000-3999 6,588 4.0
4000-4999 3,418 2.0
5000+ 1,797 3.0
Workplace TAZ WorkersZero Workers 17,000 10.2
1-49 Workers 31,257 18.7
50-99 Workers 18,362 11.0
100-199 Workers 23,653 14.2
200-499 Workers 33,989 20.4
500-749 Workers 13,364 8.0
750-999 Workers 7,890 4.7
1000-1999 Workers 12,889 7.7
2000-2999 Workers 4,126 2.5
3000-3999 Workers 1,728 1.0
4000-4999 Workers 917 0.5
more than 5,000 Workers 486 0.9
Population and Worker Size Population and Worker Size Distribution of 2000 TAZs Distribution of 2000 TAZs