1 Apr
2009
1 Apr
'09
12:15 p.m.
Good Afternoon Martin:
I've been following the soap opera of "removal from da list" and almost
deleted your correspondence. I wanted to let you know that I've geocoded
(about 98%) the property appraiser files for Y08 to a parcel centroid
about 9 million records. I think you might find this useful in your
modeling process. It is very straightforward to pour this data into
census tracts and block groups. The quality of the census geography
makes block assignment somewhat iffy (getting high tech here). Let me
know if you've any interest in this or our statewide Future Land Use
coverage. I hope all is going well for you.
Jim Hatchitt
352-333-8393
Catala, Martin wrote:
I want to thank everyone for their input and assistance. A great
education for me.
After several e-mails it became apparent that what I really needed was
the LEHD data…Again thanks for all you input…very HELPFUL!
*From:* ctpp-news-bounces(a)chrispy.net
[mailto:ctpp-news-bounces@chrispy.net] *On Behalf Of *Patty Becker
*Sent:* Friday, March 27, 2009 11:00 AM
*To:* ctpp-news(a)chrispy.net
*Subject:* Re: [CTPP] Question about PUMS data and Geography
Martin,
The 1% and 5% don't exactly refer to geography. They refer to the
sampling fraction; the proportion of the total resondents who are
included in the PUMS files.
PUMS geography is based on PUMAs (Public Use Microdata Sample areas)
for the 5% files; these have to be at least 100,000 population. The 1%
file uses super-PUMAs, which have to be at least 250,000 in population
size. Your state data center should be able to tell you what the PUMAs
are for your state or area; they're also included in the 2000 census
PUMS documentation.
Hope this helps.
Patty Becker
At 03:37 PM 3/25/2009, you wrote:
Hello,
I am looking to create some commute flow maps and I think I remember
someone mentioning (between all the please remove me from this list
e-mails) that flow maps can be created by using ACS data and the PUMS
geography. I was at the Census site trying to download the PUMS
geography files and found that there were two types 1% and 5%. Does
anyone know which geography file I should use? The 1% or the 5%?
Thanks in advance,
Martin Catala
GIS Manager
CUTR
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Patricia C. (Patty) Becker 248/354-6520
APB Associates/SEMCC FAX 248/354-6645
28300 Franklin Road Home 248/355-2428
Southfield, MI 48034 pbecker(a)umich.edu
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James Hatchitt
8132 SW 45th Ln.
Gainesville, Fl. 32608
352-333-8393
jim(a)armasi.com