From kbyrnes@vdh.state.va.us Wed May 14 07:11:51 2003 Received: from mxu4.u.washington.edu (mxu4.u.washington.edu [140.142.33.8]) by lists.u.washington.edu (8.12.1+UW03.04/8.12.1+UW03.02) with ESMTP id h4EEBo1M021016 for ; Wed, 14 May 2003 07:11:50 -0700 Received: from vdhsrv20.vdh.state.va.us (vdhsrv20.vdh.state.va.us [169.134.169.20]) by mxu4.u.washington.edu (8.12.1+UW03.04/8.12.1+UW03.02) with ESMTP id h4EEBm85004260 for ; Wed, 14 May 2003 07:11:48 -0700 Received: from [169.134.120.100] by vdhsrv20.vdh.state.va.us (NTMail 7.02.3037/NT1764.00.5148df18) with ESMTP id dlvbjcaa for waphgis@u.washington.edu; Wed, 14 May 2003 10:11:43 -0400 Received: from vdh.state.va.us ([10.51.107.42]) by vdhsrv1.vdh.state.va.us (iPlanet Messaging Server 5.2 HotFix 1.02 (built Sep 16 2002)) with ESMTP id <0HEV00LB5RFH6B@vdhsrv1.vdh.state.va.us> for waphgis@u.washington.edu; Wed, 14 May 2003 10:11:42 -0400 (EDT) Date: Wed, 14 May 2003 10:08:04 -0400 From: Kevin Byrnes Subject: Re: Estimating daytime population To: waphgis@u.washington.edu Message-id: <3EC24DC4.7020301@vdh.state.va.us> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii; format=flowed Content-transfer-encoding: 7BIT X-Accept-Language: en-us, en X-Priority: 1 (highest) References: <001401c31a1c$cf8c7100$6401a8c0@harriet> X-Uwash-Spam: Gauge=XII, Probability=12%, Report="PRIORITY_NO_NAME, REFERENCES, SPAM_PHRASE_02_03, USER_AGENT, X_ACCEPT_LANG, X_PRIORITY_HIGH, __EVITE_CTYPE, __HAS_X_PRIORITY, __REFERENCES, __USER_AGENT" Dick: As a former regional transportation planner, I can answer that question! There is a special census product call the Census Transportation Planning Package. Work Destinations and occupations are cross-referenced with work origins to create data tables on the employment by urban traffic zones in metropolitan areas. You can get 1990 data for free (project subsidized by FHWA & UMTA) from this page: http://landview.census.gov/mp/www/rom/msrom6a.html From my experience working with the 1990 data and traffic zone polygon files, there were some coding problems in some areas in building the traffic zone geography from census tract , block group and block specifications. This would be one area where I would hope there is some great improvement resulting from pre-200 census advances in TIGER The 2000 data package hasn't been finalized but the product is supposed to be released this year....to monitor status: visit this link: http://www.transtats.bts.gov/DatabaseInfo.asp?DB_ID=620&Link=0 More info table specs) from this link: http://www.transtats.bts.gov/tables.asp?DB_ID=620&DB_Name=&DB_Short_Name= It might interest you to know that this program was implemented initially in 1990 under a speical contract for a data viewer version of Maptitude. It might be worth an exploratory e-mail to Peter to see if they have any plans of obtaining an packaging the data for a special Maptitude-ready data cd...it would be very worthwhile, n my opinion. Of course, there are commercially-available daytime population estimates from various sources, developed through various methodologies as well. Hope this is helpful.... Your East Coast Connection.... Kevin B Richard Hoskins wrote: >Is there anything in the census data that can allow some estimate of the >daytime population in a business area, such as downtown Seattle? The >census data says there are 31000 residents, but of course at 11am on >Monday, it is very different. Any ideas? > >Richard E. Hoskins >WA State Dept of Health >1102 Quince Street, ms 47812 >Olympia, WA 98504-7812 >richard.hoskins@doh.wa.gov >360/236-4270 >fax: 360/236-4245 > > > > > > .