Travel Demand Model - OKI

OKI/MVRPC Travel Demand Model – Version 6.0• Due to the regional consolidation some previously external-to-external trips actually originatein the consolidated region. These trips need to have their origin geocoded for basic streetaddress and landmark information.In general, greater confidence was placed in the TAZ data than in the coordinate data. Thisresulted from the process used by ODOT to revise the previous geocoding effort. 4 A process wasdevised to assign the consolidated TAZs making extensive use of the 1995 TAZ information whenavailable, and otherwise address matching and various rules involving the zip code and landmarksurvey information. Figure 8.1 depicts the process and rules used. The pre-geocoding script,which assigned TAZs based on the 1995 TAZ data and lat/long coordinates, resolved 68% of alltrip origins. Of the remaining records, 2% were resolved through address matching, 10% wereresolved solely on the basis of the 1995 TAZ (using the zone centroid as the location of the triporigin), 2% were resolved on the basis of the survey zip code (using the location of the zip coderegion as the location of the trip origin), 0.5 % were resolved through landmark matching, 4%were assigned a ESN on the basis of the city of origin or exact origin location, and 15% remainedunresolved. Of the unresolved records, 10% are known to have started inside the consolidatedregion, 1% outside the consolidated region, and 4% are completely ungeocodable.Table 8-2 Number of Records from Stations in the Consolidated Model, OKI RegionConsolidated Model GeocodingTAZODOT Geocoding Valid TAZ Valid ESN UnknownESNUnknownUncodableTotalODOTPercentODOTExternal-InternalValid TAZ 21,196 0 0 1 0 21,197 72%TAZ unknown (9999) 933 12 2,004 684 0 3,633 12%Ungeocodable (9998) 0 0 0 0 696 696 2%External-ExternalValid ESN 538 3,204 287 40 22 4,091 14%ESN unknown (9999) 0 0 0 1 0 1 0%Ungeocodable (9998) 0 0 0 0 1 1 0%Total Consolidated 22,667 3,216 2,291 726 719 29,619Percent Consolidated 77% 11% 8% 2% 2%Table 8-3 Number of Records from Stations in the Consolidated Model, Mon/GreCountiesConsolidated Model GeocodingTAZUnknownESNUnknownTotalODOTPercentODOTODOT GeocodingValid TAZ Valid ESNUncodableExternal-InternalValid TAZ 14,249 0 241 0 0 14,490 73%TAZ unknown (9999) 112 2 1,528 29 0 1,671 8%Ungeocodable (9998) 0 0 0 0 1,090 1,090 6%External-ExternalValid ESN 472 1,677 259 26 17 2,451 12%ESN unknown (9999) 5 4 0 8 58 75 0%Ungeocodable (9998) 0 0 0 0 6 6 0%Total Consolidated 14,838 1,683 2,028 63 1,171 19,783Percent Consolidated 75% 9% 10% 0% 6%4 Please refer to Technical Memorandum: Processing of Cordon Line OD Survey Data. Ohio Department ofTransportation, Planning Division, Office of Technical Services. Volumes OKI Council of Governments,Miami Valley Regional Planning Commission, Miami Valley Expansion Area. Feb-Mar 2000.Trip Generation - External Cordon Survey Analysis 40