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<br />Street-level assignment of households <br />The basic ingredients for allocating the nation's households to streets that they live on are: lhe <br />TIGER Line 2003 database; the April 2004 USPS ZIP+4 inventory; and the corresponding <br />ADVO ZIP+4 database of active residential deliveries. These dala are geocoded and <br />processed inlo a database of 27.9 million Blook Face Points (BFP) which link postal delivery <br />data by address to the street segments that border or are intemalto Census blocks. While the <br />8 million 2000 Census blocks will remain sIalic throughout this decade, each year the BFPs <br />continue to grow in number as the street network expands to accommodate residential growth. <br />Map 2 shows the distribution of the BFPs along the street network in block group 9201.07-1 and <br />the surrounding community. <br /> <br />Importance of the MicroGrid cartography <br />Scan/US, Inc. MicroGrid cartography was designed to capture the distribution and density of <br />residential and business development throughout the United States at the level of detail suttable <br />for location-specific analysis. The MicroGrid cartography is annually updated to accurately <br />reflect change in the distribution. Microgrids make up a latticework of 1.9 million grid squares, <br />pinned to latitude and longitude. which serve as containers lor summary data on population, <br />households and businesses. Where there is any locatable residential or commercial activity you <br />will find grids of three sizes. A minute grid approximates 1 square mile, a lii-minute grid <br />approximates .25 square mile and a 1118-mlnutegrid approximates .0625 square mile. The <br />density of development determines the siZe of the grid: the denser the development the smaller <br />the grid. Where there is no development there are no grids. Block group 9201.07 -1 at 5 square <br />miles in size covers 5 times the area of the largest grid and 80 times the area of the smallest <br />grid. When the BFPs in block group 9201.07-1 are summarized by microgrids, the spatial <br />representation of new households on the landscape becomes dramatically more precise. <br /> <br /> <br />Map 3: Scan/US MicroGrid geography overlaid on BG 9201.07-1 and the BFPs <br /> <br />SeaNUS Motllodology White Paper <br /> <br />3 <br /> <br />L______ <br />