Price, Curtis Clawges, Rick 1999 1.0 map Open-File Report 99-78 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr99-78_metropop This data set describes metropolitan areas in the conterminous United States, developed from U.S. Bureau of the Census boundaries of Consolidated Metropolitan Statistical Areas (CMSA) and Metropolitan Statistical Areas (MSA), that have been processed to extract the largest contiguous urban area within each MSA or CMSA. This data set was designed for large-scale (1:500,000 or smaller) analyses of relations between metropolitan areas and other landscape characteristics. This data set was created for use in the national analysis of ground-water quality data of volatile organic compounds (VOCs) by the U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) VOC National Synthesis Team. REVIEWS APPLIED TO DATA This electronic report was subjected to the same review standard that applies to all U.S. Geological Survey reports. Reviewers were asked to check the topological consistency, tolerances, attribute frequencies and statistics, projection, and geographic extent. The reviewers checked the metadata and a_readme.1st files for completeness and accuracy. REFERENCES CITED Consortium for International Earth Science Information Network (CIESIN), 1995, Socioeconomic Data and Applications Center (SEDAC), Archive of Census Related Products: CIESIN/SEDAC, accessed July 21, 1998 at URL http://sedac.ciesin.org/plue/cenguide.html Environmental Systems Research Institute, Inc. (ESRI), 1997, ARC/INFO 7.1.1 help, Redlands, Calif., [on-line documentation]. Hitt, K.J., 1995, Refining 1970's land-use data with 1990 population data to indicate new residential development. USGS Water-Resources Investigations Report 94-4250. http://wwwrvares.er.usgs.gov/nawqa/WRI94-4250.html U.S. Bureau of the Census, 1995, County and city data book 1994, Washington, D.C., CD-CCDB-94, [cd-rom disk]. NOTES Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ARC/INFO-specific terminology. 1990 The metropolitan areas defined in this data set were delineated using values of population from 1990. Complete None planned -126.99717362 -67.05478737 48.48484187 23.65882979 None metropolitan city population inlandWaters None Conterminous 48 United States None None Curtis V. Price U.S. Geological Survey Physical Scientist mailing address

1608 Mountain View Rd

Rapid City South Dakota 57702 United States of America 1-888-275-8747 (605) 355-4523 cprice@usgs.gov none Compilation of the data sets was supported by the National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey. The objectives of the NAWQA Program are to: (1) describe current water-quality conditions for a large part of the Nation's freshwater streams, rivers, and aquifers, (2) describe how water quality is changing over time, and (3) improve the understanding of the primary natural and anthropogenic factors that affect water-quality conditions. National analysis of data, based on aggregation of comparable information obtained from across the United States, is a major component of the NAWQA Program. These data sets were created in support of NAWQA national data analysis activities. Public Unclassified None Operating System: UNIX, ARC/INFO version 7.1.1 Polygon topology present. This data set includes all known large metropolitan areas in the conterminous United States. No tests performed No tests performed U.S. Bureau of the Census 1995 map None CD-CCDB-94 Washington, D.C. U.S. Bureau of the Census CD-ROM 1994 publication date none Attributes describing metropolitan areas Lanfear, K.J. 19840816 map Reston, Virginia, USA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr99-78_metropop online 19840816 as of 1983 county2m US county polygons and attributes Consortium for International Earth Science Information Network 19950627 map NA NA NA Information available online ftp://ftp.ciesin.org/pub/census/grid/us 2000000 online 19900101 ground condition none Array of population density values. ARC/INFO software and commands (ESRI, 1995) were used to create this data set. ARC/INFO commands and modules are shown below in capital letters. Step 1. The U.S. counties data set (1:2 million scale) from the U.S. Geological Survey Digital Line Graph (DLG) data base (USGS/WRD version: http://water.usgs.gov/lookup/getspatial?county2m) was aggregated into MSAs and CMSAs using the list of counties and metro areas file "cof01.dat" from the U.S. Bureau of the Census County and City Data Book CD-ROM (U.S. Bureau of the Census, 1995). Metro area names and 1992 population also were pulled from this data file. Step 2. A grid of metropolitan areas was created by relating the county coverage to the cof01.dat data table and using the item CYCICODE from the related table as a grid item. This metropolitan area grid was created to be coincident with the CIESIN population grid (Consortium for International Earth Science Information Network, 1996) which was used to reselect out "populated areas." The CIESIN population grid was prepared using data from the U.S. Bureau of the Census STF3A files. Step 3. The CIESIN population grid (1996) of persons per square kilometer was used to reselect out all areas of the metropolitan area grid that were "residential areas," that is, all areas where population was greater than 50 persons per square kilometer (see Hitt, 1994). Step 4. The ARC/INFO GRID REGIONGROUP() function was used to group each contiguous metropolitan zone, and then areas were calculated with ZONALSTATS. Then INFO was used to tag the largest contiguous zone of populated land in the VAT of the contiguous zone grid. Finally, SELECT() was used to select the largest contiguous zone and output it to the final grid. Step 5. The metropolitan area grid was converted to a polygon coverage using the GRIDPOLY command; items from the metro areas from the County/City Data Book described above were joined to the metropolitan area coverage's polygon attribute table. Step 6. Internal polygons ("doughnut-hole" polygons) in the metro coverage were removed using the ARC ELIMINATE command with the following select expression: > RESELECT GRID-CODE < 0 AND AREA > 0 19951023 Vector Point 266 String 364 GT-polygon composed of chains 267 Albers Conical Equal Area 29.5 45.5 -96 23 0.00000 0.00000 coordinate pair 441.8791503906 441.8791503906 METERS North American Datum of 1927 Clarke 1866 6378206.4 294.98 There is a polygon attribute table associated with this file: METROPOP.PAT: >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 4 12 F 3 > 5 PERIMETER 4 12 F 3 > 9 METROPOP# 4 5 B - > 13 METROPOP-ID 4 5 B - > 17 CYCICODE 4 4 C - METRO > 21 CODE 4 5 B - > 25 AREANAME 60 60 C - AN > 85 AREANAME2 60 60 C - > 145 POP60 8 10 F 0 > 153 POP70 8 10 F 0 > 161 POP80 8 10 F 0 > 169 POP90 8 10 F 0 > 177 POP92 8 10 F 0 AREA is the area of the polygon in square meters PERIMETER is the perimeter of the polygon in meters METROPOP# is a program-generated feature identity number METROPOP-ID is a user-assigned feature identity number CYCICODE is a code number identifying a metropolitan area from the County and City Data Book (U.S. Bureau of the Census, 1995). This code is a character string and includes leading zeros. CODE is an integer version of this code (no leading zeros). AREANAME is the name of the metropolitan area from the County and City Data Book (U.S. Bureau of the Census, 1995). AREANAME2 is AREANAME modified to exclude labelling for metropolitan statistical area (more useful for labeling the areas on a map). POP60 is the population of the metropolitan area in 1960 from U.S. Bureau of the Census (1995). POP70 is the population of the metropolitan area in 1970 from U.S. Bureau of the Census (1995). POP80 is the population of the metropolitan area in 1980 from U.S. Bureau of the Census (1995). POP90 is the population of the metropolitan area in 1990 from U.S. Bureau of the Census (1995). POP92 is the population of the metropolitan area in 1992 from U.S. Bureau of the Census (1995). None U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Export Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/ofr99-78_metropop.e00.gz DLG Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/ofr99-78_metropop.dlg.tgz SDTS Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/ofr99-78_metropop.sdts.tgz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ofr99-78_metropop FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998