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DOCUMENTATION ON COUNTY BOUNDARY COVERAGE
The export file cntybnd.e00 imports into a coverage with county boundaries. The county outlines in this coverage were digitized from the USGS Colorado County topographic series (1979). They were digitized from scale-stable 1:50,000 film positive composites. The digital county boundaries were appended to create the statewide coverage. The coverage includes the 1989 land transfer between Adams and Denver Counties for Denver International Airport. POLYGON ATTRIBUTES: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME DESCRIPTION 1 AREA 4 12 F 3 - 5 PERIMETER 4 12 F 3 - 9 CNTYBND# 4 5 B - - 13 CNTYBND-ID 4 5 B - - 17 CNTY 3 3 I - FIPS county fips code 20 NAME 16 16 C - county name 36 SQ.MI 4 8 F 2 area: square miles 40 ACRES 4 12 F 2 area: acres 44 REGION 2 2 I - planning & management region 46 A90 4 10 B - 1990 census population COORDINATE SYSTEM DESCRIPTION Projection UTM Zone 13 Datum NAD83 Units METERS Spheroid GRS1980 Parameters: COVERAGE DEVELOPMENT There are 199 sheets in this series from which the 63 counties were built. Each county contains the registration tics for all of the sheets associated with that county. For example, Moffat County has 7 sheets. Each sheet will have between 4 and 6 tics. The number of tics per sheet was determined by how big the sheet was. If a particular sheet was physically too big to fit on the dig- itizer it was digitized in two segments and appended. Consequently, these sheets have 6 tics. All others have 4, the minimum required for processing as an ARC/ INFO coverage. The labelling convention used for tics follows. Tics contain 4 numbers. The first two designate which county it is. These are numbered 1-63 and begin alphabetically: Adams-01 thru Yuma-63. The next number designates the sheet #. The final number is the tic number on the sheet. All tics were entered starting at the southeast corner and going clockwise. Example time.... Weld County, sheet #3, southwest corner: the tic there is 6232. In almost all cases the tic is the Lat/Long on the outer four corners of the sheet. The exceptions to this rule are 4 counties in the Metro area, and three rural counties. For these sheets the tics were the points on the UTM grid on the sheet closes to the four corners of the sheet. The reason for this is that it was not discovered until after these sheets were digitized that the film composites did not have a UTM grid on every sheet in the series. At this point the Lat/Long intersections at the corners were used exclusively. The counties with the exceptions are: ADAMS, ARAPAHOE, ARCHULETA DOUGLAS, EAGLE GARFIELD, JEFFERSON Another exception are the sheets with 6 tics on them. The two inside tics must be looked up in a tic coordinate file at the present time. The file with tic coordinates for each county is available upon request. The names of the county coverages were abbreviated as follows: ADAM KITC ALAM LAKE ARAP LAPL ARCH LARI BACA LASA BENT LINC BOUL LOGA CHAF MESA CHEY MINE CLEA MOFF CONE MONT (Montrose) COST MONZ (Montezuma) CROW MORG CUST OTER DELT OURA DENV PARK DOLO PHIL DOUG PITK EAGL PROW ELBE PUEB ELPA RIOB FREM RIOG GARF ROUT GILP SAGU GRAN SANJ GUNN SANM HINS SEDG HUER SUMM JACK TELL JEFF WASH KIOW WELD YUMA |
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