Polygon Attributes: 
  
USA_1995:  In USA as of end of 1995 
  
USA_1996:  In USA as of end of 1996 
  
USA_1997:  In USA as of end of 1997 
  
USA_1998:  In USA as of end of 1998 
  
USAS:      A filed which combines the values of the previous fields. 
  
The value for these attributes may be: 
     M  =  metropolitan urban service area 
     L  =  local urban service area 
     N  =  not in an urban service area. 
  
  
Line Attributes: 
  
CO_BND:        County boundary (Y/N) 
  
MCD_BND:       MCD boundary (Y/N) 
  
USA_1995_BND:  USA boundary as of end of 1995 
  
USA_1996_BND:  USA boundary as of end of 1996 
  
USA_1997_BND:  USA boundary as of end of 1997 
  
USA_1998_BND:  USA boundary as of end of 1998 
  
The value for these attributes may be: 
     M  =  metropolitan urban service area boundary 
     L  =  local urban service area boundary 
     N  =  not an urban service area boundary 
  
SOURCE:        The source of the line data.  Values are: 
 
     MUSA-1995:  These lines were transferred from municipal  
          comprehensive plan maps at a variety of scales on to  
          Mn/DOT Street Series mylars.  The lines on the mylars  
          were then digitized using the 1992 Mn/DOT roads layer as  
          a reference base.  No further documentation exists as to the  
          method of digitizing.  Significant errors have been found in  
          these lines.  Observed errors include lines that differ  
          significantly from the parcel boundaries that they are  
          supposed to represent and lines that do not follow the  
          correct alignment of the MUSA, leaving out or including  
          incorrect (sometimes very large) pieces of land. 
     MUSA-PARC:  Indicates line work that was digitized using a  
          county parcel layer as a base.  These lines correctly follow  
          the parcel boundaries where they can be defined from the  
          maps provided by communities for comprehensive plans  
          and amendments.  These lines are all expected to lie within  
          10 meters of the digital county parcel boundary lines, with a  
          majority of them lying within 2 meters.  Some of maps  
          provided by the communities, however, do not contain  
          parcel boundaries, or are at such a scale that following  
          parcel boundaries becomes difficult.   
     MUSA-CMPLN:  Indicates line work that was digitized without the  
          help of county parcel boundaries, but with other large-scale  
          reference layers, including digital orthophotography with a  
          resolution of 0.6 meters.  The positional accuracy of most of  
          these lines is estimated to be 10 to 25 meters.  A small  
          number of lines will be significantly less accurate.  These  
          occur where maps supplied by communities and/or base  
          reference data used by the Metropolitan Council  
          (orthophotos) do not have sufficient detail to properly  
          locate the boundary line.   
     DAKO-MCD:  Dakota County MCD boundary data as of  
          October 1998: estimated +or- 0.2 feet on lines that follow  
          the PLS or well described parcels.  90% of lines are  
          estimated to be within 0.5 feet of true location.  Some  
          problem areas exist.  For example, many questions exist as  
          to where the boundary of Mendota is supposed to be. 
     SCOT-MCD:  Scott County MCD boundary data as of November  
          1998:  Township boundaries that follow PLS lines are  
          estimated at between 0.4 ft. and 1 ft. of true location.  City  
          boundaries that follow PLS lines are also expected to be  
          near this range of accuracy.  Other boundaries are thought to  
          be within 20 or 40 ft.  
     WASH-MCD:  Washington County MCD boundary data as of  
          September 1998.  Positional accuracy estimated at about 3 ft. 
     DOT96-MCD:  MnDOT's 1996 Municipal boundary layer from  
          'BaseMap '97' CD.  Positional accuracy estimate is 40 ft. 
     DOT96-CO:  MnDOT's 1996 County boundary layer from  
          'BaseMap '97' CD.  Positional accuracy estimate is 40 ft. 
     METC-MCD:  Metropolitan Council's 1990 MCD boundary layer. 
          Positional accuracy is unknown, but is estimated to be  
          approximately 40 ft. 
     CITY-CMPLN:  Lines are derived from paper City  
          Comprehensive Plan Amendments digitized using  
          Metropolitan Council digital orthophotos for reference.   
          This source is used only for recent annexations where  
          MCD boundary data is not available from the county.   
          Lines are estimated to have about a 40 ft. positional  
          accuracy. 
     FUDGE-##:  In some cases, lines from two different data  
          sets never actually touched.  In these cases, 'fudge' lines  
          were added to connect the lines to insure that the layer was 
          topologically clean.