Procedures involved in compiling the boundary data include (1) obtaining 1 meter digital imagery and ancillary data for collecting, interpreting, and classifying the boundary features, (2) compiling the Digital Line Graph (DLG) vector data by 1:24,000-scale USGS quadrangle tiles, (3) merging the 1:24,000-scale quadrangle tiles into one seamless data set, and (4) translating and reattributing the features into user-friendly data sets. The translated attribution is described below in the Supplemental_Information section.
Base cartographic layers are part of the USGS FRIR project cooperative effort to provide qualitative and quantitative information about infrastructure (aggregate, energy, water, habitat) features needed by growing urban regions like the Denver metropolitan area. The objective of the project is to develop GIS information about boundaries and other themes in such a way that decision makers can use this information to make land use planning decisions, growth models and will be used by the project scientists for multiple studies of the changing landscape of the Front Range and the impact on various resources.
In addition to boundaries, the USGS has created six other base cartographic layers consisting of: roads (FRIRD), miscellaneous transportation (FRIMT), railroads (FRIRR), manmade structures (FRIMS), public land survey system (FRIPL), and hydrography (FRIHY). Boundaries FRIBD contains line and polygon attributed features. The data layers are available at (<URL:http://rockyweb.cr.usgs.gov/frontrange/datasets.htm>)
See (<URL:http://rockyweb.cr.usgs.gov/nmpstds/dlgstds.html>) for the complete document of DLG attributes.
Field Definitions:
CAT Theme Category
PIC Primary Identification Code
DSC Descriptive Code
LABEL Feature Definition
FST FIPS State Code
FCO FIPS County Code
FCI FIPS City Code
MCD Minor Civil Division
CITY City Name
COUNTY County Name
MATT Redefined PIC and DSC Codes into one field
SAMPLE .PAT INFO FILE:
CAT = 9 boundary category
PIC =101 incorporated city, village, town, borough, or hamlet
DSC =999 no descriptive attributes
FST = 8 FIPS state code
FCO = 1 FIPS county code
FCI =27425 FIPS city code
MCD = 0 no Minor Civil Division attributes
LABEL = administrative description
CITY = city name
COUNTY = county name
** REDEFINED ITEMS **
MATT =101999 Redefined from PIC and DSC
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!! ATTENTION !!
NEATLINE: designated by PIC and DSC codes of 777
NULL VALUES: '9's are used to fill blank fields
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SAMPLE .AAT FILE:
CAT = 9 boundary category
PIC =707 city boundary
DSC =999 no DSC codes
LABEL = city boundary
** REDEFINED ITEMS **
MATT =707999 redefined from PIC and DSC
** PIC codes for POLYGON features:
PIC Definition
101 incorporated city, village, town, borough, or hamlet
103 national park, monument, lakeshore, seashore, parkway, battle-
field, rec area
104 national forest/grassland
108 military reservation
110 federal prison
111 miscellaneous federal reservation
129 miscellaneous state reservation
130 state park, recreation area, arboretum, or lake
131 state wildlife refuge, game preserve, or fish hatchery
150 county park
151 city park
** PIC codes for LINE features:
PIC Definition
702 county boundary
704 incorporated city, village, town, borough, or hamlet boundary
705 federal reserve, park boundary
706 state park boundary
707 city or county park boundary
The data was collected for government use and represents the results of data collection for a specific activity. USGS makes no representation as to the suitability or accuracy of the data for any other purpose and disclaims any liability for errors that the data may contain. As such, it is only valid for its intended use, content, time, and accuracy specifications. While there are no explicit constraints on the use of the data, please exercise appropriate and professional judgment in the use and interpretation of this data.
Acknowledgment of the U.S. Geological Survey would be appreciated for products derived from this data.
See Entity_and_Attribute_Information and Supplemental_Information sections.
See capture conditions in Part 2-:Standards for Digital Line Graphs and at (<URL:http://rockyweb.cr.usgs.gov/nmpstds/dlgstds.html>)
FRIBD.PAT:
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
1 AREA 8 18 F 5
9 PERIMETER 8 18 F 5
17 FRIBD# 4 5 B -
21 FRIBD-ID 4 5 B -
25 CAT 2 2 I -
27 PIC 3 3 I -
30 DSC 3 3 I -
33 FST 2 2 I -
35 FCO 3 3 I -
38 FCI 5 5 I -
43 MCD 5 5 I -
48 LABEL 50 50 C -
98 CITY 30 30 C -
128 COUNTY 30 30 C -
** REDEFINED ITEMS **
27 MATT 6 6 I -
FRIBD.AAT:
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
1 FNODE# 4 5 B -
5 TNODE# 4 5 B -
9 LPOLY# 4 5 B -
13 RPOLY# 4 5 B -
17 LENGTH 8 18 F 5
25 FRIBD# 4 5 B -
29 FRIBD-ID 4 5 B -
33 CAT 2 2 I -
35 PIC 3 3 I -
38 DSC 3 3 I -
41 LABEL 50 50 C -
** REDEFINED ITEMS **
35 MATT 6 6 I -
CAT Theme Category (DLG Boundaries = 090) PIC Primary Identification Code DSC Descriptive Code LABEL Feature Definition FST FIPS State Code FCO FIPS County Code FCI FIPS City Code MCD Minor Civil Division CITY City Name COUNTY County Name MATT Redefined PIC and DSC Codes into one field
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.