Digital Line Graph:
Original - UTM - NAD27 - Meters
About the Data
The original DLGs were created from published quad sheets as they existed in 1990.
Projection:
UTM Projection (Zone 16 is west of 84° longitude; 17 is east)
Datum:
NAD27
Units:
Meters
File Type:
ASCII (Text) Format
Determining the File Name
You will need to know the 250k and 100k quad names and the DEP quad number.
Use the Geographic Profile or the
DEP Quad Map Index to find the DEP quad name and number.
THEMES:
BND:
Political Boundaries
HYD:
Hydrography
PIP:
Pipelines
RDS:
Roads
RRS:
Railroads
Special Software Needed
DLGs are text files and must be converted into graphic format before being used in a GIS. There are many conversion programs available. Usually a GIS will provide its own DLG conversion utility.
Enter FTP Site
These files are available in two packages:
By Individual Quad - The individual quad .zip files are organized by 100k sheets.
By 250k Sheet - Download all 1:24,000 dlg files for a 250k quad area in one file. The 1:24,000 dlg files can be accessed individually once the .zip file is downloaded and unzipped.
The FTP folders are organized by 100K and 250K sheet number and the files are identified by USGS quad numbers.