Product Description
Digital Line Graphs (DLGs)
are digital vector representations of cartographic information
derived from USGS maps and related sources.
Selective coverage available. Depending on scale, the
following layers (or categories of feature type) may be available:
|
Layer |
Feature Type |
|
Public Land Survey System (PLSS) |
Township, range,
and section lines |
|
Boundaries |
State, county,
city, and other national and State lands such as forests and
parks |
|
Transportation |
Roads and trails,
railroads, pipelines and transmission lines |
|
Hydrography |
Flowing water,
standing water, and wetlands |
|
Hypsography |
Contours and
supplementary spot elevations |
|
Non-vegetative features |
Glacial moraine,
lava, sand, and gravel |
|
Survey control and markers |
Horizontal and
vertical monuments (third order or better) |
|
Manmade features |
Cultural features,
such as building, not collected in other data categories |
|
Vegetative surface cover |
Woods, scrub,
orchards, and vineyards |
Large-Scale (7.5-minute) DLGs correspond to
the USGS 1:20,000-, 1:24,000-, and 1:25,000-scale topographic
quadrangle maps.
ChartTiff allows for the projection of the
USGS
DLG in UTM - (Universal Transverse Mercator), State Plane, or
Latitude / Longitude. They can be referenced to either
the North American Datum (NAD) of 1927 (NAD27) or 1983
(NAD83). or WGS72 or WGS84.
ChartTiff allows for ESRI Shape or AutoCAD
DXF output file formats.
ChartTiff DLGs are NOT included in the 1
Free Download Offer.
See Samples page to download
sample DLGs
|
