Topographic Base Maps Objective – Displays surface features (topography, roads, lakes & river,...
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Transcript of Topographic Base Maps Objective – Displays surface features (topography, roads, lakes & river,...
![Page 1: Topographic Base Maps Objective – Displays surface features (topography, roads, lakes & river, cultural features) and a grid system (TRS, UTM, Lat/Lon)](https://reader035.fdocuments.us/reader035/viewer/2022062804/56649d5d5503460f94a3c405/html5/thumbnails/1.jpg)
Topographic Base MapsTopographic Base Maps Objective – Displays surface features (topography, Objective – Displays surface features (topography,
roads, lakes & river, cultural features) and a grid roads, lakes & river, cultural features) and a grid system (TRS, UTM, Lat/Lon) that allow one to system (TRS, UTM, Lat/Lon) that allow one to readily locate the geologic features portrayedreadily locate the geologic features portrayed
Best choice of base map is largely dependent on Best choice of base map is largely dependent on the map scale the map scale
1:24,000 scale (7.5’ USGS quadrangle)1:100,000 scale (30’x60’ USGS sheet)
GEOL 3000GEOL 3000
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Global Grid – Latitude-LongitudeGlobal Grid – Latitude-Longitude
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Map ProjectionsMap Projections
Mercator
Transverse Mercator
Conical
Polyconic
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Universal Transverse Mercator Universal Transverse Mercator (UTM) Grid(UTM) Grid
Two Versions of North American Datum (NAD) grid – 1927 and 1983
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Surveyed Grid Surveyed Grid Township, Range, SectionTownship, Range, Section
Section ~1 sq. mile
Township ~36 sq. miles
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Potential Misfit of Surveyed Potential Misfit of Surveyed SectionsSections
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Grids on Topographic MapsGrids on Topographic Maps
Latitude Longitude
TownshipBoundary
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Other Information on Topographic Other Information on Topographic MapsMaps
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Elements of the Elements of the Topographic Topographic
MapMap
USGS Topographic Map Symbol Website
<click here>
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Topographic Contour LinesTopographic Contour Linesconnects points of equal elevationconnects points of equal elevation
Rules:Rules:
• Lines never cross
•Lines never end
•Lines “V” upstream
•Lines encircle hills and depressions
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Reading TopographyReading Topography
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Creating a Creating a Topographic Topographic
ProfileProfile
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Intersection of Topography and Geology Intersection of Topography and Geology
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Standard Topographic Basemap ScalesStandard Topographic Basemap Scales
1° x 2 ° Sheets1:250,000
1” = 4 miles
7.5’ Quadrangles1:24,000
1” = 2000 feet
See DNR Maps Website for MN topo maps<click here>
Also: 30’x60’ sheets, 1:100,000, 1”=1.5 miles