2011 EESA01 Assignment 2 Presentation_final

2011 EESA01 Assignment 2 Presentation_final - Assignment 2...

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Assignment 2 Tutorial: Maps and Map skills Maps and Map skills for Environmental for Environmental Science Science EESA01 Fall 2011
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Agenda Topographic Map Introducing: Map scale (horizontal distance) Contour lines (elevation height) elevation height / horizontal distance = slope VS gradient Drawing topographic profiles Drawing contour lines
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Types of Maps Commonly use Google Maps Tells us little about geographical features We can’t discern the valley behind UTSC! Source: Google Maps
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Types of Maps Topographical maps Identify: landforms, terrain, drainage, forest cover etc. Showing contour lines of different elevation levels Source: atlas.nrcan.gc.ca
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Topographic map
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Topographic map – features and symbols Scale
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Map Projection Map Coordinates: Longitude (east-west) & Latitude (north-south) are used to identify point location on curved surface (ie. Earth) Universal Transverse Mercator (UTM) – An alternative way to project maps through Flattening and Dividing Earth into zones of equal longitudes
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UTM Projection Best thing? ALL distances can be interpreted linearly and in easy to use units (meters)!! Chart showing 1 of 60 UTM zones - Coordinates measured towards east ( Easting ) then north ( Northing ) Easting value of 500 000m is the central meridian (CM; shown as red-dotted lines ) and divides each zone - Easting values west of CM is < 500 000m and values east of CM is > 500 000m Northing value is measured in a northly direction from 0 at the equator (shown as a blue line ) - Measurements south of equator has a false ‘northing’ value of 10 000 000m
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Reading Distances on a UTM Map
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Glacier 700 000m E. Easting Value Nothing Value
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Map scale Reading Distances on a Map Scale bar Distance that represents a certain real-world distance is given on the scale bar – quick visual estimation of the distance Fractional scale Fractional scales are written as fractions (1/20,000) or as ratios (1:20,000) of map distance to the equivalent distance on the ground using the same units For example: 1 cm on the map is equivalent to 20,000 cm in the real world. 20,000cm = 200m = 0.2km
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Find the fractional scale of the map if 50cm on the map = 50, 000km in real horizontal distance. Solution:
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2011 EESA01 Assignment 2 Presentation_final - Assignment 2...

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