Topographic Maps. An introduction. Topographic Maps. These are specialized maps which show the relief (highs and lows) of the Earth’s surface. The relief is shown with iso lines (iso = same) called contour lines . . contour lines.By chance
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Relief is so perfectly and accurately represented on topographic maps that if you look on them at a distance of 1 meter you will see crests and valleys, as on a thermoformed map. In the following, you will learn the different techniques used to represent relief on topographic maps. Contour lines
Contour Lines. Elevation on Topographic Maps. What is a contour line?. A contour line on a map is a line that joins points of equal elevation . If you walk along a contour line you neither gain or lose elevation. Measured in metres (in Canada) or feet (in USA). Contour Interval.
CONTOUR LINES. Source: CAPS Oxford Successful Social Sciences Learner’s book Gr. 9 p. 10. CONTOURS ARE LINES ON A MAP THAT JOIN PLACES OF THE SAME HEIGHT ABOVE SEA LEVEL. COUNTOURS MAKE PATTERNS SHOWING THE RELIEF OR SHAPE OF LAND. FACTS ABOUT CONTOURS:. Contour lines never cross one another.
Contour lines. Contour lines: curved lines drawn on the map, connecting points having the same elevation. Contour interval: is the vertical distance between successive contour lines Example: 0.5m, 1m, 2m, 5m, 10m, 20m, 50m
Contour Lines . Contour line- line that connects points of equal elevation. Elevation- height above or below sea level. Contour interval- difference in elevation between adjacent contour lines. The closer contour lines are, the steeper the slope.
Contour Lines. Contour: the outline of a shape or form 19 th Century Drawing by Kasushika Hokusai. Contour lines. One of the first things we draw Our brains are “ programmed ” to see edges and lines: http://www.youtube.com/watch?v=4nwpU7GFYe8&feature=related. Contour Lines.
CONTOUR LINES…. …lines to show elevation and the shape of the land. Relief. The representation of the shapes of hills, valleys, streams and other features of the earth’s surface
Cross Contour Lines. Cross contour lines are drawn lines which travel, as the name suggests, across the form. Cross contours may be horizontal, vertical or both. Often, in more complex forms, cross-contours will be drawn at varying angles. Jean-François Millet. Patrick Seymour.
p. 320 fig 19.14 Give the height at the following places; 616515 597508 660512 643533 635553 635509 659539. P320 fig 19.15 Which feature is at the following places -choose from; gentle slope, steep slope, hill, valley 445093 491112 441111 475108 439105 467130 455117 467100.
Field Maps- Contour Lines-B. Mr. Cesaire Martin Van Buren High School. Aim: What types of information can we learn from field maps. Do Now: Read page 15-16 Ans 28 to 30 from the green review book in the back. HW Read pages 32 to 35. Answer questions 1to 10.