I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points.
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Transcript of I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points.
Notice: any place INSIDE a contour line is HIGHER than the contour line. Any place OUTSIDE a contour line is LOWER than the contour line.
Contour lines bend to form a V when they cross a river. The V points upstream. Therefore, the river flows the other way.
Contours betw. 517’ and 1397’ are fine. But, you cannot have a 1200’ line INSIDE a 1200’ line, and 1000’ line INSIDE a 1200’ line.
Everything insidea contour is supposed to beHIGHER than thecontour.
DEPRESSION CONTOUR: indicated with “teeth” called HACHURES.
Hachured contours:a point inside a contour is lowerthan the contour.
--A point outside a contour is higherthan the contour.
From the rim, the land goes down on BOTH sides—towards the outside of the volcano and inside the crater.
NOTICE: the slope from atop Mt. Tipster is much STEEPER down to sea than the slope from atop Mt. Riddle down to sea.
NOTICE: where the slopes are STEEPER the contour lines are CLOSER. Where the slopes are GENTLER the contour lines are FURTHER APART.