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I. Contour Maps-- Introduction 20 September 2007

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Page 1: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

I. Contour Maps--Introduction

20 September 2007

Page 2: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

RELIEF: difference in elevation between two points.

Page 3: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

Why are theretwo roads fromLouberg to Luluville?

.

Page 4: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

Dingle Rd. goes around the Mts.while Bo Ring Waygoes UP & OVER thethe Mts.

Page 5: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

CONTOUR LINE: connects points of EQUAL elevation (BROWN LINE)

A map with topographic

contours.

Page 6: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points
Page 7: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points
Page 8: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

CONTOUR INTERVAL: distance in elevation between consecutive contour lines

Page 9: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

The island from above.

Page 10: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

II. Labeling Contours

Page 11: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

Island with itsCONTOUR LINES.

Page 12: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

Looking downfrom above.

Page 13: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points
Page 14: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

Contour Interval(C.I.)=250 feet.

--Labeling EVERY line with an elevation getstoo cluttered.

Page 15: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

Instead, we use an INDEX INTERVAL: every FIFTH line is labeled and thicker.

Page 16: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

BENCHMARK: an exact point of elevation that can be marked with an X, +, or BM.

Page 17: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points
Page 18: 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.

Page 19: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

III. The V Rule

Page 20: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

Contour lines bend to form a V when they cross a river. The V points upstream. Therefore, the river flows the other way.

Page 21: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

NOTES ARE FINISHED FOR TODAY (20 Sept. 2007)

Work on assignment until the bell.

Page 22: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

IV. Depression Contours—Getting into and out of a hole.

20 September 2006

Page 23: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

The highest point (1397’) is on the rim between its outer slopes and crater.

C.I.=200’

Page 24: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

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.

Page 25: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

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.

Page 26: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

From the rim, the land goes down on BOTH sides—towards the outside of the volcano and inside the crater.

Page 27: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points
Page 28: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

V. Contour Spacing and Steepness

Page 29: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

NOTICE: the slope from atop Mt. Tipster is much STEEPER down to sea than the slope from atop Mt. Riddle down to sea.

Page 30: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

NOTICE: where the slopes are STEEPER the contour lines are CLOSER. Where the slopes are GENTLER the contour lines are FURTHER APART.

Page 31: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

What happens if you have a VERTICAL cliff?????!!!!!!!

Page 32: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

With a cliff, the contours will come together and merge. THIS IS THE ONLY TIME CONTOURS TOUCH!

Page 33: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points

THE END

Work on assignment for remainder of class.

20 September 2006

Page 34: I. Contour Maps--Introduction 20 September 2007 RELIEF: difference in elevation between two points
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Contour Map - Loyola University Marylandmath.loyola.edu/~chidyagp/sp16/contour_lines.pdfContour Map Remarks 1 If you walk along a contour line, you will neither gain or lose elevation

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OCOGNIriV'E PROCESS IN INTERPRETING THE CONTOUR-LINE ... · OCOGNIriV'E PROCESS IN INTERPRETING THE CONTOUR-LINE PORTRAYAL OF TERRAIN RELIEF KENNETH D. CROSS STEVEN M. RUGGE ANACAPA

APPENDIX 1 REGIONAL BASEMAP INFORMATION · APPENDIX 3 ELEVATION RELIEF Elevation Metrics (feet above mean sea level) Mean Minimum Maximum 531.6 254.4 1169.7 Elevation Range ACRES