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TOPOGRAPHIC MAP A MAP WHICH SHOWS ELEVATION OF THE LAND WITH THE USE OF CONTOUR LINES, SHAPES, AND SYMBOLS CONTOUR LINES LINES DRAWN TO CONNECT POINTS.

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Presentation on theme: "TOPOGRAPHIC MAP A MAP WHICH SHOWS ELEVATION OF THE LAND WITH THE USE OF CONTOUR LINES, SHAPES, AND SYMBOLS CONTOUR LINES LINES DRAWN TO CONNECT POINTS."— Presentation transcript:

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2 TOPOGRAPHIC MAP A MAP WHICH SHOWS ELEVATION OF THE LAND WITH THE USE OF CONTOUR LINES, SHAPES, AND SYMBOLS CONTOUR LINES LINES DRAWN TO CONNECT POINTS OF THE SAME ELEVATION

3 ELEVATION CONTOUR INTERVAL- THE DIFFERENCE IN ELEVATION BETWEEN TWO CONSECUTIVE CONTOUR LINES INDEX CONTOUR- EVERY FOURTH OR FIFTH LINE WHICH IS DARKENED FOR EASY READING

4 STEEPNESS OF SLOPES CLOSER CONTOUR LINES = STEEP SLOPES WELL-SPACED CONTOUR LINES = FLATTER, GENTLE SLOPES THE SHAPE OF THE LAND AT VARIOUS HEIGHTS

5 ( SINKHOLE, QUARRY, MINE) MEASURED USING A HACHURE LINE **FIRST DEPRESSION LINE TAKES THE VALUE OF THE CONTOUR LINE SURROUNDING IT THE “WHISKERS” POINT TO THE LOWER ELEVATION

6 A BENCHMARK POINT IS A LOCATION WHOSE EXACT ELEVATION IS KNOWN AND IS NOTED ON A BRASS ALLUMINUM PLATE ( BM )

7 A MAXIMUM ELEVATION- HIGHEST POSSIBLE ELEVATION FIGURE OUT WHAT THE NEXT POSSIBLE CONTOUR LINE WOULD BE THEN SUBTRACT 1 UNIT MINIMUM ELEVATION- LOWEST POSSIBLE ELEVATION THE NEXT POSSIBLE DEPRESSION LINE, THEN PLUS 1 UNIT

8 RIVERS CUT A VALLEY AND CAUSE CONTOUR LINES TO FORM A V-SHAPE POINTING TO THE SOURCE OF THE STREAM (UPSTREAM). GRADIENT = CHANGE IN ELEVATION (ft) DISTANCE (mi)

9 RELIEF- DIFFERENCE IN ELEVATION RELIEF MAP – RAISED MAP WHICH SHOWS DIFFERENCE IN ELEVATION(3-D) PROFILE- SIDE VIEW OF THE SHAPE OF THE LAND ON A TOPOGRAPHIC MAP


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