map reading i introduction to map reading grc jrotc col(r) alexander
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- Map Reading I Introduction to Map Reading GRC JROTC COL(R) ALEXANDER
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- Map Reading I Outline Purpose Marginal Information Colors Terrain Features Conclusion
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- Map Reading I Purpose To lay the groundwork for successful map reading and land navigation by exposing the cadet to basic information, significant color coding, and terrain features used on maps.
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- Map Reading I Marginal Information 1 of 4 Sheet Name Sheet Number Adjoining Map Sheets Diagram
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- Map Reading I Marginal Information 2 of 4 Special Notes Declination Diagram
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- Map Reading I Marginal Information 3 of 4 Scales Contour Interval Notes Grid Reference Box
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- Map Reading I Marginal Information 4 of 4 Unit Imprint Legend
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- Map Reading I Colors (x6) BLACK: Man-made features (Buildings, roads, grid-lines) RED-BROWN: cultural features (contour lines) BLUE: Water features (Lakes, swamps and rivers) BROWN: Relief features and elevation on older or red-light readable maps (contour lines and cultivated land) GREEN: Vegetation (forest, woods, brush, orchards) RED: Man-made features (populated areas, major highway roads, boundaries on older maps)
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- Map Reading I Contour Lines & Interval 1. Check contour interval 2. Find given elevation 3. Determine direction of slope 4. Count contour intervals. Change in ELEVATION
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- Map Reading I Contour Lines & Interval GENTLE Lines that are farther apart (interval) = GENTLE SLOPE
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- Map Reading I Contour Lines & Interval STEEP Lines that are close together (interval) = STEEP SLOPE
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- Map Reading I Major Terrain Features (x 5) 1. Hill. 2. Valley. 3. Ridge. 4. Saddle. 5. Depression. H idden V alley R anch S alad D ressing
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- Map Reading I Hill: An area of high ground - Concentric circles. The center of the smallest circle is the hilltop. Major Terrain Features 1 of 5
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- Map Reading I Major Terrain Features 3 of 5 Valley: a stretched out groove in the land, usually formed by streams or rivers. - U or V shaped contour lines. High ground on 3 sides usually with water flowing in the middle. V or U points upstream.
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- Map Reading I Major Terrain Features 4 of 5 Ridge: This is a sloping line of high ground. - low ground in three directions and high ground in one direction. Contour lines tend to be U shaped or V shaped. The closed end of the contour line points to lower ground
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- Map Reading I Major Terrain Features 2 of 5 Saddle: Low point between 2 areas of high ground - hour glass or figure eight contour lines. X
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- Map Reading I Major Terrain Features 5 of 5 Depression: This is a low point in the ground. - Low ground or sink hole. Closed contour lines that have tick marks pointing toward low ground.
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- Map Reading I Minor Terrain Features (x 3) 1. Draw. 2. Spur. 3. Cliff.
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- Map Reading I Minor Terrain Features 1 of 3 Draw: a less developed stream course than a valley. There is essentially no level ground. - contour lines depicting a draw are U shaped or V shaped, - pointing toward high ground.
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- Map Reading I Minor Terrain Features 2 of 3 Spur: a short, continuous sloping line of higher ground, normally jutting out from the side of a ridge. - Contour lines depict the U or V pointing away from high - ground.
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- Map Reading I Minor Terrain Features 3 of 3 Cliff: a vertical or near vertical feature. - Contour line converge together into one Carrying contour. The last contour has tick marks pointing towards low ground. Sometimes depicted by contours running very close or touching.
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- Map Reading I Supplementary Terrain Features (x 2) 1. Cut. 2. Fill.
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- Map Reading I Supplementary Terrain Features Cut or Fill: a man made feature resulting from cutting through high ground or filling low ground. - Contour line extends the length of the cut (tick marks point to roadbed) and fill (tick marks point away from roadbed).
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- Map Reading I Practical Exercise 188.8.131.52.5. 184.108.40.206.10. 8 6 6 9
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- Map Reading I Practical Exercise Key 1.HILL2.VALLEY3. RIDGE4. SADDLE5. DEPRESSION 6. DRAW7. SPUR8. CLIFF9. CUT10. FILL
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- Map Reading I Summary Purpose Marginal Information Colors (x6) Terrain Features Major Minor Supplementary
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- Map Reading I Conclusion Knowing how to read and understand maps are valuable skills that can strengthen your awareness, credibility as a leader, and help you standout among your peers.
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- Map Reading I Introduction to Map Reading GRC JROTC COL. ALEXANDER
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