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Published byPriscilla Cain Modified over 9 years ago
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Paper Maps Review
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Georeferencing Process 1.Find the most specific named place. 2.Determine the coordinates and datum of the named place using orthogonal offsets (measured on map, converted to real-world distances) from known coordinates. 3.Determine the extent of the named place. 4.Determine map measurement error. 5.Determine Locality Type.
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Georeferencing Process 6.If Locality Type is “Distance only”, “Named place only”, or “Distance along path”… - enter the coordinates of the named place or click on the “Promote” button to copy the coordinates from your prior calculation. - select “Error only” Calculation Type - select the Locality Type - set all parameters on the Calculator - click on the “Calculate” button.
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Georeferencing Process 6.If Locality Type is “Distance at a heading” or “Distance along orthogonal directions”… - enter the coordinates of the named place or click on the “Promote” button to copy the coordinates from your prior calculation. - select “Coordinates and error” Calculation Type - select the Locality Type - set all parameters on the Calculator - click on the “Calculate” button.
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uMnyama river crossing NW Upper Gxulu 1) Find most specific named place
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2) Measure distances to named place 253.5 mm = 12.675 km N 183.5 mm = 9.175 km E uMnyama river crossing NW Upper Gxulu
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3) Determine extent of named place 4) Determine map measurement error.5 mm = 0.025 km
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Swamp 1.5 km S Tavistock 1.5 km 1) Find most specific named place
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Swamp 1.5 km S Tavistock 2) Measure distances to named place 89 mm = 4.45 km W 135 mm = 6.75 km S
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3) Determine extent of named place 4) Determine map measurement error 13 mm = 0.65 km Swamp 1.5 km S Tavistock
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Slope above excavation, Maqweni’s Hill, 900m 1) Find named place
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Slope above excavation, Maqweni’s Hill, 900m 1) Find most specific named place 900m
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Slope above excavation, Maqweni’s Hill, 900m 2) Measure distances to named place
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Slope above excavation, Maqweni’s Hill, 900m 1) Find most specific named place 17 mm =.85 km 3) Determine extent of named place 4) Determine map measurement error
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3 km NW mouth Soutrivier Kanaal 1) Find most specific named place
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3 km NW mouth Soutrivier Kanaal 2) Measure distances to named place 205 mm = 10.25 km N 51.5 mm = 2.575 km W
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3 km NW mouth Soutrivier Kanaal 2) Calculate coordinates of named place
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3 km NW mouth Soutrivier Kanaal 3) Determine extent of named place 4) Determine measurement error 1 mm = 0.05 km
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5) Determine Locality Type 6) Calculate “Offset at a heading” 3 km NW mouth Soutrivier Kanaal
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Double check!
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Final georeference 3 km NW mouth Soutrivier Kanaal
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