Paper Maps Review

Georeferencing Process1. Find the most specific named place.

2. Determine the coordinates and datumof 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.

Georeferencing Process6. 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.

Georeferencing Process6. 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.

uMnyama river crossing NW Upper Gxulu

1) Find most specific named place

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

uMnyama river crossing NW Upper Gxulu

3) Determine extent of named place4) Determine map measurement error

.5 mm = 0.025 km

Swamp 1.5 km S Tavistock

1.5 km

1) Find most specific named place

Swamp 1.5 km S Tavistock

2) Measure distances to named place

89 mm = 4.45 km W

135 mm= 6.75 km S

3) Determine extent of named place4) Determine map measurement error

13 mm = 0.65 km

Swamp 1.5 km S Tavistock

Slope above excavation, Maqweni’s Hill, 900m

1) Find named place

Slope above excavation, Maqweni’s Hill, 900m

1) Find most specific named place

900m

Slope above excavation, Maqweni’s Hill, 900m

2) Measure distances to named place

Slope above excavation, Maqweni’s Hill, 900m

1) Find most specific named place

17 mm = .85 km

3) Determine extent of named place4) Determine map measurement error

3 km NW mouth Soutrivier Kanaal

1) Find most specific named place

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

3 km NW mouth Soutrivier Kanaal

2) Calculate coordinates of named place

3 km NW mouth Soutrivier Kanaal

3) Determine extent of named place4) Determine measurement error

1 mm = 0.05 km

5) Determine Locality Type

6) Calculate“Offset at a heading”

3 km NW mouth Soutrivier Kanaal

Double check!

Final georeference

3 km NW mouth Soutrivier Kanaal