Georeferencing   where on earth are we

Georeferencing where on earth are we PowerPoint PPT Presentation


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How do we make sure all our data layers line up ? Georeferencing: = linking a layer or dataset with spatial coordinates Registration:

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Georeferencing where on earth are we

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1. Georeferencing – where on earth are we ?

2. How do we make sure all our data layers line up ? Georeferencing: = linking a layer or dataset with spatial coordinates Registration:   = lining up layers with each other

6. The NAD shift (do we still need this slide?)

7. Geographic referencing (latitude/longitude)

9. The main problem with geographic referencing (for GIS data display and analysis)

12. Universal Transverse Mercator (UTM) System

13. Canada: UTM zones

14. Coordinates within each zone UTM coordinates – in metres Northings (N): from the Equator – increase to the pole (10,000,000m) so …a location with northing: 5,900,000 is 5,900 km north of the equator

15. UTM coordinates – in metres this is the hardest part … Eastings (E) – based on the zone Central Meridian at 500,000 a ‘false easting’

16. Topographic map with Geographic and UTM referencing and zone overlap

18. Albers (conic) projection - an option to avoid multiple UTM zones

20. BC Albers projection

22. GIS software project define and reproject

24. Summary: BC mapping coordinates

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