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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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