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Tier 2 Training. Projection/ArcCatalog. We start off with Projection !. Projection in a few sentences. A map projection is a method of showing the 3-D planet Earth on a 2-D plane, (inevitably causing distortions). The distortion can occur in distance, area, shape, or direction.

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tier 2 training

Tier 2 Training

Projection/ArcCatalog

slide3

Projection in a few sentences

  • A map projection is a method of showing the 3-D planet Earth on a 2-D plane, (inevitably causing distortions).
  • The distortion can occur in distance, area, shape, or direction.
  • Each projection will result in different types and amounts of distortion.
slide4

Coordinate System

  • After projecting 3-D planet to a 2-D plane, it must have an X and Y coordinate to know where features are.
  • UTM and BC Albers has its own x and y coordinate system.
  • Longitude and Latitude does not need a projection to identify it’s feature location.

iMapBC

  • iMap can show all 3 coordinates at the same time of the same location.
slide5

Which projection/coordinate system do you use ?

  • There are 3 common type you will be working on:
  • BC Albers
  • UTM
  • Geographic (Longitude, Latitude)
slide7

BC Albers

No Zone? It’s the whole BC

slide8

Things to Remember

  • BC Albers is one set of coordinates with zero area distortion for any part of BC (only BC).
  • UTM are in different zones. If a GIS data is in UTM 10, and you change it to UTM 11, the data will therefore, fly off somewhere else.
  • Longitude and Latitude must be in decimals and not in degrees for ArcGIS to recognize the coordinates. Use a longitude to latitude, degree to decimal conversion website, e.g.
  • http://www.fcc.gov/mb/audio/bickel/DDDMMSS-decimal.html
  • The best choice, if possible, is the BC Albers projection.
slide12

ArcCatalog

  • Allows you to connect data to both ArcCatalog/ArcMap (Important)
  • These data can be in your network drive or external connection (LRDW)
  • Create GIS formats from scratch
  • View some GIS formats as one file, not many (ex. Shapefile)
  • GIS data management
  • Preview spatial data/tables with basic tools (zoom in, zoom out .etc)
  • Allows you to search/filter items inside your directory (Important)
  • Open and run Arctoolbox
  • Add extensions
  • Setup Metadata
slide16

Projection Data Paths

BC Albers

Projected Coordinate Systems/National Grids/Canada/NAD 1983 BC Environment Albers.prj

UTM 10

Projected Coordinate Systems/Utm/Nad1983/NAD 1983 UTM Zone 10N.prj

You will remember these paths soon enough!!!