Aligning data
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The main focus of this presentation is on coordinate systems. We describe common problems that people have, key terms , how to apply coordinate systems in 10.1 and best practices.

The main focus of this presentation is on coordinate systems. We describe common problems that people have, key terms , how to apply coordinate systems in 10.1 and best practices.

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Aligning data Presentation Transcript

  • 1. Aligning dataSabata Mcatshulwa
  • 2. Presentation Outline Common problems Coordinate Systems Geoprocessing Tools
  • 3. Presentation Outline Common problems Coordinate Systems Geoprocessing Tools
  • 4. Common Problems
  • 5. Common Problems
  • 6. Common Problems
  • 7. Demonstration
  • 8. Presentation Outline Common problems Coordinate Systems Geoprocessing Tools
  • 9. Coordinate SystemsGeographic Coordinate Systems• A measurement of a location on the Earth’s surface expressed in degrees of latitude and longitude
  • 10. Coordinate SystemsGeographic Coordinate Systems • Three-dimensional spherical surface to define locations on the earth • If two datasets are not referenced to the same geographic coordinate system, you may need to perform a geographic (datum) transformation • It is very important to correctly use a geographic transformation if it is required. • A GCS is often incorrectly called a datum, but a datum is only one part of a GCS. A GCS includes an angular unit of measure, a prime meridian, and a datum (based on a spheroid). • The spheroid defines the size and shape of the earth model, while the datum connects the spheroid to the earths surface
  • 11. Coordinate SystemsProjected Coordinate Systems • A method by which the curved surface of the earth is portrayed on a flat surface
  • 12. Coordinate SystemsProjected Coordinate Systems • Two-dimensional surface • locations are identified by x,y coordinates on a grid, with the origin at the center of the grid • Unlike a GCS, a PCS has constant lengths, angles, and areas across the two dimensions • A PCS is always based on a GCS that is based on a sphere or spheroid.
  • 13. Coordinate SystemsDatums• A frame of reference for measuring locations on the surface of the Earth • Cape (Port Elizabeth) • Hartebeesthoek 1994 (Hartrao) • WGS 1984 (Earth-centered = mass of the Earth)
  • 14. TM• Two degree zones (Transverse Mercator) • LO = TM x, Cape • WG = TM x, Hartebeesthoek
  • 15. Coordinate Systems• South Africa or a different area• Create a .prj file• Update the parameters
  • 16. Demonstration
  • 17. Presentation Outline Common problems Coordinate Systems Geoprocessing Tools
  • 18. Geoprocessing Tools• Vector • Define Projection = To assign a coordinate system • Project = Change a coordinate system• Raster • Raster Properties = To assign a coordinate system • Project Raster = Change a coordinate system
  • 19. Geoprocessing Tools − Spatial adjustment • Projections - Shift data between coordinate systems • Transformations - Shift data in coordinate space − Alignment tools • Bulk alignment Snap - snapping based on user specified rules Integrate – will make feature coincident within a tolerance • Interactive(New tools introduced at 10.1) Align Edge - snap edges together to close gaps Align to shape - adjust layers to traced shape Replace geometry - create an entire new shape for a feature
  • 20. Demonstration
  • 21. Discussion