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Georeferencing in arc gis on screen steps
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Georeferencing in arc gis on screen steps


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Nasir Hameed, Muzaffarabad Azad Kashmir

Nasir Hameed, Muzaffarabad Azad Kashmir

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  • 1. Georeferencing in ArcGISMultiple approachesNasir Hameed
  • 2. Add dataset to be georeferenced
  • 3. In this example NWFP mapis selected, else could be satellite image,Topo sheet, etc. the method will remain samefor other maps/images, if points are known.
  • 4. Right click on the location enables to view the toolbar .
  • 5. Add on fly projection, coordinate system beforestarting Georeferencing….. This technique will enable youto insert DMS in selected control points, xy coordinatesmay also be entered during Georeferencing operation afterConverting them from DMS …
  • 6. Follow the Path:- Predefined---geographic coordinate systems….world….WGS-1984
  • 7. Back to main window after selecting the on fly coordinate system….later onThe resultant rectified map could also be converted to Planner Coordinate Systems like UTM, etc.
  • 8. Now add known referenced points/coordinatesNo matter the image is saved from Google or somewhere else,coordinates should be known in order to Georeferencing. If this is notthe case then image could still be referenced throgh another rectified/georeferenced image .
  • 9. Encircled locations of the map are selected for entering known coordinates in DMS
  • 10. Left & then right click ..
  • 11. Dialogue box allows to enter coordinates
  • 12. Move towards next point….
  • 13. All encircled points were entered with DMS.‘Rectify’ allows you to save the rectified image to desire location, format .
  • 14. Browse for location to save the output file.Tiff format is used for its capabilityEmbed Georef information.
  • 15. The operation is now completed, remove the image in order to insert rectified image.From where it was saved!!
  • 16. Insert the image from where it was saved ….the rectified one!
  • 17. It is now rectified, its showing coordinates wherever you surface the map….The map is ready to be work on it…
  • 18. The coordinate system of the resultant rectified imageCould be converted to projected coordinate system like UTM, LCCin order to have area, length etc.
  • 19. Follow the path:Pre Defined… projected coordinate system…..UTM…..WGS1984…….Northern hemisphere…..WGS1984 UTM zone 42 North
  • 20. Now meters are shown in the lower corner of the map,
  • 21. Changing coordinate system of image, vector filefrom other sources!!Coordinate system can be applied to the map fromArc Catalog and from “tool box” .
  • 22. This tool works only when coordinate system is notdefined during Georeferencing or image is notalready assigned coordinate system.You may open this tool before starting Georeferencing asalternate of “on fly projection”.
  • 23. Launch the application.
  • 24. Here is our map
  • 25. Follow the path:Pre Defined… projected coordinate system…..UTM…..WGS1984…….Northern hemisphere…... WGS1984 UTM zone 42 North