Rectifying manual تعليم لبرنامج global mapper

Export and Rectifying Google Earth image using Global Mapper

All right reserved to the author This manual prepared and designed by Youssef Hassan GIS specialist [email protected]

1. Open Google Earth pro and draw polygon for the area that you

want to export like this



2. On Google left window right click on the polygon and save as



3. Save file and for save as type choose kml then click save



4. Then click file/save/save image then choose premium resolution



5. Name your image and save as jpg format then click save.

And wait until save step is finish



6. Now you don’t need Google Earth again close it and open Global

Mapper software, click file/open data file and open kml file first.

7. Then click configuration tool to choose your projection



After you chossing your projection you can save it to file to be easly loaded again.



8. Then click ok after you choosing the projection, you will found

the program reader coordinates changed to the projection that

you selected.

9. Now you can click open to open the Image that you exported

from Google Earth, select your image then click open.



10. After you click open the programe will give you a massage

that your image didn’t have coordinates and will ask you if you

want to doing rectify so click yes to loggin to rectifying window.



11. The first step in rectifying is to select you projection

Choose UTM projection then click open then click ok.



12. Start your rectifying using the polygon in the right side and

add the 4 control points in the polygon corners with the polygon

drawing in the image like this,

Do this 4 times for the 4 polygon corners.



13. I think this figure explain what I meant in the previous

step.

This is the 4 control points that drawing above have (x, y) pixels, projected UTM

coordinates and lat, long coordinates. Then click Apply and Ok.



14. We will found that the image now have a coordinates and the final step is to export

this image as Geotiff.



15. Export image: File/export raster and elevation data/ export Geotiff.



Draw abox inside the polygon to be the exported area and to avoid appear of the white polygon on the image.

Then click ok



Then click ok in Geotiff export option window, then give it name and click save.

And wait until saving is finished, and now you have a georeference image and you can use it in Arc

programs or MapInfo or any other GIS program.



And now click file / Unload All and then click Open tool and select the Geotiff image and click open.

You will found it has the UTM projection coordinates,,,,,,,,,, Enjoy

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Rectifying manual تعليم لبرنامج global mapper