Georeferencing an image with AutoCAD

In another post we talked about georeferencing scanned maps or Google Earth images, we saw how to do it With Manifold y With Microstation, in these entries you can see more details of how to get the Google Earth image, the utm coordinates and how to cut them.

Now let's see how to georeference the image with AutoCAD

1. Entering the coordinates

To enter the UTM coordinates in AutoCAD, it is done with the point command. (Drawing / point / multiple point)

Then enter the coordinates of this form:

From the command bar would be:

point, enter, coordinate, enter, coordinate, enter ... until you enter all of them.

The coordinate format is: "coordinate x" , "coordinate y", so that they would be

431512,1597077
431838,1597077
431511,1596838
431837,1596838

If the system does not accept them, it may be because the configuration of points management is not according to the format, so write on the command line PDMODE = 2

If you don't see the dots or they look very small, select format / point styles / and choose a more visible format.

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Entering the points should look like this:

Now what we must do is insert the image, this is done with “insert/image manager”

We click on the button “attach“, then the image is searched and you indicate that the insertion point and scale will activate it on the screen.

Then select the left corner, with the snap on the point, and the lower right.

Ready, the image is georeferenced to the specified coordinates.

2 How accurate are Google Earth data for cadastre?

Do not use this for serious work, because that does not serve GoogleEarth data. Previously we had talked about thePrecisions” that have the Google Earth data.