Create a polygon in AutoCAD and send it to Google Earth

In this post we will do the following processes: Create a new file, import points from a total station file in Excel, create the polygon, assign it georeference, send it to Google Earth and bring the image of Google Earth to AutoCAD

Previously we saw some of these procedures on foot, in this case we will see how to do them with AutoCAD Civil 3D 2008 ... a clear example of how what has evolved at the time was Civil Sourvey (Softdesk / cogo) and AutoCAD Map; At this point the 2008 version of Civil 3D includes both, which allows to handle georeferences and a link with Google Earth.

To begin, a new file is created, using a metric units template.

1. Import points from Excel

This is the same as Softdesk did, with the advantage that the visualization capacity is simplified and improved. The file we have was raised with a total station, and from there we have exported it to comma separated text (csv) which is a format that Excel can open.

To bring the points is done "Points / import / import points” then we choose the format, in this case PNEZD (comma delimited), Which means that the points are in order: Point, Northing (Y coordinate), Easting (X coordinate), Elevation (Z coordinate) and Description.

Once entered, the points can be displayed in the left panel with its UTM coordinate.

2. Create the traverse

To create the polygon, we use the polyline (pline) command, and indicate that we want to draw it from the coordinates of the numbered points, for this we write in the command bar pn, Then enter.

Then the system asks us the range of points, and we write 1 108, that is from the first point to the 108 ... and ready, the traverse is drawn.

3. Create the parcel

So far we have no database, but a simple dwg.

To create the as plot we do “Parcels / create parcel from objects“. The panel that is displayed allows you to choose the table to which it will be associated, we will choose “property“, the centroid data will be stored in the layer “C-prop” and the boundary in “C-prop-line"

The panel also allows us to choose which text will be inserted into the plot, such as the associated centroid; we will choose the name of the plot, area and perimeter. Then we do "ok"

4. Assign projection

Now the coordinates we have need to be defined within a UTM zone (such as we did it With Manifold), which means to assign you system of projection and reference spheroid.

This is done with the right mouse button on drawing, then select “Edig drawing settings".

There we choose in the tab “Units and zone“, we choose metric units, and degrees as angular units (degrees). Then we assign the UTM zone, Civil 3D allows us to choose the country, in this case we assign “USA, Administration” because the plot is in Puerto Rico and then the Datum. In this case we assign WGS84, which would be NAD83 Puerto Rico.

5. Send it to Google Earth

To send it to Google Earth, we use the wizard that is activated in “file / publish to Google Earth".

In this panel you choose the description, coordinate system in case they have not been previously defined, name of the kmz file and once it is ready, the button “publish".

Once the kmz file has been created, it can be viewed in Google Earth with the “view"

6. Bring the Google Earth orthophoto to AutoCAD

We explained this In another post, but basically it is done by means of “file / import / import Google Earth image".

Conclusion:

Do not do with AutoCAD and Excel what AutoCAD Civil 3D does ... Of course, for that you have to Pay what it's worth, Although there are things that makes it more practical PlexEarth And always on AutoCAD

Vía: AUGI, Mexico, Central America and the Caribbean, you can see a video of this process if you register.