I Just Want To See Vuginnas

Contour + Autocad Civil 3D 2008 + Google Earth

Below carried out, a detailed explanation of obtaining contours from Google Earth using the AutoCAD Civil 3D 2008. Are some simple steps and is really a useful tool for those who are dedicated to sciences related to cartography. Before starting I recommend reading these restrictions of the method.

- It is true that we can get contours at each meter from Google Earth, but never this approximation by interpolating triangular topography resembled a field.

- You can use in studies at the profile or in obtaining results where the metro areas and lengths are expressed in large scales (km or km2).

- adjustment and correction of the curves obtained depends largely on the knowledge in the field, recommended compared with topographic surveys conducted in the field near the project area.

- Better to use it in areas of rugged canyon and mountainous topography. In flat areas or other outlets, the curves require a tighter fit even to be unrealistic

Let's begin:

1. The image of Google Earth should have a maximum height of 8 to 10 km, this can be seen at the bottom right.

2.The 3D Autocad 2008, open the template NCSLDT (Metric), once you open the template is saved as a "dwg" in any version.

3. In Google Earth, located approximately in the center of the image the coordinates of reference point, of course, before doing this you should check the configuration of the UTM and geographic area in Google Earth. Here we work with the WGS 84 Zone 18SUR. Take note of that because that will serve to coordinate the insertion of the image in Autocad.

4. The 3D Autocad 2008, go to File - Import - Image / Surface
Google

5. Enter the coordinates, we note, indicate a rotation of zero degrees and go! create the surface containing the DEM and other properties of the image extracted from Google Earth.

6. To obtain the level of interpolation of the curves, just enter: Surfaces - Utilities - Extract Objects from Surface. In this case we work with curves to each elevation 2m

7. Final result of the area to work. For other editions of these curves can be grouped in blocks and so able to georeference, giving scale values \u200b\u200bbased on any survey in this area you have.