Hi ChicagoLooper,
Thank you for the attention and the answers. I'll try to answer both of them here, but first let me give you more information about the tools and data that I have, and what I'm trying to do:
* Tools : Autocad 2016, Google Earth, Google Map, and Excel. I don't have Map 3D or Civil 3D, and I have never used those programs.
* Data: I have and Excel file Lat/Lon (with 8 digits after the decimal point) and other data for pole locations. Here is a picture of the file and also with the link you can get a subset of the data (200 points):
https://drive.google.com/file/d/1iA2TY4onQtwqFZ5NjoGEVfaEopV5giCm/view?usp=sharing
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Also I have a dwg drawing of the city of Peabody (not georeferenced) shown in the picture below, that is the same you can see on this link: https://peabodyma.mapgeo.io/?latlng=42.532644%2C-70.973657&zoom=13
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* Goal: I need to plot the location of 9 thousand poles on the dwg file using the information (Lat/Lon) from the excel file. The poles should be represented as circles and have attributes, that's why I want to use blocks.
I plotted the poles in Google Earth and I got points with pretty good accurate for my purpose, as you can see below.
My idea to accomplish this has being:
1- Use Autocad>>Set Location>>From Map to georeference the dwg drawing and make it match Google Earth coordinate system.
2- Convert the Lat/Lon to UTM values and use those UTM's values to plot points in the georeference dwg drawing.
3- Use a script to insert blocks at the plotted points with attributes from the Excel file.
4- Use the projected bing map that Autocad places under the dwg drawing to draw some missing street and buildings
Is it possible to do this with Autocad 2016 alone, or do I need Map 3D or Civil 3D? Is the georeference done with Autocad>>Set Location>>From Map a good method?
Now to answer some of your recommendations:
* I used Lat/Lon with 6 decimal place to set the location of the marker in Autocad>>Set Location>>From Map window and I got the Lat/Lon for that point from Google Earth. So, I don't think that the problem that is causing the mismatch in the points is due to lack of precision in the Lat/Lon used for the marker.
* I increased the precision of the units in Autocad but that didn't improved the big difference when I plotted the Autocad's UTM coordinates for the test point in Google Earth.
* I still don't understand why when I change the coordinates in Autocad from UTM to Lat/Lon and I use the Lat/Lon of the test points in Google Earth I get almost a perfect match. It looks like the convertion from Lat/Lon to UTM that Autocad is making creates the difference. I don't know if I can input Lat/Lon in Autocad insted of UTM values.
* In the test that you did with the 5 points using Map 3D did you try to plot those points in Google Earth using the UTM values from Map 3D? Did they matched?
Thanks for you attention.
Poles in Google Earth
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