One of the members of the GEC – Google Earth Community named Sgrillo (his id is ‘rsgrillo’ at GEC), has posted two freeware applications (Windows) he has been developing for Google Earth. Sgrillo is from Ilheus, Bahia, Brazil.
The first application is called GE-Path and as you might guess allows you to draw paths and save them as KML files for sharing with other GE – Google Earth users. But, this application also lets you draw polygons, calculate areas, measure distances, and he has added a number of export options such as Excel, and comma delimited text files. The paths (or polygons) are created by placing placemarks in GE and then importing the resulting KML into GE-Path.
The second application, GE-Graph similarly allows you to put data in placemarks and it will create bar graphs. You can set graph values, colors, scales, and labels. It also supports importing and exporting options.
To download these two applications go the the web site which has more details and screenshots. You can see an example KML of GE-Graph 
here. Great work Sgrillo!
About Frank Taylor
Frank Taylor started the Google Earth Blog in July, 2005 shortly after Google Earth was first released. He has worked with 3D computer graphics and VR for many years and was very impressed with this exciting product. Frank completed a 5.5 year circumnavigation of the earth by sailboat in June 2015 which you can read about at Tahina Expedition, and is a licensed pilot, backpacker, diver, and photographer.
When it comes to be able to make more various graphs, it is good. I think it is interesting this provides the function like in Google Earth Plus, because it provides the ability to create paths using the PlaceMark function, etc.
GE-Path and GE-Graph were update recently to be compatible with GE4. GE-Graph have now much more options of graphs, including irregular polygons (state/province borders, etc); custom color scale, etc.
How do I change a polygon to a path? I spent 8 hours over a number of days plotting a path circling the island of Guam. When I completed the path back to my starting point the start and end points closed and created a polygon. Now I am no longer able to tour the path that I worked so hard on creating. How do I change the polygon that Google Earth created back to a path?
Anyone…???
I have the same problem, my path changed spontaniously into a polygon, and now I cannot undo this change, just have to start all over again. (A half marathon from 21,1 km)
I searched in all available help-docs, but nothing about this strange bug.