How to improve the precision of KML files on Google Maps?

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I am adding kml file to the google maps (api v3). Now the problem is that on google earth and google maps the accuracy of my kml decreases to kilometers. I am designing constituency boundaries and i need that to be accurate. Files are properly rectified, projected to WGS1984. In ArcGIS they give proper locations but when i plot their kml, it somehow is not that accurate. In addition, I am unable to go with point data in kml files. I mean they do not show the points neither go to its location.



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