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.
The Layer to KML (Conversion) tool in ArcGIS converts the data to an image, which may be distorting when displayed at large scale. You could try increasing the DPI.
You can also export the data in vector format using the Export to KML tool. You may run into performance issues if the dataset is very large, but it should give much higher intrinsic quality.
For such conversion I often use the free and opensource tool ogr2ogr
An easy to use command line. A cheatsheet with must common command from Boston GIS
It would be something like: ogr2ogr "KML" output_filename.kml input_filename.shp
Maybe this conversion is more accurate. I hope it helps.