I have a shapefile that contains data of a country from the following Geographic Coordinate System ( GCS_North_American_1927 aka NAD27 )
contents from the shape file .prj: GEOGCS["GCS_North_American_1927",DATUM["D_North_American_1927",SPHEROID["Clarke_1866",6378206.4,294.9786982]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
I have the following questions regarding this data.
1.) When i load this shapefile into SQL server in NAD27 Geographic coordinate system and also convert it to WGS 84 and load it into sql server. When i render both on google maps they look as if they overlap perfectly. Is this because google doesn't have the precision to go out to the proper decimal places to render the spatial data?
NOTE: Google maps assumes you will give it WGS 84 spatial data to work with.
2.) Are Transformations lossy? for example if i perform the following transformation
NAD27 -> WGS 84 and then go back WGS -> NAD27
do i get the same exact spatial information back or is some precision lost?
3.) If i transform my information from NAD27 to WGS84 to be displayed on google maps will my coordinate alway show the right position of the spatial data relative to WGS84 or will it be slightly off?