I am querying out spatial information from a SQL database that stores locations that users input on a map as GML snippets. See below for an example:
<gml:Point xmlns:gml="http://www.opengis.net/gml"> <gml:coordinates>-7823471.2337636035,5113510.302636641</gml:coordinates> </gml:Point>
This coordinate format is not familiar to me and I would like to be able to convert the coordinates to WGS84 but I will need the original spatial reference system EPSG which is not a part of the snippet.
I have access to ESRI shapefiles that our system generates for us so that we can view this data in ArcMap. I am able to see what these coordinates are in WGS84 Lat/Long by looking at those shapefiles, but I have no information indicating how the shapefiles are created from the original coordinates and our contract with the vendor who built the system has long expired.
Given that I am able to see their WGS84 Lat/Long equivalent, how might I go about determining the original spatial reference system so that I can convert the coordinates from the mystery system in the GML snippets to WGS84?
The shapefiles I have are only a small recent subset of the entire data set. I am seeking the spatial reference system of the GML snippet coordinates so that I can convert them into WGS84 for every record in the database (12,000 + records).