Workin in QGIS, I have a shapefile called "protected areas" of Dominican Republic, that was digitized from topomaps 50k. Shapefile is projected to WGS84, 19N zone. My problem is that when I load openlayers, the limits of almost all protected areas, don't get aligned with openlayers. In the following image there is an example:
The limit of the protected area (in red) is the coastline; but the real coastline plotted in Openlayers (google satellite) doesn't align with my shapefile (this area has rocky coastline, that haven't changed since topo was made). There is a ca. 45m shift in the X axis, and ca. 50m in the Y axis. In the following image:
the limit of the protected area is prefectly aligned with topomap (coastline, road, etc.). As I know, OpenLayers is projected using "Web Mercator". So, do I need to define a new CRS with transformation parameters between WGS84 19N and Web Mercator? I believed they use the same ellipsoidal reference, so I shouldn't need to define a transformation.
Any help would be appreciated.