I am evaluating QGIS with a view to visualize and manage geological exploration data. The information is currently stored in different local coordinate systems that I am looking to overlay with satellite imagery from Google and Bing. I figured out how to load the data I want into QGIS, but I am struggling to find a way to convert them into a common coordinate system?
I presume I should use geographical coordinate system like WGS84. Is anyone can explain what tools are available for conversion from a local projected coordinate system (I believe it is a Mercator based projection) to latitude/longitude using few reference points where I have coordinates in both systems?
I tried to follow suggestion from here: How to georeference a vector layer with control points? and downloaded Affine Transformation Plugin. But I cannot figure out how to get the input parameters (scale, translation and rotation) without mastering coordinate projections theory. I have not tried v.transform that was also suggested as I could not see how to make it work for geographical coordinates.