Hi I was wondering if QGIS could be used in a slightly different way. I do EMPA ( Electron probe micro-analyzer ) of microscope slides. When it is in the device I can note down x,y,z co-ordinates when taking a photo or doing a sample analysis. The problem is when you remove the slide and put it back in again these previous x,y and z components are now meaningless because the device that holds the slide is not accurate enough to achieve the same positioning again. I was thinking that if I had known reference points on the slide I could "geo-reference" all pictures and scans I did for a specific session and then when I have follow up photos and point analysis data, taken in a separate session, I could "geo-reference these and use QGIS to map out all the photos and pin point analysis as different layers making it very easy to correlate data. As long as I have the co-ordinates I should then be able to add any other microscope ( eg. petrographic images ) data as a separate layer and match it up.
If I could get it working I could also write a plugin that could tell me co-ordinates of a point on the "map" based on the new x,y co-ordinates when I re-insert the microscope slide. Just in case it is not clear let me explain: When I insert a slide into the EMPA machine a certain spot will have co-ordinates of 255,234,40. When I re-insert the slide it might now have co-ordinates of 100,2000,80. However it is still the same point but because I am measuring in nano meters small changes can make big differences. My question is thus, does this sound possible and have anyone else done something similar? The area being mapped is actually flat and I am not sure if that would make a difference. Regards -- Gerhardus Geldenhuis
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