I have recently discovered QGIS and have been hoping to find a solution for converting bacthes of xy coordinates between two projection systems for our mapping system. I have known good coordinates for both datums that I am trying to convert between, but even though I believe I'm doing the right steps in QGIS, my coordinates are still out by a small margin.
Prior to finding QGIS, for single coordinate conversion I have been using the free Java-based Coordinate and Data Transformations tool that is available on the internet from Charles L. Taylor. I've attached an image of the two known coordinates from this tool.
I've provided the text data of my coordinates.
Original coords in NAD83/WGS84 Zone 14N (EPSG:4326)
Lat/Long: 49.362977,-101-742026 UTMs: x 300914.226, y 5471423.864
Converted coords in NAD27 Zone 13N (EPSG:26713)
Lat/Long: 49.362924,-101.741634 UTMs: 736577.110,5472689.933
I had imported my list of coordinates (original datum is NAD83/WGS84) into QGIS to get my list of points. After adding the corresponding UTM coordinates using the Export/Add Geometry function, I can see that the UTMs in the attribute table are the same as my original .csv file.
After conversion to what I thought was NAD27-Z13 using QGIS, my first coordinate comes back with the following coordinates:
Lat/Long: 49.36297733,-101.74205733 UTMs: 736548.431,5472694.612
When I plot the above coordinate on the map I have with the known good points already on the map, obviously they don't line up. What I'm wondering is if I'm missing a step or if there are options that must be set during conversion. From what I can tell of QGIS, if I can find a solution to this, it will make batch conversion between datums much quicker. Many of the coordinate files that I receive are in .csv format and QGIS seems like the perfect application for what I need, however, I'm hoping that someone that has more experience can point me in the right direction.