The easiest way to georeference a scanned map, as seen in the previous tutorial on georeferencing in QGIS, is to key in coordinates based on grid lines on the map. These grid lines have latitude and longitude values associated with them so you can simply drop control points at the intersecti...
Do yourself a favor and find the most suitable image possible. For example, if you want to georeference an aerial photo taken in 1920, you should use a reference image closest to that date for better control points. Once you find that reference image, it’s then a matter of finding match...
but they told me that the R is MapCellsReference, not georeference. When I use geotiffwrite function, it did not work. If I just used R directly like following: ThemeCopy geotiffwrite('~/rasters/MeanOct16th.tif',MeanOct16th,R); ...