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For the first part of your question: GDAL can guess the format of the input file from the file extension. The output format is defined by the -f option. If it is missing, Geotiff is assumed, but you get that warning if the file extension is not .tif. For a .grd output, you can select between GS7BG (rw+v): Golden Software 7 Binary Grid (.grd) GSAG (rwv): ...


NAD1983 is a geographic coordinate system. There are a few different ways you could go about aligning these data, but I'll give an example that I think is simple and clean. (1) Add both of your CSV tables to ArcMap and plot the points. Make sure you plot them using the correct geographic coordinate system - File1(NAD1927) and File2(NAD1983). Right click the ...

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