I'm working on a soils map, the data for which I've collected with a EM38 (electrical conductivity) instrument. The resulting attribute table is quite large, but there is a single column, "X5", with the data (in milliSiemens) that I'm wanting to map. The area has 1000+ data points over 30 acres and I'd like to use either the kriging or IDW tools to interpolate the points into a even map.
My issue so far is that when I open up the kriging or IDW tools' window and select the layer with the EM data, the next drop down menu (I believe it's called the Z value?) does not include the X5 column; the drop down only lists columns such as latitude, longitude, date, time, etc. How can I add the X5 column to that drop down menu? Is this because of the type of field? I believe the X5 column is in String format.
Pardon my incorrect use of language, I don't have the window in front of me. But I hope you understand what I'm talking about!
Any suggestions would be much appreciated!!