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copied!<p>So, your data set has some nice column names, like "decimal_long" and "decimal_lat". When you have those, you want to use those as column names, not the default names like "V37" and "V39".</p> <p>To get those default names, I'm guessing you read your data in without a header, when in fact it has one:</p> <pre><code>plotdata <- read.table("WellDownload.txt", sep = "\t", header = T) ## To keep it simple, I'm going to keep only those two columns, ## and only the first 100 rows. plotdata <- plotdata[1:100, c("neg_decimal_lat", "decimal_long")] # Then the rest works just fine. #getmap library(ggplot2) library(ggmap) testmap <- get_googlemap(c(lon=135,lat=-32) ,zoom=6, xlim=c(127,142), ylim=c(-23,-34)) #plotting ggmap(testmap) + geom_point(aes(x= decimal_long, y=neg_decimal_lat), data=plotdata, colour="red", size=3) </code></pre> <p>And it works!</p> <p><img src="https://i.stack.imgur.com/S2nrZ.png" alt="enter image description here"></p> <p>There may be other problems in your data. When I read it in, I got warnings:</p> <pre><code>Warning messages: 1: In scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings, : EOF within quoted string 2: In scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings, : number of items read is not a multiple of the number of columns </code></pre> <p>It sounds like the data file has unmatched quotation marks. When I tried to look at the tail of the file, my R session crashed. I'd suggest opening it in a spreadsheet and cleaning it a little before putting it into R.</p>

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