Strange behavior on ggplot2

Question

I'm trying to do a map to identify specific areas by coloring them. First, I made this plot to check if the data was ok (Setor is the sector's number):

ggplot(aes(x = long, y = lat, fill = Setor), data = mapa2010) + geom_polygon(colour = 'black') # data is ok

Them I tried to made the plot, filling by another variable (AGSN):

ggplot(aes(x = long, y = lat, fill = AGSN), data = mapa2010) + geom_polygon(colour = 'black')

The data is exactly the same, there is no code lines between this 2 commands. I've already tried to reorder the data, but still wrong.

Anyone know why this happens, and how to solve it?

It's hard to do reproducible example because I don't know why this happens (to recreate in the example), and the original data is big — Rcoster
– Rcoster, Commented Oct 8, 2015 at 16:52
Looks like rows in your data frame got re-ordered (mis-ordered). — Gregor Thomas
– Gregor Thomas, Commented Oct 8, 2015 at 17:13
@Gregor: I agree with you. But why this happens? I tried sort the data by: AGSN, id, piece and order, but didn't changed anything. — Rcoster
– Rcoster, Commented Oct 8, 2015 at 17:59
Do you have missing values in AGSN? If so you probably got a warning with your plot, but that could do it... — Gregor Thomas
– Gregor Thomas, Commented Oct 8, 2015 at 18:03

Rcoster · Accepted Answer · 2015-10-08 18:16:09Z

1

Adding the parameter group = group in aes() for second plot solve. Don't know why only the second map needs.

ggplot(aes(x = long, y = lat, fill = AGSN, group = group), data = mapa2010[order(AGSN, id, piece, order), ]) + geom_polygon(colour = 'black')

answered Oct 8, 2015 at 18:16

Rcoster

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