Tips for mapping fig4 comparison

[josephholler]

The data source for aes() can be wrapped in a factor function as such: aes( fill = factor( difference )) so that you can set up a manual classification.

Then use a scale_fill_manual() to set a unique color for each of your unique results.

If you want to select great colors for this classification, you can pick the HTML color hex codes from colorbrewer: https://colorbrewer2.org/

[mtango99]

Anyone else's map have the legend in the wrong order (-1, -2, 0, 1, 2)? Tried messing with "levels =" and "ordered()" but couldn't figure it out. edit: fixed it by just using Paint to switch the order in the png

[vinfalardeau]

I was having the same order issue, and in case anyone else is running into it, one workaround is to use scale_fill_manual() and set both limits (which takes care of the order) and values (which picks the colors). For instance:

map3 =ggplot() +
  geom_sf(data = ea,
          aes(fill = EA),
          color = NA) +
  geom_sf(
    data = fig4compare,
    aes(fill = factor(difference)),
    color = "white",
    lwd = .2
  ) + 
  scale_fill_manual(limits = c("-2","-1","0","1","2","Missing Data","Major Lakes of Malawi","National Parks and Reserves"), 
                    values = c("-2"="#e66101","-1"="#fdb863","0"="#cccccc","1"="#b2abd2","2"="#5e3c99","Missing Data"="#000000","Major Lakes of Malawi"="lightblue","National Parks and Reserves"="#D9EABB"))+
  scale_x_continuous(breaks = c(33,34,35,36)) +
  labs(title = "Title") +
  theme_minimal() +
  theme(legend.title = element_blank())
map3

[mtango99]

Thanks Vincent!

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From: vinfalardeau @.> Sent: Monday, April 26, 2021 3:20:55 PM To: GIS4DEV/GIS4DEV.github.io @.> Cc: Tango, Maddie @.>; Comment @.> Subject: Re: [GIS4DEV/GIS4DEV.github.io] Tips for mapping fig4 comparison (#41)

I was having the same order issue, and in case anyone else is running into it, one workaround is to use scale_fill_manual() and set both limits (which takes care of the order) and values (which picks the colors). For instance:

map3 =ggplot() + geom_sf(data = ea, aes(fill = EA), color = NA) + geom_sf( data = fig4compare, aes(fill = factor(difference)), color = "white", lwd = .2 ) + scale_fill_manual(limits = c("-2","-1","0","1","2","Missing Data","Major Lakes of Malawi","National Parks and Reserves"), values = c("-2"="#e66101","-1"="#fdb863","0"="#cccccc","1"="#b2abd2","2"="#5e3c99","Missing Data"="#0","Major Lakes of Malawi"="lightblue","National Parks and Reserves"="#D9EABB"))+ scale_x_continuous(breaks = c(33,34,35,36)) + labs(title = "Title") + theme_minimal() + theme(legend.title = element_blank()) map3

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