data-lessons / neon-r-make-pretty-maps-plots Goto Github PK

See README.md for attempts so far in getting to work.

Hey @bbest @megwilliams @kwiter -- did any of you work on creating a map (or have you done this) where you have a shapefile (eg the roads_streams lines shapefile in our data ), and you create a map with the lines colored by category. IN essence "TYPE" or an attribute becomes a factor. We have the following below which seems a bit cumbersome but works. We are using the roads_streams shapefile.

I am not sure how to add a legend or to make a nice categorical plot. Is there a simple way to do and teach this?

Thanks for any ideas!

#color lines by TYPE attribute
type <- slot(object = lines, name = "data")$TYPE
#you can also write
type <- lines@data$TYPE

col <- rep(x= "black", length = length(type))
col[type == "footpath"] <- "red"

plot(x=lines, col=col,add=T)

Here is the latest version of the lesson that i'm working on

https://github.com/data-lessons/NEON-R-Spatial-Vector/blob/gh-pages/00-open-a-shapefile.Rmd

This issue is related to #4
where some interactive components don't render properly via jekyll. we might need to consider a local build option.

"You might consider opening a separate issue that tries to reconcile bringing these lessons together into a single site, factoring in this closed issue as a factor for consideration (if you want to include htmlwidgets) and one possibility to generate output (ie by skipping use of Jekyll and opting for simpler rendering methods like brew and Makefile)."