[R-sig-Geo] Reverse y-axis with geom_sf

[Jesús]

Hi Kent
Did you try using the coord_flip function from ggplot?
Cheers
Jesús


El mar., 19 mar. 2019 a las 13:55, Kent Johnson (<kent3737 using gmail.com>)
escribió:

> Hi,
>
> I am working with data representing cells in a tissue sample with lines and
> polygonal regions defined in the same space. The cells and polygons are
> represented and manipulated as simple features objects and visualized using
> ggplot2 and geom_sf. Mostly this works very well. The problem is that the
> coordinate system of my data has the origin at the top left corner. For
> data with no CRS, geom_sf puts the origin at the bottom left so all my
> plots are inverted.
>
> Is there a way to invert the y axis while staying within sf (or possibly
> sp?) The only answers I have found involve extracting the coordinates from
> the sf objects and inverting or plotting from the raw data. Maybe by
> creating a CRS with the correct orientation?
>
> For a very simple example with just a few vectors - the code below plots an
> arrow pointing down; I would like to invert the y-axis so it points up.
> library(sf)
> library(ggplot2)
> s1 <- rbind(c(9, 11), c(10, 10))
> s2 <- rbind(c(11, 11), c(10, 10))
> s3 <- rbind(c(10,14), c(10, 12), c(10,10))
> mls <- st_multilinestring(list(s1,s2,s3))
>
> ggplot(mls) + geom_sf()
>
> Thank you for any help,
> Kent Johnson
>
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-- 
Jesús

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