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Explain coordinate system mismatch #491

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Aug 14, 2025
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Explain coordinate system mismatch #491

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9 changes: 9 additions & 0 deletions episodes/06-vector-open-shapefile-in-r.Rmd
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Expand Up @@ -172,6 +172,15 @@ ggplot() +
coord_sf()
```


On the boundary plot, the x and y axes are labeled in units of decimal degrees. However, the CRS
for `aoi_boundary_HARV` is UTM zone 18N, which has units of meters. `geom_sf` will use
the CRS of the data to set the CRS for the plot, so why is there a mismatch?

By default, `coord_sf()` generates a graticule with a CRS of WGS 84 (where the units
are decimal degrees), and this sets our axis labels. To draw the graticule in the native
CRS of our shapefile, we can set `datum=NULL` in the `coord_sf()` function.

::::::::::::::::::::::::::::::::::::::: challenge

## Challenge: Import Line and Point Vector Layers
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