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Nowosad committed Sep 30, 2024
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Expand Up @@ -1112,11 +1112,11 @@ It is typically used in mapping polar regions.

A quick summary of different projections, their types, properties, and suitability can be found at [www.geo-projections.com](https://www.geo-projections.com/).
We will expand on CRSs and explain how to project from one CRS to another in Chapter \@ref(reproj-geo-data).
For now, it is sufficient to know that:
For now, it is sufficient to know:

- Coordinate systems are a key component of geographic objects
- Knowing which CRS your data is in, and whether it is in geographic (lon/lat) or projected (typically meters), is important and has consequences for how R handles spatial and geometry operations
- CRSs of `sf` objects can be queried with the function `st_crs()` and CRSs of `terra` objects can be queried with the function `crs()`
- That coordinate systems are a key component of geographic objects
- Which CRS your data is in, and whether it is in geographic (lon/lat) or projected (typically meters), is important and has consequences for how R handles spatial and geometry operations
- That CRSs of `sf` objects can be queried with the function `st_crs()` and CRSs of `terra` objects can be queried with the function `crs()`

```{r vector-crs, echo=FALSE, fig.cap="Examples of geographic (WGS 84; left) and projected (NAD83 / UTM zone 12N; right) coordinate systems for a vector data type.", message=FALSE, fig.asp=0.56, fig.scap="Examples of geographic and projected CRSs (vector data)."}
# source("https://github.com/geocompx/geocompr/raw/main/code/02-vector-crs.R")
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