[7]{.chapter-number}  [Interactive maps]{.chapter-title}

7 Interactive maps

You can plot a static map using plof(sf), but you can also create interactive maps.

Code

library(sf)
TRIPSgeo = st_read("data/TRIPSgeo.gpkg")

Reading layer `TRIPSgeo' from data source 
  `/home/rosa/GIS/EITcourse/data/TRIPSgeo.gpkg' using driver `GPKG'
Simple feature collection with 18 features and 7 fields
Geometry type: MULTIPOLYGON
Dimension:     XY
Bounding box:  xmin: -9.500527 ymin: 38.40907 xmax: -8.490972 ymax: 39.06472
Geodetic CRS:  WGS 84

Code

plot(TRIPSgeo)

Interactive maps are useful to explore the data, as you can zoom in and out, and click on the points to see the data associated with them.

There are several R packages to create interactive maps. For instance, the tmap package, the leaflet package, and the mapview package.

7.1 Mapview

Mapview allows to create quick interactive maps, only by declaring the function mapview().

Code

library(mapview)
mapview(TRIPSgeo)

To color the points by a variable, you can use the zcol argument.

Code

mapview(TRIPSgeo, zcol = "Total")

As you can see, a color palette is automatically assigned to the continuous variable.

Try to use a categorical variable.

Code

mapview(TRIPSgeo, zcol = "Municipality", alpha.regions = 0.4) # also add transparency)

Note that you can change the basemap, and click on the geometries to see the data associated with them.

You can go crazy with all the options that mapview offers. Please refer to the documentation to see all the options.

7.1.1 Export

You can directly export the map as an html file or image, using the Viewer panel.

This is the most straightforward solution.

You can also export a map as an html file or image using code.

Code

# install.packages("webshot2") # you will need this

map = mapview(TRIPSgeo, zcol = "Total") # fisrt create a objet with the desired map

mapshot2(map, "data/map.html") # as webpage
mapshot2(map, file = "data/map.png") # as image

7.2 Rmarkdown

To include a map on a report, website, paper (any type), you can create an Rmarkdown file.

And include a R code chunk (ctrl + alt + i) with a map. If the output is html, you will get an interactive map on your document!

--- format: pdf: prefer-html: true --- # Interactive maps You can plot a static map using `plof(sf)`, but you can also create interactive maps. ```{r} #| eval: false #| include: false # data preparation library(sf) TRIPSgeo_mun = st_read("https://github.com/U-Shift/MQAT/raw/main/geo/TRIPSgeo_mun.gpkg") TRIPSgeo = TRIPSgeo_mun |> rename(Municipality = "Concelho") |> st_set_geometry("geometry") st_write(TRIPSgeo, "data/TRIPSgeo.gpkg", delete_dsn = TRUE) ``` ```{r} #| message: false library(sf) TRIPSgeo = st_read("data/TRIPSgeo.gpkg") plot(TRIPSgeo) ``` Interactive maps are useful to explore the data, as you can zoom in and out, and click on the points to see the data associated with them. There are several R packages to create interactive maps. For instance, the `tmap` package, the `leaflet` package, and the `mapview` package. ## Mapview Mapview allows to create quick interactive maps, only by declaring the function `mapview()`. ```{r} #| fig-format: png library(mapview) mapview(TRIPSgeo) ``` To color the points by a variable, you can use the `zcol` argument. ```{r} #| fig-format: png mapview(TRIPSgeo, zcol = "Total") ``` As you can see, a color palette is automatically assigned to the **continuous variable**. Try to use a **categorical variable**. ```{r} #| eval: false #| code-fold: true mapview(TRIPSgeo, zcol = "Municipality", alpha.regions = 0.4) # also add transparency) ``` ::: {.callout-note appearance="simple"} Note that you can change the **basemap**, and click on the geometries to **see the data** associated with them. ::: ![](images/clipboard-3307189144.png){width="540"} You can go crazy with all the options that `mapview` offers. Please refer to the [documentation](https://r-spatial.github.io/mapview/articles/mapview_02-advanced.html) to see all the options. ### Export You can directly export the map as an `html` file or image, using the Viewer panel. ![](images/clipboard-3542861620.png){width="470"} ::: {.callout-warning appearance="minimal" icon="false"} This is the most straightforward solution. ::: You can also export a map as an html file or image using code. ```{r} #| eval: false # install.packages("webshot2") # you will need this map = mapview(TRIPSgeo, zcol = "Total") # fisrt create a objet with the desired map mapshot2(map, "data/map.html") # as webpage mapshot2(map, file = "data/map.png") # as image ``` ## Rmarkdown To include a map on a report, website, paper (any type), you can create an Rmarkdown file. ![](images/clipboard-1842640045.png){width="388"} And include a R code chunk (`ctrl + alt + i`) with a map. If the output is html, you will get an interactive map on your document!