### Install Development Version of osmextract

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Installs the latest development version of the 'osmextract' package from GitHub. Requires the 'remotes' package.

```r
# install.packages("remotes")
remotes::install_github("ropensci/osmextract")
```

--------------------------------

### Download England Cycleways with osmextract (efficiently)

Source: https://github.com/ropensci/osmextract/blob/master/README.md

This example shows how to download cycleways in England using the osmextract package. It is designed for large datasets and converts data to the efficient GPKG format.

```r
library(osmextract)

cycleways_england = oe_get(
  "England",
  quiet = FALSE,
  query = "SELECT * FROM 'lines' WHERE highway = 'cycleway'"
)
par(mar = rep(0.1, 4))
plot(sf::st_geometry(cycleways_england))
```

--------------------------------

### Program Copyright and License Notice

Source: https://github.com/ropensci/osmextract/blob/master/LICENSE.md

Include this notice at the start of each source file to state the copyright and license terms. It specifies redistribution rights under the GNU GPL version 3 or later.

```text
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 2019 Robin Lovelace

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
```

--------------------------------

### Install Released Version of osmextract

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Installs the stable version of the 'osmextract' package from CRAN.

```r
install.packages("osmextract")
```

--------------------------------

### Interactive Mode Notice for Programs

Source: https://github.com/ropensci/osmextract/blob/master/LICENSE.md

Display this notice when a program starts in interactive mode to inform users about its free software status, warranty, and redistribution conditions.

```text
osmextract Copyright (C) 2019 Robin Lovelace
This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'show c' for details.
```

--------------------------------

### Download England Cycleways with osmdata (fails for large data)

Source: https://github.com/ropensci/osmextract/blob/master/README.md

This example demonstrates downloading cycleways in England using the osmdata package. It highlights a common issue where Overpass API queries for large datasets can time out.

```r
library(osmdata)
cycleways_england = opq("England") %>%
  add_osm_feature(key = "highway", value = "cycleway") %>%
  osmdata_sf()
# Error in check_for_error(doc) : General overpass server error; returned:
# The data included in this document is from www.openstreetmap.org. The data is available under ODbL. runtime error: Query timed out in "query" at line 4 after 26 seconds.
```

--------------------------------

### Download OSM Data with Extra Tags for Andorra

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Example of downloading OSM data for Andorra, requesting 'ref' as an extra tag.

```r
andorra = oe_get("Andorra", extra_tags = "ref")
```

--------------------------------

### Download OSM Data for Leeds

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Example of downloading OSM data for Leeds.

```r
leeds = oe_get("Leeds")
```

--------------------------------

### Download OSM Data for Malta

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Example of downloading OSM data for Malta using oe_get(). Uses quiet=TRUE to suppress messages.

```r
malta = oe_get("Malta", quiet = TRUE)
```

--------------------------------

### Geocode and Download OSM Data for Milan

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Example of using oe_get() for a place name ('Milan') that may not have an exact match in providers, triggering geocoding via Nominatim API and downloading the smallest intersecting OSM extract. This may result in a large download.

```r
oe_get("Milan") # Warning: It will download more than 400MB of data
#> No exact match found for place = Milan and provider = geofabrik. Best match is Iran.
#> Checking the other providers.
#> No exact match found in any OSM provider data. Searching for the location online.
#> ... (extra messages here)
```

--------------------------------

### Check default download directory

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Call this function to verify the current default download directory used by the osmextract package.

```r
oe_download_directory()
```

--------------------------------

### Load osmextract Package

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Loads the 'osmextract' package into the R session. Includes a note about data licensing and package website.

```r
library(osmextract)
#> Data (c) OpenStreetMap contributors, ODbL 1.0. https://www.openstreetmap.org/copyright.
#> Check the package website, https://docs.ropensci.org/osmextract/, for more details.
```

--------------------------------

### Load sf Package

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Loads the 'sf' package, recommended for use with 'osmextract' for spatial data handling. Includes linking information for GEOS, GDAL, and PROJ.

```r
library(sf)
#> Linking to GEOS 3.13.0, GDAL 3.10.1, PROJ 9.5.1; sf_use_s2() is TRUE
```

--------------------------------

### Download and Import OSM Points Data

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Downloads and imports 'points' layer data for 'Isle of Wight' as an sf object. Uses quiet=TRUE to suppress messages and stringsAsFactors=FALSE.

```r
osm_points = oe_get("Isle of Wight", layer = "points", stringsAsFactors = FALSE, quiet = TRUE)
```

--------------------------------

### Set Test Environment Variables with withr

Source: https://github.com/ropensci/osmextract/blob/master/tests/testthat/README.md

Use withr::local_envvar to temporarily set environment variables for testing. This ensures that the OSMEXT_DOWNLOAD_DIRECTORY is set to a temporary location and TESTTHAT is set to 'true' to prevent interactive prompts from oe_clean().

```r
withr::local_envvar(
  .new = list(
  "OSMEXT_DOWNLOAD_DIRECTORY" = tempdir(),
  "TESTTHAT" = "true"
  )
)
```

--------------------------------

### Download and Import OSM Lines Data

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Downloads and imports 'lines' layer data for 'Isle of Wight' as an sf object. Uses quiet=TRUE to suppress messages and stringsAsFactors=FALSE.

```r
osm_lines = oe_get("Isle of Wight", stringsAsFactors = FALSE, quiet = TRUE)
```

--------------------------------

### Edit .Renviron file

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Use this function to open your .Renviron file and add a line to specify a custom download directory for OSM extracts.

```r
usethis::edit_r_environ()
# Add a line containing: OSMEXT_DOWNLOAD_DIRECTORY=/path/where/to/save/files
```

--------------------------------

### Download OSM Lines with Custom SQL Query

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Downloads OSM 'lines' data for Goa, filtering for 'highway' and 'geometry' columns using a custom SQL query.

```r
goa = oe_get("Goa", query = "SELECT highway, geometry FROM 'lines'")
```

--------------------------------

### Plot OSM Lines and Points Geometries

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Plots the geometries of the downloaded 'lines' and 'points' data for 'Isle of Wight'. Sets margins to zero for a clean plot.

```r
par(mar = rep(0, 4))
plot(st_geometry(osm_lines), xlim = c(-1.59, -1.1), ylim = c(50.5, 50.8))
plot(st_geometry(osm_points), xlim = c(-1.59, -1.1), ylim = c(50.5, 50.8))
```

--------------------------------

### Inspect Column Names of OSM Lines Data

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Displays the names of the columns in the 'osm_lines' sf object, showing the default variable names extracted from OSM data.

```r
names(osm_lines) # default variable names
#>  [1] "osm_id"     "name"       "highway"    "waterway"   "aerialway" 
#>  [6] "barrier"    "man_made"   "railway"    "z_order"    "other_tags" 
#> [11] "geometry"
```

--------------------------------

### Plot Major, Secondary, and Tertiary Roads

Source: https://github.com/ropensci/osmextract/blob/master/README.md

Filters the 'osm_lines' data to include only major, secondary, and tertiary roads, then plots these roads, highlighting the 'highway' type.

```r
ht = c("primary", "secondary", "tertiary", "unclassified") # highway types of interest
osm_major_roads = osm_lines[osm_lines$highway %in% ht, ]
plot(osm_major_roads["highway"], key.pos = 1)
```

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