### Installation from CRAN

Source: https://github.com/kadyb/rgugik/blob/master/README.md

Installs the released version of the rgugik package from CRAN.

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

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

### Installation from GitHub

Source: https://github.com/kadyb/rgugik/blob/master/README.md

Installs the development version of the rgugik package from GitHub.

```r
# install.packages("remotes")
remotes::install_github("kadyb/rgugik")
```

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

### Orthophotomap Usage Example

Source: https://github.com/kadyb/rgugik/blob/master/README.md

Demonstrates how to use the rgugik package to download orthophotomap data. It involves reading a polygon, requesting orthoimages for that polygon, and then filtering for a specific year.

```r
library(rgugik)
library(sf)
library(stars)

polygon_path = system.file("datasets/search_area.gpkg", package = "rgugik")
polygon = read_sf(polygon_path)

req_df = ortho_request(polygon)

# select the oldest image
req_df = req_df[req_df$year == 2001, ]

```

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

### Cloning the repository and setting up upstream

Source: https://github.com/kadyb/rgugik/blob/master/CONTRIBUTING.md

Steps to clone the repository and configure upstream remote for tracking changes.

```bash
git clone https://github.com/kadyb/rgugik.git
git remote add upstream https://github.com/kadyb/rgugik.git
git fetch upstream
git pull upstream
```

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

### Download image

Source: https://github.com/kadyb/rgugik/blob/master/README.md

This snippet demonstrates how to download an image and then read and plot it using the 'stars' package.

```r
# download image
tile_download(req_df)
#> 1/1

img = read_stars("41_3756_N-33-130-D-b-2-3.tif")
plot(st_rgb(img), main = NULL)
```

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

### Print metadata

Source: https://github.com/kadyb/rgugik/blob/master/README.md

This snippet shows how to print metadata for a given request dataframe.

```r
# print metadata
t(req_df)
#>             31                                                                              
#> sheetID     "N-33-130-D-b-2-3"                                                              
#> year        "2001"                                                                          
#> resolution  "1"                                                                             
#> composition "RGB"                                                                           
#> sensor      "Satellite"                                                                     
#> CRS         "PL-1992"                                                                       
#> date        "2001-01-01"                                                                    
#> isFilled    "TRUE"                                                                          
#> URL         "https://opendata.geoportal.gov.pl/ortofotomapa/41/41_3756_N-33-130-D-b-2-3.tif"
#> filename    "41_3756_N-33-130-D-b-2-3"                                                      
#> seriesID    "41"
```

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

### Administrative boundaries

Source: https://github.com/kadyb/rgugik/blob/master/README.md

This snippet shows how to retrieve and plot administrative boundaries for a specific voivodeship (Opolskie in this case).

```r
library(rgugik)
library(sf)

# get counties from opolskie voivodeship (TERYT 16)
counties = county_names
counties = counties[substr(counties$TERYT, 1, 2) == "16", "TERYT"]
counties_geom = borders_get(TERYT = counties)
plot(st_geometry(counties_geom), main = "Opolskie")
```

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