cache_csv_sf_wrapper: Cache function that works with csvs of sf (SHP) files

In cgauvi/sfSpHelpers: Some functions to deal with sf/sp objects

Cache function that works with csvs of sf (SHP) files

Description

Send in a unique name to save the object and a function that will create it along with its parameters.

Usage

cache_csv_sf_wrapper(name_str, fun, id_name = "GEOID", path_dir = NA, ...)

Arguments

id_name

Details

Also possible to change the path directory otherwise will use the default one

Will zip the files (including all shp shx prj dbf in the case of shp files)

Writes the rectangular dataframe to a separate csv to avoid the name mangling nonsense associated with ESRI shp and then merges everything together using the id_name column. This means you need to know the dataset in advance, but should not be an issue if using census data - GEOID for us and GeoUID for can.

Value

fun(...) - and results cached to a zip file

Examples

## Not run: 

get_isochrone <- function(buffer_km){
 shp_point <- data.frame(X=-71.22776107610193, Y=46.805060757836486) %>% sf::st_as_sf(coords=c('X','Y'),crs=4326)
 osm <- SfSpHelpers::osm_buffer_query_helper(shp_point,buffer_km = buffer_km)

 return(osm$osm_lines)
}


shp_iso_5km <- cache_csv_sf_wrapper(name_str='qc_city_isochrone_5km',
                                  fun=get_isochrone,
                                  buffer_km=5,
                                  id_name='osm_id',
                                  path_dir=here('cache'))

shp_iso_1km <- cache_csv_sf_wrapper(name_str='qc_city_isochrone_1km',
                                 fun=get_isochrone,
                                 buffer_km=1,
                                 id_name='osm_id')

## End(Not run)

cgauvi/sfSpHelpers documentation built on June 30, 2023, 10:48 p.m.