RCzechia-package {RCzechia}

RCzechia: Spatial Objects of the Czech Republic

Description

A selection of spatial objects relevant to the Czech Republic. Due to CRAN package size requirements (5 MB) the objects are stored externally (on Amazon S3) - and therefore could not be implemented as datasets. They are functions returning data frames instead.

Details

To save time (and bandwidth) the downloaded objects are saved locally in tempdir directory when requested, and downloaded at most once per R session; out of respect to CRAN Repository Policy a more permanent caching on user's side is not attempted.

This means that:

• a working internet connection is required to use the full resolution objects

• all objects need to be called with (possibly empty) braces

For the most frequently used objects - republika, kraje and okresy - a low resolution version is also implemented. The low resolution data sets are stored locally (and working internet connection is not necessary to use them).

All objects are implemented as sf data frames.

Data overview & download sizes

• republika - borders of the Czech Republic

  source: RÚIAN / ČÚZK, high res object: 245.8 KB, low res version internal

• kraje - 14 regions / NUTS3 units

  source: RÚIAN / ČÚZK, high res object: 982.2 KB, low res version internal

• okresy - 76 + 1 districts / LAU1 units

  source: RÚIAN / ČÚZK, high res object: 2.1 MB, low res version internal

• orp_polygony - 205 + 1 municipalities with extended powers

  source: RÚIAN / ČÚZK, high res object: 3.1 MB, no low res version

• obce_polygony - 6.258 municipalities as polygons

  source: RÚIAN / ČÚZK, high res object: 13.3 MB, no low res version

• obce_body - 6.258 municipalities as centroids (points)

  source: RÚIAN / ČÚZK, high res object: 252.0 KB, no low res version

• casti - 57 city districts (where available)

  source: RÚIAN / ČÚZK, high res object: 1.5 MB, no low res version

• senat_obvody - 81 senate districts

  source: Czech Statistical Office, high res object: 10.5 MB, low res object: 50.0 KB

• volebni_okrsky - 14.733 general election districts

  source: RÚIAN / ČÚZK, high res object: 75.8 MB, low res object: 5.0 MB

• zip_codes - 2.671 ZIP code areas

  source: Czech Statistical Office, high res object: 45.4 MB, low res object: 2.1 MB

• reky - rivers

  source: Data200, high res object: 4.4 MB, low res object: 301.4 KB

• plochy - water bodies

  source: Data200, high res object: 687.0 KB, no low res version

• lesy - woodland areas

  source: ArcČR 500 v3.3, high res object: 2.1 MB, no low res version

• silnice - roads

  source: Data200, high res object: 6.0 MB, no low res version

• zeleznice - railroads

  source: Data200, high res object: 805.8 KB, no low res version

• KFME_grid - KFME grid cells (faunistické čtverce)

  source: own work, internal

• chr_uzemi - protected natural areas

  source: AOPK ČR, high res object: 7.0 MB, no low res version

• vyskopis - terrain relief

  source: Copernicus EU, high res object: 68.8 MB, no low res version

• geomorfo - geomorphological divisions

  source: CENIA / INSPIRE, high res object: <1 MB, no low res version

• historie - historical admin areas and census records, download size ~ 100 KB to 3.5 MB depending on object

  source: URRlab

Utility functions

In addition the following utility functions are implemented to support spatial workflow:

• geocode - geocoding (from address to coordinates)

• revgeo - reverse geocoding (from coordinates to address)