Crunch stores geographic data as variable metadata. There are a number of functions that help access and change this metadata.
CrunchGeography(..., data = NULL)
geo(x)
geo(x) <- value
# S4 method for CrunchVariable
geo(x)
# S4 method for CrunchVariable,CrunchGeography
geo(x) <- value
# S4 method for CrunchVariable,`NULL`
geo(x) <- value
availableGeodata(x = getAPIRoot())for CrunchGeography, named arguments from which to construct a
CrunchGeography: geodatum, feature_key, and match_field
for CrunchGeography, list of named arguments from which to construct a
CrunchGeography: geodatum, feature_key, and match_field
a crunch variable
value of the geography property to set
geographic information of class CrunchGeography (NULL if there is none)
geo retrieves the geographic information associate with a variable.
If there is geographic information it returns an object of class
CrunchGeography otherwise it returns NULL.
CrunchGeography objects store geography metadata from a variable. There are three slots:
geodatum an object of class CrunchGeodata which stores references
to the Crunch-hosted (geo|topo)json to use
feature_key a character string representing the feature inside of the
(geo|topo)json which is used to match match_field (e.g. properties.name)
match_field a character string representing the variable metadata information which is used
to match feature_key to (e.g. name)
if (FALSE) {
geo(ds$location)
geo(ds$location)$feature_key <- "properties.name"
geo(ds$location)$match_field <- "name"
}