Description Arguments Details Value See Also Examples
Gets the nearby PWS (personal weather station) from http://www.wunderground.com based on a original search location and a distance range.
lat |
a numeric that specifies the latitude of the original search location; must be between -180 and 180 |
lon |
a numeric that specifies the longitude of the original search location; must be between -180 and 180 |
zipcode |
a numeric that specifies the zipcode of the original search location; only valid for locations within USA |
city |
a single character string that specifies the city of the original search location |
state |
a single character string that specifies the state of the original search location; should be supplied if the location is within USA |
country |
a single character string that specifies the country of the original search location; should be supplied if the location is outside USA |
distance |
a positive numeric which specifies the distance range of the nearby PWS from the original search location |
Three methods of specifying a original search location are defined. The function first searches the location by lat
and lon
if they are supplied. If lat
and lon
are not supplied, the function next searches the location by the zipcode
if it is supplied. If again zipcode
is not supplied, then the function searches the location by the city
. If state
is supplied, then the city will be searched within the USA. Otherwise if country
is supplied, then the city will be searched outside the USA.
The function then gets the nearby PWS of the original search location within a distance range which is specified by distance
.
An S4 object of class PWS-class
containing the information about the original search location and the nearby PWS. The object contains the following slots:
city
a single character string that shows the city of the original search location
state
a single character string that shows the state of the original search location; is character(0) if the origin is outside the U.S.A
country
a single character string that shows the country of the original search location; is character(0) if the the origin is within the U.S.A
lat
a numeric that shows the latitude of the original search location; must be between -180 and 180
lon
a numeric that shows the longitude of the original search location; must be between -180 and 180
data
a data frame that contains the information of the nearby PWS; in particular, the columns of the data frame should be:
neighborhood
a single character string that shows the neighborhood of the PWS
city
a single character string that shows the city of the PWS
state
a single character string that shows the state of the PWS
country
a single character string that shows the country of the PWS
id
a numeric that shows the id of the PWS
lat
a numeric that shows the latitude of the PWS
lon
a numeric that shows the longitude of the PWS
distance_km
a positive integer that shows the distance from the PWS to the original search location in kilometers
distance_mi
a positive integer that shows the distance from the PWS to the original search location in miles
see PWS-class
for more details
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