Hi,
I gave the answer in my previous e-mail
library(sp)
data(meuse) # data.frame
# The columns with the x and y coordinates are called "x" and "y"
coordinates(meuse) = ~x+y # SpatialPointsDataFrame
A good source of additional information is the sp-documentation or the
book Applied Spatial Data Analysis in R.
cheers,
Paul
Alina Sheyman schreef:
My data consists of lat, long, and the number of customers associated
with each
How do I go about converting my data.frame to a spatial object?
On Tue, Mar 3, 2009 at 3:40 PM, Paul Hiemstra <p.hiems...@geo.uu.nl
<mailto:p.hiems...@geo.uu.nl>> wrote:
Hi,
You have to provide some more info in order for us to answer you
question. How does 'your data' look like? A data.frame with x and
y coordinates and more info? If this is correct, you need to
convert the xy data.frame to a spatial object:
library(sp)
data(meuse) # data.frame
# The columns with the x and y coordinates are called "x" and "y"
coordinates(meuse) = ~x+y # SpatialPointsDataFrame
Then you can use overlay() to find out in which customer is in
which polygon. Then you can count the number of customers per zip
code.
cheers,
Paul
Alina Sheyman schreef:
I'm very new to creating maps using shapefiles, so this
question might be
pretty basic.
I'm trying to create a map of the US, divided up by zip codes,
where i then
map number of customers by zip code.
I located shapefiles for US with zip codes (although at this
point only for
individual states, and not the entire country) and read it
into R using
maptools,
but now I need to apply my data (which I read into R as a
separate data
frame and not a shapefile) to that map. Which is the part
where I get
completely lost and not sure how to proceed. If anyone could
give me any
pointers I'd really appreciate it.
thank you
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--
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone: +3130 274 3113 Mon-Tue
Phone: +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul <http://intamap.geo.uu.nl/%7Epaul>
--
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone: +3130 274 3113 Mon-Tue
Phone: +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul
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