Re: [R] images and maps in R
On Fri, 27 May 2005, Don MacQueen wrote:
This is is not difficult from the online help for the map() function.
Here is an example.
map('state', region = c('new york', 'new jersey', 'penn'),fill=TRUE,col=1:4)
There is also an example there in how to add text to the map.
Another way uses the maptools package.
require(maptools)
?plot.Map
and then follow the examples given in the help page for plot.Map().
Both for map() in the maps package and plot.Map() and plot.polylist() in
the maptools package, there are three things to sort out. Firstly, are the
map polygons the same, and in the same order as the data you want to map?
Next, which palette of colours do you want to use (the RColorBrewer
palettes are well-chosen)? And finally, which breakpoints will you use
for the class intervals to divide the data into colours?
If the breakpoints are brks:
cols - brewer.pal(length(brks)-1, your choice of palette)
col_choices - findInterval(data, brks, all.inside=TRUE)
and your data are the same length and in the same order as the polygons,
thematic maps are not too difficult.
At 2:42 PM -0700 5/27/05, yyan liu wrote:
Hi:
I have a question arising from my project.
A sample of the data is below. The first row stands
for the names of state in USA. The second row stand
for some numeric value in that state. Some of them are
NA. I can use the commands data(stateMapEnv) and
map('state', fill = F) in library maps to make a
plot of USA states. What I want to do is: 1. put the
corresponding state name on the Map 2. give different
state different colors which is related to their
value. For example, red for values ranging from
0-30, green for values from 80-90, etc. 3. if
possible, put the value of each state within the state
on the map. here, take the numeric value as some text.
Thank you very much!
AB AK AL AR AZ CT CA
91 80 NA NA 17 33 20
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Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
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Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [EMAIL PROTECTED]
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[R] images and maps in R
Hi:
I have a question arising from my project.
A sample of the data is below. The first row stands
for the names of state in USA. The second row stand
for some numeric value in that state. Some of them are
NA. I can use the commands data(stateMapEnv) and
map('state', fill = F) in library maps to make a
plot of USA states. What I want to do is: 1. put the
corresponding state name on the Map 2. give different
state different colors which is related to their
value. For example, red for values ranging from
0-30, green for values from 80-90, etc. 3. if
possible, put the value of each state within the state
on the map. here, take the numeric value as some text.
Thank you very much!
AB AK AL AR AZ CT CA
91 80 NA NA 17 33 20
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] images and maps in R
This is is not difficult from the online help for the map() function.
Here is an example.
map('state', region = c('new york', 'new jersey', 'penn'),fill=TRUE,col=1:4)
There is also an example there in how to add text to the map.
Another way uses the maptools package.
require(maptools)
?plot.Map
and then follow the examples given in the help page for plot.Map().
At 2:42 PM -0700 5/27/05, yyan liu wrote:
Hi:
I have a question arising from my project.
A sample of the data is below. The first row stands
for the names of state in USA. The second row stand
for some numeric value in that state. Some of them are
NA. I can use the commands data(stateMapEnv) and
map('state', fill = F) in library maps to make a
plot of USA states. What I want to do is: 1. put the
corresponding state name on the Map 2. give different
state different colors which is related to their
value. For example, red for values ranging from
0-30, green for values from 80-90, etc. 3. if
possible, put the value of each state within the state
on the map. here, take the numeric value as some text.
Thank you very much!
AB AK AL AR AZ CT CA
91 80 NA NA 17 33 20
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
--
--
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
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