----------------------------------------
> Date: Tue, 7 Jun 2011 09:50:10 -0700
> From: egregory2...@yahoo.com
> To: r-help@r-project.org
> Subject: [R] RgoogleMaps Axes
>
> R Help,
>
>
> I posted a question on StackOverflow yesterday regarding an issue I've been
> having with the RgoogleMaps packages' displaying of axes. Here is the text of
> that submission:
> http://stackoverflow.com/questions/6258408/rgooglemaps-axes
>
> "I can't find any documentation of the following problem I'm having with the
> axis labels in RGoogleMaps:
> library(RgoogleMaps)
> datas <-structure(list(LAT =c(37.875,37.925,37.775,37.875,37.875),
> LON =c(-122.225,-122.225,-122.075,-122.075,-122.025)),
> .Names=c("LAT","LON"),class="data.frame",
> row.names =c(1418L,1419L,1536L,1538L,1578L))
> # Get bounding box.
> boxt <-qbbox(lat =datas$LAT,lon =datas$LON)
> MyMap<-GetMap.bbox(boxt$lonR,boxt$latR,destfile ="Arvin12Map.png",
> maptype ="mobile")
> PlotOnStaticMap(MyMap,lat =datas$LAT,lon =datas$LON,
> axes =TRUE,mar =rep(4,4))
>
I haven't gotten too far as I had to download and install proj4 and rgdal
but I did get a transofrm related warning. Did you get warnings?
> MyMap<-GetMap.bbox(boxt$lonR,boxt$latR,destfile ="Arvin12Map.png",maptype ="m
obile")
[1] "http://maps.google.com/maps/api/staticmap?center=37.85,-122.125&zoom=12&siz
e=640x640&maptype=mobile&format=png32&sensor=true"
Loading required package: rgdal
Loading required package: sp
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 1.8.0, released 2011/01/12
Path to GDAL shared files: /usr/local/share/gdal
Loaded PROJ.4 runtime: Rel. 4.7.1, 23 September 2009
Path to PROJ.4 shared files: (autodetected)
Warning message:
In readGDAL(destfile, silent = TRUE) : GeoTransform values not available
>
> PlotOnStaticMap(MyMap,lat =datas$LAT,lon =datas$LON,
+ axes =TRUE,mar =rep(4,4))
List of 6
$ lat.center: num 37.8
$ lon.center: num -122
$ zoom : num 12
$ myTile : int [1:640, 1:640] 968 853 855 969 1033 888 855 884 888 995 ...
..- attr(*, "COL")= chr [1:1132] "#000000" "#020201" "#020202" "#030302" ...
..- attr(*, "type")= chr "rgb"
$ BBOX :List of 2
..$ ll: num [1, 1:2] 37.8 -122.2
.. ..- attr(*, "dimnames")=List of 2
.. .. ..$ : chr "Y"
.. .. ..$ : chr [1:2] "lat" "lon"
..$ ur: num [1, 1:2] 37.9 -122
.. ..- attr(*, "dimnames")=List of 2
.. .. ..$ : chr "Y"
.. .. ..$ : chr [1:2] "lat" "lon"
$ url : chr "google"
NULL
[1] -291.2711 291.2711
[1] -276.5158 276.7972
> When I run this on my computer the horizontal axis ranges from 300W to 60E,
> but the ticks in between aren't linearly spaced (300W, 200W, 100W, 0, 100E,
> 160W, 60W). Also, the vertical axis moves linearly from 300S to 300N. It
> seems that no matter what data I supply for datas, the axes are always
> labeled this way.
> My question is:
> 1. Does this problem occur on other machines using this code?
> 2. Does anyone have an explanation for it?
> and
> 3. Can anybody suggest a way to get the correct axes labels (assuming these
> are "incorrect", but maybe i'm somehow misinterpreting the plot!)?
> Thank you for your time."
>
> There has been no answer other than that I ought to contact the package
> maintainer. Since it would be nice to have a publicly displayed solution, I
> opted to post here first before doing so. Does anyone have any insight to
> share?
> Thank you very much for your time,
>
> -Erik Gregory
> CSU Sacramento, Mathematics
> Student Assistant, California Environmental Protection Agency
>
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>
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