[R] Interactive maps
Antonio Serrano
aasdelat at aim.com
Tue Apr 28 10:35:56 CEST 2015
Thank you, Ben. I've just subscribed to R-sig-geo as you recommend. I'll post this staff there.
Antonio Serrano
aasdelat en aim.com
ن
-----Original Message-----
From: Ben Tupper <btupper en bigelow.org>
To: Antonio Serrano <aasdelat en aim.com>
Cc: r-help <r-help en r-project.org>
Sent: Mon, Apr 27, 2015 7:59 pm
Subject: Re: [R] Interactive maps
Hi,
You may want to redirect your question to the R-sig-Geo mailing list:
https://stat.ethz.ch/mailman/listinfo/r-sig-geo
In the meantime, you
might consider writing to the 'rasterfile' format. The 'rasterfile' format is
very well documented and is to read/write from R; I suspect it would easy for
you to write to this format from Fortran. See the details
here:
http://cran.r-project.org/web/packages/raster/vignettes/rasterfile.pdf
Cheers,
Ben
On
Apr 27, 2015, at 11:55 AM, Antonio Serrano via R-help <r-help en r-project.org>
wrote:
>
>
> Ok.
>
>
> The point now is that I have the sources (in
Fortran) of the program that produces the graph with the map. And have to attach
the information about the xrange and yrange to this graph in order for them to
be read from R. Id est, I have to write: first longitude, first latitude, last
longitude, last latitude, and also, the "figure" coordinates of the bounding box
of the map in the figure.
>
> If I produce the map in eps, I can open it as a
text file from the same fortran rogram, and modify the contents of the eps file
in order to put the coordinates information into it.
>
> Then, once the
fortran program has ended, I convert the eps to png using ImageMagic, because
the EBImage library doesn't read eps, but png.
>
> In order for the png to
contain the same properties as the eps, these have to be correctly defined in
the eps.
>
> So, the question now is: how can I properly define properties in
a eps, so that these are preserved in the convertion to png?.
>
> Perhaps
this is not for this forum, but I haven't found information about it in the
internet.
>
>
>
>
>
> Antonio Serrano
> aasdelat en aim.com
>
ن
>
>
>
>
>
>
>
>
> -----Original Message-----
> From:
Jim Lemon <drjimlemon en gmail.com>
> To: Antonio Serrano <aasdelat en aim.com>
> Sent: Sun, Apr 26, 2015 1:03 am
> Subject: Re: [R] Interactive maps
>
>
>
> Hi Antonio,
> If you mean the normalized figure coordinates
(i.e. from 0 to 1)
> then
> you want something like
> this:
>
>
loc_convert<-function(n=1,xrange=c(0,1),yrange=c(0,1)) {
>
>
plot_loc<-locator(n=n)
> plot_loc$x<-plot_loc$x/diff(xrange)+xrange[1]
>
>
plot_loc$y<-plot_loc$y/diff(yrange)+yrange[1]
> return(plot$loc)
> }
>
>
where
> xrange and yrange are the longitudes and latitudes respectively.
>
>
Jim
>
>
> On
> Sun, Apr 26, 2015 at 1:09 AM, Antonio Serrano
<aasdelat en aim.com> wrote:
>> Thank
> you, Jim:
>>
>> I have tried your
suggestion and I get the following
> error:
>>
>> Error en
rasterImage(image = "map.eps", :
>> invalid color
> name 'map.eps'
>>
>>
I have tried with three formats of the same image: svg,
> gif and eps, with
>>
the same result.
>>
>> But I have found a possible better
> way to
accomplish this objective in the
>> following thread:
>>
>
http://r.789695.n4.nabble.com/Loading-an-image-picture-png-jpeg-to-screen-td2244923.html
>>
>>
> In short:
>>
>> library(gridExtra)
>> library(EBImage)
>>
library(RGraphics)
>>
> x <-
readImage("http://www.google.com/logos/teachersday09.gif")
>> g1 <-
>
ebimageGrob(x)
>> dev.new(width=g1$width/72, height=g1$height/72)
>>
>
plot.new()
>> grid.draw(g1)
>> c=locator(n=1, type="n")
>>
>> Then, when I
click
> on the map, I get the "figure" coordinates where I
>> clicked, and
still have to
> translate these to longitude-latitude.
>>
>> And here comes
another question:
> How can I attach the first longitude, last
>> longitude,
fisrt latitude, last
> latitude, to a JPEG, PNG or TIFF graphic?.
>> These are
the formats supported by
> the EBImage package.
>>
>>
>>
>> Antonio
Serrano
>> aasdelat en aim.com
>>
> ن
>>
>>
>> -----Original
Message-----
>> From: Jim Lemon
> <drjimlemon en gmail.com>
>> To: Antonio
Serrano <aasdelat en aim.com>
>> Sent: Sat,
> Apr 25, 2015 8:36 am
>> Subject:
Re: [R] Interactive maps
>>
>> Hi Antonio,
>>
> Try the rasterImage
function.
>>
>> Jim
>>
>>
>> On Sat, Apr 25, 2015 at
>> 4:19
> PM,
Antonio Serrano <aasdelat en aim.com> wrote:
>>> Thank you, Jim.
>>>
>>> I
>>
> didn't know the existence of the locator() function. But I can see now
>>>
that
> I
>> don't know how to read a graphic image into R to work with
it.
>>> How can
> I read
>> a pre-exisiting image into R?.
>>>
>>> Thanks
again
>>>
>>>
>>>
> Antonio Serrano
>>>
>> aasdelat en aim.com
>>>
ن
>>>
>>>
>>> -----Original
> Message-----
>>> From: Jim Lemon
>>
<drjimlemon en gmail.com>
>>> To: Antonio
> Serrano <aasdelat en aim.com>
>>> Cc:
r-help
>> mailing list
> <r-help en r-project.org>
>>> Sent: Sat, Apr 25, 2015
5:47 am
>>>
>> Subject: Re:
> [R] Interactive maps
>>>
>>> Hi
Antonio,
>>> If you do create the map
>> in R,
> you can use
>>>
locator().
>>>
>>> Jim
>>>
>>>
>>> On Sat, Apr 25, 2015 at
> 8:37
>>
AM, Antonio Serrano via
>>> R-help
>>> <r-help en r-project.org>
> wrote:
>>>>
>>>>
>> Hello, all:
>>>>
>>>> I am new here,
>>> and have a
>
challenge to present some
>> graphical data to the user in a
>>>
convenient
>>>
> way.
>>>>
>>>> The challenge
>> is to present a map to
the user which is
> coloured
>>> with the value of a
>> variable. Say for
example, temperature. This
> is a
>>> preexisting graph that I
>> can
generate in any format, including svg.
> I don't
>>> have
>>> to produce
it
>> using R.
>>>>
>>>> When the user clicks
> anywhere in the map,
the
>>> coordinates
>> (longitude and latitude) have to be
> passed to R so
that this, R,
>>> can
>>> look
>> for the values of other
> variables in
that location and make another
>>> graph
>>>
>> with
> them.
>>>>
>>>>
Does anyubody know how could I accomplish
>>
> this?.
>>>>
>>>>
>>>
Thanks in advance.
>>>>
>>>>
>>>>
>>>> Antonio
> Serrano
>>>>
>>
aasdelat en aim.com
>>>> ن
>>>>
>>>>
>>>>
>>> [[alternative HTML
>
version
>> deleted]]
>>>>
>>>>
>>>
>
______________________________________________
>>>>
>>
R-help en r-project.org
> mailing
>>> list -- To UNSUBSCRIBE and more, see
>>>>
>>>
>>
> https://stat.ethz.ch/mailman/listinfo/r-help
>>>> PLEASE do read
the posting
>>
> guide
>>> http://www.R-project.org/posting-guide.html
>>>>
and provide
> commented,
>> minimal,
>>> self-contained, reproducible
code.
>
>
>
>
>
> [[alternative HTML version deleted]]
>
>
______________________________________________
> R-help en r-project.org mailing
list -- To UNSUBSCRIBE and more, see
>
https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal,
self-contained, reproducible code.
Ben Tupper
Bigelow Laboratory for Ocean
Sciences
60 Bigelow Drive, P.O. Box 380
East Boothbay, Maine
04544
http://www.bigelow.org
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