[R-sig-Geo] adding a scale

[Roger Bivand]

On Fri, 24 Apr 2015, Gilles Benjamin Leduc wrote:

> Hi again, 
>
> So, I use the plot() function. 
> I read a shapefile, that I convert in GPS coordinates like this:

Please do provide a reproducible example. When you have a working 
reproducible example, you'll find that you have solved your problem. Note 
that right-assignment is confusing. Have you consulted the R spatial 
graphics gallery:

http://rspatial.r-forge.r-project.org/gallery/

Further note that metric scales are hard to get right on maps in degrees. 
Usually, the inclusion of annotated axes is a rational substitute for a 
scale bar, and by default the vertical axis is the same as the North 
arrow, which is only really needed when vertical is not North.

Roger

>
> readOGR(dsn="IS50V_STRANDLINA_24122014_ISN2004/IS50V_STRANDLINA_SHP", layer="is50v_strandlina_flakar_24122014")->IslHD
> spTransform(IslHD,CRS(" +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0 "))->IslHD 
>
> then plot : plot(IslHD) 
>
> I tried several stuff for making a scale, results were either ugly or wrong… 
> The function Scalebar make a cute scale but really absurd… 
>
> Any idea? 
>
> Best regards
>
> Benjamin 
> 
> 
> On Thursday, April 23, 2015 05:18 GMT, Frede Aakmann Tøgersen <frtog at vestas.com> wrote: 
> 
>> Hi Benjamin
>> 
>> Yes, there are several ways to do that. But it depends on which kind of plotting function you used. Usually it is a setting of an argument of the plotting function.
>> 
>> I cannot help you more since I don't more than the information you provided in your email.
>> 
>> If you want more help from this list please provide a small example showing which functions you used with information on which package(s) they belong. Then you'll probably get more help.
>> 
>> The small example you can probably find in the example section on the help page for the plotting function.
>> 
>> Best Regards
>> 
>> Frede Aakmann Tøgersen
>> Specialist, M.Sc., Ph.D.
>> Plant Performance & Modeling
>> 
>> Technology & Service Solutions
>> T +45 9730 5135
>> M +45 2547 6050
>> frtog at vestas.com
>> http://www.vestas.com
>> 
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>
>> 
>> -----Original Message-----
>> From: R-sig-Geo [mailto:r-sig-geo-bounces at r-project.org] On Behalf Of Gilles Benjamin Leduc
>> Sent: 23. april 2015 02:46
>> To: r-sig-geo at r-project.org
>> Subject: [R-sig-Geo] adding a scale
>> 
>> Hi all,
>> 
>> I am ploting map from shapefiles (curently read with readOGR from rgdal). 
>> My PhD supervisor asked me to add a scale… Before going in crazy computation and the arrow function I wonder… Is there a function that can do it automatically (or easily) 
>> 
>> Thanks in advance 
>> 
>> Benjamin
>> 
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-- 
Roger Bivand
Department of Economics, Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 91 00
e-mail: Roger.Bivand at nhh.no