[R-sig-Geo] FW: Re: Load a map png in ggplot2 (workaround for missing world map support in ggmap)

[Roger Bivand]

On Wed, 1 Oct 2014, Bachiller Eneko wrote:

> Dear Markus,
>
> I have found the same problem and I would like to know if you found out 
> any solution... I mean, I have some maps (from Surfer) that I would like 
> to import to ggmap. The point would be to be able to import the basemap 
> and georeference that (adjust x/y axes) in order to plot my spatial data 
> there. I guess this is the same question you made in this blog in Oct 
> 2013 but I ignore if you solved that...

I don't think anyone here knows what blog, and I don't see a link to it. 
Note that this list is plain text only, and your posting is HTML.

Please consult Oscar Perpigñan's book, in which he explains that what you 
are trying to do isn't smart, and shows how to use his package rasterVis. 
You need to import the raster file as a georeferenced raster file - 
guessing where things are may be acceptable for artistic wallpaper, but is 
no use in analysis.

Hope this helps,

Roger

>
> I would be very grateful if you could help me with some ideas and/or 
> possible alternative options. Thank you very much ended. Kindest 
> regards,
>
> Dr. Eneko Bachiller
> Institute of Marine Research
> Bergen, Norway
>
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>
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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