RE: Plot a map of Europe

[PhilipNienhuis]

Jorgen Sandberg wrote
> Dear Mr Potorti,
> 
> Thank you for the mail.
> 
> I am trying to make M_Map work with Octave, but I am facing some
> incompatibilities like "verLessThan" can't be found.
> 
> Do you know of a way to plot a map of Europe that works with Octave?
> 
> Regards,
> Jorgen Sandberg
> 
> -----Original Message-----
> From: Francesco Potortì [mailto:

> address@hidden

> ] 
> Sent: 10 November 2015 17:21
> To: Jorgen Sandberg <

> jorgen@

> >
> Cc: 

> help@

> Subject: Re: Plot a map of Europe
> 
>>I have searched the internet, but not found a real "how to" instruction 
>>on how to plot a map of for example Europe and add a contour on top. I 
>>need to know the packages to install and where I can find map data in a 
>>format accepted by OCTAVE. I really needs an idiots guide to plotting 
>>maps in OCTAVE.
> 
> Generally speaking, you can draw a plot on top of any background image.
> The general way to do so is something like
> 
>     map = imread(mapfile);
>     image(map);
>     axis('image', 'off', 'nolabel');
>     hold on
>     plot(x, y);
> 
> x and y should use the same measure of unit as the map, that is, pixels.

As of recently there's a new OF mapping package release for Octave that
contains ArcGIS shaperead, shapedraw and geoshow / mapshow functions. 
They're still a bit experimental, esp. geoshow / mapshow, but you give it a
try.  And I'd love to get feedback on them (on the bug tracker of patch
tracker).

To get it:

pkg install -forge mapping
pkg load mapping

If you can uncover a map of Europe in .shp format [1] (you'll probably need
the .shp .idx .dbf files but just .shp will do as well) you can then simply
read and plot them:

shp = shaperead (<.shp filename in quotes>);
shapedraw (shp)

or simply (less efficiënt as the map must be read each time):

shapedraw (<.shp filename between quotes>)

The commands

help shaperead
and
help shapedraw

give info on how to call those functions.

Philip

[1] google for "europe shape map"to get e.g.,:
http://www.mapcruzin.com/free-europe-arcgis-maps-shapefiles.htm    (but
maybe too complicated)
http://www.eurogeographics.org/products-and-services/euroboundarymap
etc
etc
etc




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