paai wrote:
> Juergen Wieferink wrote:
>> paai wrote:
>>> I have a dataset with three columns: x y z. The first two are the
>>> coordinates of dutch cities; the third column is an integer. I want
>>> a picture of a map of Holland with the cities and on every city a
column
>>> with height z.
>>>
>>> I tried things like splot "< dataset" with impulses, but all columns
>>> seem to be the same length. Also, I have no idea how to project a map
of
>>> Holland under the graph.
>>
>> Tricky. Please have a look at "help vector", "help using" and "help
>> image". If the map is in a PNG file, you may want to convert it
>> using "pngtopnm -plain map.png >map.pam" to get a gnuplot-parsable
>> text file for use with "image".
>>
>> Juergen
>
> The data now are plotted OK, but the map of Holland still
> eludes me.
> Converting the map to pam does not really result in something
> that gnuplot (or I) understands.
The format is explained in the netpbm do***entation (plain pnm). It
consists essentially the color values of all the pixels written in
ASCII. Sadly, the format is not gnuplot matrix compatible, so it
has to be reformatted. I don't know the definite answer either.
Good luck with it!
Juergen
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