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Re: Re: Better WorldPlot data?

hi all,

please take *speed* into consideration. Plotting charts is very slow
even now. I would be more charmed with a reduced data set in which the
common borders between countries would be somehow linked ; this would
enable me to generate deformed charts where the area of a country is
proportional to its *population* (or any other property I want to
visualise). I've seen maps like that, and they were marvellous. It
would enable us to treat the dataset as more than a set of lines, more
like a graph (with all goodies in the DiscreteMath package applicable)

to show my constructive attitude (:-), here are a few lines of code that
enable you to plot great arcs :


		{Table[{r2m at Li[m2r@\[Lambda]x,m2r at tok,m2r at hon],\[Lambda]x},{\[Lambda]x,h
{Table[{r2m at Li[m2r@\[Lambda]x,m2r at tok,m2r at hon],\[Lambda]x},{\[Lam
			Table[{r2m at Li[m2r@\[Lambda]x,m2r at tok,m2r at hon],\[Lambda]x},{
              \[Lambda]x,-180*60,Min[t,h],(Min[t,h]+180*60)/n }]//N

hon=CityData["Honolulu", CityPosition]//ToMinutes
ist=CityData["Istanbul", CityPosition]//ToMinutes rom=CityData["Rome",

	Hue[0.0],  Thickness[0.005],Line/@greatcircle[hon,rom,40],	
        Hue[0.5],                   Line/@greatcircle[hon,ist,40]      


At 03:37 5-07-98 -0400, David Reiss wrote:
>In article <6nc6qv$fb1 at>, Sigurd Tjelmeland <sigurd at>
>> >
>> Does anyone know of any better WorldData databases than the one that
>> comes with Mathematica? There are two few points, and the countries get
>> a rather ugly shape. For the geographical area in which I work
>> (North-east Atlantic) I took data from the GEBCO base and transformed
>> to Mathematica lists. I am interested in Mathematica lists around the
>> globe for areas north of 50 N. My lists are of course available for
>> those interested.
>> Sigurd Tjelmeland
>> Institute of Marine Research
>> Bergen, Norway
>> sigurd at
>I would be very heplful to Mathematica users if you would  post your
>datasets to MathSource ( I think that WorldPlot
>could be made more usesful if the  database for it were more up to
>date, of higher resolution, and generally more detailed.  If anyone
>else has other data sets for use in WorldPlot, MathSource would welcome
>them with open arms (files?).
>Also, could you describe the  GEBCO base further? 
>David Reiss 
>("editor-at-large" for MathSource)
>David Reiss
>dreissNOSPAM at
>To send personal email, remove the words  "nospam" and "NOSPAM" from the
>email address
Dr. Wouter L. J. MEEUSSEN
w.meeussen.vdmcc at
eu000949 at

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