Hi again
I've just been through the source code to work out the file format. It actually
turned out to be rather simple - just a series of segments made up of 2 byte
numbers. Each starts with the number of points in the segment followed by the
lons then the lats for that segment. I've generated high res binary files based
on the coastline files from the ascii CIA files. If anyone else would like the
files then let me know.
Andrew - I think that although the data may have come from the CIA files, I
don't think plPlot uses the original format. The ascii files have a much higher
resolution than the two byte plPlot files which results in some rather
unpleasant aliasing. I've put an example at
http://homepages.see.leeds.ac.uk/~earpros/plplottest/trackplot.png showing the
SE of the UK. It is still much better than the previous results, but maybe if
the devs would consider allowing a 3 or 4 byte per point format the results
would be much improved.
Phil
________________________________
From: phil rosenberg <philip_rosenb...@yahoo.com>
To: Andrew Roach <aroach....@yahoo.com>
Sent: Thursday, 13 September 2012, 16:04
Subject: Re: [Plplot-devel] map resolution
Unfortunately after a significant amount of searching i've only been able to
find ascii versions of the CIA maps (which were on the page you suggested
Andrew). The maps with plPlot are binary so these don't work.
If anyone has copies of more detailed maps then I'd appreciate it if you'd let
me know. At the moment I'm going to have to read in and plot the ascii maps as
a line plot, but I won't end up with the useful features of the plmaps routine.
Cheers
Phil
________________________________
From: Andrew Roach <aroach....@yahoo.com>
To: phil rosenberg <philip_rosenb...@yahoo.com>
Sent: Thursday, 13 September 2012, 12:13
Subject: Re: [Plplot-devel] map resolution
At 03:53 AM 13/09/2012 -0700, you wrote:
> Hi all
> I was just wondering what the format of the plPlot map files is? The maps
> included in plPlot are rather low resolution so wondered if it was possible
> for me to download more detailed ones form somewhere?
>
> Phil
It was the CIA World DataBank map format. Many years ago I did use higher res
versions for something or other - they are out there if you look.
http://www.evl.uic.edu/pape/data/WDB/ might be some from what I can see.
-Andrew
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Plplot-devel mailing list
Plplot-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/plplot-devel
