[talk-au] Geoscience NATMAP 250K Topo Maps

David Bannon dbannon at internode.on.net
Wed Nov 13 22:13:14 UTC 2013


Ah, z/y/x ? that makes sense. FoxtrotGPS does not do z/y/x.  Just what
I'd expect from GA, worked with them indirectly some time ago. Another
life.

I also played with pulling png tiles out of the GA ECW maps but gave up
dealing with their website, they made endless changes that broke firefox
each time. Got sick of explaining to their tech (??) people that I found
it difficult to run Internet Explorer under linux. (So even then they
were not keen on open standards !)

Then the license holder withdrew the ecw plugin for GDAL...

Anyway, this new GA tile server still sounds cool, will have to look
into what can be done.

Thanks for your help.

David


On Wed, 2013-11-13 at 22:20 +1100, Andrew Harvey wrote:
> On 13 November 2013 22:01, David Bannon <dbannon at internode.on.net> wrote:
> > Interesting Andrew. Do you know much about this service ?
> 
> I know that they also publish the original ECW files, which I
> originally converted to JPEG and hosted on my own server as a service
> which converted these into web map tiles, until I found that GA
> already have such a service!
> 
> GA are using ArcGIS Server to serve the tiles, but they do conform to
> the same specification as OSM tiles.
> 
> > 1. While I request png files I seem to get JPEG
> 
> I don't think they serve PNG files, only JPEG.
> 
> > 2. Their Y and X number system seems to be miles away from where I'd
> > expect it to be. I need to browse to somewhere in Antarctica, south of
> > Africa before I could get any (Aussie) tiles back.  I used to understand
> > the numbering system, sigh, better get my old notes out..
> >
> > Anyway, Foxtrot is quite confused, does display tiles but somehow in the
> > wrong order, interesting !
> 
> Make sure you are using z/y/x and NOT z/x/y (so it is different to OSM
> tiles) otherwise it will look like one of those puzzles.





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