Re: [Opengc-devel] maps on nav display

[Damion S. <da...@op...>]

I spent several hours last night looking at the data, and I think it 
will be pretty straightforward to use. Any TIFF library is capable of 
reading the images (I had no trouble opening them in Photoshop). The 
only marginally tricky bit is extracting the appropriate metadata for 
the projection tags, but there is quite a bit of documentation and 
sample code at http://remotesensing.org/geotiff/geotiff.html

The thing that I'm not quite clear on is how to handle the boundaries 
of the sectionals. Although each sectional uses the Lambert Conformal 
Conic projection, the projection parameters vary for each chart. This 
could present a challenge when we go to overlay additional nav data on 
top of the sectional images, since we'd have to deal with two different 
conic projections on the same display. I laid a bunch of my paper 
sectionals out and they seem to match up pretty well, so it may not be 
a huge problem.

-Damion-


On Dec 2, 2003, at 10:35 AM, Wendell Turner wrote:

>>> I found an unsupported program
>>>   http://www.hsge.de/geo-spatial/software/index.html
>>> that will read & display the images, so that may be a starting
>>> point.
>>
>> I'll take a look at it. Thanks for the info.
>
> I've tweaked the program to accept NMEA sentences from
> flightgear, so this may help:
>
> Program
>   http://www.hsge.de/geo-spatial/software/hugo/hugo-1.2.tar.gz
>
> My notes/readme file
>   http://www.halcyon.com/wturner/hugo.readme
> And the patches to make the program work
>   http://www.halcyon.com/wturner/hugo.patch 
>