[Xastir-dev] args to data_add()

[Gerry Creager N5JXS]

https://164.214.2.62/products/digitalaero/index.cfm

Brian D Heaton wrote:
> Did I miss a link somewhere?
> 	
> 		THX/BDH
> 
> 
> On Sat, 2004-04-10 at 13:49, Gerry Creager N5JXS wrote:
> 
>>OK, I've missed a few days with Mesonet business, so I'm catching up 
>>slow... Did anyone else check out NIMA's DAFIF stuff?  It's got all the 
>>shapefiles for the Sectionals and Low Altitude Enroute (OK, high alt, 
>>too!) and approach info.
>>
>>gerry
>>
>>Owen DeLong wrote:
>>
>>>I, for one, think this would be amazingly cool!!!
>>>
>>>I hadn't heard of FlightGear until this, but, I'll definitely be 
>>>checking it out.
>>>I've been bemoaning the fact that there weren't any good non-windows flight
>>>simulators available for some time now.
>>>
>>>Xastir could become a very cool moving map, and, recruiting that 
>>>community into the
>>>Xastir fold could bring in some developer resources that have expertise 
>>>on things we
>>>need (especially as we start looking at autorouting, more SAR features, 
>>>etc.).
>>>
>>>
>>>Owen
>>>
>>>
>>>--On Friday, April 09, 2004 12:28:00 -0700 "Curt, WE7U" 
>>><archer at eskimo.com> wrote:
>>>
>>>
>>>>On Fri, 9 Apr 2004, Wendell Turner wrote:
>>>>
>>>>
>>>>>What are the arguments to db.c:data_add() ?
>>>>
>>>>
>>>>I'd have to go into the code to see, just like you'll have to.
>>>>
>>>>You can look for instances where data_add() gets called, and
>>>>back-track to the types of parameters from there.
>>>>
>>>>Note that the lat/long values we use are in the Xastir coordinate
>>>>system, they're not what you're used to.  The transformations
>>>>between normal lat/long and our coordinates are very straightforward
>>>>though, and we have several examples of that in the code.
>>>>
>>>>
>>>>
>>>>>If I want to place a (moving) target on the map, it looks like
>>>>>type should be some indicator that says data will contain either
>>>>>a gps sentence or some other lat/long/alt encoding.  Correct?
>>>>
>>>>
>>>>If you just want to throw an object onto the screen, there's an
>>>>easier way.  You can put a simulated APRS sentence right into our
>>>>decoding and then tell Xastir that there's something there.  It will
>>>>then go through the normal decoding routines and you won't have to
>>>>do anything special.
>>>>
>>>>Look at the very end of interface.c:output_my_data().  You'll see
>>>>this line:
>>>>
>>>>  decode_ax25_line( data_txt, DATA_VIA_LOCAL, port, 1);
>>>>
>>>>That will throw a text line right into the decoding logic.  The APRS
>>>>specification is on www.tapr.org, which will help you to figure out
>>>>the correct sort of APRS string.
>>>>
>>>>Depending on what accuracy you require, you might consider using
>>>>APRS Compressed position reports, which give you higher resolution
>>>>than normal DD MM.MM APRS posits, or perhaps use NMEA sentences with
>>>>DD MM.MMM or DD MM.MMMM posits.
>>>>
>>>>
>>>>
>>>>>(Sorry, but I don't do radios, just aircraft.  However, now with
>>>>>the ability to use FAA sectionals, it should be easy to use
>>>>>xastir as a moving map display for the FlightGear
>>>>>(www.flightgear.org) simulator.  Would the xastir community be
>>>>>interested in those patches?)
>>>>
>>>>
>>>>If it would serve a purpose and wouldn't interfere with what we're
>>>>doing I don't see a big reason to reject it.  Some of the other
>>>>developers may have a different opinion on it though.  I guess we'll
>>>>see what other responses you get.
>>>>
>>>>-- 
>>>>Curt, WE7U                archer at eskimo dot com
>>>>Arlington, WA, USA        http://www.eskimo.com/~archer
>>>>"Lotto:    A tax on people who are bad at math." -- unknown
>>>>"Windows:  Microsoft's tax on computer illiterates." -- WE7U
>>>>"The world DOES revolve around me:  I picked the coordinate system!"
>>>>_______________________________________________
>>>>Xastir-dev mailing list
>>>>Xastir-dev at xastir.org
>>>>https://krypton.hscs.virginia.edu/mailman/listinfo/xastir-dev
>>>
>>>
>>>
>>>
>>>
>>>_______________________________________________
>>>Xastir-dev mailing list
>>>Xastir-dev at xastir.org
>>>https://krypton.hscs.virginia.edu/mailman/listinfo/xastir-dev

-- 
Gerry Creager -- gerry.creager at tamu.edu
Network Engineering -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843