If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
"Julian Scarfe" wrote in message ...
"Ben Jackson" wrote in message news:tCmbd.121529$He1.75934@attbi_s01... I keep meaning to apply Dijkstra's algorithm to airway routing. The key will be choosing edge costs. I tried something similar for Western Europe. Thinking aloud... My algorithm was basically: a) load the entire airway network as a graph using distances as costs *** I would modify that to use a combination of distance and MEA as the cost. I've found that in my personal flight planning, lower MEAs often translate into a better flight, even if they involve a bit of a dogleg. - Jerry Kaidor ( ) |
#12
|
|||
|
|||
Y'all,
My IFR is usually in the SF Bay Area. I have found that the preferred routes take me miles out of my way. I have also found that a brief negotiated change of route suc as direct to a fix that cuts 30-40 miles off the preferred airways is justified. Consider IFR to Las Vegas. MEA 16K or above. Even 13K takes you all the way around Edwards. Negotiated changes work if known and used. I would suggest that at some point an indicator on the system would tell the pilot that it is time to negotiate a change. Gene Whitt |
#13
|
|||
|
|||
I always understand better with pictures
This is how I understand how this thingy works. http://www.v1rotate.com/images/navmap.gif basically draw 3 boxes and do all the calculations inside within these boxes. This will limit the fixes to calculate. Limit area #1 for your origin, area #2 for your destination (allow fixes to be within these boxes so they can join to airways.) Limit area #3 for route (Only vor's within airways) KBWI EMI J211 JERES J211 BUSTR J211 LEONI J211 JST J152 AVERE KPIT jeres bustr and leoni could be dropped, since they are on same airways KBWI EMI J211 JST J152 AVERE KPIT Here is another link that might interest or help us within this project. http://gis.vegcrew.net/cgi-bin/viewc....1&view=markup Hank |
#14
|
|||
|
|||
"v1rotate dot com" writes:
basically draw 3 boxes and do all the calculations inside within these boxes. This will limit the fixes to calculate. It's not clear to me that these regions can be adequately chosen from the start (especially for long flights) but it certainly would simplify things. Limit area #1 for your origin, area #2 for your destination (allow fixes to be within these boxes so they can join to airways.) I think these will need to extend well beyond the endpoints. As a worst case example, consider a trip to an airport just on the other side of a mountain that is too high to traverse directly. jeres bustr and leoni could be dropped, since they are on same airways Dropping seems dangerous. What if one of those dropped waypoints is close to your destination? Will you pick that up later? --kyler |
#15
|
|||
|
|||
Dropping I mean could be dropped from processing, since they are on the
airways db... No need to process fixes, if they are already in the airways list. They are still listed, but not processed. Only start and end of the airways are processed. Extend as far as needed. (ie 250 miles from centerline... no need to calculate fixes beyond this unless you wanted to.) Just wanted to spark up the discussion Hank |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
AVIATIONTOOLBOX: automatic route selection | Kyler Laird | Instrument Flight Rules | 19 | October 22nd 04 07:02 PM |
NAS and associated computer system | Newps | Instrument Flight Rules | 8 | August 12th 04 05:12 AM |
filing IFR plan for VFR flight conditions | Paul Safran | Instrument Flight Rules | 53 | May 11th 04 03:07 AM |
AVIATIONTOOLBOX: alpha version of route mapping tool | Kyler Laird | General Aviation | 0 | January 1st 04 09:21 PM |
USAF = US Amphetamine Fools | RT | Military Aviation | 104 | September 25th 03 03:17 PM |