The full trail is useful only the first few hours. After that XCSoar trims if to only few points making it difficult to locate the same wave later. I opened a ticket for this almost 2 years ago but so far it had been largely ignored.
Ramy On Sep 26, 2013, at 6:28 AM, Dan Marotta <dcmaro...@earthlink.net> wrote: > I've found it quite simple to fly wave with XCSoar simply with full > trails displayed and wind drift in cruise turned off. On initial > thermal entry through the rotor, it's best to have the zoom level set > high so you can find small areas of the wave which dip lower than > others. With that setup, you have a graphic display of where the lift > is located and where it is the strongest, and it's very easy to return > to the best lift on each pass during a climb. > > Of course, the wave is not stationary, but the trail gives a good > starting point to look for lift having been exploring elsewhere for > quite some time. > > Dan > > > On 9/26/2013 2:32 AM, Ian wrote: >> On 26/09/2013 01:10, Scott Penrose wrote: >> >>> Begin forwarded message: >>> >>>> *From: *steve jennings <skjjenni...@gmail.com >>>> I have been using xcsoar for a year and I am very grateful for the >>>> amasing work you have done.Xcsoar has made me much more efficient at >>>> flying in thermals.I was wondering how difficult it would be to write >>>> a program that would use existing formulas to predict the locations >>>> and heights of the different waves within one system.Maybe there could >>>> be a visual indicator that would show us where we are within the wave >>>> system. For example the program could show us the time left to the >>>> next wave, warn us if we are too low, or if there are any obstacles >>>> etc. .I have no idea how much work is involved since I have no >>>> knowledge of programming. I understand that this is a none lucrative >>>> endeavor which makes me even more appreciative of your hard work. They >>>> say you can't teach and old dog new tricks , well you have. I would >>>> like to thank you in advance for everything. >> I have a similar interest. Some of the things I have been thinking about: >> >> >> 1) The facility to setup a wave/ridge flying page on XCSoar with: >> >> - Wind drift on trail switched off >> - Fixed zoom at high level >> >> Then you can build up a picture of the wave system you are flying in and >> find the lift again when you need it. >> >> The idea is to setup a page that you can swipe to when you encounter >> ridge/wave. I believe the required functions are in the pipeline with >> development version of XCSoar, I have not checked its current status >> recently. >> >> >> 2) Flarm radar is a useful tool if there are multiple gliders flying in >> the wave system - you can quickly locate others who have already located >> the lift. This is already available. >> >> >> 3) Then I would like to overlay on that RASP forecasts on XCSoar. >> Ideally it would be good to overlay "pressure level cross section" >> images. Like this historical one from an interesting wave forecast: >> >> http://users.zsd.co.za/~ian2/rasp/20130425/press500.curr.1400lst.w2.png >> >> XCSoar would ideally automatically display the most relevant available >> image, based on altitude and time of day. >> >> Note the images have to be prepared from a RASP forecast in advance. >> There is some work to be done on the RASP side too. There already exists >> a utility for extracting images for XCSoar from RASP forecasts and a >> facility for displaying them. But I don't think that utility processes >> "pressure level cross sections" as these are composite images with >> multiple parameters displayed (lift and wind barbs). I host the RASP >> forecasts for South West South Africa so I will look into the RASP side >> of things when I get a chance. >> >> Ian >> >> >> ------------------------------------------------------------------------------ >> October Webinars: Code for Performance >> Free Intel webinars can help you accelerate application performance. >> Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from >> the latest Intel processors and coprocessors. See abstracts and register > >> http://pubads.g.doubleclick.net/gampad/clk?id=60133471&iu=/4140/ostg.clktrk >> _______________________________________________ >> Xcsoar-user mailing list >> Xcsoar-user@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/xcsoar-user > > > ------------------------------------------------------------------------------ > October Webinars: Code for Performance > Free Intel webinars can help you accelerate application performance. > Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from > the latest Intel processors and coprocessors. 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