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TDZ precision markings

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Re: TDZ precision markings

Postby SurferTim » Sat Jul 20, 2019 10:38 am

I can put that rise in just about like that, but I need to know if I have the longitude right.

The new hgt file should have a 2 meter rise in it, but it may be too far east and not steep enough.
Download the hgt file, build the scenery with it, then post the scenery or a pic so I can see where the rise is.
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Re: TDZ precision markings

Postby legoboyvdlp » Sat Jul 20, 2019 10:42 am

I already did build the scenery and I already did post a picture....? Indeed, its at the 26 end of the runway. It's right - just need one at the 08 end now of about 1.3 meters (ie 4 feet) :)
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Re: TDZ precision markings

Postby Alant » Sat Jul 20, 2019 11:14 am

These are usually defined using WED which AFAIK writes then to apt.dat.
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Re: TDZ precision markings

Postby SurferTim » Sat Jul 20, 2019 11:59 am

The scenery I used that you posted shows the runway as flat. No gradient.
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Re: TDZ precision markings

Postby legoboyvdlp » Sat Jul 20, 2019 12:42 pm

Alant wrote in Sat Jul 20, 2019 11:14 am:These are usually defined using WED which AFAIK writes then to apt.dat.
Alan


I am aware of that - but why is my runway blank after processing in TerraGear?

SurferTim wrote in Sat Jul 20, 2019 11:59 am:The scenery I used that you posted shows the runway as flat. No gradient.

Image

You can't see the end of the runway here - I think the slope is there, although very slight. :?:
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Re: TDZ precision markings

Postby SurferTim » Sat Jul 20, 2019 1:45 pm

If it doesn't display the correct gradient. then the reason may be you are not using --max-slope.
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Re: TDZ precision markings

Postby Alant » Sat Jul 20, 2019 2:39 pm

As a test you could ( using WED ;) ) move the threshold further down the runway.
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Re: TDZ precision markings

Postby legoboyvdlp » Sat Jul 20, 2019 3:00 pm

SurferTim wrote in Sat Jul 20, 2019 1:45 pm:If it doesn't display the correct gradient. then the reason may be you are not using --max-slope.


I passed that parameter to genapts, so I would hope it is using --max-slope :P I may have mis-calculated... will try to see what the correct value should be.

AlanT, not quite certain - is that about the markings, or about the slope?
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Re: TDZ precision markings

Postby Alant » Sat Jul 20, 2019 3:11 pm

About your missing markings. You clearly have some of them visible, if you use WED to move them further from the runway end, then you will know if the fault is with apt.dat and terragear or something else such as the runway going under the grass.

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Re: TDZ precision markings

Postby SurferTim » Sat Jul 20, 2019 4:58 pm

The --max-slope parameter requires a value. D-ECHO is the one to give you advice on what that value should be. He did a great job on St Barth with my bulldozing.
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Re: TDZ precision markings

Postby legoboyvdlp » Sat Jul 20, 2019 5:08 pm

Yep, I already calculated that to be 0.0025 but if anyone proposes another one I can try it.
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Re: TDZ precision markings

Postby SurferTim » Sat Jul 20, 2019 5:34 pm

I bulldozed the runway so we both should be able to see where it should be.
http://www.prolectron.com/flightgear/N49W003.hgt

It will go from 82 meters (271') to 84 meters (277') in about 70 meters.

Edit: I don't think your --max_slope value is sufficient.
A 6 foot rise over 600 feet is 1 percent ( 0.01 )
A 6 foot rise over 300 feet is 2 percent ( 0.02 )

The second is probably closer to what you want.
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Re: TDZ precision markings

Postby legoboyvdlp » Tue Jul 23, 2019 7:43 pm

Ok, thank you. I will try that last value.

Edit - the result:
Image
Image

The slope is quite nice, except the runway at the end has this rather strange cliff with a very very thin part raised up?

And there needs to be a slope at the 26 end.
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Re: TDZ precision markings

Postby SurferTim » Tue Jul 23, 2019 8:09 pm

It's hard to tell from the pic. Is the top of the rise in the right place?

Edit: If the top of the rise is in the correct place, I can slope the other end and reduce the cliff size.
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Re: TDZ precision markings

Postby legoboyvdlp » Tue Jul 23, 2019 8:29 pm

No - you don't understand.

The 26 (eastern) end needs a similar bump to the 08 one!

The top of the rise is near the end of 08.

I think perhaps I will just use SRTM-3 and use proper slope... it should be safer?
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