I helped someone before with this but I can't find the tread..
OK, for one you have to turn around your coordinates,
You have [52.2008516 8.3862769]
Should be: [8.3862769 52.2008516]
Change them all and let me know if it works, there can be more things wrong 
For my country I do not see difference, even if I zoom in all the way.
But that does not say anything, man have to get this into FSET to do a real test.
[Blocked Image: https://myalbum.com/photo/fkEFxwZ1eGqS/360.jpg]
It will be better than the default scenery but for level 14 you better use -1
Or maybe better, you do the levels 9 and 11 with that big chunk you have and download
a new small -1 one around the airport and do 12-13-14-15 with that.
I tried 1.06, really easy now I don't have to move all tif files around anymore
Now I did it on my second computer with only 16GB ram so GeoConvertor got the error but I knew that was going to happen.
The helper did it's job perfectly, thanks!!
Imagine your on high altitude, there you will see only level 9, you descent to an airport, the lower you go the more detail
scenery you will see; level 11... lower 12 kicks in etc. at 1000 feet it gets really detailed, your on level 14 now, just before touchdown
you see level 15. That is the idea about FS2's levels. the bigger the level number the more detail thus the more Gb's.
So it is recommended to do more than one level but I doubt if FSET level 3 is enough for the higher FS2 GeoConvert levels.
Thanks Uwe!!
I'm still using 1.01 
This tool is very stable, this one is..
Later today when my current proces is finished I will switch to 1.06
I have a lot of Tifs in the next one.
Ich verwende den Vive, I will check later, my FS2 computer is GeoConverting...
There is a solution around this.
A while ago I already changed the location of my Documents folder from my SSD (C) to D\
I use 'GeoConvert Helper' so I have no controle over what area I convert, it just converts the FSET area.
Having said that.... no, I'll show you with rectangles
Maybe I overdone the overlap in this drawing, the black tiles occurred around red tiles 1 & 2
but are gone since I did the yellow one.
I'm now re-downloading the yellow one FSET res 1. when thats ready in a few days.. results and screenshots.
[Blocked Image: https://myalbum.com/photo/pdG2fvkE5trr/360.jpg]
I downloaded my whole country low resolution an converted it only level 9.
I left mij level 9-11-12-13-14 smaller overlapping areas in and I do not see any black tiles anymore.
?????
I think I re-convert my smaller area's without level 9 now.
Something is wrong with the memory management of the GeoConverter, IPACS is working on a solution.
First time I hear of problems with the Helper, maybe check your files, empty folders etc.
Many people want answers on the questions you ask, maybe IPACS is wondering too.
I have black boxes outside two overlapping areas, it makes no sense.
Why is that? What are the right settings?
I surely think to know some people around here were talking about special American textures..
Yes but it's not working 
ServiceName = Amerika
ServiceCodeing = xyz
ServiceUrl =http://us.maps3.yimg.com/aerial.maps.yimg.com/img?%s&v=1.8&t=a=
Referer = http://us.maps3.yimg.com/
UserAgent = Mozilla/4.0
#ServerVariations = khm0,khm1,khm2,khm3
Thanks for the tip.
Found it and it's indeed simple.
Also put in the American server.
I have a problem with military bases in the Netherlands, Virtual Earth - pixeled out, google earth some tiles not found.
Do more servers exist?
Is there a way that FSET keeps it's settings?
Every time I open it I have to set the resolution and the no-no-no etc. ??
That went well, now to not forget I made a second an third airport, the third had two runways so I expanded the tsc with
endpoint 3 and 4, also threshold an name, that was wrong, you have to copy and paste the whole section and give the
runway element number 1, were the first runway is 0, looks like this:
<[list_tmsimulator_runway][runways][]
<[tmsimulator_runway][element][0]
<[vector2_float64][endpoint1][4.9499577 51.5653731]>
<[vector2_float64][endpoint2][4.9136835 51.5694479]>
<[vector2_float64][threshold1][4.9499577 51.5653731]>
<[vector2_float64][threshold2][4.9136835 51.5694479]>
<[float64][width][20]>
<[string8][name1][28]>
<[string8][name2][10]>
<[string8][appltsys1][malsr]>
<[string8][appltsys2][malsr]>
<[string8][papi1][left]>
<[string8][papi2][left]>
<[string8][reil1][none]>
<[string8][reil2][none]>
>
<[tmsimulator_runway][element][1]
<[vector2_float64][endpoint1][4.9417555 51.5718752]>
<[vector2_float64][endpoint2][4.9337304 51.5565688]>
<[vector2_float64][threshold1][4.9417555 51.5718752]>
<[vector2_float64][threshold2][4.9337304 51.5565688]>
<[float64][width][20]>
<[string8][name1][20]>
<[string8][name2][02]>
<[string8][appltsys1][malsr]>
<[string8][appltsys2][malsr]>
<[string8][papi1][left]>
<[string8][papi2][left]>
<[string8][reil1][none]>
<[string8][reil2][none]>
I did my last airport on level 15 only on top of the area and looks a little better than yours (Buzzard)
I only have difficulties landing because it looks like it's build on de seven hills of Rome.
And I'm from the flattest land on the world! 
Ik guess that's also part of future airport building.
I got to be a master of making 3D things for my 3D printer but those 4 part screen programs I totally forgot how they work.
I Hope I can import from my own program, e.g. bgl.
Congratulations !!
