- Fs2004 Srtm Global Terrain Map Of Usa
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The FSX terrain mesh is compiled to BGL format, as well as the other scenery files (for example 3d model + xml file telling the game its coordinates) The stock FSX comes with 38 meter mesh for the USA, 76 meter mesh for the Canada, Europe, Australia and New Zealand and Japan. Free AirMap, moving map for Prepar3D, Flightsimulator, X-Plane, FlightGear. FSX, FS2004, X-Plane available. Dragon stop motion mac serial number. Now with terrain overlay support. December 2015. Build 4.0.0.7 for P3D, FSX, FS2004, X-Plane available. October 2015. Test drive unlimited 1 full. Shuttle Radar Topography Mission (SRTM) data are Earth surface remote sensing data recorded from space in the.
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This post is for Landscape creators , if you can understand this you will create a much more accurate and historical mapping which in turn helps texturing and any other process you do afterwards with the smrt data.
Sometime ago i found a website that had a different outlook on a problem thats been caused by missing data from the NASA SRTM hgt files.
You may all ready know this information ,but no harm in posting some results so we can all see the differences.
SRTM data is basically a Radar bouncing from a satellite towards earth and bounces back to the satellite , in the form of a height value called SRTM or hdr files or hgt files , height files.
The data is collected in squares called 'tiles' these tiles are then loaded into a program that joins all the tiles you have collected and presents you with a untextured height map or mesh or layer that once textured can be made into a flight sim map.
So what is Missing SRTM DATA ?
Issue 1
This issue starts with the satellite , when it transmits the radar signal the radio waves respond totally different when they come into contact with ICE and water and basically anything thats reflective like snow or a landscape thats wet from rainfall etc
Issue 2
The other issue with the satellite radar is the angle of which it transmitted the radar , the satellite is travelling very fast the data covered either a 3 second arc or a 1 second arc , which means if the radar was transmitted towards a steep walled valley in mountains the radar bounce did not always get bounced back to the satellite , or the steep valley hill side ment the radar did not bounce into the valley to recover the height and shape of the valley.
Or the radar passes over one steep walled side of the valley bounces of the opposite valley wall and the side of the valley wall it passed over was not hit by the radar , so the valley and one side are how missing data or Hole is created.
Combine both these issues and the problem becomes rather upsetting to map makers , especially if you are going to be making a HISTORICALLY Correct Map.
Flat areas can have the same results , because of rainfall ,snow,and weather system storms at the exact time the satellite passed over recording information, and of course the angel the radar was pointing at earth when it transmitted.
Ok , by now some mapmakers will be saying 3DEM and microdem and other programs fix this issue and you can load a map that has not got any missing data file areas because the program fixes it ….
Sorry but no. you are just fooling your self and below it an example that proves it.
3DEM is a program that you can load SRTM radar data into and it will convert the data into a visual terrain contour , the program DOES have the ability to fix the missing data with a unusual set of rules that it follows , basically a guess fix but with a generally good intention.
The results are never going to be high quality, its a fix not a correction.
The way 3DEM fixes this problem of missing data is to look at the height values of the edges of the missing data area some call these areas 'holes' and divides all the heights values of the rim with the distance circumference of the hole.
This means if you have a mountain and the nasa data is missing for the PEAK of this mountain , then 3DEM fills the missing patch with a make do patch a mathemathical equation that is not 100% perfect.
The mountain top will have a undulating bumpy, but basically flat top with no PEAK! , sometimes it actually can make a VALLEY instead of a mountain
Below is a screen shot of SRTM NASA DATA fixed using 3dem .
screenshot is from Concordia glaciar Valley looking towards K2 mountain on a Map i made just to show this example of fixing
Fs2004 Srtm Global Terrain Map Of Usa
missing data srtm files.The flight sim is Condor flight sim ( for Sailplanes / Gliders )
Now some would say , Whats wrong with that !
Ok , would you believe that NASA data files have a huge missing piece of data that is actually the whole K2 mountain , otherwords the K2 Mountain does not exist if you fix the missing data using 3Dem or microdem or any smrt data correction tool.
Fs2004 Srtm Global Terrain Map Of User
Below is the same photo snapshot with the K2 location visible
So 3Dem fixed the missing data area but it is not intelligent its just a mathemathical equation and a rough guess…
For those of you who fly IL-2 1946 flight game , this above photo is the quality you have been flying within for along time now , about 10 years , why ! , because the mapmakers did not know or thought it was fixed correctly by 3DEM / Microdem when it was a greyscale height map.
Not very good quality !
I hope Rise of Flight mapmakers , will produce far greater than this so i make this post to guide a correct direction.
Below is a snap shot from GOOGLE EARTH ! , the GOOGLE maping team realise that the programs that fix missing data files is incorrect so they have taken many many years to slowly rebuild the contours and shapes of the terrian to a fairly close to accurate effect.
Just to backup GOOGLE Earths accuracy below is a actual PHOTO from roughly the same location as all FOUR photos location within the Concordia glaciar Valley , sorry they are not exact tripod location but you can see the huge improvement Google earth created.
You can see that 3Dem fixed the missing data patch by deleting what should be visable and that google earth did a great job of rebuilding a famous landmark.
OK
Now the mapmakers from IL-2 and several other Flight sims MAKE the maps/scennery and use 3Dem or microdem to fix the patches in the missing data from the satelite smrt.files
Unfortunately the result is the FIRST TOP photo quality and the landscape is incorrect infact its totally wrong , for 10 years IL-2 mapmakers have been building maps inaccurate , and i DO NOT want it to happen in RISE OF FLIGHT !
Its historically correct and i think the map creation should follow the same path , so i hope the next photo you do not look at the COLOURS or texturing it is only a example ,
BUT !!
Look at the contours and shapes of the mountains and the peaks ! this is the example i am showing ,so map makers do not make incorrect landscape in the future of rise of flight.
compared with GOOGLE EARTH , i may be wrong but i think my terrain is better shaped, of course the real photo is much more better but the shapes and contours of the terrain are as good a quality that can be made with present day technology.
This last photo did not use 3dem patch fix to mend the missing data areas , it used ordinance survey data and topographic mapping and alot of skill by a very clever GROUP of people.
Anyone who in the future makes new maps either 3rd party of offical, please understand smrt data even if its NASA DATA does not mean its totally accurate , and 3DEM or microdem or any other data missing fix programs do not fix the terrain correctly , only a human touch can let the mountain be seen.
Fs2004 Srtm Global Terrain Map Of Use
I hope this is helpful to mapmakers ,
The url link below is to Corrected SRTM Data is not ALL of the world corrected only some parts but europe has some 1 arc second smrt data fixes as well as 3 arc second data fixes so please use it , and your results will be far greater quality , using corrected ordinance survey map values and topoghaphical mapping to fix the missing smrt data areas , so 3DEM does not have to FIX with a lower quality patchwork result.
http://www.viewfinde..s.org/dem3.html'>http://www.viewfinde..s.org/dem3.html
If you need help understanding this topic of smrt please post here and i will help all i can , because its for a good cause , and means we all fly in terrain thats the best quality.
Rise of Flight Developers
Thank you for creating a LANDSCAPE forum , i will make it my home
Best Regards
O_Wolfpac
![Fs2004 Srtm Global Terrain Map Of Us Fs2004 Srtm Global Terrain Map Of Us](/uploads/1/2/4/7/124787768/460100595.jpg)
Tony