Coordinates difference between ABRIS & ME

[REL]

Hey Guys

Is there a way to calculate the Coordinates difference between ABRIS and the mission editor map or F10 map?

[zdXu]

The ABRIS shows your actual helicopter coordinates.

The mission editor shows the actual coodinates of your cursor in the bottom-corner or in the upper-corner of the screen.

[REL]

THX zdXu but perhaps I didn’t explained myself well.

If I place a Fix Point in the mission editor on a bridge the same fix point actually placed else ware on the ABRIS map.

That placement error is exactly what I’m trying to compensate for.

[ericinexile]

Yeah, that placement error is the reason I've stopped caring about the INS update. To understate, the DCS ME Map needs a "little" work.

[REL]

OK guys this is the solution:

To compensate for this error we need to place the object 850 meter to the east and 130 meter south on the mission editor map

8=)

[McVittees]

The reason for the mismatch is the ME doesn't account for the curviture of the earth and the game world does. I suspect, that the compensation values you have given will not apply to every location on the ME map. There have been a few threads on this subject and in one a formula for converting the coordinates from the ME to in-world (for the ABRIS) is given.

[Martillo1]

Trigonometrics? I think I should look for my good ol HP-28S :doh:

[REL]

The reason for the mismatch is the ME doesn't account for the curviture of the earth and the game world does. I suspect, that the compensation values you have given will not apply to every location on the ME map. There have been a few threads on this subject and in one a formula for converting the coordinates from the ME to in-world (for the ABRIS) is given.

I see...

I couldn’t find this coordinate’s converting formula

Maybe someone else can help me trace it?

[McVittees]

I can't find the conversion formula I refered to earlier - I think I may have mistaken a thread about converting co-ordinate formats between the PVI-800 and ABRIS here:

 

http://forums.eagle.ru/showthread.php?t=36197&highlight=mission+editor+coordinates

 

Anyways, here's what Evibiol had to say on the whole co-oridinates falt/round world thing:

 

http://forums.eagle.ru/showthread.php?p=484281

 

Sorry it took longer to get a more "official" response, but I wanted to make sure we provide accurate information.

 

In the current engine, the terrain model remains flat. However, as you can see in the ME screenshot, ED is developing a spherical terrain model for the new engine. Currently, the spherical ME map and the in-game terrain model are matched through a coordinate conversion system.

 

In regards to satellite trajectories, the flat terrain engine does not impact their proper orbital mechanics. Because the satellites are not currently used by any other game objects and are not drawn by the graphics engine, they do not operate in the same coordinate system.

Satellite coordinates are only needed to calculate the azimuth and elevation angles of the satellites for the purpose of displaying their position in the ABRIS sky plot and to determine the Dilution of Precision (DOP) parameters, which affect accuracy (the closer the satellites are grouped together, the higher the DOP value, the lower the accuracy).

The position of every satellite is calculated using the WGS84 reference system. It is determined using orbital parameters (3 + 3) and absolute in-game time (DD-MM-YYYY HH:MM:SS) with the same accuracy as the real GPS receiver calculates satellite positions using almanac data. The player’s helicopter position is converted from in-game coordinates into a geographical position (lat/long/geodetic height), then into the WGS84 system. The vector to the satellite is then calculated and used in determining the DOP. Finally, it is converted into horizontal coordinates (azimuth, elevation, range) to be displayed on the ABRIS sky plot.

 

Essentially - the satellites operate in their own, proper coordinate system and all that is required of the game engine is to convert the player's position (i.e. the position of the GPS receiver) into their coordinate system to perform all of the necessary calculations.

 

Not at this time. I don't know if there are any plans for this.

 

Something I have been wishing for as well, but have not seen in any plans. I'll forward the request.

 

Apologies if I raised your hopes!:doh:

[REL]

I can't find the conversion formula I refered to earlier - I think I may have mistaken a thread about converting co-ordinate formats between the PVI-800 and ABRIS here:

 

http://forums.eagle.ru/showthread.php?t=36197&highlight=mission+editor+coordinates

 

Anyways, here's what Evibiol had to say on the whole co-oridinates falt/round world thing:

 

http://forums.eagle.ru/showthread.php?p=484281

 

 

 

Apologies if I raised your hopes!:doh:

 

Never mind ....

Thank you anyway 8=)

[Martillo1]

So, the INS fixing procedure is useless :(

[Esac_mirmidon]

Until this feature is corrected in near future.

[dsobbe]

Yes, but in the mean time can the PVI convert dollars to yen?

[trujillostm]

I think the game must be in UTM coordinates in Abris and F10 map.

[Frederf]

So, the INS fixing procedure is useless :(

 

I think placing an INS Fix point in the ME will make a proper INS Fix point in the 3D game because there is a software conversion that happens so the INU update point is accurate and works... not that it's needed as there is no INU drift modeled.

 

The only problems are non-automatic processes (e.g. writing down coordinates from ME on a piece of paper and expecting it to be the same spot in the 3D game). I think this is what's happening, please correct me if I'm wrong.