Re: File format question

--===============0232967698==
Content-Type: text/plain; charset=ISO-2022-JP
Content-Transfer-Encoding: 7bit

Hi,

Thanks for the pointers Ralf and Paul;

Ralf Gerlich wrote:

>It means that you need to project them to WGS84 (World Geodetic System 
>of 1984), which is the datum used by TerraGear and FlightGear. This 
>could be done using a small perl script and proj4.
>  
>
I played around with proj4 a bit, and I'm hoping I did this correct.
I picked a random coordinate from the data I made, and passed it thro'
cs2cs:

random data:
502429.000000, 127637.000000, 75

converted the long and lat to degrees by /3600:
139.56361111111113 35.454722222222223

piped them thro cs2cs:
$ echo "139.56361111111113 35.454722222222223"|cs2cs +proj=longlat
+ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs
139d33'49"E 35d27'17"N 0.000

Converted them back to degrees:
(49/60 + 33)/60 + 139
= 139.5636111111111
and
(17/60 + 27)/60 + 35
= 35.454722222222223

And I seem to get the same numbers as the original data (well, close
enough). Does this mean that my data is already in WGS84? Or did I do
something wrong with the cs2cs parameters?

From here, I guess I need to somehow convert the data to a USGS DEM
format so the TerraGear tools can do it's magic. Tho, I haven't figured
out an easy way to do that yet...


Cheers,
Vik



--===============0232967698==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
Terragear-devel mailing list
[email protected]
http://mail.flightgear.org/mailman/listinfo/terragear-devel
2f585eeea02e2c79d7b1d8c4963bae2d
--===============0232967698==--