[Proj] Rectified Skew Orthomorphic...

[Michael Childs]

I am trying to use Proj4 v4.4.9 to implement RSO support as described below
from a 2004 thread, but it does not appear that the changes discussed in the
thread ever made it into Proj4. Am I missing something or did these changes
never get made? Does anyone have a copy of the code that implemented the
'gamma_c' parameter for the 'omerc' projection?
 
Thanks,
 
Mike
Global Mapper Software LLC
mike at globalmapper.com
 
-------------------------------------
 
An update:
 
The forward script:
 
opts="+proj=omerc +a=6377298.556 +rf=300.8017 +lat_0=4 +lonc=115 \
   +alpha=53d18'56.9537 +gamma_c=53d7'48.3685 +k_0=0.99984 \
   +x_0=590476.87 +y_0=442857.65"
 
replicates the example for Borneo in EPSG #7 and
 
opts="+proj=omerc  +a=6378206.4 +es=.006768657997291094 \
+k=.9999 +lonc=-133d40 +lat_0=57 +alpha=-36d52'11.6315 \
+x_0=818585.5672270928 +y_0=575219.2451072642 +units=us-ft"
 
replicates the fortran version of gctp to 0.0005 us-ft.
 
You can see that +gamma_c is the only difference in the usage.
 
I would appreciate Malaysia specs and bench values as well as more
bench values for Borneo.
 
Thanks.
 
About another weeks work to check inverse and other options and
clean up documentation.

 

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