geod does not output decimeter, centimeter or milimeter distances

[kbevers]

I shall explain by example:

C:\dev\build\proj>echo 68.719315436111117 -52.793336961111109 68.719314987800004 -52.793337262100003 | bin\Release\geod.exe -I +ellps=GRS80 +units=m
-166d17'38.046" 13d42'21.953"   0.051

C:\dev\build\proj>echo 68.719315436111117 -52.793336961111109 68.719314987800004 -52.793337262100003 | bin\Release\geod.exe -I +ellps=GRS80 +units=dm
-166d17'38.046" 13d42'21.953"   0.051

C:\dev\build\proj>echo 68.719315436111117 -52.793336961111109 68.719314987800004 -52.793337262100003 | bin\Release\geod.exe -I +ellps=GRS80 +units=cm
-166d17'38.046" 13d42'21.953"   0.051

C:\dev\build\proj>echo 68.719315436111117 -52.793336961111109 68.719314987800004 -52.793337262100003 | bin\Release\geod.exe -I +ellps=GRS80 +units=mm
-166d17'38.046" 13d42'21.953"   0.051

Here I would expect the third value to change with each call to geod. Other units suchs as US feet works as expected:

(posetta) C:\dev\build\proj4>echo 68.719315436111117 -52.793336961111109 68.719314987800004 -52.793337262100003 | bin\Release\geod.exe -I +ellps=GRS80 +units=us-ft
-166d17'38.046" 13d42'21.953"   0.169

I am okay with geod not being able to convert to dm, cm or mm but right now the application advertises that it can do it:

C:\dev\build\proj4>bin\Release\geod.exe -lu
          km 1000.                Kilometer
           m 1.                   Meter
          dm 1/10                 Decimeter
          cm 1/100                Centimeter
          mm 1/1000               Millimeter
         kmi 1852.0               International Nautical Mile
          in 0.0254               International Inch
          ft 0.3048               International Foot
          yd 0.9144               International Yard
          mi 1609.344             International Statute Mile
        fath 1.8288               International Fathom
          ch 20.1168              International Chain
        link 0.201168             International Link
       us-in 1./39.37             U.S. Surveyor's Inch
       us-ft 0.304800609601219    U.S. Surveyor's Foot
       us-yd 0.914401828803658    U.S. Surveyor's Yard
       us-ch 20.11684023368047    U.S. Surveyor's Chain
       us-mi 1609.347218694437    U.S. Surveyor's Statute Mile
      ind-yd 0.91439523           Indian Yard
      ind-ft 0.30479841           Indian Foot
      ind-ch 20.11669506          Indian Chain

The problem is likely to originate in the "1/x" conversion factor values. The us-in unit follows this pattern at least.

[cffk]

This should be straightforward to fix. geod should just use the double factor field of PJ_UNITS, instead of decoding the check* to_meter field. I'll take a crack at this.