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Annotation of researchv10no/cmd/map/lox/README, revision 1.1.1.1

1.1       root        1: lox deg
                      2: computes a loxodrome inclined at angle "deg" from
                      3: the equator; deg=45 for NE, deg=-45 for SE.
                      4: The loxodrome begins at lat,lon=0,0 and continues
                      5: through north latitudes.  The output fields are:
                      6:        phi     latitude
                      7:        x       coord of developed loxodrome
                      8:        y       ditto
                      9:        theta   (east!) longitude of point on loxodrome
                     10:        chi     angle of inclination (slope) of developed loxodrome
                     11: Both theta and chi increase continuously (beyond 360)
                     12: 
                     13: map loxodromic deg options
                     14: draws a map based on the developed loxodrome.  The globe is
                     15: cut along the antipodal loxodrome and points are displayed
                     16: at true distance from the developed central loxodrome.
                     17: The usual map options apply.
                     18: Latitudes beyond 85 are deemed unplottable; higher latitudes
                     19: could be squeezed out in some instances.
                     20: 
                     21: sh dolox deg options
                     22: makes the map with the boundary cut drawn.
                     23: If option -o is present, it must be first, and it should be
                     24: -o 90 ? ?  (For uninvestigated reasons, the scale of an
                     25: off-axis projection comes out a bit wrong, so you have to
                     26: hand-tune the drawing of the boundaries, as has been done
                     27: in "sh noedge"; see the differing -p options there.  One
                     28: contributor to the discrepancy: linear interpolation.)
                     29: 
                     30: This projection uses the heavy artillery of a general
                     31: integrator and a general equation solver from the port 3
                     32: library.  This triples the size of the object code of map;
                     33: moreover it requires a corrected version of subroutine ds7grd,
                     34: not in the publicly available Port 3.  Hence the loxodromic 
                     35: projection is not normally included in "map".

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