Parent Topic: PROJECTIONS

UPS

 Projection     : Universal Polar Stereographic
 General class  : azimuthal
 Characteristics: conformal
                : rectangular coordinates
 Earth model    : only supported ellipsoids or spheres
                  (i.e. E000 to E019)

Universal Polar Stereographic projection requires a zone to be specified or a sample point in geographic coordinates from which a zone can be derived. If a zone is specified it would be in the MAPUNITS string. Any of the following are valid:

Defining the MAPUNITS:

 EASI>mapunits="ups z"     ! Standard name and zone
 EASI>mapunits="ups z e0"  ! Standard name, zone, and ellipsoid

If the zone is not defined in the MAPUNITS string, a sample point can be input with PROLONG and PROLAT. For example:

 MapUnits            "ups"
 TrueOriginLongitude "117 w"
 TrueOriginLatitude  " 84 n"

If the UPS zone, PROLONG and PROLAT are not defined, but (BX1 and BY1) or (BX2 and BY2) define 'LONG/LAT' point(s), one of these can be used to derive the UPS zone. (If both (BX1 and BY1) and (BX2 and BY2) are defined, (BX1 and BY1) is used.)

If the UPS zone is derived from a sample point and the longitude for the point is shared between zones, the eastern-most zone is returned. For example, if prolong="0 w" and prolat="84 n", the assumed zone is UPS zone Z, not UPS zone Y. Any confusion can be avoided, by picking a sample point in the zone and not on the zone border.

Other parameters: None

Possible errors:

 E331, "Invalid earth model defined for the projection"

In setting up for the projection, the earth model is not in the range of E0 to E19 and is defined explicitly with the ELLIPS parameter. E108, "Option not available"
In setting up for the projection, the UPS zone is not A, B, Y or Z.

Parent Topic: PROJECTIONS
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