Map Projection Compound Widget:

The map projection parameter values can be saved to and loaded from an ASCII parameter file.  This ASCII map projection parameter file can be used in programs:  bl1map,bl2map, bl3map, mapimg and for loading SeaWiFS L3-binned products.

Map Projection Inputs:

Projections	Select the desired projection.  (currently the Satellite projection is not available)
Center Lat/Lon	Center latitude and longitude of the projection.  Value 999.0 denotes taking the default.  (Some defaults can be projection-dependent).
Rotation	The angle through which the North direction should be rotated around the line L between the earth's center and the point specified in Center Lat/Lon.
Projection-dependent entries	Central Azimuth Only available for Cylindrical, Mercator, Miller, Mollweide and Sinusoidal projections. Standard Parallels  Only available for the 2 conic projections: Lambert and Albers.  A one or two-element array defining the standard parallels. Ellipsoid Only available for Transverse Mercator projection.  A 3-element array, [a, e^2, k], defining the ellipsoid.  The default is the Clarke 1866 ellipsoid. a: equatorial radius (m.) e^2: eccentricity squared (m.) k: scale on the central meridian
Unset Scale, Set Scale	A toggle specifying whether or not to specify the scale of the map projection or the limits.  Scale and Limits are mutually exclusive.
Scale	If Set Scale is specified, then the map generated will be an isotropic map of the ratio 1:scale and the resultant implicit limits will depend on the Output Size specified by the user.  The default is 1:100 million which is equivalent to (1 cm to 1000 km) or (1 inch to 1578 miles).
Lat Limit (South, North)	The latitude limits of the map.
Lon Limit (West, East)	The longitude limits of the map.
Isotropic	(Note: If Set Scale if specified, then the resultant map will automatically be isotropic.)   Isotropic off  The map projection will stretch to fit the size specified in Output Size.  This means that the scales in the X & Y directions will most likely be different. Isotropic on The map produced will have the same scale in the X and Y directions.  This means that the map will not be stretched to fit the Output Size and that consequently there will be an unmapped area on either the top and bottom or left and right of the map.
Output Size	The output size in pixels of the desired map [xsize, ysize].
Output Region	The region within the Output Size to dedicate to map generation, in normalized coordinates.  The default is to fill the entire area specified by Output Size.   Bot-L. The normalized [x,y] coordinates of the bottom-left corner of the mapping region.  Default is [0.0,0.0]. Top-R. The normalized [x,y] coordinates of the top-right corner of the mapping region.  Default is [1.0, 1.0].
Parameter file	The name of an ASCII file which contains the desired map projection keyword values.   Load Load the map projection keywords from the parameter file specified in Parameter file. Save Save the entered map projection keywords to an ASCII map projection parameter file.