Question:

How do I create map projections with Ferret?

Examples:

McBryde-Thomas flat polar parabolic	orthographic

Explanation:

Map projection scripts released with Ferret take advantage of the 3 argumentSHADE and FILL commands which were introduced with the Version 4.9 release of Ferret. The scripts are described in the V4.9 release notes.

Solution:

To see a demonstration of the map projection capabilities you can run the map projection demo script:

yes? go mp_demo

To list the map projection scripts including the utility scripts, from the Unix command line:

% Fgo mp
line_samples.jnl: draw examples of the line styles used by the PLOT command
mp_annotate.jnl:  write text on a predefined map projection. 
mp_aspect.jnl:  Calculate the appropriate aspect ratio
mp_aspect.jnl.bak:  Calculate the appropriate aspect ration
mp_bonne.jnl:  Sets up variables for a Bonne map of the world
mp_craster_parabolic.jnl:  Sets up variables for a Craster Parabolic map of the world
mp_demo.jnl: demo of map projection scripts, including
mp_eckert_greifendorff.jnl:  Sets up variables for a Eckert-Greifendorff map of the world
mp_eckert_iii.jnl:  Sets up variables for a Eckert III map of the world
mp_eckert_v.jnl:  Sets up variables for a Eckert V map of the world
mp_fland.jnl: Plot or overlay an area-filled map of the continents
mp_graticule.jnl:  Overlay a graticule on a map.
mp_graticule_limit.jnl:  Overlay a graticule on a map, limited by a range of x and
mp_graticule_limit.jnl.bak:  Overlay a graticule on a map, limited by a range of x and
mp_grid.jnl:  Associates a data grid with a predefined map projection. 
mp_hammer.jnl:  Sets up variables for a Hammer map of the world
mp_label.jnl:  Place a label on a map projection using user coordinates
mp_lambert_cyl.jnl:  Sets up variables for a Lambert Cylindrical Equal Area map of the world
mp_land.jnl: Plot outlines of continents, countries, and/or states
mp_land_detail.jnl: Plot outlines of continents, countries, and/or states
mp_land_stripmap.jnl:  This journal file is not "nice" and is provided as an example only.
mp_line.jnl:  Plots data using a predefined map projection. 
mp_mask_outline.jnl: For a plot using map projections, define a contour field with 
mp_mcbryde_fpp.jnl:  Sets up variables for a McBryde-Thomas Flat-Polar Parabolic map of the world
mp_mercator.jnl:  Sets up variables for a Mercator projection
mp_ocean_stripmap.jnl:  This journal file is not "nice" and is provided as an example only.
mp_orthographic.jnl:  Sets up variables for a Orthographic map of the world
mp_plate_caree.jnl:  Sets up variables for a Plate Caree map of the world
mp_poly_vectors.jnl: 
mp_polyconic.jnl:  Sets up variables for a Polyconic map of the world
mp_polymark.jnl:  Plot polygons using a predefined map projection. 
mp_polytube.jnl:  Plot a colored tube using a predefined map projection. 
mp_polytube_bent.jnl:  Plot a colored tube using a predefined map projection. 
mp_rotate.jnl:  Sets up variables for a Rotated map of the world
mp_sinusoidal.jnl:  Sets up variables for a Sinusoidal map of the world
mp_stereographic_eq.jnl:  Sets up variables for a Stereographic Equatorial map of the world
mp_stereographic_north.jnl:  Sets up variables for a Stereographic North map of the world
mp_stereographic_south.jnl:  Sets up variables for a Stereographic South map of the world
mp_tics.jnl: 
mp_trackplot.jnl:  Plot a trackplot using a predefined map projection. 
mp_vertical_perspective.jnl:  Sets up variables for a Vertical Perspective map of the world
mp_viewport_aspect.jnl:  Define a viewport for plotting map projections
mp_wagner_vii.jnl:  Sets up variables for a Wagner VII map of the world
mp_winkel_i.jnl:  Sets up variables for a Winkel I map of the world
test_mp_land.jnl: 
test_mp_land_detail.jnl: