Projection Specifications¶
GMT offers 31 map projections. These are specified using the -J common option. There are two conventions you may use: (a) GMT-style syntax and (b) PROJ-style syntax. The projection codes for the GMT-style and the PROJ-style are tabulated below.
GMT PROJECTION CODES |
PROJ PROJECTION CODES |
|
|---|---|---|
-J (upper case for width, lower case for scale) |
-J (lower case for scale only) |
|
-JAlon0/lat0[/horizon]/width |
-Jlaea/lon0/lat0[/horizon]/scale |
Lambert azimuthal equal area … |
-JBlon0/lat0/lat1/lat2/width |
-Jaea/lon0/lat0/lat1/lat2/scale |
Albers conic equal area … |
-JClon0/lat0/width |
-Jcass/lon0/lat0/scale |
Cassini cylindrical … |
-JCyl_stere/[lon0[/lat0/]]width |
-Jcyl_stere/[lon0[/lat0]/]scale |
Cylindrical stereographic … |
-JDlon0/lat0/lat1/lat2/width |
-Jeqdc/lon0/lat0/lat1/lat2/scale |
Equidistant conic … |
-JElon0/lat0[/horizon]/width |
-Jaeqd/lon0/lat0[/horizon]/scale |
Azimuthal equidistant … |
-JFlon0/lat0[/horizon]/width |
-Jgnom/lon0/lat0[/horizon]/scale |
Azimuthal gnomonic … |
-JGlon0/lat0[/horizon]/width |
-Jortho/lon0/lat0[/horizon]/scale |
Azimuthal orthographic … |
-JGlon0/lat0/alt/azim/tilt/twist/W/H/width |
-Jnsper/lon0/lat0/alt/azim/tilt/twist/W/H/scale |
General perspective … |
-JH[lon0/]width |
-Jhammer/lon0/scale |
Hammer equal area … |
-JI[lon0/]width |
-Jsinu/lon0/scale |
Sinusoidal equal area … |
-JJ[lon0/]width |
-Jmill/lon0/scale |
Miller cylindrical … |
-JKf[lon0/]width |
-Jeck4/lon0/scale |
Eckert IV equal area … |
-JKs[lon0/]width |
-Jeck6/lon0/scale |
Eckert VI equal area … |
-JLlon0/lat0/lat1/lat2/width |
-Jlcc/lon0/lat0/lat1/lat2/scale |
Lambert conic conformal … |
-JM[lon0[/lat0]/]width |
-Jmerc/[lon0[/lat0/]]scale |
Mercator cylindrical … |
-JN[lon0/]width |
-Jrobin/[lon0/]scale |
Robinson … |
-JOalon0/lat0/azim/width[+v] |
-Jomerc/lon0/lat0/azim/scale[+v] |
Oblique Mercator, 1: origin and azim … |
-JOblon0/lat0/lon1/lat1/width[+v] |
-Jomerc/lon0/lat0/lon1/lat1/scale[+v] |
Oblique Mercator, 2: two points … |
-JOclon0/lat0/lonp/latp/width[+v] |
-Jomercp/lon0/lat0/lonp/latp/scale[+v] |
Oblique Mercator, 3: origin and pole … |
-JPwidth[+a][+f[e|p|radius]][+roffset][+torigin][+z[p|radius]] |
-Jpolar/[+a][+f[e|p|radius]][+roffset][+torigin][+z[p|radius]] |
Polar [azimuthal] (\(\theta, r\)) (or cylindrical) |
-JPoly[lon0[/lat0]/]width |
-Jpoly/[lon0[/lat0/]]scale |
(American) polyconic … |
-JQ[lon0[/lat0/]]width |
-Jeqc/[lon0[/lat0/]]scale |
Equidistant cylindrical … |
-JR[lon0/]width |
-Jwintri/[lon0/]scale |
Winkel Tripel … |
-JSlon0/lat0[/horizon]/width |
-Jstere/lon0/lat0[/horizon]/scale |
General stereographic … |
-JT[lon0[/lat0]/]width |
-Jtmerc/[lon0[/lat0/]]scale |
Transverse Mercator … |
-JUzone/width |
-Jutm/zone/scale |
Universal Transverse Mercator (UTM) … |
-JV[lon0/]width |
-Jvandg/[lon0/]scale |
Van der Grinten … |
-JW[lon0/]width |
-Jmoll/[lon0/]scale |
Mollweide … |
-JXwidth[l|pexp|T|t][/height[l|pexp|T|t]][d] |
-Jxyxscale[l|pexp|T|t][/yscale[l|pexp|T|t]][d] |
Linear, log\(_{10}\), \(x^a-y^b\), and time … |
-JYlon0/lat0/width |
-Jcea/lon0/lat0/scale |
Cylindrical equal area … |