ccplot中的地图投影

引言

在可视化CALIPSO、MODIS、CloudSat数据时，由于地图投影的变形问题，选择不合适的投影方式会造成数据可视化后变形巨大。这篇博文针对ccplot提供的地图投影函数绘图，为后续选择合适的投影可做参考。

ccplot中的地图投影方式

命令 地图投影方式 aeqd Azimuthal Equidistant poly Polyconic gnom Gnomonic moll Mollweide tmerc Transverse Mercator nplaea North-Polar Lambert Azimuthal gall Gall Stereographic Cylindrical mill Miller Cylindrical merc Mercator stere Stereographic npstere North-Polar Stereographic vandg van der Grinten laea Lambert Azimuthal Equal Area mbtfpq McBryde-Thomas Flat-Polar Quartic sinu Sinusoidal spstere South-Polar Stereographic lcc Lambert Conformal npaeqd North-Polar Azimuthal Equidistant eqdc Equidistant Conic cyl Cylindrical Equidistant aea Albers Equal Area spaeqd South-Polar Azimuthal Equidistant ortho Orthographic cass Cassini-Soldner splaea South-Polar Lambert Azimuthal robin Robinson

aeqd Azimuthal Equidistant poly Polyconic

gnom Gnomonic

moll Mollweide

tmerc Transverse Mercator

nplaea North-Polar Lambert Azimuthal gall Gall Stereographic Cylindrical mill Miller Cylindrical

merc Mercator

stere Stereographic

npstere North-Polar Stereographic

vandg van der Grinten

laea Lambert Azimuthal Equal Area mbtfpq McBryde-Thomas Flat-Polar Quartic sinu Sinusoidal

spstere South-Polar Stereographic

lcc Lambert Conformal

npaeqd North-Polar Azimuthal Equidistant eqdc Equidistant Conic

cyl Cylindrical Equidistant

aea Albers Equal Area

spaeqd South-Polar Azimuthal Equidistant ortho Orthographic

cass Cassini-Soldner

splaea South-Polar Lambert Azimuthal robin Robinson

总结

这里只是简单的将不同投影用同一套数据run了一下，实际做图时，根据swath所在位置选择合适的投影方式。关于投影还有不少参数可以设置（设置投影的范围），后续会陆续补充。