GEMPAK Projection Examples

Unidata - To provide the data services, tools, and cyberinfrastructure leadership that advance Earth system science, enhance educational opportunities, and broaden participation.

DataToolsCommunityDownloadsSupportProjectsAbout Us

•

13.0 GEMPAK Projection Examples

Map projections can be chosen based on the desired map properties. For example:

Orthographic projection is used to repesent the Earth as viewed from infinity.
GAREA = 0;-105;0;-105
PROJ = ort/50;-105;0

The cylindrical projection can be rotated to view both poles at the same time.
GAREA = 0;0;0;0
PROJ = ced/0;-105;45

Any straight line drawn on a Gnomic map is on a great circle, and can be used to find the shortest path between two points. Gnomic is often useful for ocean and seismic waves which tend to travel along great circles.
GAREA = -10;145;60;-80
PROJ = gno/21;-157;0

GEMPAK Online Tutorial > GEMPAK Projections

Contact Us • Site Map • Search • Terms and Conditions • Privacy Policy • Participation Policy

Unidata is a member of the UCAR Office of Programs, is managed by the University Corporation for Atmospheric Research, and is sponsored by the National Science Foundation.

P.O. Box 3000 • Boulder, CO 80307-3000 USA • Tel: 303-497-8643 • Fax: 303-497-8690

Orthographic projection is used to repesent the Earth as viewed from infinity. GAREA = 0;-105;0;-105 PROJ = ort/50;-105;0
The cylindrical projection can be rotated to view both poles at the same time. GAREA = 0;0;0;0 PROJ = ced/0;-105;45
Any straight line drawn on a Gnomic map is on a great circle, and can be used to find the shortest path between two points. Gnomic is often useful for ocean and seismic waves which tend to travel along great circles. GAREA = -10;145;60;-80 PROJ = gno/21;-157;0