Note
Click here to download the full example code
General Perspective¶
The general perspective projection imitates the view of the Earth from a finite point in space. In a full view of the earth one third of its surface area can be seen.
lon0/lat0/altitude/azimuth/tilt/twist/Width/Height/scale
or width
lon0/lat0
specifies the projection center, altitude
the height
in km of the viewpoint above local sea level (If altitude is less than 10,
then it is the distance from the center of the earth to the viewpoint in earth
radii). With azimuth
the direction (in degrees) in which you are looking is
specified, measured clockwise from north. tilt
is given in degrees and is the
viewing angle relative to zenith. A tilt of 0° is looking straight down, 60° is
looking 30° above horizon. twist
is the clockwise rotation of the image (in
degrees). Width
and Height
describe the viewport angle in degrees.
The example shows the coast of northern europe viewed from 250 km above sea level looking 30° from north at a tilt of 45°. The height and width of the viewing angle is both 60°, which imitates viewing with naked eye.
Out:
<IPython.core.display.Image object>
import pygmt
fig = pygmt.Figure()
fig.coast(
projection="G4/52/250/30/45/0/60/60/5i",
region="g",
frame=["x10g10", "y5g5"],
land="gray",
)
fig.show()
Total running time of the script: ( 0 minutes 2.835 seconds)