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Near-sided perspective

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The near-sided perspective projection simulates a view from a height +\(h\) similar to how a satellite in orbit would see it.

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Classification

Azimuthal. Neither conformal nor equal area.

Available forms

Forward and inverse spherical projection

Defined area

Global, although for one hemisphere at a time.

Alias

nsper

Domain

2D

Input type

Geodetic coordinates

Output type

Projected coordinates

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+Near-sided perspective +
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proj-string: +proj=nsper +h=3000000 +lat_0=-20 +lon_0=145

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Parameters

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Required

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++h=<value>
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Height of the view point above the Earth and must be in the same units as +the radius of the sphere or semimajor axis of the ellipsoid.

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Optional

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++lon_0=<value>
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Longitude of projection center.

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Defaults to 0.0.

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++lat_0=<value>
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Latitude of projection center.

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Defaults to 0.0.

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++R=<value>
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Radius of the sphere, given in meters. If used in conjunction with ++ellps, +R takes precedence.

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See Ellipsoid size parameters for more information.

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++x_0=<value>
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False easting.

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Defaults to 0.0.

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++y_0=<value>
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False northing.

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Defaults to 0.0.

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