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# Vertical Near-Side Perspective

Release 9.2

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Description

Unlike the Orthographic projection, this perspective projection views the globe from a finite distance. This perspective gives the overall effect of the view from a satellite.

Projection method

Planar perspective projection—viewed from a specified distance above the surface. All aspects are either circular or an area less than a full hemisphere.

• Polar aspect—meridians are straight lines radiating from the center, and the lines of latitude are projected as concentric circles that become closer toward the edge of the globe.
• Equatorial aspect—the central meridian and the equator are straight lines. The other meridians and parallels are elliptical arcs.

Point of contact

A single point located anywhere on the globe.

Linear graticules

• All aspects—the central meridian of the projection.
• Equatorial aspect—the equator.
• Polar aspect—all meridians.

Properties

### Shape

Minimal distortion near the center; maximal distortion near the edge.

### Area

Minimal distortion near the center; maximal distortion near the edge.

### Direction

True direction from the central point.

### Distance

The radial scale decreases with distance from the center.

Limitations

Limited to a view less than 90° from the central point.

Uses and applications

Uses of this projection are aesthetic more than technical. The most commonly used aspect for this purpose is the oblique.

Parameters

### Desktop

• False Easting
• False Northing
• Longitude of center
• Latitude of center
• Height

### Workstation

• Radius of the sphere of reference
• Height of perspective point above sphere
• Longitude of center of projection
• Latitude of center of projection
• False Easting (meters)
• False Northing (meters)
• Supported on a sphere only

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