You are here:
Map projections and coordinate systems
>
Supported map projections
Description
Gall's Stereographic was designed around 1855. It is a cylindrical projection with two standard parallels at latitudes 45° N and S.
Projection method
Cylindrical stereographic projection based on two standard parallels at 45° N and S. The globe is projected perspectively onto a secant cylinder from the point on the equator opposite a given meridian. Meridians are equally spaced straight lines. Parallels are straight lines with spacing increasing away from the equator. Poles are straight lines.
Lines of contact
Two lines at 45° N and S.
Linear graticules
All meridians and parallels.
Properties
Shape
Shapes are true at latitudes 45° N and S. Distortion slowly increases away from these latitudes and becomes severe at the poles.
Area
Area is true at latitudes 45° N and S. Distortion slowly increases away from these latitudes and becomes severe at the poles.
Direction
Locally correct at latitudes 45° N and S. Generally distorted elsewhere.
Distance
Scale is true in all directions along latitudes 45° N and S. Scale is constant along parallels and is symmetrical around the equator. Distances are compressed between latitudes 45° N and S and expanded beyond them.
Limitations
Used only for world maps.
Uses and applications
Used for world maps in British atlases.
Parameters
Desktop
- False Easting
- False Northing
- Central Meridian
- Supported on spheres only
Workstation
- Longitude of Central Meridian
- Supported on spheres only
Please visit the
Feedback page to comment or give suggestions on ArcGIS Desktop Help.
Copyright © Environmental Systems Research Institute, Inc.