Lambert conformal conic 2SP variant only supports definitions with two standard parallels but uses the same algorithm as the Lambert conformal conic variant.It is available in ArcGIS Pro 2.6 and later and in ArcGIS Desktop 10.8.1 and later. Lambert conformal conic 1SP variant only supports definitions with one standard parallel and scale factor but uses the same algorithm as the Lambert conformal conic variant.It is available in ArcGIS Pro 1.0 and later and in ArcGIS Desktop 8.0 and later. Lambert conformal conic variant is a general variant supporting all possible parameters for the projection.There are three variants available in ArcGIS: The state plane coordinate system uses the Lambert conformal conic projection for zones that have a predominant east-west extent. Typically, the standard parallels are placed at one-sixth of the latitude range below the top and above the bottom of the area to be mapped. The Lambert conformal conic projection is best suited for conformal mapping of land masses in mid-latitudes extending in an east-to-west orientation rather than those trending north-to-south.
The projection is not conformal at the poles. Scale, area, and distances are increasingly distorted away from the standard parallels, but they are the same along any given parallel and symmetric across the central meridian.
Distances are accurate only along the standard parallels. Directions, angles, and shapes are maintained at infinitesimal scale. Lambert conformal conic is a conformal map projection. The graticule is symmetric across the central meridian. When the standard parallels are set in the northern hemisphere, the fan-shape of the graticule is oriented up and when standard parallels are in the southern hemisphere, the fan-shape of the graticule is oriented down. The other pole projects to infinity and cannot be shown. Their spacing increases away from the standard parallels. The parallels are represented as circular arcs centered on the pole. All the meridians are equally spaced straight lines converging to a common point, which is the nearest pole to the standard parallels. Lambert conformal conic is a conic projection. The subsections below describe the Lambert conformal conic projection properties. The Lambert conformal conic projection is shown with standard parallels on the northern hemisphere (left) and southern hemisphere (right). The state plane coordinate system uses it for all zones that have a predominant east-west extent.īoth spherical and ellipsoidal forms of the Lambert conformal conic map projection were developed by Johann H. This projection was rarely used before the First World War but is now commonly used for official topographic mapping around the world. It is best suited for conformal mapping of land masses extending in an east-to-west orientation at mid-latitudes. The Lambert conformal conic map projection is typically based on two standard parallels, but it can also be defined with a single standard parallel and a scale factor.
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