CONICPROJ - Online Linux Manual PageSection : 1
Updated : 2020-11-22
Source : GeographicLib 1.51
Note : GeographicLib Utilities
NAMEConicProj −− perform conic projections
SYNOPSIS​ConicProj ( −c | −a ) lat1 lat2 [ −l lon0 ] [ −k k1 ] [ −r ] [ −e a f ] [ −w ] [ −p prec ] [ −−comment−delimiter commentdelim ] [ −−version | −h | −−help ] [ −−input−file infile | −−input−string instring ] [ −−line−separator linesep ] [ −−output−file outfile ]
DESCRIPTIONPerform one of two conic projections geodesics. Convert geodetic coordinates to either Lambert conformal conic or Albers equal area coordinates. The standard latitudes lat1 and lat2 are specified by that the −c option (for Lambert conformal conic) or the −a option (for Albers equal area). At least one of these options must be given (the last one given is used). Specify lat1 = lat2, to obtain the case with a single standard parallel. The central meridian is given by lon0. The longitude of origin is given by the latitude of minimum (azimuthal) scale for Lambert conformal conic (Albers equal area). The (azimuthal) scale on the standard parallels is k1. Geodetic coordinates are provided on standard input as a set of lines containing (blank separated) latitude and longitude (decimal degrees or degrees, minutes, seconds); for details on the allowed formats for latitude and longitude, see the GEOGRAPHIC COORDINATES section of GeoConvert (1). For each set of geodetic coordinates, the corresponding projected easting, x, and northing, y, (meters) are printed on standard output together with the meridian convergence ​gamma (degrees) and (azimuthal) scale k. For Albers equal area, the radial scale is 1/k. The meridian convergence is the bearing of the y axis measured clockwise from true north. Special cases of the Lambert conformal projection are the Mercator projection (the standard latitudes equal and opposite) and the polar stereographic projection (both standard latitudes correspond to the same pole). Special cases of the Albers equal area projection are the cylindrical equal area projection (the standard latitudes equal and opposite), the Lambert azimuthal equal area projection (both standard latitude corresponds to the same pole), and the Lambert equal area conic projection (one standard parallel is at a pole).
OPTIONS−c lat1 lat2 use the Lambert conformal conic projection with standard parallels ​lat1 and lat2. −a lat1 lat2 use the Albers equal area projection with standard parallels lat1 and ​lat2. −l lon0 specify the longitude of origin lon0 (degrees, default 0). −k k1 specify the (azimuthal) scale k1 on the standard parallels (default 1). −r perform the reverse projection. x and y are given on standard input and each line of standard output gives latitude, longitude, ​gamma, and k. −e a f specify the ellipsoid via the equatorial radius, a and the flattening, f. Setting f = 0 results in a sphere. Specify ​f < 0 for a prolate ellipsoid. A simple fraction, e.g., 1/297, is allowed for f. By default, the WGS84 ellipsoid is used, a = 6378137 m, f = 1/298.257223563. −w toggle the longitude first flag (it starts off); if the flag is on, then on input and output, longitude precedes latitude (except that, on input, this can be overridden by a hemisphere designator, N, S, E, ​W). −p prec set the output precision to prec (default 6). prec is the number of digits after the decimal point for lengths (in meters). For latitudes and longitudes (in degrees), the number of digits after the decimal point is prec + 5. For the convergence (in degrees) and scale, the number of digits after the decimal point is prec + 6. −−comment−delimiter commentdelim set the comment delimiter to commentdelim (e.g., ‟#” or ‟//”). If set, the input lines will be scanned for this delimiter and, if found, the delimiter and the rest of the line will be removed prior to processing and subsequently appended to the output line (separated by a space). −−version print version and exit. −h print usage and exit. −−help print full documentation and exit. −−input−file infile read input from the file infile instead of from standard input; a file name of ‟−” stands for standard input. −−input−string instring read input from the string instring instead of from standard input. All occurrences of the line separator character (default is a semicolon) in instring are converted to newlines before the reading begins. −−line−separator linesep set the line separator character to linesep. By default this is a semicolon. −−output−file outfile write output to the file outfile instead of to standard output; a file name of ‟−” stands for standard output.
EXAMPLES​ echo 39.95N 75.17W | ConicProj −c 40d58 39d56 −l 77d45W ​ => 220445 −52372 1.67 1.0 ​ echo 220445 −52372 | ConicProj −c 40d58 39d56 −l 77d45W −r ​ => 39.95 −75.17 1.67 1.0
ERRORSAn illegal line of input will print an error message to standard output beginning with ERROR: and causes ConicProj to return an exit code of 1. However, an error does not cause ConicProj to terminate; following lines will be converted.
AUTHOR​ConicProj was written by Charles Karney.
HISTORY​ConicProj was added to GeographicLib, <https://geographiclib.sourceforge.io>, in version 1.9. 0
Johanes Gumabo
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