1CONICPROJ(1) GeographicLib Utilities CONICPROJ(1)
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6 ConicProj -- perform conic projections
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9 ConicProj ( -c | -a ) lat1 lat2 [ -l lon0 ] [ -k k1 ] [ -r ] [ -e a f ]
10 [ -w ] [ -p prec ] [ --comment-delimiter commentdelim ] [ --version |
11 -h | --help ] [ --input-file infile | --input-string instring ] [
12 --line-separator linesep ] [ --output-file outfile ]
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15 Perform one of two conic projections geodesics. Convert geodetic
16 coordinates to either Lambert conformal conic or Albers equal area
17 coordinates. The standard latitudes lat1 and lat2 are specified by
18 that the -c option (for Lambert conformal conic) or the -a option (for
19 Albers equal area). At least one of these options must be given (the
20 last one given is used). Specify lat1 = lat2, to obtain the case with
21 a single standard parallel. The central meridian is given by lon0.
22 The longitude of origin is given by the latitude of minimum (azimuthal)
23 scale for Lambert conformal conic (Albers equal area). The (azimuthal)
24 scale on the standard parallels is k1.
25 Geodetic coordinates are provided on standard input as a set of lines
27 containing (blank separated) latitude and longitude (decimal degrees or
28 degrees, minutes, seconds); for details on the allowed formats for
29 latitude and longitude, see the "GEOGRAPHIC COORDINATES" section of
30 GeoConvert(1). For each set of geodetic coordinates, the corresponding
31 projected easting, x, and northing, y, (meters) are printed on standard
32 output together with the meridian convergence gamma (degrees) and
33 (azimuthal) scale k. For Albers equal area, the radial scale is 1/k.
34 The meridian convergence is the bearing of the y axis measured
35 clockwise from true north.
36 Special cases of the Lambert conformal projection are the Mercator
38 projection (the standard latitudes equal and opposite) and the polar
39 stereographic projection (both standard latitudes correspond to the
40 same pole). Special cases of the Albers equal area projection are the
41 cylindrical equal area projection (the standard latitudes equal and
42 opposite), the Lambert azimuthal equal area projection (both standard
43 latitude corresponds to the same pole), and the Lambert equal area
44 conic projection (one standard parallel is at a pole).
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47 -c lat1 lat2
48 use the Lambert conformal conic projection with standard parallels
49 lat1 and lat2.
50 -a lat1 lat2
52 use the Albers equal area projection with standard parallels lat1
53 and lat2.
54 -l lon0
56 specify the longitude of origin lon0 (degrees, default 0).
57 -k k1
59 specify the (azimuthal) scale k1 on the standard parallels (default
60 1).
61 -r perform the reverse projection. x and y are given on standard
63 input and each line of standard output gives latitude, longitude,
64 gamma, and k.
65 -e a f
67 specify the ellipsoid via the equatorial radius, a and the
68 flattening, f. Setting f = 0 results in a sphere. Specify f < 0
69 for a prolate ellipsoid. A simple fraction, e.g., 1/297, is
70 allowed for f. By default, the WGS84 ellipsoid is used, a =
71 6378137 m, f = 1/298.257223563.
72 -w toggle the longitude first flag (it starts off); if the flag is on,
74 then on input and output, longitude precedes latitude (except that,
75 on input, this can be overridden by a hemisphere designator, N, S,
76 E, W).
77 -p prec
79 set the output precision to prec (default 6). prec is the number
80 of digits after the decimal point for lengths (in meters). For
81 latitudes and longitudes (in degrees), the number of digits after
82 the decimal point is prec + 5. For the convergence (in degrees)
83 and scale, the number of digits after the decimal point is prec +
84 6.
85 --comment-delimiter commentdelim
87 set the comment delimiter to commentdelim (e.g., "#" or "//"). If
88 set, the input lines will be scanned for this delimiter and, if
89 found, the delimiter and the rest of the line will be removed prior
90 to processing and subsequently appended to the output line
91 (separated by a space).
92 --version
94 print version and exit.
95 -h print usage and exit.
97 --help
99 print full documentation and exit.
100 --input-file infile
102 read input from the file infile instead of from standard input; a
103 file name of "-" stands for standard input.
104 --input-string instring
106 read input from the string instring instead of from standard input.
107 All occurrences of the line separator character (default is a
108 semicolon) in instring are converted to newlines before the reading
109 begins.
110 --line-separator linesep
112 set the line separator character to linesep. By default this is a
113 semicolon.
114 --output-file outfile
116 write output to the file outfile instead of to standard output; a
117 file name of "-" stands for standard output.
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120 echo 39.95N 75.17W | ConicProj -c 40d58 39d56 -l 77d45W
121 => 220445 -52372 1.67 1.0
122 echo 220445 -52372 | ConicProj -c 40d58 39d56 -l 77d45W -r
123 => 39.95 -75.17 1.67 1.0
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126 An illegal line of input will print an error message to standard output
127 beginning with "ERROR:" and causes ConicProj to return an exit code of
128 1. However, an error does not cause ConicProj to terminate; following
129 lines will be converted.
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132 ConicProj was written by Charles Karney.
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135 ConicProj was added to GeographicLib,
136 <https://geographiclib.sourceforge.io>, in version 1.9.
137GeographicLib 1.52 2022-02-24 CONICPROJ(1)