NAME
cs2cs - cartographic coordinate system filter
SYNOPSIS
cs2cs [ -eEfIlrstvwW [ args ] ] [ +opts[=arg] ]
[ +to [+opts[=arg]] ] file[s]
DESCRIPTION
Cs2cs performs transformation between the source and destination
cartographic coordinate system on a set of input points. The
coordinate system transformation can include translation between
projected and geographic coordinates as well as the application of
datum shifts.
The following control parameters can appear in any order:
-I method to specify inverse translation, convert from +to
coordinate system to the primary coordinate system defined.
-ta A specifies a character employed as the first character to
denote a control line to be passed through without processing.
This option applicable to ascii input only. (# is the default
value).
-e string
String is an arbitrary string to be output if an error is
detected during data transformations. The default value is:
*\t*. Note that if the -b, -i or -o options are employed, an
error is returned as HUGE_VAL value for both return values.
-E causes the input coordinates to be copied to the output line
prior to printing the converted values.
-l[p|P|=|e|u|d]id
List projection identifiers with -l, -lp or -lP (expanded) that
can be selected with +proj. -l=id gives expanded description of
projection id. List ellipsoid identifiers with -le, that can be
selected with +ellps, -lu list of cartesian to meter conversion
factors that can be selected with +units or -ld list of datums
that can be selected with +datum.
-r This options reverses the order of the expected input from
longitude-latitude or x-y to latitude-longitude or y-x.
-s This options reverses the order of the output from x-y or
longitude-latitude to y-x or latitude-longitude.
-f format
Format is a printf format string to control the form of the
output values. For inverse projections, the output will be in
degrees when this option is employed. If a format is specified
for inverse projection the output data will be in decimal
degrees. The default format is "%.2f" for forward projection
and DMS for inverse.
-[w|W]n
N is the number of significant fractional digits to employ for
seconds output (when the option is not specified, -w3 is
assumed). When -W is employed the fields will be constant width
and with leading zeroes.
-v causes a listing of cartographic control parameters tested for
and used by the program to be printed prior to input data.
The +args run-line arguments are associated with cartographic
parameters and usage varies with projection and for a complete
description see Cartographic Projection Procedures for the UNIX
EnvironmentA Users Manual ) and supplementary documentation for
Release 4.
The cs2cs program requires two coordinate system definitions. The
first (or primary is defined based on all projection parameters not
appearing after the +to argument. All projection parameters appearing
after the +to argument are considered the definition of the second
coordinate system. If there is no second coordinate system defined, a
geographic coordinate system based on the datum and ellipsoid of the
source coordinate system is assumed. Note that the source and
destination coordinate system can both be projections, both be
geographic, or one of each and may have the same or different datums.
Additional projection control parameters may be contained in two
auxiliary control files: the first is optionally referenced with the
+init=file:id and the second is always processed after the name of the
projection has been established from either the run-line or the
contents of +init file. The environment parameter PROJ_LIB establishes
the default directory for a file reference without an absolute path.
This is also used for supporting files like datum shift files.
One or more files (processed in left to right order) specify the source
of data to be transformed. A - will specify the location of processing
standard input. If no files are specified, the input is assumed to be
from stdin. For input data the two data values must be in the first
two white space separated fields and when both input and output are
ASCII all trailing portions of the input line are appended to the
output line.
Input geographic data (longitude and latitude) must be in DMS format
and input cartesian data must be in units consistent with the ellipsoid
major axis or sphere radius units. Output geographic coordinates will
be in DMS (if the -w switch is not employed) and precise to 0.001" with
trailing, zero-valued minute-second fields deleted.
EXAMPLE
The following script
cs2cs +proj=latlong +datum=NAD83
+to +proj=utm +zone=10 +datum=NAD27 -r <<EOF
45d15’33.1" 111.5W
45d15.551666667N -111d30
+45.25919444444 111d30’000w
EOF
will transform the input NAD83 geographic coordinates into NAD27
coordinates in the UTM projection with zone 10 selected. The
geographic values of this example are equivalent and meant as examples
of various forms of DMS input. The x-y output data will appear as
three lines of:
1402285.99 5076292.42 0.000
SEE ALSO
proj(1U),
Cartographic Projection Procedures for the UNIX EnvironmentA Users
Manual, (Evenden, 1990, Open-file report 90-284).
Map Projections Used by the U. S. Geological Survey (Snyder, 1984, USGS
Bulletin 1532).
Map ProjectionsA Working Manual (Snyder, 1988, USGS Prof. Paper 1395).
An Album of Map Projections (Snyder & Voxland, 1989, USGS Prof. Paper
1453).
HOME PAGE
http://www.remotesensing.org/proj
2000/03/21 Rel. 4.4 PROJ(1)