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-.\" release 5
-.\"
-.ad b
-.hy 1
-.TH NAD2NAD 1 "2018/02/15 Rel. 5.0.0"
-.SH NAME
-nad2nad \- North American Datum conversion filter
-.SH SYNOPSIS
-.B nad2nad
-[
-.B \-eEfihortwW
-[
-.I args
-] ] [
-.B +args
-]
-file[s]
-.SH DESCRIPTION
-Program
-.B nad2nad
-is a filter to convert data between North
-America Datum 1927 (NAD27) and North American Datum 1983.
-.B nad2nad
-can optionally process both State Plane Coordinate System (SPCS) and
-Universal Transverse Mercator (UTM) grid data as well
-as geographic data for both input and output.  This can also be 
-accomplished with the \fIcs2cs\fR program.
-.PP
-The following control parameters can appear in any order:
-.TP
-.BI \-[i|o] " keyword[,keyword]"
-The
-.B \-i
-and
-.B \-o
-option expect keyword arguments which define various characteristics and
-processing modes of the
-respective input data.
-Usage allows multiple arguments to be included with a \- operator
-when separated by commas.
-Datum conversion requires the data to be in geographic coordinates, but
-.B nad2nad
-will allow conversion of data to and from SPCS or UTM grid systems.
-The following are keywords and arguments recognized by both the
-.B \-i
-and
-.B \-o
-that will apply to respective input and output conversion of user
-data to internal geographic coordinates:
-.RS 1in
-.TP
-.B 27|83
-datum of data
-.TP
-.BI utm= n
-.B UTM
-coordinates in meters for zone
-.I n
-.TP
-.BI spcs= n
-for data in
-.B SPCS
-coordinates, where
-.I n
-is state zone number.
-.TP
-.B feet
-data units are in U.S. Surveyor's feet.
-This is allowed only when the
-.I spcs
-option been previously used.
-Default coordinates are in meters.
-.TP
-.B bin
-for data in binary form.
-.TP
-.B rev
-data in lat-lon order rather than default lon-lat order.
-.TP
-.BI hp= ss
-use high precision conversion zone
-.I ss.
-Certain States have ancillary correction tables to further refine
-the basic conus table.
-.I Ss
-key and States are:
-.RS .5in
-FL Florida
-.br
-MD Maryland
-.br
-TN Tennessee
-.br
-WI Wisconsin
-.br
-WO Washington, Oregon and northern part of California.
-.RE
-.RE
-.TP
-.BI \-t "a"
-.I 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).
-.TP
-.BI \-e " string"
-.I String
-is an arbitrary string to be output if an error is detected during
-data transformations.
-The default value is: *\et*.
-Note that if the
-.B "\-o bin"
-option is employed, an error is output as HUGE_VAL for both values.
-.TP
-.BI \-r " region"
-specifies which regional conversion table to employ which are identified
-by the following:
-.RS .5in
-conus \- conterminous 48 States
-.br
-alaska \- State of Alaska
-.br
-hawaii \- State of Hawaii
-.br
-prvi \- Puerto Rico and Virgin Islands
-.br
-stgeorge \- St. George Is, Alaska
-.br
-stpaul \- St. Paul Is, Alaska
-.br
-stlrnc \- St. Lawrence Is, Alaska
-.TP
-.B \-E
-Input coordinates are echoed to output before output values.
-.RE
-.TP
-.BI \-f " format"
-.I Format
-is a
-.I 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.
-.TP
-.BI \-[w|W] n
-.I N
-is the number of significant fractional digits to employ for
-seconds output (when the option is not specified,
-.B \-w3
-is assumed).
-When
-.B \-W
-is employed the fields will be constant width and with leading zeroes.
-.PP
-One or more
-.I 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
-.I stdin.
-For ASCII 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.
-.PP
-Input geographic data
-(longitude and latitude) must be in DMS format when neither
-.I utm
-nor
-.I spcs
-is specified, otherwise in meters or feet (\fIfeet\fR option used).
-Input data fields must be separated by white space and not have
-imbedded white space.
-.PP
-Output data will be in tab separated fields of DMS or grid
-coordinates in meters or feet.
-.PP
-Any data after the two input values are echoed after the two
-output data values.
-.SH SEE ALSO
-.B cs2cs(1U), proj(1U),
-.br
-.I "Cartographic Projection Procedures for the UNIX Environment\(emA User's Manual,"
-(Evenden, 1990, Open-file report 90\-284).
-.SH BUGS
-A list of known bugs can found at https://github.com/OSGeo/proj.4/issues
-where new bug reports can be submitted too.
-.SH HOME PAGE
-https://proj4.org/