CART2PLS

 

converts cartesian coordinate points (e.g. lat/long or UTM) into Public Land Survey (PLS) descriptions.  For example, the input lat/long might be: -122.47041 43.12281 and the output description: "T0280S R0030E S021","SENW".

____________________________________________________________________________

 

cart2pls {DMS | DEC} {level} {in_gen_file} {out_pls_file} {pls_gen_file} {pls_att_file}

 

ARGUMENTS

 

{DMS | DEC} - the format of the input coordinates in the {in_gen_file}.

 

DMS - the coordinates are in degrees, minutes, and seconds in the format DDD.MMSSSS.  In other words, if the coordinate is latitude -122 degrees, 28 minutes, 13.4916, then enter it in the format: -122.28134916.  DMS is the default

 

DEC - the coordinates are decimal values, e.g. decimal degrees for lat/long coordinates and meters for UTM coordinates.  For example, if the coordinate is latitude -122 degrees, 28 minutes, 13.4916 seconds, then enter -122.47041433 (i.e. -1 * (122 + 28/60 + 13.4916/3600)).

 

{level} - the resolution to report the legal descriptions.

 

The valid range is 0-9.  0 specifies section level (e.g. "T0280S R0030E S021",""), 1 specifies quarter-section level (e.g. "T0280S R0030E S021","NW"), 2 specifies quarter-quarter-section level (e.g.  "T0280S R0030E S021","SENW"), etc.  The default is 2.

 

{in_gen_file} - the file containing the cartesian coordinates to be converted to legal descriptions.

 

If no file is specified, the user is prompted to enter the coordinates.

 

The file should be in ARC GENERATE point format.  In other words, each record should contain 3 space delimited values: ID number, X coordinate, Y coordinate.  For example:

 

8 -122.28134916213 43.07221242960

 

And the last record should contain an 'END'.

 

NOTE: Remember that longitude is the X coordinate and that it is negative in the Western hemisphere.

 

NOTE: The coordinate systems of the input points and the PLS section polygons (see {pls_gen_file}) must be the same.  For example, if the section polygons are in longitude and latitude, than so must the input points.  If UTM meters, than UTM meters, and so on.

 

{out_pls_file} - the name for the output file to contain the legal descriptions of the input points.

 

If no file is specified, the results are displayed to the screen.

 

The output file may not be the name of an existing file or directory.

 

Each record of output has 3 values: section attribute, subsection code, and ID number.  For example:

 

"T0280S R0030E S021","SENW", 8

 

This format is the same as the input format to the PLSARC AML.

 

For each input point which does not fall within a section polygon this is recorded to a reject file named the same as the {out_pls_file} with a '.rej' extension.  If no {out_pls_file} is specified, the rejects are also displayed to the screen.

 

NOTE: In the above example the section code is "SENW".  This means the southeast quarter of the northwest quarter of the section.  In other words, the input point was somewhere within the quarter-quarter section marker with an 'x' below:

 

-------------

|__|__|     |

|  |x |     |

|-----|-----|

|     |     |

|     |     |

-------------

 

{pls_gen_file} - the file containing the PLS section polygons.

 

The file should be in ARC GENERATE polygon format.  Create it using the ARC UNGENERATE command to export an ARC polygon coverage of the PLS sections.

 

CART2PLS will convert this file into a binary format in the following 6 files: section.hdr, section.fea, section.isl, section.crd, section.qtq, and section.qtf.  These files will be created in the directory from which CART2PLS is executed.

 

If {pls_gen_file} is not specified, then the 6 section.??? files must already exist.

 

Therefore, only specify {pls_gen_file} the first time CART2PLS is run.

 

NOTE: In the case of lat/long data, the coordinates should be formatted in decimal degrees.

 

{pls_att_file} - the file containing the PLS section attributes.

 

Each record of the file should contain the Township, Range, and Section description of each of the section polygons in the {pls_gen_file}.  It can be created using the UNLOAD command in ARC TABLES, and will look like:

 

''

'T0180N R0080E S006'

'T0180n R0080E S005'

'T0180n R0080E S008'

etc.

 

NOTE: The order of the attributes should match the ID number of the section polygons.  Therefore, do not delete the first record which belongs to the universe polygon or else the attributes will become out of sync.

 

CART2PLS incorporates the attributes into the section.fea file.

 

As with {pls_gen_file}, {pls_att_file} need only be specified the first time CART2PLS is run.

 

 

NOTES

 

- ARGUMENTS listed within angle brackets (<>) are required, and those within squiggly brackets ({}) are optional.  To accept the default value for any optional argument, enter a carrot (^), or enter nothing if no more arguments are to be supplied.

 

 

DISCUSSION

 

DESCRIPTIONS NOT ALWAYS LEGALLY CORRECT - The subsection code given to each input point (e.g. "SENW") is the subsection of the section polygon within which the point falls.  Which subsection this is is determined by means of proportional subdivision.  However, proportional subdivision is not always the 'legally' correct way of subdividing sections.  For instance, sections along the north and west sides of townships are usually not exactly 640 acres in size and 'legally' should not be proportionally subdivided.  The quarter-quarter sections along the north and west sides of the township are usually 'lots' and are usually not the same size as the other quarter-quarter sections, otherwise known as aliquot parts.

 

However, CART2PLS is designed not to follow 'legal' rules, but instead to mimic how most people have used the PLS system as a general locational tool, as apposed to a legal tool.

 

 

EXAMPLES

 

To see the usage:

 

% cart2pls

 

Usage: cart2pls {DMS | DEC} {level} {in_gen_file}

{out_pls_file} {pls_gen_file} {pls_att_file}

 

The initial run to create the section files:

 

% cart2pls dms 4 ^ ^ rr_sec.gen rr_sec.att

 

Enter: <id> <x> <y>  (type END to exit)

8 -122.28134916213 43.07221242960

"T0280S R0030E S021","NENESENW", 8

Enter: <id> <x> <y>  (type END to exit)

end

 

A subsequent run to convert a file of input points:

 

% cart2pls ^ ^ firell firepls