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NAME

       r.coin   -  Tabulates the mutual occurrence (coincidence) of categories for two raster map
       layers.

KEYWORDS

       raster, statistics

SYNOPSIS

       r.coin
       r.coin --help
       r.coin [-w] first=name second=name units=string  [--help]  [--verbose]  [--quiet]  [--ui]

   Flags:
       -w
           Wide report, 132 columns (default: 80)

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       first=name [required]
           Name of first input raster map

       second=name [required]
           Name of second input raster map

       units=string [required]
           Unit of measure
           c(ells), p(ercent), x(percent of category [column]),  y(percent  of  category  [row]),
           a(cres), h(ectares), k(square kilometers), m(square miles)
           Options: c, p, x, y, a, h, k, m

DESCRIPTION

       r.coin  tabulates  the mutual occurrence of two raster map layers’ categories with respect
       to one another.  This analysis program respects the current  geographic  region  and  mask
       settings.

       r.coin  tabulates the coincidence of category values among the two map layers and prepares
       the basic table from which the report is to be created.  This tabulation is followed by an
       indication of how long the coincidence table will be.  If the table is extremely long, the
       user may decide that viewing it is not so important after all, and may cancel the  request
       at  this point.  Assuming the user continues, r.coin then allows the user to choose one of
       eight units of measure in which the report results can be given.  These units are:

       c
           cells

       p
           percent cover of region

       x
           percent of <map name> category (column)

       y
           percent of <map name> category (row)

       a
           acres

       h
           hectares

       k
           square kilometers

       m
           square miles

       Note that three of these options give results as percentage values:  "p" is based  on  the
       grand  total number of cells; "x" is based on only column totals; and "y" is based on only
       row totals.  Only one unit of measure can be selected per report output.  Type in just one
       of  the  letters designating a unit of measure followed by a <RETURN>.  The report will be
       printed to the screen for review.  After reviewing the report on the screen, the  user  is
       given  several  options.   The report may be saved to a file and/or sent to a printer.  If
       printed, it may be printed with either 80 or 132 columns.  Finally, the user is given  the
       option to rerun the coincidence tabulation using a different unit of measurement.

NOTES

       It  is  not  a  good  idea  to  run  r.coin on a map layer which has a monstrous number of
       categories (e.g., unreclassed elevation).  Because r.coin reports information for each and
       every  category, it is better to reclassify those categories (using r.reclass) into a more
       manageable number prior to running r.coin on the reclassed raster map layer.

EXAMPLE

       Below is a sample of tabular output produced by r.coin.  Here, map  output  is  stated  in
       units  of  square  miles.   The  report  tabulates the coincidence of the Spearfish sample
       database’s owner and road raster map layers’ categories.  The  owner  categories  in  this
       case  refer  to  whether the land is in private hands (category 1) or is owned by the U.S.
       Forest Service (category 2). The roads map layer categories  refer  to  various  types  of
       roads  (with  the  exception  of  category value "0", which indicates "no data"; i.e., map
       locations at which no roads exist).  r.coin does not  report  category  labels.  The  user
       should run r.report or r.category to obtain this information.

       The  body  of  the report is arranged in panels. The map layer with the most categories is
       arranged along the vertical axis of the table; the other, along the horizontal axis.  Each
       panel  has  a maximum of 5 categories (9 if printed) across the top. In addition, the last
       two columns reflect a cross total of each column for each row.  All of the  categories  of
       the  map  layer  arranged  along the vertical axis are included in each panel.  There is a
       total at the bottom of each column representing the sum of all the rows in that column.  A
       second  total  represents  the sum of all the non-zero category rows. A cross total (Table
       Row Total) of all columns for each row appears in a separate panel.

       Note how the following information may be obtained from the sample report.

       In the Spearfish data base, in area not owned by  the  Forest  Service,  there  are  50.63
       square  miles  of land not used for roads. Roads make up 9.27 square miles of land in this
       area.

       Of the total 102.70 square miles in Spearfish, 42.80 square miles is owned by  the  Forest
       Service.
       In total, there are 14.58 square miles of roads.

       There are more category 2 roads outside Forest Service land (2.92 mi. sq.)  than there are
       inside Forest land boundaries (0.72 mi. sq.).

       Following is a sample report.
       +------------------------------------------------------------+
       |                    COINCIDENCE TABULATION REPORT           |
       |------------------------------------------------------------|
       |Location: spearfish    Mapset: PERMANENT   Date: Wed Jun 1  |
       |                                                            |
       | Layer 1: owner          -- Ownership                       |
       | Layer 2: roads          -- Roads                           |
       | Mask:    none                                              |
       |                                                            |
       | Units:   square miles                                      |
       |------------------------------------------------------------|
       | Window:                North: 4928000.00                   |
       |          West: 590000.00               East: 609000.00     |
       |                        South: 4914000.00                   |
       +------------------------------------------------------------+
       Panel #1 of 1
       +--------------------------------------------------------+
       |        | owner                 |    Panel Row Total    |
       |   cat# |         1 |         2 |   w cat 0 | w/o cat 0 |
       |--------------------------------------------------------|
       |r     0 |     50.63 |     37.49 |     88.12 |     88.12 |
       |o     1 |      1.53 |      0.68 |      2.21 |      2.21 |
       |a     2 |      2.92 |      0.72 |      3.64 |      3.64 |
       |d     3 |      3.97 |      2.57 |      6.54 |      6.54 |
       |s     4 |      0.65 |      1.36 |      2.00 |      2.00 |
       |      5 |      0.19 |      0.00 |      0.19 |      0.19 |
       |--------------------------------------------------------|
       |Total   |           |           |           |           |
       |with 0  |     59.90 |     42.80 |    102.70 |    102.70 |
       |--------------------------------------------------------|
       |w/o 0   |      9.27 |      5.32 |     14.58 |     14.58 |
       +--------------------------------------------------------+
       +--------------------------------+
       |        |    Table Row Total    |
       |   cat# |   w cat 0 | w/o cat 0 |
       |--------------------------------|
       |r     0 |     88.12 |     88.12 |
       |o     1 |      2.21 |      2.21 |
       |a     2 |      3.64 |      3.64 |
       |d     3 |      6.54 |      6.54 |
       |s     4 |      2.00 |      2.00 |
       |      5 |      0.19 |      0.19 |
       |--------------------------------|
       |Total   |           |           |
       |with 0  |    102.70 |    102.70 |
       |--------------------------------|
       |w/o 0   |     14.58 |     14.58 |
       +--------------------------------+

       r.coin calculates the coincidence of two raster map layers.  Although  r.coin  allows  the
       user  to  rerun  the  report using different units, it is not possible to simply rerun the
       report with different map layers.  In order to choose new map layers, it is  necessary  to
       rerun r.coin.

SEE ALSO

        g.region, r.category, r.describe, r.reclass, r.report, r.stats

AUTHORS

       Michael O’Shea,
       Michael Shapiro,
       U.S. Army Construction Engineering Research Laboratory

       Last changed: $Date: 2014-12-28 16:45:01 +0100 (Sun, 28 Dec 2014) $

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