1SHPADD(1)                          shapelib                          SHPADD(1)
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NAME

6       shpadd - append a shape to an ESRI shapefile
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SYNOPSIS

9       shpadd shp_file [[x y] [+]]*
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DESCRIPTION

12       Appends  a shape to the shapefile determined from shp_file. The geomet‐
13       ric data of the new shape consists of lists of X/Y points on  the  com‐
14       mand  line grouped into parts, with points in different parts separated
15       by a plus (+) sign. If no points or parts are given  then  a  shape  of
16       type  NullShape is appended to the shapefile, and otherwise the type of
17       the new shape is determined by the shapefile´s header.  See  shpdump(1)
18       for  a  description of shape types and how geometric data for parts are
19       interpreted for a specific type. No geometric restrictions set  by  the
20       shapefile specification are enforced by shpadd(1).
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22       Shapefiles actually consist of two files with the same basename and ex‐
23       tensions .shp and .shx (or .SHP and .SHX) containing the shape data and
24       shape  index  respectively.  The  files to open are determined by first
25       stripping any filename extension from file and attempting to  open  the
26       files  shp_file.shp  or  shp_file.SHP, and shp_file.shx or shp_file.SHX
27       for the respective data and index files.
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OPTIONS

30       shp_file
31              the name of an existing shapefile.
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33       x1 y1 x2 y2 ... xn yn
34              the set of x,y coordinates that describes  the  shape  that  you
35              wish  to  add.  Note that you must specify the correct number of
36              parameters for a given type of shapefile. e.g.: for point shape‐
37              files  you have to pass 1 pair of XY coordinates and for a poly‐
38              gon shapefile you should pass at least 4 pairs of XY coordinates
39              (where  the  first and the last point must have the same coordi‐
40              nates).
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EXAMPLE

43       shpadd testpolygon 100000 7000000 250000 6500000 200000 6000000  100000
44       7000000
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46       assuming  that  testpolygon  is  a polygon shapefile, this command line
47       will insert a new shape (a triangle) into testpolygon with the  follow‐
48       ing XY coordinates:
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51           vertice 0: 100000 7000000 (this will also be the vertice where the shape starts and ends)
52           vertice 1: 250000 6500000
53           vertice 2: 200000 6000000
54           vertice 3: 100000 7000000
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EXIT STATUS

59       0      Successful program execution.
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61       1      Missing shp_file argument, the shapefile can´t be opened, or the
62              program ran out of memory.
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DIAGNOSTICS

65       The following diagnostics may be issued on stdout:
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67       Unable to open:shp_file
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69       Out of memory
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AUTHOR

72       shpadd is part of shapelib, maintained by Frank Warmerdam.  This  guide
73       was  created by Eduardo Patoo Kanegae and converted to manpage by Johan
74       Van de Wauw.
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BUGS

77       Coordinate values that can´t be be parsed by  sscanf(3)  get  undefined
78       values.  There´s  no  way  to  give  measure or Z data to vertices in a
79       shape, but those are always set to zero if the shapefile´s  shape  type
80       requires those values. MultiPatch shape types aren´t supported.
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SEE ALSO

83       dbfadd(1),  dbfcat(1), dbfcreate(1), dbfdump(1), dbfinfo(1), shpcat(1),
84       shpcentrd(1),  shpcreate(1),  shpdump(1),  shpdxf(1),  shpfix(1),   sh‐
85       pinfo(1), shpproj(1), shprewind(1), shptest(1)
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89                                 January 2021                        SHPADD(1)
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