From 63548adb61b985d9f0aebfb83cf04bc2fdf83df8 Mon Sep 17 00:00:00 2001 From: Paulo van Breugel Date: Sat, 10 Feb 2024 16:25:45 +0100 Subject: [PATCH 1/4] v.multi2singlepart new addon Addon to split multipart polygons to singlepart polygons. p.s. I created this because I couldn't find an obvious way to do this. I feel there should be, so let me know if I missed it. --- src/vector/v.multi2singlepart/Makefile | 7 ++ .../v.multi2singlepart.html | 38 ++++++ .../v.multi2singlepart/v.multi2singlepart.py | 110 ++++++++++++++++++ 3 files changed, 155 insertions(+) create mode 100644 src/vector/v.multi2singlepart/Makefile create mode 100644 src/vector/v.multi2singlepart/v.multi2singlepart.html create mode 100755 src/vector/v.multi2singlepart/v.multi2singlepart.py diff --git a/src/vector/v.multi2singlepart/Makefile b/src/vector/v.multi2singlepart/Makefile new file mode 100644 index 0000000000..ccae942c11 --- /dev/null +++ b/src/vector/v.multi2singlepart/Makefile @@ -0,0 +1,7 @@ +MODULE_TOPDIR = ../.. + +PGM = v.multi2singlepart + +include $(MODULE_TOPDIR)/include/Make/Script.make + +default: script diff --git a/src/vector/v.multi2singlepart/v.multi2singlepart.html b/src/vector/v.multi2singlepart/v.multi2singlepart.html new file mode 100644 index 0000000000..10cf73f064 --- /dev/null +++ b/src/vector/v.multi2singlepart/v.multi2singlepart.html @@ -0,0 +1,38 @@ +

DESCRIPTION

+ +v.multi2singlepart creates a vector layer containing +singlepart polygons generated by separating the multipart polygons of +the input vector layer. The attributes of the input layer will be +maintained in the output vector layer. Singlepart polygons will not be +affected. + +

NOTES

+ +To go from singlepart to multipart features, use the +v.dissolve function (see example below). + + +

EXAMPLES

+ +The example uses the layer boundary_municp from the North +Carolina dataset. You can download the sample data set from the grass gis website + +
+
+v.dissolve input=boundary_municp column=MB_NAME output=bnd_municp_dis
+v.multi2singlepart input=bnd_municp_dis output=bnd_municp_split
+
+
+ +

SEE ALSO

+ + v.dissolve + + + + +

AUTHOR

+ +Paulo van Breugel, paulo at ecodiv.earth diff --git a/src/vector/v.multi2singlepart/v.multi2singlepart.py b/src/vector/v.multi2singlepart/v.multi2singlepart.py new file mode 100755 index 0000000000..4e0594b8b4 --- /dev/null +++ b/src/vector/v.multi2singlepart/v.multi2singlepart.py @@ -0,0 +1,110 @@ +#!/usr/bin/env python + +# +############################################################################ +# +# MODULE: v.multi2singlepart +# AUTHOR(S): Paulo van Breugel +# PURPOSE: Split multipart polygons into singlepart polygon features +# +# COPYRIGHT: (C) 2024 Paulo van Breugel and the GRASS Development Team +# http://ecodiv.earth +# +# This program is free software under the GNU General Public +# License (>=v2). Read the file COPYING that comes with GRASS +# for details. +# +############################################################################# +# +# REQUIREMENTS: +# - +# %module +# % description: Split multi-polygon features into single polygon features. +# % keyword: vector +# % keyword: geometry +# %end + +# %option G_OPT_V_INPUT +# % description: Input vector layer +# % required : yes +# %end + +# %option G_OPT_V_OUTPUT +# % description: Output vector layer +# % required : yes +# %end + +# ---------------------------------------------------------------------------- +# Standard +# ---------------------------------------------------------------------------- + +# import libraries +import sys +import atexit +import sys +import uuid +import grass.script as gs + + +CLEAN_LAY = [] + + +def create_temporary_name(prefix): + tmpf = f"{prefix}{str(uuid.uuid4().hex)}" + CLEAN_LAY.append(tmpf) + return tmpf + + +def cleanup(): + """Remove temporary maps specified in the global list""" + maps = reversed(CLEAN_LAY) + mapset = gs.gisenv()["MAPSET"] + for map_name in maps: + for element in ("raster", "vector"): + found = gs.find_file( + name=map_name, + element=element, + mapset=mapset, + ) + if found["file"]: + gs.run_command( + "g.remove", + flags="f", + type=element, + name=map_name, + quiet=True, + ) + + +def main(options, flags): + + # Copy layer and remove all but cat column in new layer + tmplayer = create_temporary_name("tmp") + gs.run_command("g.copy", vector=[options["input"], tmplayer], overwrite=True) + cols = gs.read_command("db.columns", table=tmplayer).split("\n") + cols = [x for x in cols[1:] if x != ""] + gs.run_command("v.db.dropcolumn", map=tmplayer, columns=cols) + + # Overlay the original and copied layer + gs.run_command( + "v.overlay", + ainput=options["input"], + binput=tmplayer, + operator="and", + output=options["output"], + ) + + # Drop old cat columns + gs.run_command("v.db.dropcolumn", map=options["output"], columns=["a_cat", "b_cat"]) + + # Change the column names to the original names + for colname in cols: + oldcol = f"a_{colname}" + gs.run_command( + "v.db.renamecolumn", map=options["output"], column=[oldcol, colname] + ) + + +if __name__ == "__main__": + atexit.register(cleanup) + sys.exit(main(*gs.parser())) From 1959ba3dad2a3cc322fff57063d81e3733ef26b4 Mon Sep 17 00:00:00 2001 From: Paulo van Breugel Date: Sat, 10 Feb 2024 22:17:35 +0100 Subject: [PATCH 2/4] v.multi2singlepart: illustration added to manual page --- src/vector/v.multi2singlepart/example.png | Bin 0 -> 23045 bytes src/vector/v.multi2singlepart/example.svg | 198 ++++++++++++++++++ .../v.multi2singlepart.html | 6 + 3 files changed, 204 insertions(+) create mode 100644 src/vector/v.multi2singlepart/example.png create mode 100644 src/vector/v.multi2singlepart/example.svg diff --git a/src/vector/v.multi2singlepart/example.png b/src/vector/v.multi2singlepart/example.png new file mode 100644 index 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zP;mqR#RUAhB{GjsBZ(nQmypFn+%LiO+!SWjfne0zHkD-uBq9$-`AEx#(#tn?_U1pe zBtWy@X$aFba6A7HhKG_vRjCPtWiz}B|!Tgr=*MeVBPgYpnZ*X27G zPjGc-AZ05-mpYLMp6+OX!S+(r&_U?6fhc)IOe5&KE-+}Oc!O$QYP> zkPT;P0^yxm;m8|JSaa0Fq!ZfPEAqfz4rT%5t>}b={bFQ<9D2N{T?!rHx}DLrZ^^~B zV&cZ$C@q}6XU%OR{P68U!r#w$;wIM+;;tHN5fq+7Z&+G1T~MN%Y*#;$G{S^0EiX^~ zqTv0yE}SXeL|E!5>}6rT78A92&}?eA6ukr^2rcBwJiGJQf`YBTg_B@s0{zb}fx@R0 z6f%X$P}%aq!%A>bvHjEk;M5??iid+u=Wl(MGxMjn-v2Cs`RfE>|E-8WRs64(zI*2l YKQ!kY;5+BRx{QFCu@#bJ + + + + + + + + + + + + + + + 1 + 2 + 3 + + + + 1 + 1 + 1 + 1 multipart feature + 3 singlepart features + + + + + diff --git a/src/vector/v.multi2singlepart/v.multi2singlepart.html b/src/vector/v.multi2singlepart/v.multi2singlepart.html index 10cf73f064..ba2e4ce2d6 100644 --- a/src/vector/v.multi2singlepart/v.multi2singlepart.html +++ b/src/vector/v.multi2singlepart/v.multi2singlepart.html @@ -6,6 +6,12 @@

DESCRIPTION

maintained in the output vector layer. Singlepart polygons will not be affected. +

+

+From multipart to singlepart features
From multipart to singlepart features.
+ +

NOTES

To go from singlepart to multipart features, use the From 18aadba32cc54c09df4995007bd1342c95a9ff04 Mon Sep 17 00:00:00 2001 From: Paulo van Breugel Date: Sat, 17 Feb 2024 15:43:50 +0100 Subject: [PATCH 3/4] Apply suggestions from code review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Co-authored-by: Edouard Choinière <27212526+echoix@users.noreply.github.com> --- src/vector/v.multi2singlepart/v.multi2singlepart.html | 2 +- src/vector/v.multi2singlepart/v.multi2singlepart.py | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/src/vector/v.multi2singlepart/v.multi2singlepart.html b/src/vector/v.multi2singlepart/v.multi2singlepart.html index ba2e4ce2d6..7f855492a2 100644 --- a/src/vector/v.multi2singlepart/v.multi2singlepart.html +++ b/src/vector/v.multi2singlepart/v.multi2singlepart.html @@ -22,7 +22,7 @@

EXAMPLES

The example uses the layer boundary_municp from the North Carolina dataset. You can download the sample data set from the grass gis website +href="https://grass.osgeo.org/download/data/">GRASS GIS website 
diff --git a/src/vector/v.multi2singlepart/v.multi2singlepart.py b/src/vector/v.multi2singlepart/v.multi2singlepart.py
index 4e0594b8b4..90105f2488 100755
--- a/src/vector/v.multi2singlepart/v.multi2singlepart.py
+++ b/src/vector/v.multi2singlepart/v.multi2singlepart.py
@@ -26,12 +26,12 @@
 
 # %option G_OPT_V_INPUT
 # % description: Input vector layer
-# % required : yes
+# % required: yes
 # %end
 
 # %option G_OPT_V_OUTPUT
 # % description: Output vector layer
-# % required : yes
+# % required: yes
 # %end
 
 # ----------------------------------------------------------------------------

From af7ee94fdb73f5b77694af179cd82440a7f8b3af Mon Sep 17 00:00:00 2001
From: Paulo van Breugel 
Date: Thu, 29 Feb 2024 23:16:22 +0100
Subject: [PATCH 4/4] add topological check

clarify in help file that the function works for polygons only
---
 src/vector/v.multi2singlepart/v.multi2singlepart.html | 10 +++++-----
 src/vector/v.multi2singlepart/v.multi2singlepart.py   | 11 +++++++++--
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/vector/v.multi2singlepart/v.multi2singlepart.html b/src/vector/v.multi2singlepart/v.multi2singlepart.html
index 7f855492a2..5a5012faac 100644
--- a/src/vector/v.multi2singlepart/v.multi2singlepart.html
+++ b/src/vector/v.multi2singlepart/v.multi2singlepart.html
@@ -1,15 +1,15 @@
 
DESCRIPTION

 
 v.multi2singlepart creates a vector layer containing 
-singlepart polygons generated by separating the multipart polygons of 
-the input vector layer. The attributes of the input layer will be 
-maintained in the output vector layer. Singlepart polygons will not be 
-affected.
+singlepart polygon features generated by separating the multipart 
+features of the input vector layer. The attributes of the input layer 
+will be maintained in the output vector layer. Singlepart features will 
+not be affected.
 
 

 
  
 From multipart to singlepart features 
 From multipart to singlepart features. 

+border="0" width=400 height="auto"> 
 From multipart to singlepart polygons.

NOTES

diff --git a/src/vector/v.multi2singlepart/v.multi2singlepart.py b/src/vector/v.multi2singlepart/v.multi2singlepart.py index 90105f2488..e8f1f33a9e 100755 --- a/src/vector/v.multi2singlepart/v.multi2singlepart.py +++ b/src/vector/v.multi2singlepart/v.multi2singlepart.py @@ -5,7 +5,7 @@ # # MODULE: v.multi2singlepart # AUTHOR(S): Paulo van Breugel -# PURPOSE: Split multipart polygons into singlepart polygon features +# PURPOSE: Split multipart polygon features into singlepart features # # COPYRIGHT: (C) 2024 Paulo van Breugel and the GRASS Development Team # http://ecodiv.earth @@ -19,7 +19,7 @@ # REQUIREMENTS: # - # %module -# % description: Split multi-polygon features into single polygon features. +# % description: Split multi-part polygons into single-part polygons. # % keyword: vector # % keyword: geometry # %end @@ -85,12 +85,19 @@ def main(options, flags): cols = [x for x in cols[1:] if x != ""] gs.run_command("v.db.dropcolumn", map=tmplayer, columns=cols) + # Check topology + top = gs.parse_command("v.info", flags="t", map=tmplayer) + if int(top["areas"]) == 0: + gs.fatal(_("The layer does not contain areas. Exiting...")) + # Overlay the original and copied layer gs.run_command( "v.overlay", ainput=options["input"], binput=tmplayer, operator="and", + atype="area", + btype="area", output=options["output"], )