Working with GRASS without starting it explicitly - Revision history

Neteler: Attempt to cleanup the page (remove old GRASS 7 cruft)

2026-01-09T14:15:11Z

Attempt to cleanup the page (remove old GRASS 7 cruft)

Neteler: update to G8.4

2024-06-18T18:21:08Z

update to G8.4

← Older revision		Revision as of 18:21, 18 June 2024
Line 237:		Line 237:
	# Import GRASS Python bindings		# Import GRASS Python bindings
	import grass.script as gs		import grass.script as gs
	~~import grass.script.setup as gsetup~~

	# ~~Start GRASS Session~~		# full path to new project (formerly: location)
	~~session~~ = ~~gsetup~~.init(~~grassdata, location, mapset~~)		project = "/tmp/grassproject_epsg_25832"
			gs.create_project(project, epsg="25832")

			# initialize project
			gs.setup.init(project)
	</source>		</source>

Line 247:		Line 250:
	<source lang="python">		<source lang="python">
	# show current GRASS GIS settings		# show current GRASS GIS settings
	print(gs.~~read_command~~("g.gisenv"))		print("GRASS GIS session: tests for PROJ, GDAL, PDAL, GRASS GIS")
			print(gs.parse_command("g.gisenv", flags="s"))
	</source>		</source>

Neteler: + Python: GRASS GIS 8 with existing location

2022-07-22T07:30:00Z

+ Python: GRASS GIS 8 with existing location

@@ Line 212: / Line 212: @@
 C:\>grass78.bat --config path
 C:\OSGeo4W\apps\grass\grass-7.8
 </source>
@@ Line 217: / Line 284: @@
 See the example in the [https://grass.osgeo.org/grass78/manuals/libpython/script.html#module-script.setup documentation] or the script which initializes the session and lists available raster and vector maps:
 Note: For Python3 support you need to use at least GRASS GIS 7.8. Details are found at https://trac.osgeo.org/grass/wiki/Python3Support

Neteler: fix test_session.py script example

2020-07-30T13:58:57Z

fix test_session.py script example

← Older revision		Revision as of 13:58, 30 July 2020
Line 73:		Line 73:

	# create a new location from EPSG code (can also be a GeoTIFF or SHP or ... file)		# create a new location from EPSG code (can also be a GeoTIFF or SHP or ... file)
	with Session(gisdb="/tmp", location="~~location~~",		with Session(gisdb="/tmp", location="mylocation",
	create_opts="EPSG:4326"):		create_opts="EPSG:4326"):
	# do something in ~~permanent~~		# run something in PERMANENT mapset:
	print(gcore.parse_command("g.gisenv", flags="s"))		print(gcore.parse_command("g.gisenv", flags="s"))
			# expected output:
	# {u'GISDBASE': u"'/tmp/';",		# {u'GISDBASE': u"'/tmp/';",
	# u'LOCATION_NAME': u"'~~epsg3035~~';",		# u'LOCATION_NAME': u"'mylocation';",
	# u'MAPSET': u"'PERMANENT';",}		# u'MAPSET': u"'PERMANENT';",}

	# create a new mapset in an existing location		# create a new mapset in an existing location
	with Session(gisdb="/tmp", location="~~location~~", mapset="test",		with Session(gisdb="/tmp", location="mylocation", mapset="test",
	create_opts=""):		create_opts=""):
	# do something in the test mapset.		# do something in the test mapset.
	print(gcore.parse_command("g.gisenv", flags="s"))		print(gcore.parse_command("g.gisenv", flags="s"))
			# expected output:
	# {u'GISDBASE': u"'/tmp/';",		# {u'GISDBASE': u"'/tmp/';",
	# u'LOCATION_NAME': u"'~~epsg3035~~';",		# u'LOCATION_NAME': u"'mylocation';",
	# u'MAPSET': u"'test';",}		# u'MAPSET': u"'test';",}

	</source>		</source>

Line 95:		Line 98:

	<source lang="bash">		<source lang="bash">
			# WAY 1
	# set variable "on the fly" for python call		# set variable "on the fly" for python call
	GRASSBIN="$HOME/bin/grass79 python test_session.py"		GRASSBIN="$HOME/bin/grass79 python test_session.py"

			# WAY 2
			export GRASSBIN="$HOME/bin/grass79"
			python3 test_session.py
			{'GISDBASE': "'/tmp';", 'LOCATION_NAME': "'mylocation';", 'MAPSET': "'PERMANENT';"}
			{'GISDBASE': "'/tmp';", 'LOCATION_NAME': "'mylocation';", 'MAPSET': "'test';"}
	</source>		</source>

Neteler: split into subsection: "Using 'grass-session' with PyGRASS"

2020-07-24T10:47:08Z

split into subsection: "Using 'grass-session' with PyGRASS"

← Older revision		Revision as of 10:47, 24 July 2020
Line 95:		Line 95:

	<source lang="bash">		<source lang="bash">
	GRASSBIN=$HOME/bin/grass79 python test_session.py		# set variable "on the fly" for python call
			GRASSBIN="$HOME/bin/grass79 python test_session.py"
	</source>		</source>

	If you need to use python libraries that are using ctypes, like for example:		See below for a solution with docker.

			====== Using 'grass-session' with PyGRASS ======

			If you need to use python libraries that are using ctypes, run it like this for example:

	<source lang="python">		<source lang="python">

Neteler: /* Python: GRASS GIS 7 with an external library: grass-session */

2020-07-24T10:14:15Z

Python: GRASS GIS 7 with an external library: grass-session

← Older revision		Revision as of 10:14, 24 July 2020
Line 56:		Line 56:
	===== Python: GRASS GIS 7 with an external library: grass-session =====		===== Python: GRASS GIS 7 with an external library: grass-session =====

	The [https://github.com/zarch/grass-session "grass-session" Python library] is ~~under development~~. To ~~contribute at the code, documentation and testing it is possible to~~ install the current version ~~with~~:		The [https://github.com/zarch/grass-session "grass-session" Python library] is an easy way to control GRASS GIS from "outside"-Python. To install the current version, run:

	<source lang="bash">		<source lang="bash">

Neteler: attempt to update misc versions to grass78 (pls verify)

2020-06-25T07:22:19Z

attempt to update misc versions to grass78 (pls verify)

Show changes

Neteler: updated to grass78

2020-06-21T16:28:08Z

updated to grass78

← Older revision		Revision as of 16:28, 21 June 2020
Line 301:		Line 301:

	# Python script to generate a new GRASS GIS 7 location simply from metadata		# Python script to generate a new GRASS GIS 7 location simply from metadata
	# Markus Neteler, 2014		# Markus Neteler, 2014, 2020

	# ?? LINUX USAGE: First set LIBRARY SEARCH PATH		# ?? LINUX USAGE: First set LIBRARY SEARCH PATH
	#export LD_LIBRARY_PATH=$(~~grass72~~ --config path)/lib		#export LD_LIBRARY_PATH=$(grass78 --config path)/lib
	#python start_grass7_create_new_location_ADVANCED.py		#python start_grass7_create_new_location_ADVANCED.py

Line 310:		Line 310:

	# Windows		# Windows
	grass7path = r'C:\OSGeo4W\apps\grass\grass-7.2.svn'		grass7path = r'C:\OSGeo4W\apps\grass\grass-7.8.svn'
	grass7bin_win = r'C:\OSGeo4W\bin\~~grass72svn~~.bat'		grass7bin_win = r'C:\OSGeo4W\bin\grass78svn.bat'
	# Linux		# Linux
	grass7bin_lin = '~~grass72~~'		grass7bin_lin = 'grass78'
	# MacOSX		# MacOSX
	grass7bin_mac = '/Applications/GRASS/GRASS-7.1.app/'		grass7bin_mac = '/Applications/GRASS/GRASS-7.8.app/'
	#myepsg = '4326' # latlong		#myepsg = '4326' # latlong
	myepsg = '3044' # ETRS-TM32, http://spatialreference.org/ref/epsg/3044/		myepsg = '3044' # ETRS-TM32, http://spatialreference.org/ref/epsg/3044/

Neteler: /* Python: GRASS GIS 7 with existing location */ Note: For Python3 support you need to use at least GRASS GIS 7.7. Details are found at https://trac.osgeo.org/grass/wiki/Python3Support

2019-01-26T14:18:01Z

Python: GRASS GIS 7 with existing location: Note: For Python3 support you need to use at least GRASS GIS 7.7. Details are found at https://trac.osgeo.org/grass/wiki/Python3Support

← Older revision		Revision as of 14:18, 26 January 2019
Line 201:		Line 201:
	===== Python: GRASS GIS 7 with existing location =====		===== Python: GRASS GIS 7 with existing location =====

	See the example in the [https://grass.osgeo.org/~~grass72~~/manuals/libpython/script.html#module-script.setup documentation] or the script which initializes the session and lists available raster and vector maps:		See the example in the [https://grass.osgeo.org/grass76/manuals/libpython/script.html#module-script.setup documentation] or the script which initializes the session and lists available raster and vector maps:

			Note: For Python3 support you need to use at least GRASS GIS 7.7. Details are found at https://trac.osgeo.org/grass/wiki/Python3Support

	<source lang="python">		<source lang="python">

⚠️Pietro: Add ctypes examples using grass-session

2018-04-03T13:26:37Z

Add ctypes examples using grass-session

@@ Line 97: / Line 97: @@
 GRASSBIN=$HOME/bin/grass75 python test_session.py
 </source>
 The use of the <tt>with-statement</tt> close automatically the session.