Import XYZ - Revision history

Neteler at 14:54, 20 December 2012

2012-12-20T14:54:13Z

← Older revision		Revision as of 14:54, 20 December 2012
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	[[Category:Documentation]]		[[Category:Documentation]]
	[[Category:FAQ]]		[[Category:FAQ]]
			[[Category: Import]]

⚠️Erget at 17:12, 2 December 2011

2011-12-02T17:12:30Z

← Older revision		Revision as of 17:12, 2 December 2011
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	There are a couple of ways to import regular DEM (elevation) data in gridded XYZ ASCII format:		There are a couple of ways to import regular DEM (elevation) data in gridded XYZ ASCII format:
	* use {{cmd\|v.in.ascii}}, then {{cmd\|r.to.~~vect~~}}		* use {{cmd\|v.in.ascii}}, then {{cmd\|v.to.rast}}
	* use {{cmd\|r.in.xyz}} along with {{cmd\|g.region}}		* use {{cmd\|r.in.xyz}} along with {{cmd\|g.region}}

⚠️HamishBowman: /* See also */

2010-06-05T09:55:30Z

⚠️HamishBowman: /* See also */

2010-06-05T09:53:42Z

⚠️HamishBowman: /* Import with r.in.xyz */ troubleshooting

2010-06-05T09:50:48Z

Import with r.in.xyz: troubleshooting

← Older revision		Revision as of 09:50, 5 June 2010
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	It indicates a 25m raster cell size. To import, we run a few commands:		It indicates a 25m raster cell size. To import, we run a few commands:

	# First scan the map extent in human readable way (reduce white space on the		* First scan the map extent in human readable way (reduce white space on the fly, read from standard-input):
	# fly, read from standard-input):
	cat VTL2733.XYZ\| r.in.xyz -s in=- fs=space out=test		cat VTL2733.XYZ\| r.in.xyz -s in=- fs=space out=test
	Range: min max		Range: min max
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	z: 149.160000 162.150000		z: 149.160000 162.150000

	# set region, get from scanning the file again, now in machine-readable form		* set region, get from scanning the file again, now in machine-readable form
	# (eval and -g flag):		# (eval and -g flag):
	eval `cat VTL2733.XYZ \| r.in.xyz -s -g in=- fs=space out=test`		eval `cat VTL2733.XYZ \| r.in.xyz -s -g in=- fs=space out=test`
	g.region n=$n s=$s w=$w e=$e res=25 -p		g.region n=$n s=$s w=$w e=$e res=25 -p

	# enlarge region by half raster cell resolution to store values in cell-center:		* enlarge region by half raster cell resolution to store values in cell-center:
	g.region n=n+12.5 s=s-12.5 w=w-12.5 e=e+12.5 -p		g.region n=n+12.5 s=s-12.5 w=w-12.5 e=e+12.5 -p

	# verify that the number of rows in the ASCII file corresponds to the number		* verify that the number of rows in the ASCII file corresponds to the number of cells in enlarged region
	# of cells in enlarged region
	wc -l VTL2733.XYZ		wc -l VTL2733.XYZ

	# finally import as raster map:		* finally import as raster map:
	cat VTL2733.XYZ \| r.in.xyz in=- fs=space out=vtl2733		cat VTL2733.XYZ \| r.in.xyz in=- fs=space out=vtl2733

	# and confirm that it all went cleanly, indicated by the absence of NULL cells:		* and confirm that it all went cleanly, indicated by the absence of NULL cells:
	r.univar vtl2733		r.univar vtl2733

	Now you can analyse the imported elevation map or export into a reasonable raster format (e.g., GeoTIFF) with {{cmd\|r.out.gdal}}.		Now you can analyse the imported elevation map or export into a reasonable raster format (e.g., GeoTIFF) with {{cmd\|r.out.gdal}}.

			Inspecting the output of {{cmd\|r.univar}} with r.in.xyz's <tt>method=n</tt> maps can be very useful for troubleshooting.

	=== Import multiple files in one step into a single DEM ===		=== Import multiple files in one step into a single DEM ===

Neteler: /* Import multiple files in one step */

2009-05-18T07:04:48Z

Import multiple files in one step

← Older revision		Revision as of 07:04, 18 May 2009
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	Now you can analyse the imported elevation map or export into a reasonable raster format (e.g., GeoTIFF) with {{cmd\|r.out.gdal}}.		Now you can analyse the imported elevation map or export into a reasonable raster format (e.g., GeoTIFF) with {{cmd\|r.out.gdal}}.

	=== Import multiple files in one step ===		=== Import multiple files in one step into a single DEM ===

	Just amend above procedure to use wildcards.		Just amend above procedure to use wildcards.

Neteler: /* Import multiple files in one step */

2009-05-13T07:07:04Z

Import multiple files in one step

← Older revision		Revision as of 07:07, 13 May 2009
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	Change in above example all occurencies of		Change in above example all occurencies of

	cat VTL2733.XYZ		cat VTL2733.XYZ \| ...
	to		to
	cat *.XYZ		cat *.XYZ \| ...

	and use a more reasonable output name of course. That's all to import even thousands of files (tiled DEM) easily.		and use a more reasonable output name of course. That's all to import even thousands of files (tiled DEM) easily.

⚠️HamishBowman: /* See also */

2009-05-13T06:56:24Z

⚠️HamishBowman: /* See also */ ++

2009-05-13T06:38:34Z

⚠️HamishBowman: /* Import with r.in.xyz */ confirm with r.univar

2009-05-13T06:34:21Z

Import with r.in.xyz: confirm with r.univar

← Older revision		Revision as of 06:34, 13 May 2009
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	# finally import as raster map:		# finally import as raster map:
	cat VTL2733.XYZ \| r.in.xyz in=- fs=space out=vtl2733		cat VTL2733.XYZ \| r.in.xyz in=- fs=space out=vtl2733

			# and confirm that it all went cleanly, indicated by the absence of NULL cells:
			r.univar vtl2733

	Now you can analyse the imported elevation map or export into a reasonable raster format (e.g., GeoTIFF) with {{cmd\|r.out.gdal}}.		Now you can analyse the imported elevation map or export into a reasonable raster format (e.g., GeoTIFF) with {{cmd\|r.out.gdal}}.

← Older revision		Revision as of 09:55, 5 June 2010
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	* The [[LIDAR]] wiki page (discusses the import of ''sparse'' XYZ datasets)		* The [[LIDAR]] wiki page (discusses the import of ''sparse'' XYZ datasets)
	* The [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.in.xyz.auto r.in.xyz.auto] add-on script		* The [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.in.xyz.auto r.in.xyz.auto] add-on script
	* [https://trac.osgeo.org/grass/query?status=new&status=assigned&status=reopened&keywords=%7Er.in.xyz Open ~~bugs~~ concerning r.in.xyz]		* [https://trac.osgeo.org/grass/query?status=new&status=assigned&status=reopened&keywords=%7Er.in.xyz Open support tickets concerning r.in.xyz]

	[[Category:Documentation]]		[[Category:Documentation]]
	[[Category:FAQ]]		[[Category:FAQ]]

← Older revision		Revision as of 09:53, 5 June 2010
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	* The [[LIDAR]] wiki page (discusses the import of ''sparse'' XYZ datasets)		* The [[LIDAR]] wiki page (discusses the import of ''sparse'' XYZ datasets)
	* The [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.in.xyz.auto r.in.xyz.auto] add-on script		* The [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.in.xyz.auto r.in.xyz.auto] add-on script
			* [https://trac.osgeo.org/grass/query?status=new&status=assigned&status=reopened&keywords=%7Er.in.xyz Open bugs concerning r.in.xyz]

	[[Category:Documentation]]		[[Category:Documentation]]
	[[Category:FAQ]]		[[Category:FAQ]]

← Older revision		Revision as of 06:56, 13 May 2009
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	* [http://tldp.org/LDP/abs/html/textproc.html Text Processing Commands]		* [http://tldp.org/LDP/abs/html/textproc.html Text Processing Commands]
	* [http://www.gnu.org/software/coreutils/manual/html_node/index.html GNU Coreutils]		* [http://www.gnu.org/software/coreutils/manual/html_node/index.html GNU Coreutils]
	* The [[LIDAR]] wiki page		* The [[LIDAR]] wiki page (discusses the import of ''sparse'' XYZ datasets)
	* The [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.in.xyz.auto r.in.xyz.auto] add-on script		* The [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.in.xyz.auto r.in.xyz.auto] add-on script

	[[Category:Documentation]]		[[Category:Documentation]]
	[[Category:FAQ]]		[[Category:FAQ]]

← Older revision		Revision as of 06:38, 13 May 2009
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	* [http://tldp.org/LDP/abs/html/textproc.html Text Processing Commands]		* [http://tldp.org/LDP/abs/html/textproc.html Text Processing Commands]
	* [http://www.gnu.org/software/coreutils/manual/html_node/index.html GNU Coreutils]		* [http://www.gnu.org/software/coreutils/manual/html_node/index.html GNU Coreutils]
			* The [[LIDAR]] wiki page
			* The [http://trac.osgeo.org/grass/browser/grass-addons/raster/r.in.xyz.auto r.in.xyz.auto] add-on script

	[[Category:Documentation]]		[[Category:Documentation]]
	[[Category:FAQ]]		[[Category:FAQ]]