Importing data - Revision history

Neteler: /* Modules */

2023-01-20T11:50:05Z

Modules

← Older revision		Revision as of 11:50, 20 January 2023
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	=== Modules ===		=== Modules ===

			Besides the standard tools {{cmd\|r.import}} and {{cmd\|v.import}}, GRASS GIS provides some addition specialized import tools for specific formats:

	==== Raster ====		==== Raster ====
	* {{cmd\|r.in.arc}}		* {{cmd\|r.in.arc}}

Neteler: advertise r.import/v.import

2023-01-20T11:48:31Z

advertise r.import/v.import

← Older revision		Revision as of 11:48, 20 January 2023
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	The primary import/export tool is called [http://www.gdal.org GDAL/OGR]. It is the Rosetta Stone of the free GIS world:		The primary import/export tool is called [http://www.gdal.org GDAL/OGR]. It is the Rosetta Stone of the free GIS world:

	* [http://www.gdal.org/formats_list.html Supported raster formats] via {{cmd\|r.~~in.gdal~~}} (for example importing GeoTiffs)		* [http://www.gdal.org/formats_list.html Supported raster formats] via {{cmd\|r.import}} (for example importing GeoTiffs)
	* [http://www.gdal.org/ogr/ogr_formats.html Supported vector formats] via {{cmd\|v.~~in.ogr~~}} (for example importing Shapefiles)		* [http://www.gdal.org/ogr/ogr_formats.html Supported vector formats] via {{cmd\|v.import}} (for example importing Shapefiles)

	=== Creating a new location from a data set ===		=== Creating a new location from a data set ===

Neteler: improvements

2014-03-11T16:23:55Z

improvements

← Older revision		Revision as of 16:23, 11 March 2014
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	* [http://www.gdal.org/ogr/ogr_formats.html Supported vector formats] via {{cmd\|v.in.ogr}} (for example importing Shapefiles)		* [http://www.gdal.org/ogr/ogr_formats.html Supported vector formats] via {{cmd\|v.in.ogr}} (for example importing Shapefiles)

			=== Creating a new location from a data set ===

	~~Create a new location for your data with the correct map projection using~~ the Location Wizard ~~on the main startup screen^, then in the menus:~~		'''New users:''' simply use the [[GRASS Location Wizard]].
	~~Raster formats: File → Import raster data using GDAL~~
	~~Vector formats: File → Import vector data using OGR~~

	~~Typically GDAL/OGR will automatically detect the file format for you.~~		'''Background:'''

	* [^] You must create a new GRASS ''~~location~~'' for each map projection you will work with or import data from. If you want the data reprojected into something else you'll have to create that target map projection in a ''location'' and pull them into there with {{cmd\|r.proj}} and {{cmd\|v.proj}}, or use [[GDAL]]'s <tt>gdalwarp</tt> or <tt>ogr2ogr</tt> command line tools.
	: [''~~read more about this on the {{cmd\|projectionintro}} help page~~'']

			Create a new location for your data with the correct map projection using the Location Wizard on the main startup screen^, then in the menus (typically GDAL/OGR will automatically detect the file format for you):
			* Raster formats: File → Import raster data (internally using GDAL)
			* Vector formats: File → Import vector data (internally using OGR)

			'''Power users:'''
			* [^] For each map projection you must create a new GRASS ''location''. If you want the data reprojected into something else you'll have to create that target map projection in a ''location'' and pull them into there with {{cmd\|r.proj}} and {{cmd\|v.proj}}, or use [[GDAL]]'s <tt>gdalwarp</tt> or <tt>ogr2ogr</tt> command line tools.
			: ''read more about this on the {{cmd\|projectionintro}} help page''
	* Many [http://www.gpsbabel.org/capabilities.shtml GPS formats] can imported with [http://www.gpsbabel.org GPSBabel] as well using the {{cmd\|v.in.gpsbabel}} tool.		* Many [http://www.gpsbabel.org/capabilities.shtml GPS formats] can imported with [http://www.gpsbabel.org GPSBabel] as well using the {{cmd\|v.in.gpsbabel}} tool.
	* CSV files from a spreadsheet can be imported with the {{cmd\|v.in.ascii}} module.		* CSV files from a spreadsheet can be imported with the {{cmd\|v.in.ascii}} module.
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	** If your .csv file contains "quoted" strings containing commas, you can use the [[AddOns#Miscellaneous_Add-ons\|csv_dequote.pl]] script to parse them into a less-problematic form ready for import with {{cmd\|v.in.ascii}}.		** If your .csv file contains "quoted" strings containing commas, you can use the [[AddOns#Miscellaneous_Add-ons\|csv_dequote.pl]] script to parse them into a less-problematic form ready for import with {{cmd\|v.in.ascii}}.

			=== What's next after creating a new location from a data set ===
	After the map has been imported you can add it to the display layer list in the Layer Manager window. You will most likely want to right click on the map in the layer list and select "Zoom to selected map(s)". Otherwise when you go to view the map you could be far away and just see a white display canvas.		After the map has been imported you can add it to the display layer list in the Layer Manager window. You will most likely want to right click on the map in the layer list and select "Zoom to selected map(s)". Otherwise when you go to view the map you could be far away and just see a white display canvas.

Neteler: +Troubleshooting of "ERROR: Projection of dataset does not appear to match current location"

2014-02-08T23:38:07Z

+Troubleshooting of "ERROR: Projection of dataset does not appear to match current location"

← Older revision		Revision as of 23:38, 8 February 2014
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	* [[Import_Mio_C230_GPS_track_maps\|Mio GPS tracks]]		* [[Import_Mio_C230_GPS_track_maps\|Mio GPS tracks]]

			== Troubleshooting ==

			'''Q:''' GRASS GIS is giving an "ERROR: Projection of dataset does not appear to match current location". What should I do ?

			'''A:''' In GRASS GIS, each location can have only one projection (to avoid quality loss in projection-on-the-fly approaches). To create a new location from the data set, simply use the [[GRASS Location Wizard]].

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

⚠️HamishBowman: /* Modules */ r.in.gdal memory hint

2014-01-24T00:01:28Z

Modules: r.in.gdal memory hint

← Older revision		Revision as of 00:01, 24 January 2014
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	\|}		\|}
	</center>		</center>

			=== Large data ===

			When importing large raster maps with {{cmd\|r.in.gdal}} the default internal settings may be slow, with a large percentage of the CPU locked up in kernel system operations. In these cases you should increase the ''memory='' option to be larger than:
			tile_height * raster_width * band_count * sizeof_datatype

			You can find those values with <tt>gdalinfo</tt>.

			Setting the ''r.in.gdal memory='' option has the same effect as setting the GDAL_CACHEMAX environment variable.

	=== Modules ===		=== Modules ===

Neteler: +category

2013-06-02T19:47:29Z

+category

← Older revision		Revision as of 19:47, 2 June 2013
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	[[Category: Documentation]]		[[Category: Documentation]]
	[[Category: FAQ]]		[[Category: FAQ]]
			[[Category: Import]]

Neteler: /* Data formats */

2012-08-23T19:41:05Z

Data formats

← Older revision		Revision as of 19:41, 23 August 2012
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	* {{cmd\|v.in.sites.all}}		* {{cmd\|v.in.sites.all}}

	=== Data formats ===		== Data formats ==

	* Various common [[Data formats]]		* Various common [[Data formats]]

⚠️HamishBowman: /* Getting your data into GRASS */ csv_dequote.pl

2012-06-18T00:31:58Z

Getting your data into GRASS: csv_dequote.pl

← Older revision		Revision as of 00:31, 18 June 2012
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	* Many [http://www.gpsbabel.org/capabilities.shtml GPS formats] can imported with [http://www.gpsbabel.org GPSBabel] as well using the {{cmd\|v.in.gpsbabel}} tool.		* Many [http://www.gpsbabel.org/capabilities.shtml GPS formats] can imported with [http://www.gpsbabel.org GPSBabel] as well using the {{cmd\|v.in.gpsbabel}} tool.
	* CSV files from a spreadsheet can be imported with the {{cmd\|v.in.ascii}} module.		* CSV files from a spreadsheet can be imported with the {{cmd\|v.in.ascii}} module.
	: ({{cmd\|v.in.ogr}} could too, but it's not as smooth)		*: ({{cmd\|v.in.ogr}} could too, but it's not as smooth)
			** If your .csv file contains "quoted" strings containing commas, you can use the [[AddOns#Miscellaneous_Add-ons\|csv_dequote.pl]] script to parse them into a less-problematic form ready for import with {{cmd\|v.in.ascii}}.

Neteler: +screenshots

2012-04-01T18:55:05Z

+screenshots

@@ Line 47: / Line 47: @@
 === Bulk data import ===
-* wxGUI menu tools
+The [[wxGUI]] menu tools offer simplified import.
 === Modules ===

Neteler: +Import Video Tutorials

2012-04-01T18:46:29Z

+Import Video Tutorials

← Older revision		Revision as of 18:46, 1 April 2012
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	\| After importing your data you need to run "<tt>g.region -p rast=your_map</tt>" or "<tt>g.region -p vect=your_map</tt>" to set the region bounds/zoom to match that of the newly imported map. Be careful with the region resolution when doing this with vector maps, you may have to run "<tt>g.region -a res=</tt>" to clean that up and keep it reasonable (for example 2000x2000 rows and columns).		\| After importing your data you need to run "<tt>g.region -p rast=your_map</tt>" or "<tt>g.region -p vect=your_map</tt>" to set the region bounds/zoom to match that of the newly imported map. Be careful with the region resolution when doing this with vector maps, you may have to run "<tt>g.region -a res=</tt>" to clean that up and keep it reasonable (for example 2000x2000 rows and columns).
	\|}		\|}

			=== Import Video Tutorials ===

			* See [[WxGUI#Video_tutorials]]

	=== External links ===		=== External links ===

	* {{cmd\|r.external}}		You can just link to the data rather than importing them.
	* {{cmd\|v.external}}
			* {{cmd\|r.external}}: full support for external raster data (all GDAL supported formats)
			* {{cmd\|v.external}}: basic support for external vector data with some topology limitations (all OGR supported formats)

	=== Bulk data import ===		=== Bulk data import ===

← Older revision		Revision as of 00:31, 18 June 2012
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	* Many [http://www.gpsbabel.org/capabilities.shtml GPS formats] can imported with [http://www.gpsbabel.org GPSBabel] as well using the {{cmd\|v.in.gpsbabel}} tool.		* Many [http://www.gpsbabel.org/capabilities.shtml GPS formats] can imported with [http://www.gpsbabel.org GPSBabel] as well using the {{cmd\|v.in.gpsbabel}} tool.
	* CSV files from a spreadsheet can be imported with the {{cmd\|v.in.ascii}} module.		* CSV files from a spreadsheet can be imported with the {{cmd\|v.in.ascii}} module.
	: ({{cmd\|v.in.ogr}} could too, but it's not as smooth)		*: ({{cmd\|v.in.ogr}} could too, but it's not as smooth)
			** If your .csv file contains "quoted" strings containing commas, you can use the [[AddOns#Miscellaneous_Add-ons\|csv_dequote.pl]] script to parse them into a less-problematic form ready for import with {{cmd\|v.in.ascii}}.