Tips for Arc users: Difference between revisions

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'''Example 1: Import of Shapefiles into Grass'''
=== Vector import/export commands ===
 
* [http://grass.ibiblio.org/grass61/manuals/html61_user/v.in.ogr.html v.in.ogr] - Convert [http://www.gdal.org/ogr OGR] supported vector formats to GRASS vector format.
 
* [http://grass.ibiblio.org/grass61/manuals/html61_user/v.out.ogr.html v.out.ogr] - Convert from the GRASS vector format to one of the supported OGR vector formats.
 
* [http://grass.ibiblio.org/grass61/manuals/html61_user/v.in.e00.html v.in.e00] - Import a E00 coverage into a GRASS vector map.
 
 
==== Import of Shapefiles into Grass ====


specify the directory
specify the directory
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This is the syntax for v.in.ogr in its most basic form. The ''dsn'' parameter corresponds to the directory path of the vector you are trying to import. You can enter a full or relative path. The ''output'' paramter, aptly enough, is the name of your output Grass vector. The ''layer'' parameter is the name of the input vector, be it shapefile, MapInfo file, or what have you.
This is the syntax for v.in.ogr in its most basic form. The ''dsn'' parameter corresponds to the directory path of the vector you are trying to import. You can enter a full or relative path. The ''output'' paramter, aptly enough, is the name of your output Grass vector. The ''layer'' parameter is the name of the input vector, be it shapefile, MapInfo file, or what have you.
==== Export of Shapefiles from GRASS ====
Export lines from GRASS vector map to Shapefile format (generates /tmp/testogr.shp and related files):
v.out.ogr input=multi type=line dsn=/tmp olayer=testogr
Export areas from GRASS vector map to Shapefile format (generates /tmp/testogr.shp and related files):
v.out.ogr input=multi type=area dsn=/tmp olayer=testogr
Export 3D lines from GRASS vector map to Shapefile format:
v.out.ogr input=lines_3d type=line dsn=/tmp olayer=testogr lco="SHPT=ARCZ"


=== Raster import/export commands ===
=== Raster import/export commands ===
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** Export a raster as a GeoTIFF for use with ArcView 3.1:
** Export a raster as a GeoTIFF for use with ArcView 3.1:
  r.out.gdal in=map out=map.tif type=Byte createopt="INTERLEAVE=PIXEL,COMPRESS=PACKBITS"
  r.out.gdal in=map out=map.tif type=Byte createopt="INTERLEAVE=PIXEL,COMPRESS=PACKBITS"
=== Vector import/export commands ===
* [http://grass.ibiblio.org/grass61/manuals/html61_user/v.in.ogr.html v.in.ogr] - Convert [http://www.gdal.org/ogr OGR] supported vector formats to GRASS vector format.
* [http://grass.ibiblio.org/grass61/manuals/html61_user/v.out.ogr.html v.out.ogr] - Convert from the GRASS vector format to one of the supported OGR vector formats.
* [http://grass.ibiblio.org/grass61/manuals/html61_user/v.in.e00.html v.in.e00] - Import a E00 coverage into a GRASS vector map.


== See also ==
== See also ==

Revision as of 02:21, 21 November 2007

Working with your ArcGIS data

Importing ArcGIS Data


Grass provides convertors for importing ESRI shapefiles, e00 files, and many other GIS formats as well. The key Grass programs for importing vector formats are v.in.ogr (for ESRI shapefiles, MapInfo files, SDTS, TIGER, etc.) and v.in.e00 for e00 format.


Vector import/export commands

  • v.in.ogr - Convert OGR supported vector formats to GRASS vector format.
  • v.out.ogr - Convert from the GRASS vector format to one of the supported OGR vector formats.
  • v.in.e00 - Import a E00 coverage into a GRASS vector map.


Import of Shapefiles into Grass

specify the directory 

v.in.ogr dsn=/home/data/navigation_files output=Tracklines layer=Ship_Tracklines

or just the .shp file name directly 

v.in.ogr dsn=Ship_Tracklines.shp output=Tracklines

This is the syntax for v.in.ogr in its most basic form. The dsn parameter corresponds to the directory path of the vector you are trying to import. You can enter a full or relative path. The output paramter, aptly enough, is the name of your output Grass vector. The layer parameter is the name of the input vector, be it shapefile, MapInfo file, or what have you.

Export of Shapefiles from GRASS

Export lines from GRASS vector map to Shapefile format (generates /tmp/testogr.shp and related files): 

v.out.ogr input=multi type=line dsn=/tmp olayer=testogr

Export areas from GRASS vector map to Shapefile format (generates /tmp/testogr.shp and related files): 

v.out.ogr input=multi type=area dsn=/tmp olayer=testogr

Export 3D lines from GRASS vector map to Shapefile format: 

v.out.ogr input=lines_3d type=line dsn=/tmp olayer=testogr lco="SHPT=ARCZ"


Raster import/export commands

  • r.in.arc - Convert an ESRI ARC/INFO ascii raster file (GRID) into a GRASS (binary) raster map layer.
  • r.out.arc - Converts a GRASS raster map layer into an ESRI ARCGRID file.
  • r.in.gdal - Import GDAL supported raster file into a binary raster map layer.
    • Import a binary ArcInfo raster grid into GRASS:
r.in.gdal in=/path/to/map.hdr out=map
  • r.out.gdal - Exports GRASS raster data into various formats.
    • Export a raster as a GeoTIFF for use with ArcView 3.1:
r.out.gdal in=map out=map.tif type=Byte createopt="INTERLEAVE=PIXEL,COMPRESS=PACKBITS"

See also

GRASS migration hints

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