You can get GRASS data into ArcView/ArcGIS much more simply than this. Vector: use v.out.ogr to export to a shape file
Raster: use r.out.arc OR r.out.gdal to export to an ESRI ASCII grid file Michael On 10/10/07 3:56 PM, "al furqon lebo" <[EMAIL PROTECTED]> wrote: > GRASS Data To ArcView > This document will show the procedure to export GRASS raster and vector data > to > ArcView. > GRASS Vector Data to ArcView 2.1/3.0 > 1) In GRASS use the v.out .ascii command on the vector file you wish to > export. > 2) In GRASS use the v.out.dxf command on the ascii file you created above. > When > GRASS prompts you for a dxf file name, type in the name with extension(i.e. > soils.dxf). The .dxf extension will be needed for ArcView. > Please note that dxf files can only be displayed in ArcView 2.1(MS Windows) > and > ArcView 3.0(UNIX and MS Windows). > 3) To display the dxf file in ArcView you first need to open a VIEW then add a > theme(Feature Data Source). The dxf file should be selectable on the screen. > Open > the dxf file. You have to convert the dxf file to a shapefile in order to > change > projection etc. > GRASS Raster Data To ArcView 2.1/3.0 > This procedure will georeference a raster image within ArcView! > 1) In GRASS use the r.out.tiff command on the Raster file you wish to export. > Use > defaults for the command! In particular DO NOT use the LZW compression! This > may make your file unreadable in ArcView. The GRASS generated TIFF file should > have a tiff extention(i.e. photo1.tif) > 2) After making the TIFF file goto your "cellhd" sub-directory! > 3) Cat the raster cellhd file you exported! You will use the information in > this file to > build a world file. A world file is a ascii file ArcView uses to georeference > information > for the TIFF file you created. With the world file your TIFF file will be > georeference in > ArcView. > 4) Start a vi session, name the file the same as your TIFF file except with a > different > extention! Use the extention .tfw (i.e. photo1.tfw ). You will enter six lines > of > information in your vi session. You can use this file as a base for future > world file. > Below is the possible contents of a typical world file. > 10.0 > 0.0 > 0.0 > -10.0 > 590005 > 4927995 > Below is the possible contents of a typical GRASS cellhd file. > proj: 1 > zone: 16 > north: 4928000.000000 > south: 4914000.000000 > west: 590000.000000 > east: 609000.000000 > n-s resol: 10.000000 > e-w resol: 10.000000 > format: 1 > compressed: 0 > Below is the information you will need to create the above world file(tfw). > Please note > that the world file contains information in your GRASS cellhd file! > Information on the > world file can be found in ArcView 3.0 manual on page 301. > World File GRASS Cellhd File Description > 10.0 "e-w resol:" Size of pixel in x direction. > 0.0 N\A Rotation term for row(usually 0). > 0.0 N\A Rotation term for column(usually 0). > -10.0 "n-s resol:" Size of pixel in y direction(- sign is needed!) > 590005 "west" + 1/2 "e-w resol" The x coordinate of pixel in upper left > corner. * > 4927995 "north" - 1/2 "n-s resol" The y coordinate of pixel in upper left > corner. * > Pixel 1,1 * ArcView georeferences the center of the pixel while GRASS > uses the NW edge in the cellhd file. Thus a slight adjustment is > needed to correctly georeference a TIFF file in ArcView. For these > lines you need to add one half the pixel resolution(west) and subtract > one half the pixel resolution(north). > 5) Place your TIFF and world file in the same directory. These files now can > be used > in ArcView and should be georeferenced correctly!. > A sample world file call be found at the NCG FTP Site! The NCG FTP is listed > below. > ftp.ftw.nrcs.usda.gov (goto the /outgoing directory! and get the file > "base.tfw") > If You have any questions please contact me at your convenience. > Tony Kimmet > (817)-334-5212 x3062 > [EMAIL PROTECTED] > > Michael Barton <[EMAIL PROTECTED]> wrote: >> Re: [GRASS-user] Export of GeoTIFF ESRI needs special GeoTiff options to >> be enabled. These are documented on the r.out.gdal manual page--near the >> bottom where I missed them too awhile back. >> >> Michael >> >> >> On 10/9/07 11:58 PM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> >> wrote: >> >> >>> >>> Dear list, >>> >>> I have serious problems exporting GRASS DCELL rasters to GeoTIFF. >>> I used r.out.gdal with type=Float32 and set the compression to LZW. >>> What I got later on in ArcView 3.3 is pure noise fort he picture and in >>> ArcGIS 9.2 I get some strange results. >>> The NULL values of the picture get a cryptic code like -1#QUAN1 and if >>> there are pixels with value 0 they become NoData in ArcGIS. >>> >>> I need to have them as GeoTIFFs for the easy im- and export. I am aware >>> that I can also use r.out.ascii but then I have to do an import procedure in >>> ArcGIS. For nearly 1000 images that is a bit hard to do. >>> >>> Any hints for the export options? >>> >>> Thx in advance, >>> Christian >>> >>> >>> _________________________________________ >>> >>> Dipl. Geogr. Christian Braun >>> Tel: +352- 425991-608 >>> Mobil: +49-179-6845896 >>> Mail: [EMAIL PROTECTED] >>> >>> Resource Centre for Environmental Technologies, >>> Public Research Centre Henri Tudor, >>> Technoport Schlassgoart, >>> 66 rue de Luxembourg, >>> P.O. BOX 144, >>> L-4002 Esch-sur-Alzette, Luxembourg >>> >> >> >> __________________________________________ >> Michael Barton, Professor of Anthropology >> Director of Graduate Studies >> School of Human Evolution & Social Change >> Center for Social Dynamics & Complexity >> Arizona State University >> >> phone: 480-965-6213 >> fax: 480-965-7671 >> www: http://www.public.asu.edu/~cmbarton >> <http://www.public.asu.edu/%7Ecmbarton> >> >> _______________________________________________ >> grassuser mailing list >> grassuser@grass.itc.it >> http://grass.itc.it/mailman/listinfo/grassuser > > > > your sincerely > > alf > -_-____02053 > > > > Building a website is a piece of cake. > Yahoo! Small Business gives you all the tools to get online. > <http://us.rd.yahoo.com/evt=48251/*http://smallbusiness.yahoo.com/webhosting/? > p=PASSPORTPLUS> __________________________________________ Michael Barton, Professor of Anthropology Director of Graduate Studies School of Human Evolution & Social Change Center for Social Dynamics and Complexity Arizona State University phone: 480-965-6213 fax: 480-965-7671 www: http://www.public.asu.edu/~cmbarton
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