<html><body><div style="color:#000; background-color:#fff; font-family:garamond, new york, times, serif;font-size:18pt"><div><span>Thanks so much Michael for the advice that has made me more excited about learning grass. With Arc, i have always prefered working on raster except when it has to be vector, therefore Grass should be more exciting to work with. <br></span></div><div><span>Could you be having some tutorials or links to tutorials and manuals for beginers that you can share with me. Would greatly appreciate your assistance on this.</span></div><div><span>Thanks so much once again Michael. Looking forward to hearing from you. Also hoping to receive more advice and links from the group.<br></span></div><div><br><span></span></div><div><span>Kind regards<br></span></div><div> </div><div><font color="#0000ff">Nyolei </font><font color="#0000ff">Douglas Kipkorir <br></font><br></div> <div style="font-family: garamond, new york, times,
serif; font-size: 18pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> "grass-user-request@lists.osgeo.org" <grass-user-request@lists.osgeo.org><br> <b><span style="font-weight: bold;">To:</span></b> grass-user@lists.osgeo.org <br> <b><span style="font-weight: bold;">Sent:</span></b> Sunday, March 25, 2012 9:00 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> grass-user Digest, Vol 71, Issue 63<br> </font> </div> <br>
Send grass-user mailing list submissions to<br> <a ymailto="mailto:grass-user@lists.osgeo.org" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a><br><br>To subscribe or unsubscribe via the World Wide Web, visit<br> http://lists.osgeo.org/mailman/listinfo/grass-user<br>or, via email, send a message with subject or body 'help' to<br> <a ymailto="mailto:grass-user-request@lists.osgeo.org" href="mailto:grass-user-request@lists.osgeo.org">grass-user-request@lists.osgeo.org</a><br><br>You can reach the person managing the list at<br> <a ymailto="mailto:grass-user-owner@lists.osgeo.org" href="mailto:grass-user-owner@lists.osgeo.org">grass-user-owner@lists.osgeo.org</a><br><br>When replying, please edit your Subject line so it is more specific<br>than "Re: Contents of grass-user digest..."<br><br><br>Today's Topics:<br><br> 1. Re: New GRASS user (Michael
Barton)<br><br><br>----------------------------------------------------------------------<br><br>Message: 1<br>Date: Sun, 25 Mar 2012 09:53:18 -0600<br>From: Michael Barton <<a ymailto="mailto:michael.barton@asu.edu" href="mailto:michael.barton@asu.edu">michael.barton@asu.edu</a>><br>Subject: Re: [GRASS-user] New GRASS user<br>To: "<a ymailto="mailto:grass-user@lists.osgeo.org" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a>" <<a ymailto="mailto:grass-user@lists.osgeo.org" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a>><br>Message-ID: <<a ymailto="mailto:14C4309F-922B-4909-B560-62A7B354A7FC@asu.edu" href="mailto:14C4309F-922B-4909-B560-62A7B354A7FC@asu.edu">14C4309F-922B-4909-B560-62A7B354A7FC@asu.edu</a>><br>Content-Type: text/plain; charset=windows-1252<br><br>I'm sure that others have their own perspective but when I talk with someone familiar with Arc, who is thinking about using
GRASS, I usually emphasize 2 things.<br><br>1. Although Arc has both vector and raster capabilities, most people who use it 'think vector' when they work with the GIS. It is often easier to convert to vector to work with geospatial data for many applications. GRASS is just the opposite. It has powerful vector tools, but for many applications it is easier to work in raster. So you need to 'think raster'. <br><br>2. Arc works like a word processor in that you can start the program without any data and then load various data files. Arc will attempt to overlay them by reprojecting on-the-fly. In other words, you don't need to know anything about your geospatial data to get Arc started. GRASS doesn't work this way. You need to know something about your data and make a choice about what kind of projection you will be working with (even an arbitrary xy representation) before you can even start GRASS. That is, you must make a choice of which "location" you will
work with (a location representing a body of geospatial data in a particular projection—including geographic and xy) before you can start GRASS. GRASS has powerful tools for creating a location fairly easily. But I usually advise people to download the demo data so that they have a pre-made location to work with for exploring GRASS.<br><br>Both Arc and GRASS have very similar capabilities. I think it is easier to do vector things in Arc and easier to do raster things in GRASS. Arc has somewhat better cartographic capabilities, but GRASS is getting much better at this. Overall, GRASS functions are more accessible than those of ArcGIS. All are within 2 menu levels, and none are hidden inside a separate toolbox. Also GRASS algorithms are all MUCH more accessible than are those of ArcGIS. It is difficult to know what is going on beneath the proprietary GIS functions in Arc, but GRASS not only exposes the algorithms in its open code base, but also provides
references to nearly all algorithms in its excellent on-line help. <br><br>Arc has a control window (i.e., for layers) attached to every display window. GRASS has a single control window (that includes layer management as well as command console if you prefer it over a GUI approach) for all of its displays. I like the GRASS approach better (naturally) but a lot of people like the Arc approach. I guess it's a matter of opinion and your personal work flows.<br><br>One thing that I can say is that when I work with people who are familiar with Arc, I often can solve complex problems in geospatial data analysis more readily with GRASS than they can with Arc. It certainly works very well for my research and teaching needs. <br><br>Finally, GRASS runs on Linux, Unix, Mac, and Windows; Arc runs on Windows only.<br><br>I hope this is helpful<br>Michael<br><br><br>On Mar 25, 2012, at 6:59 AM, <<a ymailto="mailto:grass-user-request@lists.osgeo.org"
href="mailto:grass-user-request@lists.osgeo.org">grass-user-request@lists.osgeo.org</a>> wrote:<br><br>> Date: Sun, 25 Mar 2012 04:34:49 -0700 (PDT)<br>> From: DOUGLAS NYOLEI <<a ymailto="mailto:dnyolei@yahoo.com" href="mailto:dnyolei@yahoo.com">dnyolei@yahoo.com</a>><br>> Subject: [GRASS-user] New GRASS user<br>> To: "<a ymailto="mailto:grass-user@lists.osgeo.org" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a>" <<a ymailto="mailto:grass-user@lists.osgeo.org" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a>><br>> Message-ID:<br>> <<a ymailto="mailto:1332675289.4397.YahooMailNeo@web161703.mail.bf1.yahoo.com" href="mailto:1332675289.4397.YahooMailNeo@web161703.mail.bf1.yahoo.com">1332675289.4397.YahooMailNeo@web161703.mail.bf1.yahoo.com</a>><br>> Content-Type: text/plain; charset="iso-8859-1"<br>> <br>> Dear all,<br>> <br>> My
Name is Douglas and I am a new GRASS GIS user. I have been a very active user of ESRI products. Therefore the GIS field is not at all new to me. I have recently been attracted to GRASS GIS because of its strength on Remote sensing with tools that are of great interest to me having been built within GIPE.<br>> <br>> I have recently installed GRASS GIS 7.0 in my laptop and over the past week I have been trying to understand how it works. I would therefore greatly appreciate words of advice from other users on getting started with it especially through links to tutorials and manuals. For now my interest is mainly Evapotranspiration estimation from Landsat Images.<br>> I look forward to hearing from you and becoming a more active Grass user.<br>> <br>> Kind regards<br>> <br>> ?Douglas<br><br>_____________________<br>C. Michael Barton<br>Visiting Scientist, Integrated Science Program<br>National Center for Atmospheric Research
&<br>University Consortium for Atmospheric Research<br>303-497-2889 (voice)<br><br>Director, Center for Social Dynamics & Complexity <br>Professor of Anthropology, School of Human Evolution & Social Change<br>Arizona State University<br>www: <a href="http://www.public.asu.edu/%7Ecmbarton" target="_blank">http://www.public.asu.edu/~cmbarton</a>, <a href="http://csdc.asu.edu" target="_blank">http://csdc.asu.edu</a><br><br><br><br><br><br><br><br>------------------------------<br><br>_______________________________________________<br>grass-user mailing list<br><a ymailto="mailto:grass-user@lists.osgeo.org" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a><br><a href="http://lists.osgeo.org/mailman/listinfo/grass-user" target="_blank">http://lists.osgeo.org/mailman/listinfo/grass-user</a><br><br><br>End of grass-user Digest, Vol 71, Issue 63<br>******************************************<br><br><br> </div> </div>
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