Carlos "Guâno" Grohmann napisał(a):
Hello Firman,
My colleague an I just submitted a paper about a comparison between
GRASS and ArcGIS, using morphometric maps as a base. In general terms,
they both give similar results, except when there was an interpolation
with clustered data (points clustered along streamlines but with
clusters far from each other). In this case, GRASS produced a very
nice result, while ArcGIS made a really bad interpolation.
Other the one hand, I guess some things are easier to do in some
proprietary software, most of them have better map-producing
capabilities than GRASS and GRASS lacks some more interactive tools
(like interactive histogram stretching, color table manipulation for
vector maps etc).
On the other hand, you can do things in GRASS you couldn't even think
about in proprietary GIS. Consider how powerful r.mapcalc is, see the
beauty of a NVIZ session (all my ArcGIS friends are impressed with
NVIZ), or even how easy it is to adapt some piece of code to suit your
needs (I had to do that, I needed larger neighborhoods than
r.neighbors default maximum size - 25 - so I just changed in the code
and recompiled).
my two cents
Carlos
On 7/9/07, Firman Hadi <[EMAIL PROTECTED]> wrote:
Dear all,
One week ago I had a discussion with someone who is expert in remote
sensing.
It was a really nice discussion though we have a different perspective
in using software.
I prefer to use GRASS, because it's an open source software while he
prefer to use
proprietary software. He believed that GRASS can't do some tasks that
proprietary softwares do.
He thought that GRASS is not mature enough to be used. He asked me some
prove that the results from GRASS is the same with proprietary software.
For me, it will be better if I bring actual comparison between GRASS and
proprietary software, though maybe it will take some time.
Is there any link or arguments to give an accurate explanation for such
kind of people?
Thanks.
--
Firman Hadi,
Center for Remote Sensing - ITB
Labtek IXC, 3rd Floor
Jl. Ganesha No. 10
Bandung - INDONESIA
http://crs.itb.ac.id
Blog: http://jalmiburung.wordpress.com
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Well, 'proprietary software' is not synonymus of ArcGIS
in general there is lot of less expensive proprietary software like for
example Idrisi for which (IMHO) grass is real alternative
So If you need arguments there is: Open (and Free) software is very
comparable with less expensive proprietary software
But I'll be rather carefull with comparing GRASS with High-End GIS
software. That software created for big comercial projects, where speed,
visualisation, and simpliyfy of using are most important, in Arc there
are lot of facilities like versioning, geodatabase, coverage with
topology, advanced editing, symbology and so on, which power can be used
only on really big group projects
Addationally, analitical tools in ArcGIS are not the best. The main
assumption of arc is to create rather environment than complete
solution. So there are lot of extension for Arc which are free or can be
bought separetly
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