Re: [Openev-discuss] Open EV Add-ons

[Sampson, D. <dsampson@NRCan.gc.ca>]

Nate,
=20
I have been using GRASS for about 8 years off an on and have used the
CYGWIN build and now working with fedora RPMs... if you need a hand I
can help out perhaps. Also check out the GRASS chats, lots of great
resources there to help.
=20
For the install you might be able to set everything up througha  dosc
BAT script and give the script for a student to run.... perhaps that
will tame the beast.. GRASS is a great choice.
=20
About OpenEV...
=20
Well about 6 months ago I knew how to write hello world programs with
python and VB... and because of work I am about to convert a vb6 app to
python... should be fun. but I am novice with python and OO programming.
=20
That said I wanted to build a small tool for a QC process of georefed
aerial photos within my project. So I took OpenEV, purchased an Oreily
PYHTON books, created a tool, made a GTK dialogue box and was off to the
races.... it just took me a all a couple of weeks of fidling. So with
your PYHTON experieince you'd probably be good to go.
=20
One thing about your thought on code migration. My understanding is that
what you SHOULD do with your C code is build a C library and create
python bindings. no idea how you do that though. That way you get the
advantage of great C processing power and flexibility of python
develpment.
=20
Also if you're working outside of FWTOOLS but using python check out
GLADE for GUI's... kinda cool.  I will use a VB6 to GLADE conversion
process for the application GUI and then a VB6 to python conversion
process for the code logic.
=20
those are thoughts from another newbie.
=20
Cheers

________________________________

From: ope...@li...
[mailto:ope...@li...] On Behalf Of Nate
Jennings
Sent: March 28, 2007 16:46
To: ope...@li...
Subject: [Openev-discuss] Open EV Add-ons


Hi,
I am new to the list and have a background in remote sensing, digital
image processing, and some programming.  I teach a remote sensing course
in Sacramento, CA and have been looking for a supplemental open source
software that is easy to install and fairly straight forward to use.  I
am currently using Imagine for my in-class work, but the students would
like an alternative that they can use at home to get more experience
working with satellite, airborne, RADAR, LIDAR, and multispectral data.
I looked into GRASS and have known about it for years.  I even have it
loaded on my system, but going through the install (primarily on
windows) is too much for my students and getting a "free" functioning
software like I can get for ESRI is not going to happen.  When I was in
grad school at U of Wisconsin, I took a remote sensing algorithms class
where the students developed their own software with quite a bit of
functionality...the problem is it was developed for OS2 and in C++.
Since then I have been teaching GIS programming and am in the middle of
an intermediate programming class using Python.  I thought as part of my
endeavor in learning would be to create a python shell, add some basic
navigation buttons (pan/zoom in/out, zoom to extent, zoom to full image)
and then build into the shell image processing functions such as:  image
classification (IsoData, Max Like, MDM), subsetting, image enhancement
(stretches, principle components, ratios), RADAR (slant to ground range,
texture), etc.  GRASS was my original choice, but I have not been able
to come up with a method that is pretty streamlined and easy to use for
students who don't know little or nothing about remote sensing and
little to average GIS.  Installing Cywin, and GRASS, and working through
setting up the coordinate sytem, etc is very challenging and not
inuitive to the novice installer.

I started to develop my own shell with wxPython and was able to learn
about some basic concepts of buttons, menu items, load an image, but
still have a long way to go, then in doing research I came across OpenEV
and FW Tools.  FW Tools actualy has some of the above functionality
already present and hooks into OpenEV...(if this is correct to say).
So, it seems to me that I could translate the algorithms I have from C++
to python? or GTK+? to then add this functionality to FW Tools.

I would like to collaborate with someone here or with FWTools to add
this functionality.  I need some guidance on getting this started.  It
looks like some direction is given with some of the tutorials, but I
need a little more guidance.  I can also provide the C++ code for some
of the algorithms stated above.  I do want to be able to program some of
this on my own, so if anyone can provide some feedback, tutorials, other
people to talk to, other websites and/or projects, I would appreciate
it.  Do I need to consult GTK, GDAL, etc?  Sources and starting places
for these?  Also, if there is a better/easier way to install and get
going with GRASS or any other open source program, I am open to that
too.

My website is below.  Works best in FireFox.  Show a little of what I do
and my background and resume.  I will make the same post to FWTools.

Thank you in advance for any assistance.

Nate

--=20
http://www.jenningsplanet.com=20