comp.lang.idl-pvwave archive: archive » Homogenity Analysis of two raster datasets with different resolution

Home » Public Forums » archive » Homogenity Analysis of two raster datasets with different resolution - Need some advice

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Homogenity Analysis of two raster datasets with different resolution - Need some advice [message #86120]

Tue, 08 October 2013 19:30

Carl Bernatzki
Messages: 2
Registered: October 2013

Junior Member

Hello!

I am little desperate cause I have to do something difficult (for me) for my work. I know about the absolute basics in IDL but now I have to do something which I can't solve by my own and I hope I can find someone here who can give me some hints or send me some good sources/tutorial in the net cause I did not find many.

What I have to do:

I have to make a homogenity analysis of two raster datasets. For this I have to create a graphic overview, which compares the one raster data set (coarse resolution) with the other raster dataset (lower resolution). The results of this comparison have to be presented graphically.

I have problems finding some sources to this via the internet and my IDL book isn't helping me too. But I am sure there is something to find and I ask you to forward me to this pages/tutorials/whatever :-)

I dont want you to do my work cause I really want to learn it. So ist just ask for some good sources. Every help is appreciated! :-)

Greetings
Carl

Report message to a moderator

Re: Homogenity Analysis of two raster datasets with different resolution - Need some advice [message #86137 is a reply to message #86120]

Thu, 10 October 2013 06:49

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Carl Bernatzki writes:

> I am little desperate cause I have to do something difficult (for me) for my work. I know about the absolute basics in IDL but now I have to do something which I can't solve by my own and I hope I can find someone here who can give me some hints or send me some good sources/tutorial in the net cause I did not find many.
>
> What I have to do:
>
> I have to make a homogenity analysis of two raster datasets. For this I have to create a graphic overview, which compares the one raster data set (coarse resolution) with the other raster dataset (lower resolution). The results of this comparison have to be presented graphically.
>
> I have problems finding some sources to this via the internet and my IDL book isn't helping me too. But I am sure there is something to find and I ask you to forward me to this pages/tutorials/whatever :-)
>
> I dont want you to do my work cause I really want to learn it. So ist just ask for some good sources. Every help is appreciated! :-)

Make your two images the same size. Then subtract them. Then display the
subtracted image (after scaling it properly with BytScl and the
appropriate Min and Max keywords) with a two-color diverging color
table.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

Report message to a moderator

Re: Homogenity Analysis of two raster datasets with different resolution - Need some advice [message #86156 is a reply to message #86137]

Sat, 12 October 2013 15:21

Carl Bernatzki
Messages: 2
Registered: October 2013

Junior Member

Am Donnerstag, 10. Oktober 2013 15:49:49 UTC+2 schrieb David Fanning:
> Carl Bernatzki writes:
>
>
>
>> I am little desperate cause I have to do something difficult (for me) for my work. I know about the absolute basics in IDL but now I have to do something which I can't solve by my own and I hope I can find someone here who can give me some hints or send me some good sources/tutorial in the net cause I did not find many.
>
>>
>
>> What I have to do:
>
>>
>
>> I have to make a homogenity analysis of two raster datasets. For this I have to create a graphic overview, which compares the one raster data set (coarse resolution) with the other raster dataset (lower resolution). The results of this comparison have to be presented graphically.
>
>>
>
>> I have problems finding some sources to this via the internet and my IDL book isn't helping me too. But I am sure there is something to find and I ask you to forward me to this pages/tutorials/whatever :-)
>
>>
>
>> I dont want you to do my work cause I really want to learn it. So ist just ask for some good sources. Every help is appreciated! :-)
>
>
>
> Make your two images the same size. Then subtract them. Then display the
>
> subtracted image (after scaling it properly with BytScl and the
>
> appropriate Min and Max keywords) with a two-color diverging color
>
> table.
>
>
>
> Cheers,
>
>
>
> David
>
> --
>
> David Fanning, Ph.D.
>
> Fanning Software Consulting, Inc.
>
> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
>
> Sepore ma de ni thue. ("Perhaps thou speakest truth.")

Hello David,

thank you very much for your help!
Sounds easier than it really is for me. I hope I can do it. I will try it.
And I am still hoping I find some step by step tutorial for this in the web, in the case that I cant solve it by my own.

Greetings
Carl

Report message to a moderator

Re: Homogenity Analysis of two raster datasets with different resolution - Need some advice [message #86157 is a reply to message #86156]

Sat, 12 October 2013 17:55

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Carl Bernatzki writes:

> Sounds easier than it really is for me. I hope I can do it. I will try it.
> And I am still hoping I find some step by step tutorial for this in the web, in the case that I cant solve it by my own.

Well, I don't want to sound mean, but if you can't figure out how to
subtract two images in IDL, you really need something other than a
programming language to work with. I'm not sure what to suggest, except
maybe consider becoming a Jungian psychologist. I hear they make good
money. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

Report message to a moderator

Previous Topic:	IDL-python bridge (slither)
Next Topic:	IDL Astro Library Furloughed

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 13:51:40 PDT 2025

Total time taken to generate the page: 0.00512 seconds