comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » IDL ROI Objects

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

Re: IDL ROI Objects [message #90130 is a reply to message #90126]

Thu, 29 January 2015 02:05

David B
Messages: 18
Registered: January 2015

Junior Member

On Wednesday, January 28, 2015 at 7:38:57 PM UTC, David Fanning wrote:
> Fabien writes:
>
>> But for the climate data world, where a lon lat pixel coordinate
>> extracted from NetCDF is located at the center of a grid point (not
>> called "pixel" anymore), the behavior of IDLanROI is quite nice.
>
> Yes, but, of course, when you go to put the result on a map, everything
> gets confused again! When Matt Savoie and I worked together at NSIDC we
> would start out in the morning in complete disagreement and end up in
> the afternoon in complete disagreement, but on the opposite side of the
> argument from where we started! It's confusing. ;-)
>
> 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.")

So what may be required is IDL to ask a question on opening:

IDl>Are you looking at the floor or the sky?

This is a most confusing issue and indeed non-intuitive. I think my solution may be satisfactory for the time being. I do apologise for causing such a ruckus. I think I have gained valuable insights into how IDL 'thinks' things should work.

So perhaps a more formal tutorial could be done by the IDL software engineers, as it would clearly be inconvenient for the people looking at the floor or the sky if the ROI objects went one way or the other based on the discussion here. I think I will just have to put up with the pixel shifted FITS convention.

David

Report message to a moderator

[Message index]

		IDL ROI Objects By: David B on Tue, 27 January 2015 09:28
		Re: IDL ROI Objects By: David Fanning on Tue, 27 January 2015 10:53
		Re: IDL ROI Objects By: David Fanning on Tue, 27 January 2015 11:00
		Re: IDL ROI Objects By: Fabzi on Tue, 27 January 2015 15:10
		Re: IDL ROI Objects By: David B on Wed, 28 January 2015 02:00
		Re: IDL ROI Objects By: David B on Wed, 28 January 2015 02:06
		Re: IDL ROI Objects By: David Fanning on Wed, 28 January 2015 06:12
		Re: IDL ROI Objects By: David Fanning on Wed, 28 January 2015 06:19
		Re: IDL ROI Objects By: David Fanning on Wed, 28 January 2015 09:17
		Re: IDL ROI Objects By: Fabzi on Wed, 28 January 2015 09:49
		Re: IDL ROI Objects By: David Fanning on Wed, 28 January 2015 10:17
		Re: IDL ROI Objects By: Fabzi on Wed, 28 January 2015 10:30
		Re: IDL ROI Objects By: David Fanning on Wed, 28 January 2015 10:42
		Re: IDL ROI Objects By: Fabzi on Wed, 28 January 2015 10:56
		Re: IDL ROI Objects By: David Fanning on Wed, 28 January 2015 11:20
		Re: IDL ROI Objects By: Fabzi on Wed, 28 January 2015 11:24
		Re: IDL ROI Objects By: David Fanning on Wed, 28 January 2015 11:38
		Re: IDL ROI Objects By: David B on Thu, 29 January 2015 02:05
		Re: IDL ROI Objects By: Fabzi on Thu, 29 January 2015 02:50

Previous Topic:	Krig2d from point to image
Next Topic:	Re: Why did IDL just start crashing

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Thu Oct 09 07:17:42 PDT 2025

Total time taken to generate the page: 0.40049 seconds