comp.lang.idl-pvwave archive: archive » Re: optimization; which point falls into a polygon

Home » Public Forums » archive » Re: optimization; which point falls into a polygon

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

Re: optimization; which point falls into a polygon [message #68212 is a reply to message #68027]

Fri, 25 September 2009 02:13

Klemen
Messages: 80
Registered: July 2009

Member

> See the help on map_proj_forward and map_proj_inverse. They may be
> useful to convert between latitude/longitude and pixel values,

I process already projected data (Lambert conformal projection). I am
also trying to write a shape file at the same time, so I can check
each pixel to be sure.

I have tried the suggested solutions and I think the optimal for me is
ROI way. It took 27s to get the results on a layer with 200 by 200
pixels; geostatioary image has in this case 74 * 45 pixels.

I have tried also JD's match_2d to get the closest point and then I
wanted to proceed by approach suggested by hethomas, however, it took
me 45s just to compute the closest satellite centre point (without
checking if GIS point really fits into the polygon)...

But I would have gone for such a similar approach if I hadn't asked
you for an advice before. So thank you all.

Report message to a moderator

[Message index]

		Re: optimization; which point falls into a polygon By: penteado on Wed, 23 September 2009 08:56
		Re: optimization; which point falls into a polygon By: hethomas on Wed, 23 September 2009 08:08
		Re: optimization; which point falls into a polygon By: Klemen on Wed, 23 September 2009 05:11
		Re: optimization; which point falls into a polygon By: Jeremy Bailin on Wed, 23 September 2009 04:46
		Re: optimization; which point falls into a polygon By: Maarten[1] on Wed, 23 September 2009 04:38
		Re: optimization; which point falls into a polygon By: Klemen on Fri, 25 September 2009 02:13

Previous Topic:	Smoothing 3D array with periodic boundaries: what am I missing?
Next Topic:	Re: Point Spread Function Simulation

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 18:44:40 PDT 2025

Total time taken to generate the page: 0.00423 seconds