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Author Topic: LAS intensity?  (Read 3149 times)

StevenF

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LAS intensity?
« on: June 17, 2015, 03:16:01 AM »
What is the source of the Intensity value for points exported in LAS format?

My images are four channels (R-G-B-NIR) and I performed dense cloud generation with the master channel set to default. I'd like to calculate point intensity metrics over an area (min, max, mean, etc of intensity) so I need to know where this intensity info is coming from. It would be really nice if there were a setting to choose a particular channel for the intensity value since I'd like to use the NIR channel.

Alexey Pasumansky

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Re: LAS intensity?
« Reply #1 on: June 18, 2015, 12:16:35 PM »
Hello Steven,

When dense cloud is generated based on the single channel, the intensity stored in LAS will be related to this channel only.
Since the single channel is represented as grayscale image, the intensity will correspond to the value for this channel.
Best regards,
Alexey Pasumansky,
Agisoft LLC

StevenF

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Re: LAS intensity?
« Reply #2 on: June 18, 2015, 04:32:27 PM »
Thanks Alexey. When the master channel is set to default the intensity value isn't consistently the same as any of the LAS R-G-B values for the point and it doesn't seem to be a combination of them. So I'm still a bit confused what it means when set to default, but I can reprocess with a particular channel to get what I want.