Interpreting the Abundance Map

OTB Usage
1

Context

I’m new here. Trying to learn a little bit about the unmixed image

Configuration setup

My system: Windows10
Version of the OTB: OTB-7.3.0-Win64
QGIS version: 3.16.3-Hannover

Description of my issue

I need to process some 4 band imagery using OTB Hyperspectral Unmixing. I’ve got to come up with a grayscale abundance image, expressed as a percentage with values from 1-100. I just can’t seem to make sense of the unmixed output and how it relates to the input/endmembers.

A little about my application

I work in flight simulation. To configure a sensor image, I’ve got to have a 5-band tif.
Band 1 is used to express my primary material as a grayscale value 0-255.
Band 2 is used to express my secondary material as a grayscale value 0-255.
Band 3 is used to express my tertiary material as a grayscale value 0-255.
Band 4 is the abundance of the primary material expressed as a percentage 0-100.
Band 5 is the abundance of the secondary material expressed as a percentage 0-100.
Tertiary mixture is derived from 4 and 5.

Can someone help me or point me to another resource?*

Thanks!

2

Dear @apaul,

Thank you for using the OTB :slight_smile:

The abundance map (AM) is a multispectral image. This image has as the same number of band than the input Endmember image (EI). It also has the same number of pixel than the input image (II).

Each pixel of the AM corresponds to a pixel of the II, and represents the proportion of each endmember in this pixel. The band M of the AM correspond to the Mth endmember.

I hope this helps.
Sincerely.
Julien :slight_smile: