US 2020/0025613 A1 · HYPERSPECTRAL SENSING SYSTEM AND PROCESSING METHODS FOR HYPERSPECTRAL DATA

Abstract

A hyperspectral sensing device may include an optical collector configured to collect light and to transfer the collected light to a sensor having spectral resolution sufficient for sensing hyperspectral data. In some examples, the sensor comprises a compact spectrometer. The device further comprises a power supply, an electronics module, and an input/output hub enabling the device to transmit acquired data (e.g., to a remote server). In some examples, a plurality of hyperspectral sensing devices are deployed as a network to acquire data over a relatively large area. Methods are disclosed for performing dark-current calibration and/or radiometric calibration on data obtained by the hyperspectral sensing device, and/or another suitable device. Data obtained by the device may be represented in a functional basis space, enabling computations that utilize all of the hyperspectral data without loss of information.

Claims20

Dependent claims

A computer-implemented method for predicting ground-truth data corresponding to remotely measured data, the method comprising:

acquiring a ground-truth spectrum corresponding to light measured at a first location at a first time;
acquiring first remote spectral data corresponding to the first location at the first time;
determining first weighting coefficients of a ground-truth function representing the ground-truth spectrum in a functional basis space;
determining second weighting coefficients of a first remote function representing the first remote spectral data in the functional basis space;
determining a correlating relationship predicting the first weighting coefficients based on the second weighting coefficients;
acquiring second remote spectral data and determining third weighting coefficients of a second remote function representing the second remote spectral data in the functional basis space;
and
using the correlating relationship to predict, based on the third weighting coefficients, projected ground-truth weighting coefficients corresponding to a projected ground-truth function representing a projected ground-truth spectrum in the functional basis space.

5 more elements

A method of measuring a radiometrically calibrated spectrum using a spectral sensor deployed at an outdoor location without relocating the spectral sensor, the method comprising:

measuring a spectrum of light using a spectral sensor deployed at an outdoor location;
normalizing the measured spectrum using a selected normalizing factor;
computing a simulated spectrum based on a simulation of at least a portion of the atmosphere at the outdoors location, the simulation including one or more adjustable parameters;
adjusting at least one of the adjustable parameters to produce an adjusted simulated spectrum matching the measured spectrum according to one or more predefined criteria;
determining a mathematical transformation capable of transforming the measured spectrum, such that at least a portion of the transformed measured spectrum approximates at least a portion of the adjusted simulated spectrum;
and
performing the mathematical transformation on the measured spectrum to produce a radiometrically calibrated spectrum.

4 more elements

Dependencies are inferred from the claim text.

Hyperspectral sensing system and processing methods for hyperspectral data

Life of this patent

Hyperspectral sensing system and processing methods for hyperspectral data

Life of this patent

Abstract

Claims20