Spectral imaging as a general concept combines characteristics of imaging and spectroscopy technologies. Optical spectral imaging particularly makes use of visible, near infrared and short-wave infrared spectral range, has been demonstrated to be a very powerful tool in identifying, classifying, and mapping specific targets across whole scenery image in various application scenarios.
Spectral Imaging is especially useful in the agricultural domain, where crop/vegetation in different conditions has unique spectral characteristics. With more robust and rugged imaging product integrated with various platforms, agri-tech has been undertaking revolutionary improvements for remote sensed inspection. Multispectral imaging, hyperspectral imaging, and SIF (solar-induced fluorescence) imaging can be broadly derived depending on spectral bands and resolution needed.
Eliot Dixon, Head of Engineering at Agri-EPI Centre said:
“We have established a strong sensing team within the company, able to deploy a range of spectral imagers into agriculture including some exciting unique capabilities. With our contextual farm data, storage facilities and analysis tools this is a key data service for developers which is available to all.”
Multispectral Imaging
The advantage of multi-spectral imaging is that it extends human sight sensitivity beyond visible spectrum. Some wavelengths that are widely recognized for particular applications, such as normalized difference vegetative index (NDVI), can be deployed into multi-spectral imaging. Nonetheless, it has been proven to be very useful in many other fields, greatly empowering advancement of agriculture. And the adoption of UAV has made it possible to make large-scale mapping and thus better agricultural management.
Agri-EPI Centre has invested MicaSense Altum sensor covering RGB, NIR, Red Edge and LWIR, which can be operated easily on VTOL UAV platform.
With this multi-spectral imaging system, several important vegetation indexes such as red edge, NDVI, can be quickly collected and mapped across survey fields.
Hyperspectral Imaging
Hyperspectral imaging captures images at hundreds of wavelengths, creating a detailed spectral signature of objects and materials. Compared to multispectral imagery, hyperspectral imagery measures energy in narrower and more numerous bands, thus giving much more information on target. Hyperspectral image data is a datacube, where each pixel holds full spectrum across the range. Since spectra are as unique as ‘fingerprint’ to target, hyperspectral imagery can unveil features that multispectral may miss out.
Agri-EPI Centre has invested in a range of hyperspectral imaging systems. Read below for more:
