Journal: Plant methods

Article Title: THEMS: an automated thermal and hyperspectral proximal sensing system for canopy reflectance, radiance and temperature.

doi: 10.1186/s13007-020-00646-w

Figure Lengend Snippet: Fig. 1 a Internal view of the main sensor enclosure. (1) thermal camera, (2) VNIR hyperspectral line scanner with cooling fan, (3) shutter motor and mechanism, (4) 24 VDC to 12 VDC converter, and (5) shutter controller with temperature sensor. b External view of the main sensor enclosure on the pan tilt unit, tilted downward at the canopy. The white cover is the radiation shield with ventilation. c Contextual view of the THEMS sensor enclosure (number ‘1’ insert). Other inserted numbers are: 2) the command PC ensclosure, and 3) the all sky camera and irradiance sensor location

Article Snippet: Two other main system sensor components are the: (i) a VNIR spectrometer (model USB 2000+, Ocean Insight Inc.) attached to a cosine diffuser to measure down-welling hemispherical irradiance (W m−2 μm−1), and (ii) a hemispherical camera (model Q25, Mobotix, Germany) to capture an image of the sky conditions.

Techniques:

Journal: Plant methods

Article Title: THEMS: an automated thermal and hyperspectral proximal sensing system for canopy reflectance, radiance and temperature.

doi: 10.1186/s13007-020-00646-w

Figure Lengend Snippet: Fig. 2 Schematic of main system components. Arrows represent the direction of data transfer. The ancillary flux and meteorological data transferred to the command PC include sky temperature, ambient air temperature, and relative humidity. The main sensor enclosure houses the FLIR thermal camera and the Headwall VNIR hyperspectral line scanner ‘HLS’ (Fig. 1a)

Article Snippet: Two other main system sensor components are the: (i) a VNIR spectrometer (model USB 2000+, Ocean Insight Inc.) attached to a cosine diffuser to measure down-welling hemispherical irradiance (W m−2 μm−1), and (ii) a hemispherical camera (model Q25, Mobotix, Germany) to capture an image of the sky conditions.

Techniques:

Journal: Plant methods

Article Title: THEMS: an automated thermal and hyperspectral proximal sensing system for canopy reflectance, radiance and temperature.

doi: 10.1186/s13007-020-00646-w

Figure Lengend Snippet: Fig. 4 An exemplar of outputs from a single temporal acquisition of the VNIR HLS and thermal camera at two elevation angles for a morning scan on Jan 1st, 2018 at 07:45 (UTC + 10). a, b depicts RGB true colour composites at the − 20° θ and − 32.5° θ central elevation scan angles; c, d depicts the corresponding thermal imagery corrected for thermal interferences with the temperature colour bar to the right hand side; e depicts the irradiance from the start of the − 20° θ and − 32.5° θ central elevation scans; f depicts the all sky image from the start of the − 20° θ scan. Sun position at time of acquisition: 98° azimuth, 31° elevation. Part of the mounting platform is visible in the right-hand-side of the scans. Note that this and subsequent panoramic images are not orthorectified

Article Snippet: Two other main system sensor components are the: (i) a VNIR spectrometer (model USB 2000+, Ocean Insight Inc.) attached to a cosine diffuser to measure down-welling hemispherical irradiance (W m−2 μm−1), and (ii) a hemispherical camera (model Q25, Mobotix, Germany) to capture an image of the sky conditions.

Techniques:

Journal: Plant Methods

Article Title: THEMS: an automated thermal and hyperspectral proximal sensing system for canopy reflectance, radiance and temperature

doi: 10.1186/s13007-020-00646-w

Figure Lengend Snippet: Schematic of main system components. Arrows represent the direction of data transfer. The ancillary flux and meteorological data transferred to the command PC include sky temperature, ambient air temperature, and relative humidity. The main sensor enclosure houses the FLIR thermal camera and the Headwall VNIR hyperspectral line scanner ‘HLS’ (Fig. a)

Article Snippet: Two other main system sensor components are the: (i) a VNIR spectrometer (model USB 2000+, Ocean Insight Inc.) attached to a cosine diffuser to measure down-welling hemispherical irradiance (W m −2 µm −1 ), and (ii) a hemispherical camera (model Q25, Mobotix, Germany) to capture an image of the sky conditions.

Techniques:

Journal: Plant Methods

Article Title: THEMS: an automated thermal and hyperspectral proximal sensing system for canopy reflectance, radiance and temperature

doi: 10.1186/s13007-020-00646-w

Figure Lengend Snippet: THEMS four main sensor specifications

Article Snippet: Two other main system sensor components are the: (i) a VNIR spectrometer (model USB 2000+, Ocean Insight Inc.) attached to a cosine diffuser to measure down-welling hemispherical irradiance (W m −2 µm −1 ), and (ii) a hemispherical camera (model Q25, Mobotix, Germany) to capture an image of the sky conditions.

Techniques: