Hyperspectral Instruments

Hyperspectral Instruments

Dimap’s Hyperspectral suite uniquely covers the wavelength range from 400nm to 12000nm, is highly sensitive and extremely stable

Dimap combines leading edge sensors from multiple manufacturers, integrated into a single platform giving greater flexibility and highest performance compared to sensors from a single source.

Dimaps main advantages:

  • The visible near-infrared, VNIR (400 to 1000nm), is a pushbroom scanner of the highest resolution (1600 pixels) cross track assuring a high spatial resolution With 160 bands for detailed spectral signatures. This enables higher flying altitudes maintaining the highest spatial resolution while minimizing acquisition costs.

The VNIR spectrometer is mainly used for vegetation and aquatic system analysis, but can also provide cost effective mapping of iron ore deposits.

  • The short wave infrared, SWIR (1000 to 2500nm), is also a pushbroom scanner providing diverse operational capabilities being a compact sensor with high spectral stability. This provides cost effective service with no compromise on the quality even under difficult conditions like high altitude applications or helicopter installations.

This sensor is mainly used for mineral mapping of most mineral deposit types but can also support target recognition.

  • The Thermal Longwave Infrared Hyperspectral sensor, TIR (7700 to 12000nm), is a Fourier transformation spectrometer combined with special stabilization for up to

400 bands maintaining a superior signal to noise ratio, which is unavailable in other Hyperspectral sensors covering these wavelengths.

This TIR allows excellent discrimination of minerals but also the detection of wide variety of gases like SO2, CO2, NOx, Ozone and pipeline gases.

  • The field spectrometer, ASD FieldSpec, is used for standard ground truthing which allows the direct implementation of the selected spectra from 350 to 2500nm into the Hyperspectral processing workflow.
  • The Hyperspectral Laboratory employs a calibrated lighting systems modeling a Planck curve between 400 and 2500nm to ensure an absolute clean spectral sample using the VNIR and SWIR Hyperspectral sensors.

Parameter VNIR SWIR TIR Longwave Ground Spectrometer
Type of Instrument Pushbroom Pushbroom Fourier TransformationSpectrometer Slit-Sensor
Flight altitude (mabove ground level) 600 to 5000m 600 to 5000m 500 to 5000m
CCD Size 1600 by 1200 320 by 256 320 by 256
Field of view 32 or 60 degrees 24 or 48 degrees 6 or 24 degrees Fibre cable 5 degree
Pixel size of data 0.3m to 2m 0.5m to 5m 0.2m to 6m
Make and model of sensor Neo Hyspex 1600 Neo Hyspex 320e Telops Hypercam ASD Fieldspec
Spectral range 400 to 1000nm 1000 to 2500nm 7700 to 11800nm 350 to 2500nm
Spectral resolution intervals in nm 2.5 6.5 FT-Spectrometer, variables from flyingparameters 1.4nm@350-1050 nm2nm@1000-2500 nm
Typical bandnumber 160 254 Between 60 and 400 1250
All rights reserved with Dimap, for technical details contact: Holger.Eichstaedt@dimap-spectral.com