multispectral versus hyperspectral
Identification - Quantification -> Diagnosis

EnMAP - Requirements and Technical Outline

Multi- versus Hyperspectral / Potentials

Every material is formed by chemical bonds, and as such can be characterised by spectral absorption features in the electromagnetic spectrum. EnMAP has the capability to detect individual absorption features in the spectra of many materials, solids, liquids, or gases. Actual detection depends on the instrument´s spectral coverage, spectral resolution, spectral sampling, signal-to-noise ratio, the abundance of the material and the strength of the materials absorption features in the wavelength region measured.


Identification – Quantification => Diagnosis
 

  • Each material on the Earth‘s surface has a unique spectral characteristic
  • Pigments, Minerals, Man Made Objects

Spectral Requirements

  Spectral sampling interval Spectral bandwidth (FWHM)

Number of bands
(total of ~244)

VNIR-range
     
420 nm - 1000nm 6.5 nm 8.1 ± 1.0 nm ~ 89
SWIR-range      
900 nm - 2450 nm 10 nm 12.5 ± 1.5 nm ~ 155

The Number of bands may vary due to overlap at 900-1000nm and non-linearities of prism design.

Sensor Parameters

Signal-to-noise ratio (SNR) at 30% reflectance;
30° sun zenith angle; visibility 21 km;
target 500 m a.s.l.
VNIR: > 450:1 (at 495 nm)
SWIR: > 150:1 (at 2200 nm)
Spectral calibration accuracy VNIR: 0.5 nm
SWIR: 1 nm
Spectral stability 0.5 nm
Radiometric calibration accuracy < 5 %
Quantification / Radiometric stability 14 bit / < 2.5 %
Spectral smile/keystone effect < 20 % des Detektorelements
Ground sampling distance (GSD) 30 m x 30 m (Nadir; NN)
Swath width 30 km
Swath length 1000 km/Orbit - 5000 km/Tag
Geometric co-registration <= 0.2 x GSD
Target revisit time 23 Tage (VZA ≤ 5°)
4 Tage (VZA ≤ 30°)
Data rate 860 Mbit/s
Downlink (X-band) / compression factor 300 Mbit/s / verlustfrei  2:1
Mass memory 512 Gbit
Weight 325 kg (890 kg inkl. Bus)

Contact

Profile photo of  Dr. Karl Segl

Dr. Karl Segl
Remote Sensing

Telegrafenberg
Building A 17, room 20.15
14473 Potsdam
tel. +49 331 288-1193