## 2 Mission Overview
### Mission Organization  
The EnMAP project is being executed by a series of institutions and governing bodies with specific tasks. These can be listed as follows ([[http://www.enmap.org/?q=organization](http://www.enmap.org/?q=organization)]([http://www.enmap.org/?q=organization](http://www.enmap.org/?q=organization))):  
* Scientific principal investigator at the GFZ (German acronym for German Research Center for Geosciences) in Potsdam, Germany: the principal investigator is responsible for the definition of the scientific objectives and requirements of the EnMAP Mission, the development of the EnMAP science plan, the advice to project management on trade-offs between technical and scientific issues during mission implementation and the conception and coordination of the validation of data products.
* The EnMAP Science Advisory Group (EnSAG) is headed by the scientific principal investigator and composed of international imaging spectroscopy experts. The EnSAG provides advice to the DLR Space Administration on the mission's scientific objectives, maintains the EnMAP Science Plan document, monitors the agreement between the scientific objectives and the EnMAP program execution, provides recommendations for complementary activities and raises awareness of EnMAP data in the scientific community.
* Project management is led by the DLR Space Administration in Bonn-Oberkassel, Germany. It is responsible for the overall project management, including the implementation and operation of the ground segment and for contracting the industrial consortium for the development of the space segment.  
\begin{table}
\begin{tabular}{l l} \hline \hline \multicolumn{2}{c}{**Mission Requirements**} \\ \hline
**Target revisit time** & 4 days with 30\({}^{\circ}\)across-track pointing \\
**Pointing accuracy (knowledge)** & 500 (100) m at sea level \\ \hline \hline \multicolumn{2}{c}{**Instrument Requirements**} \\ \hline
**Imaging principle** & Push-broom-prism \\
**Spectral range** & VNIR: 420–1000 nm/SWIR: 900–2450 nm \\
**Mean spectral sampling distance** & VNIR: 6.5 nm/SWIR: 10 nm \\
**Spectral oversampling** & 1.2 \\
**SNR at reference radiance** & \textgreater{}400:1 at 495 nm/\textgreater{}180:1 at 2200 nm \\
**Spectral calibration accuracy** & VNIR: 0.5 nm/SWIR: 1 nm \\
**Spectral stability** & 0.5 nm \\
**Radiometric calibration accuracy** & \textless{}5\% \\
**Radiometric stability** & \textless{}2.5\% \\
**Radiometric resolution** & 14 bit, dual gain in VNIR \\
**Sensitivity to polarization** & \textless{}5\% \\
**Spectral smile/keystone effect** & \textless{}20\% of a pixel \\
**Co-registration VNIR-SWIR** & \textless{}20\% of a pixel \\ \hline \hline \end{tabular}
\end{table}
Table 1: _Cont._* The EnMAP ground segment is led by the Earth Observation Center (EOC) at DLR in Oberpfaffenhofen, Germany. It comprises: (i) the mission operation system, controlling and commanding platform and instrument; (ii) the payload ground system, responsible for data reception, data processing and archiving and disseminating data products to users; and (iii) the processor and calibration/quality control system developing the processing system capable of generating calibrated data products at several processing levels, calibrating the sensor and performing data product quality control.
* The EnMAP space segment is led by OHB System AG. Space segment activities include building the satellite bus, designing and manufacturing the payload, the integration and testing of the entire satellite, the procurement of the flight opportunity, including launch support and preparation, and the launch itself.  
The different components of the EnMAP space and ground segments are briefly presented in the next sections.