Data & Access

The Data Access Portal in general include two major entry points: the EnMAP Instrument Planning Portal and the EOWEB® GeoPortal.

On the EnMAP Instrument Planning Portal users can register, submit proposals, and plan and request future orders. The EOWEB® GeoPortal contains the full EnMAP Data archive. Users can access EnMAP data using two different options:

• Users can request acquisitions through the EnMAP Instrument Planning Portal. The portal includes the Proposal Portal for proposal submission by all scientific users responding to an Announcement of Opportunity (AO) and the Observation Request Portal providing planning support of observation requests and submission of future orders.
• Users can search and order data in different processing levels from the German Satellite Data Archive (D-SDA) through the EOWEB® GeoPortal.

More information on using the EnMAP Data Access Portal is available in the user manual and in short video screencasts linked in the menu belowon the left.

Product Levels

The following EnMAP data products are available to the user community: Product Level 1B, 1C, and 2A. Please, note that the raw data and the subsequent Level 0 products are not available to the user community. This section provides a short definition of these products, a more detailed description can be found in Guanter et al. (2015) and Kaufmann et al. (2016).

Level 1B Processor (ENMAP.HSI.L1B)

The systematic/radiometric correction processor converts raw image pixels values to at-sensor radiance physical values

The Level 1B product represents top-of-atmosphere radiance. This product is radiometrically corrected, spectrally- and geometrically characterized, quality controlled, and annotated with preliminary pixel classification (usability mask). The auxiliary information (e.g., position and pointing values, interior orientation parameters) necessary for further processing is attached, but not applied. The Level 1B processor corrects the hyperspectral image for known effects, e.g., radiometric nonuniformities, and converts the system corrected data to physical at-sensor radiance values based on the up to date radiometric calibration values.

Level 1C Processor (ENMAP.HSI.L1C)

The geometric correction processor orthorectifies images using different methods and performs the resampling of the image (with and without automatically extracted GCPs)

The Level 1C product represents geocoded top-of-atmosphere radiance. This product is derived from the Level 1B product, which is subsequently geometrically corrected (orthorectified) and re-sampled to a specified grid. Auxiliary data for further processing are attached, but not applied. The Level 1C processor creates orthoimages by direct geo-referencing, utilizing an adequate digital elevation model. The extraction of ground-control-points from existing reference images using image matching techniques serve to improve the line-of-sight vector and, therefore, to increase the geometric accuracy of the orthoimages. The Level 1C processor orthorectifies image tiles from the VNIR and SWIR instrument independently.

Level 2A Processor (ENMAP.HSI.L2A)

The atmospheric correction processor produces reflectance values for land and water areas and generates several quality masks.

Finally, the Level 2A processor will convert the Level 1C products to surface reflectances separately for land and water applications. This split procedure is quite unique in data processing and should give the user the possibility to select the best result according to the area of interest (land or water or combined). The atmospheric correction involves generation of sun glint maps for water surfaces by identification of specular reflections, detection (and correction) of haze and cirrus, estimation of aerosol optical thickness and columnar water vapor and retrieval of surface reflectance after adjacency correction. Auxiliary data for further processing are attached, but not applied. Most applications are envisioned to use the Level 2A product for further analysis.

Output Processor (ENMAP.HSI.Output)

The output processor generates the final image product and masks as well as the metadata and history files.

Processing and delivery of Level 1B, Level 1C and Level 2A products are to be conducted within a maximum of 6 days after completion of the corresponding downlink. The user can choose the image format (BSQ, BIL BIP, JPEG2000 or GeoTIFF). The metadata is always in Extensible Markup Language (XML) format.