Data & Access

The Data Access Portal includes two major entry points: the EnMAP Instrument Planning Portal and the EOWEB® GeoPortal. Additionally, users can directly access [Analysis Ready Data (ARD)] via the EOC Geoservice and EoLAB

On the EnMAP Instrument Planning Portal registered users can submit proposals, plan, and request future orders. More information on using the EnMAP Data Access Portal is available in the user manual and in short video screencasts linked in the menu on the left.

On the DLR multi-mission web portal EOWEB the complete EnMAP Mission archive is available, where users can select the product level (L1B, L1C, L2A) for on-demand processing with the most up-to-date processors version. Additionally, users can choose more processing options (e.g., atmospheric correction over water) to obtain more precise results.

The EOC Geoservice provides immediate access for product downloads and facilitates the retrieval of large volumes of EnMAP data.

The EO-Lab platform offers a data explorer and direct access to L2A data, as well as a processing environment to analyze the data for research and development purposes. For further information please contact EO-Lab user support or consult EO-Lab help.

All recorded data is processed to L2A ARD format using EnMAP’s Ground Segment processors and default parameters. The default processing parameters of the L2A ARD are the following:

• Product_Format = GeoTIFF+Metadata
• Map Projection = UTM_Zone_of_Scene_Center
• Image Resampling = Bilinear_Interpolation
• Correction Type = Land_Mode
• Cirrus Haze Removal = No
• Band Interpolation = No
• Terrain Correction = Automatic
• Water Reflectance Product = Normalized_Rrs
• Water Type = Turbid
• Season = Automatic
• Ozone column = Automatic

Please be aware of the following:

• the versions of the L2A ARD products may differ depending on their generation time. The processor changelog (https://www.enmap.org/data/doc/EnMAP_processor_changelog.pdf) provides an overview of the software changes
• The L2A ARD archive is still being completed and will continue to grow, including more EnMAP scenes in the coming months.

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.