Support

Overview of the Portal

The Luxembourg Space Agency (LSA) Data Center is the Luxembourg entry point to data products of Sentinel 1 and Sentinel 2 constellations.
The LSA Data Center allows the users to search, discover and download the data. To this purpose all the data are referenced and indexed in a real time updated geo-catalogue. The catalogue allows the users to query the archive on the basis of specific criteria such as product type, orbit, cloud coverage or polarisation mode and to select the needed products for the download.
User profiles are categorized into normal and premium users. Different levels of services are offered for normal and premium users. ** The LSA Data Center is intended to provide privileged access particularly to Luxembourg users.

https://lsa-datacenter.lu landing page provides easy access to all parts of LSA Data Center website.

  • "GEO-CATALOG" tab provides access to the LSA Data Center Catalogue Client
    Users can search, discover and browse the available preview images of Sentinel 1 and 2 products. Detailed information on how to use the Catalogue Client is provided in the following section.
  • "DASHBOARD" offers statistics of LSA Data Center archive in terms of available products and its evolution.
  • "Contact" allow the users to contact us.
  • "Support Page" You are here.
  • Further information about LSA Data Center can be found in "About us".
  • The "Account" tab of the menu provides the possibility to "Login" and view "Profile" if you are already registered user. It also offers the possibility to "Register" if you are a new user. More detailed information on login, view/edit profile and registration process are provided below.

Catalogue Client

Overview

The LSA Data Center Catalogue Client provides an enhanced solution to discover, view, and download available Earth Observation data (EO data). These are primarily Sentinel 1 and Sentinel 2 data sets.

Preview Images

The catalog client is served with preview images for both Sentinel 1 and Sentinel 2 missions. These images allow users to visualize the products before downloading.

  • The preview images for the Sentinel 2 are based on the True Color Image (TCI) provided with the original products. The preview images have a resolution of 10m for the products sensed within one year in the past from now. The 20m resolution is used for older products.
  • The preview images for the Sentinel 1 are generated on the basis of GRD products. These preview images are used for GRD, RAW and SLC product types. No preview images are provided for OCN products. The resolution for the preview images for Sentinel 1 are decided based on the geographic location. The preview images have a resolution of 40m for latitude between 60 degree North and 50 degree South. The resolution of 80m is used in the polar regions.

Please note that the resolution of the preview images are not the resolution of the Sentinel products. Indeed the LSA Data Center provides the orignial Sentinel products as produced by ESA.

Timeslider

The timeslider presents the distribution and number of (different) datasets in time (bar graphs). You can make a temporal selection on the timeslider:

  • panning (only in the bottom area): left click + drag or one finger drag or plus and minus icons in the middle
  • zooming: mouse wheel scroll or two finger pinch or right and left arrow icons
  • reloading timeslider: spinner icon in the middle
  • selecting a time interval for product searching and viewing (only in the upper area): left click + drag or one finger drag or click on histogram bucket
  • showing number of total available products in histogram bucket: hover over histogram bucket
  • showing start and end of current selection: click + hold on selection (or look at time filter)

Interactive tutorial

When the Catalogue Client is opened the first time a short interactive tutorial starts guiding you through the main features and elements of the Catalogue Client. You can start this short intro anytime clicking the button on the lower right of the window.

Visualisation and browse through existing image data can be performed in the map window. You can now zoom-in and pan the data. You can see a grid on the right part of the map. These are the approximate scene extents/foot prints without image content. When you start zooming-in the satellite images will appear in a reduced resolution natural colour presentation for viewing but will show full resolution when zooming in to full resolution. The map windows loads / selects data for the shown extent in the background. The time filter can changed using left click and drag in the upper area of the timeslider at the bottom of the map window or clicking on a histogram bucket.

Satellite scenes in the map window are used for a preview (pre-selection) for the download (see Download below). If you change the map extent or zoom in and out the pre-selection changes, too.

There are two panels: the left menu for selections, filters and background layers and on the right for presenting selcted data and downloads. Further deatils are provided in the filter and layer section below.

If you are hovering over the footprints (grey rectangles) or the single buckets in the timeslider the respective scene is highlighted in the map, timeslider and the selection menu at the right.

Product selection

If you use the button in the upper right part of the map window the menu/window with search results appears. Now the Catalogue Client is in the download modus, where you can search, select and download of check the satellite scenes.

LSA Data Center provides you with Viewing functionalities in the map window and Filter/Search functionality for download all in a single page.

Filter

There are two possibilities to query data in the Catalogue-Client. At the left there is the Filter window - see figure below:

1. You can apply a temporal query --> "Time Filter": Enter Start and End date of your search interval.

2. You can apply a spatial query: --> "Spatial Filter": using the "Rectangle" or "Polygon" drawing options under "Draw"

Additional Filters

Additional Filters can be applied on the available information stored with the data sets. Filters can be applied to sensor features such as Cloud Cover or Polarisation Mode.

Layers

If you click on "Layers" the "Overlay", "Layer" and "Base Layer" legend can be seen. The "Base Layer " is the background for the map window for orientation and the "Layer" presents the selected data sets and its products or products levels (e.g. Sentinel 2). You can select and change the order of the layers.

The order of of the layers has an influence on the order of layers in the timeslider.

Save search query

Clicking on the button next to the level in the search result tab, it is possible to save the search query. To download the XML file click with the right mouse button on the link and then "Save Link As...".

Dashboard

The Dashboard offers hourly updated statistics of the LSA Data Center such as the "Volume of Products" and "Number of Products" available in the archive. It also three distinct tabs with interactive features to display more detailed information on the archive.

Archive Composition

This tab shows the composition of the archive in terms of volume and number of products per mission. The statistics are displayed by hovering over the Pie Charts or over the Legends.

Statistics per product type are also displayed when clicked on the Pie Charts.

Data Availability

This tab gives information of the data available in the LSA Data Center grouped by sensing month. In particular the Bar Chart display the number of products sensed in a month and available for download in the archive. The Bar Charts are interactive and allow the user to select one or more product types by clicking the legend.

The LSA Data Center is the only Collaborative Ground Segment of Europe offerings full collection of Sentinel 2 data online.

Archive Evolution

This tab shows the evolution of the archive over time.

User Management

The LSA Data Center platform makes use of a User Management System (UMS), which is used for the authentication and authorisation of users. The UMS is used to manage users, user groups and user rights. Some changes of group membership and user rights can't be done automatically, but must be authorised and granted according to the LSA Data Center Governance (Rules for user groups and their access rights). The process of granting additional user rights to an user can last some time.

The main advantage of the UMS is that it provides a single-sign-on (SSO) procedure, which means that only a single login (after registration) is required by the user to access the configured and integrated LSA Data Center services.

Login

You can log in over the login block of the "Account" tab of the Portal which is shown in the figure below.

Once you have pressed the "Login" button you are redirected to the CAS login form. After entering your credentials and submitting the form you are logged in on the LSA Data Center platform...

Registration Form

If you don't have an account yet, you can create one by clicking on the "register" link next to the login block. This is necessary before you can login as a LSA Data Center user.

You will be redirected to a self-registration form which is shown in the figure below.

Please note once you click the "Register" button you accept the LSA Data Center Terms and Conditions and Privacy Statement.

After sending the completed form you will be redirected to the LSA Data Center Portal.

Profile Page

After the completetion of registration, an user account is created using the information provided in the registration form. The information provided in the registration form can be revisited by the user any time by accessing the "Profile" tab available under "Account" as shown in the figure below.

In the profile page shown below, the users are allowed to

  • edit and modify the information provided during the registration process
  • change password
  • set up 2 step authentication using google authenticator or freeOTP in the "Authenticator" tab
  • check the logged in sessions
  • available permissions and access for the respective user account
  • logs of the previous logins

Further questions

If you have any further technical question, please feel free to contact the LSA Data Center Helpdesk:





Sentinel 2

Sentinel-2 is an Earth observation mission developed by ESA as part of the Copernicus program to provide continuity of SPOT and LANDSAT-type image data, contribute to ongoing multispectral observations and benefit Copernicus services and applications such as land management, agriculture and forestry, disaster control, humanitarian relief operations, risk mapping and security concerns. The mission comprises a constellation of two identical polar-orbiting satellites (Sentinel-2A and Sentinel-2B) placed in the same orbit, phased at 180° to each other. Sentinel-2A was launched on 23 June 2015 and Sentinel-2B followed on 7 March 2017.

Both satellites carry an innovative wide swath high-resolution multispectral imager with 13 spectral bands that combines a high spatial resolution (up to 10 x 10 m) with novel spectral capabilities and high revisit times (5 days at the equator and 2.3 days at mid-latitudes with both satellites, respectively).

For more information please refer to ESA's mission description that can be found here: https://sentinel.esa.int/web/sentinel/missions


Data products:

The Sentinel-2 multispectral imager (MSI) undertakes systematic acquisition in a single observation mode. The Sentinel-2 data products available for users are listed in the following figure:

Sentinel-2 available products

Measurement data file format of Level-1C and Level-2A: JPEG2000

Level-1C: Top of atmosphere reflectances in fixed cartographic geometry (combined UTM projection and WGS84 ellipsoid). Level-1C images are a set of tiles of 100 km², each of which is approximately 600 MB in size. These products contain applied radiometric and geometric corrections (including orthorectification and spatial registration).

Level-2A: Bottom of atmosphere reflectances in cartographic geometry. The Level-2A operational processor generates, from algorithms of scene classification and atmospheric correction, Level-2A (BOA reflectance) products based on Level-1C products. In addition to the operational processor, Level-2A data products can be generated by the user by on the user side by using a processor running on ESA's Sentinel-2 Toolbox, such as ESA SNAP (http://step.esa.int/main/toolboxes/snap/). The Level-2A is available since March 2017 as pilot version (Level-2Ap) and since 26 March 2018 as operational version. In the geocatalog the two version are published in the same layer.



Legal notice on the use of Copernicus Sentinel Data and Service Information

https://sentinels.copernicus.eu/documents/247904/690755/Sentinel_Data_Legal_Notice


Further questions

If you have any further questions regarding the Sentinel products, please feel free to contact the thematic Helpdesk:





Sentinel 1

Sentinel-1 is an Earth observation mission developed by ESA as part of the Copernicus program to provide continuity of ESA's ERS-1, ERS-2 and ENVISAT as well as Canada's RADARSAT-1 and RADARSAT-2. It comprises a constellation of two polar-orbiting satellites, operating day and night performing C-band synthetic aperture radar imaging, enabling them to acquire imagery regardless of the weather.

Sentinel-1 will work in a pre-programmed operation mode to avoid conflicts and to produce a consistent long-term data archive built for applications based on long time series. It will be the primary source of data for information on the oceans and the Arctic. The mission's ability to provide observation in all weather, and in day or night time conditions, makes it ideal for maritime and Arctic monitoring. SENTINEL-1 dual polarimetric products will benefit users interested in agriculture, forestry and land cover classification. The enhanced interferometric capabilities will benefit users involved in activities like geohazard monitoring, mining, geology and city planning through subsidence risk assessment. SENTINEL security users will be able to monitor major shipping routes to detect illegal activities, gather prosecution evidence in case of illegal discharges, detect unexpected building in remote areas, monitor deforestation and support search and rescue activities.

The rapid data dissemination and short revisit cycles of SENTINEL-1 together with its interferometric capabilities will also benefit emergency response users, such as the United Nations International Charter on Space and Major Disasters, in emergency situations such as floods, earthquakes, volcanic eruptions and landslides.

For more information please refer to ESA's mission description that can be found here: https://sentinel.esa.int/web/sentinel/missions


Data products, acquisition modes and processing levels:

Sentinel-1 data products acquired in SM, IW and EW mode which are generated by the PDGS operationally are distributed at three levels of processing. The following figure shows the different acquisition modes, processing levels and data products of Sentinel-1:

Sentinel-2 available products

Measurement data file format and resolution:

Level Product Type File Format
Level-0 RAW Binary file (.dat format)
Level-1 SLC GeoTIFF
GRD GeoTIFF
Level-2 OCN NetCDF

Level-0: Sentinel-1 Level-0 SAR products contain the RAW SAR data from the unprocessed Instrument Source Packets (ISP). Raw data products are generated from the 4 Sentinel-1 image modes such as Stripmap Mode(SM), Interferometric Wide Swath Mode(IW), Extra Wide Swath mode(EW) and Wave Mode (WV). Raw data products are also generated from the SENTINEL-1 calibration modes such as RF Characterisation Mode (RFC), Elevation Notch Acquisition Mode (EN) and Azimuth Notch Acquisition Mode (AN). Only the standard products from the SM, IW, and EW modes will be distributed by the Payload Data Ground Segment PDGS.

Level-1: Sentinel-1 Level-1 products are the baseline products for the majority of users from which higher levels are derived. From data in each acquisition mode, the Instrument Processing Facility (IPF) generates focused Level-1 Single Look Complex (SLC) products and Level-1 Ground Range Detected (GRD) products. All Level-1 products are geo-referenced and time tagged with zero Doppler time at the centre of the swath. Geo-referencing is corrected for the azimuth bi-static bias by taking into account the pulse travel time delta between the centre of the swath and the range of each geo-referenced point.Level-1 products can be generated by the users using the processor running on ESA's Sentinel-1 Toolbox such as ESA SNAP (http://step.esa.int/main/toolboxes/snap/).

Level-2: Sentinel-1 Level-2 consists of geo-located geophysical products derived from Level-1. There is only one standard Level-2 product for wind, wave and currents applications - the Level-2 Ocean (OCN) product. The OCN product may contain Ocean Wind field (OWI), Ocean Swell spectra (OSW) and Surface Radial Velocity (RVL) geophysical components derived from the SAR data. OCN products are generated from all four Sentinel-1 imaging modes. From SM mode, the OCN product will contain all three components. From IW and EW modes, the OCN product will only contain OWI and RVL. From WV modes, the OCN product will only contain OSW and RVL. Level-2 products can be generated by the users using the processor running on ESA's Sentinel-1 Toolbox such as ESA SNAP (http://step.esa.int/main/toolboxes/snap/).



Legal notice on the use of Copernicus Sentinel Data and Service Information

https://sentinels.copernicus.eu/documents/247904/690755/Sentinel_Data_Legal_Notice


Further questions

If you have any further questions regarding the Sentinel products, please feel free to contact the thematic Helpdesk: