Frequently Asked Question

eomQS - QGIS plugin for data access
Last Updated 4 months ago

1. Introduction

EomQS is a QGIS plugin developed by EODC for access to raw data satellite imagery using a remote desktop connection. Refer to the guide for more information on remote desktop connections: How to access a Virtual Machine with Remote Desktop?

This tutorial will show how to load background data & how to load L1C data provided by EODC.

2. eomQS usage

eomQS is a QGIS Plugin that uses the EODC metadatabase for performing searches and finding L1C data.
After establishing a remote connection, you may find QGIS on the desktop.

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For easier orientation the OpenLayers plugin can be used to load a background map. This option is found under the Web menu. Google Maps, OpenStreetMap and other map sources are available to be loaded.

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Standard QGIS functions can be used to navigate the map (Zoom in, Zoom Out, Pan etc.). For this demo focus will be on Vienna.

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EomQS will open in a new window by clicking on the button highlighted below

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The search Tab shows the main parameters for searching the metadatabase.

  • Keywords - can be used to search between different keywords, such as satellites (Sentinel-1, Sentinel-1A, Sentinel-2 ...), Sensor modes (IW, EW ...), Product types (GRD, SLC). A list of possible keywords can be found by clicking on the "?" button. Many keywords can be specified, separated by a comma (Sentinel-1, GRD, HR).
  • Date, From , To - To enable setting dates, click the Specify Date checkbox. With this selection it is possible to request data only from a certain period
  • A bounding box can be set in the Xmax, Ymax, Xmin, Ymin fields. The values can be set manually, globally or through the given map extent.
    • Xmin - Xmax: East-West or Longitude
    • Ymin - Ymax: South-North or Latitude

After all parameters are input in the query, click the Search button to perform the search. The results are shown in the Results tab

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In the section Analyse Results, the results of the query will appear.

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A single click on a dataset will show the bounding box of the dataset overlaid over the main QGIS window. Double clicking a dataset will open a new dialog with metadata and a preview image.

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When a dataset is highlighted it is possible to load the selected image into QGIS. In the dropdown menu a list of all bands is shown. When a band is selected it is possible to load it by clicking the Load Image button. In this case the True Color Image is loaded.

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