GCP Viewer Wiki

Provider Manual

Overview

This manual aims to introduce the data upload and storage process in the GCP Viewer. As the automatic integration functions are still under development, the content of this page is subject to change in the future. In the meantime, if you are interested in providing data for the GCP Viewer, please do not hesitate to contact us at gcpviewer@visioterra.fr.

Which type of data is stored in the GCP Viewer?

The GCP Viewer proposes several types of datasets usable for Cal/Val activities. This includes the following classes of data:

  • Ground Control Points (GCPs, e.g., surveyed points)
  • Ground Control Rasters (GCRs, e.g., optical, radar, thermal acquisitions, Digital Elevation Models)
  • Ground Control Vectors (GCV, e.g., corner of building, intersection...)
  • Ground Control Point Clouds (GCPCs, e.g., airborne LiDAR acquisitions)
  • Ground Control Meshes (GCM, e.g., triangulation from point cloud)

These classes of data are hereafter referred as the generic term "Ground Control Elements", abbreviated as "GCE".

How is data stored in the GCP Viewer?

GCE identification

The GCP Viewer uniquely identifies a Ground Control Element (GCE) using a set of four identifiers, which are the following:

  • Provider ID - Identifier of the data provider (e.g., Telespazio)
  • Collection ID - Identifier of the collection (e.g., Grosseto)
  • Group ID - Identifier of the group (e.g., Grosseto_08). A group contains one or more GCEs over the same region of interest (e.g., a surveyed point, an optical raster an a polygon covering/depicting the same building corner).
  • GCE ID - Identifier of the GCE (e.g., GC Point).

Data storage

Under the hood, the GCP Viewer directly uses these identifiers to store and organise data, using the following url pattern: https://visioterra.org/GCPViewer/repository/Telespazio/Grosseto/Grosseto_08/GC%20Point/<RESOURCE>

In this url, the <RESOURCE> may correspond to one of the following files:

  • data.<EXTENSION> - The data of the GCE (e.g., a GeoJSON or KML for a point)
  • description.pdf - The documentation of the GCE
  • metadata.json - The metadata of the GCE
  • footprint.json - The footprint of the GCE
  • quicklook.png - A quicklook (light preview) of the GCE

How to contribute?

While the data upload functions are not available yet, we would still be happy to consider integrating your data. Please contact us at gcpviewer@visioterra.fr if you are interested, any contribution to the GCP Viewer is greatly appreciated.