Open Data and Sensing Resource

OpenKIWAS-Unique-Identifier:
opendata-EO-0001

Source organisation:
CERTH

Name:
Sentinel 1

Type:
Satellite Radar Data (Synthetic Aperture Radar - SAR)

Area:
Global coverage, including land and ocean

Quality:
High-resolution, all-weather, day-and-night imaging

Availability:
Free and open access via Copernicus Dataspace Ecosystem

Update frequency:
6-12 days (depending on location and mission phase) - currently 12 days (1 satellite)

Legal restrictions:
Open data policy under the Copernicus program

Description:
Sentinel-1 consists of two satellites (Sentinel-1A & 1B, with 1C planned) providing C-band SAR imagery for applications like land monitoring, maritime surveillance, and disaster response.

Variable(s):
Sentinel-1 provides: - Backscatter Coefficient (σ⁰): Reflectivity of surfaces (land, water, ice). - Coherence: Surface change detection (InSAR). - Phase Information: Ground displacement and elevation (InSAR). - Polarization (VV, VH, HH, HV): Surface type differentiation. - Doppler Information: Ocean currents and moving object detection. - Georeferenced Radar Images: SAR images in various acquisition modes.

Spatial coverage:

Spatial resolution:
Varies by mode: 5m (Spotlight), 10m (Interferometric Wide Swath), 25m+ (Stripmap, Extra-Wide Swath)

Temporal coverage:
2014–Present (Sentinel-1A launched in 2014)

Temporal resolution:
6-12 days (depending on revisit time and area)

Resource:
Copernicus Data Space Ecosystem , https://dataspace.copernicus.eu/

API Protocol:
The Copernicus Data Space Ecosystem catalogue is a web service that can be queried through 4 REST protocols - OData - STAC - OpenSearch - Sentinel Hub Catalog API

Limitations:
Large data volumes requiring significant storage and processing; InSAR analysis requires preprocessing; Noise in certain conditions