RETROCHANGE DATA LICENSE - UC3 / RETROFRAG
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Dataset:
RETROCHANGE UC3 RETROFRAG Forest Fragmentation Example Maps

License:
Creative Commons Attribution 4.0 International (CC BY 4.0)
https://creativecommons.org/licenses/by/4.0/


LICENSE SCOPE
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This notice accompanies the following data files:
- Brzegi_1975.tif
- Havesova3x3_1975.tif
- Ruske_1975.tif
- Ruske_2017.tif

and the associated dataset documentation in this data directory.

The RETROCHANGE-derived data and associated materials are made available
under CC BY 4.0 to the extent of the rights held by the Technical
University in Zvolen. This notice concerns the dataset; it does not
assign a license to the notebooks or their software dependencies.

Data provider: Technical University in Zvolen, Slovakia
Project: RETROCHANGE, 2026


SOURCE DATA AND THIRD-PARTY RIGHTS
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The 1975 forest maps were derived from declassified KH-9 (HEXAGON)
satellite imagery. Source imagery is credited to the U.S. Geological
Survey (USGS), Earth Resources Observation and Science (EROS) Center.

The Ruské map labeled 2017 was derived from the following source:
Ortofotomozaika 2017-2019 © GKÚ Bratislava, NLC.
The source product covers 2017-2019; an exact acquisition date for the
Ruské subset is not supplied. A source-specific license notice is not
included in this package. This notice grants rights only to the extent
held by the Technical University in Zvolen; it does not designate the
source orthophoto mosaic as public domain.

The original U.S. Government KH-9 imagery is public-domain data under
U.S. copyright law, unless otherwise specified by the source provider.
CC BY 4.0 applies only to rights held by the Technical University in
Zvolen in the derived dataset. It does not impose additional copyright
restrictions on the original public-domain USGS imagery.


ATTRIBUTION
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When sharing or adapting material covered by CC BY 4.0, provide
appropriate credit, a reference to the license, and an indication of
changes, in accordance with the license terms.

Recommended dataset citation:
Technical University in Zvolen (2026).
RETROCHANGE UC3 RETROFRAG Forest Fragmentation Example Maps.
RETROCHANGE project.
https://gis.tuzvo.sk/retrochange

Source acknowledgment:
Historical source imagery: Declassified KH-9 (HEXAGON) imagery courtesy
of the U.S. Geological Survey (USGS), EROS Center.
Modern source imagery: Ortofotomozaika 2017-2019 © GKÚ Bratislava, NLC.

Derived data preparation: Technical University in Zvolen,
RETROCHANGE project. Source acknowledgment is requested as good
scientific practice in addition to applicable attribution obligations.


DISCLAIMER
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The dataset is provided "as is", without warranty of positional,
radiometric, or thematic accuracy. It is not intended for cadastral,
legal, engineering, or survey-grade applications.

These statements describe technical limitations and do not impose
additional restrictions on uses permitted by CC BY 4.0.


PROJECT INFORMATION
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RETROCHANGE - Retrospective Analysis of Forest and Landscape
Changes from Historical Satellite Imagery
https://gis.tuzvo.sk/retrochange
