RETROCHANGE DATA LICENSE - UC4 / RETROCANOPY
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Dataset:
RETROCHANGE UC4 RETROCANOPY Havesova 1975 Image and Gap Correction

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:
- Havesova.tif
- add_gaps.shp
- add_gaps.shx
- add_gaps.dbf
- add_gaps.prj
- add_gaps.cpg
- add_gaps.qix

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 historical image is 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 hand-drawn gap polygon is a site-specific interpretation correction
for the Havešová worked example; it is not a field-validated gap inventory.

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 UC4 RETROCANOPY Havesova 1975 Image and Gap Correction.
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.

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
