RETROCHANGE DATASET METADATA - UC1 / RETROCOVER
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Dataset title:
RETROCHANGE UC1 RETROCOVER Hrebienok 1975 KH-9 Image Subset

Use case:
UC1 / RETROCOVER - Historical Land-Cover Mapping

Study area:
Hrebienok, High Tatras, Tatra National Park (TANAP), Slovakia

Project:
RETROCHANGE - Retrospective Analysis of Forest and
Landscape Changes from Historical Satellite Imagery

Parent dataset:
RETROCHANGE High Tatras 1975 KH-9 Satellite Image Mosaic

Parent dataset version:
1.0, as stated in the supplied source documentation

Publication year: 2026
Documentation edition: November 2026
Subset version: No separate version is recorded in the data files.
Application version: 1.0 (from the accompanying application package).


DESCRIPTION AND COVERAGE
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A single-band georeferenced historical image subset supplied
for the UC1 / RETROCOVER land-cover mapping workflow. It supports
image segmentation, expert interpretation, polygon review,
and preparation of a documented 1975 land-cover baseline.

Distributed image:
uc1_1_3x3_hrebienok.tif

Companion world file:
uc1_1_3x3_hrebienok.tfw

Raster footprint:
3,000 x 3,000 m (9 km2; 900 ha)

This is the rectangular footprint of the distributed raster,
not a measured area of any land-cover class or mapped output.
It is a subset of the High Tatras mosaic, not the full mosaic
or the full 2,500 ha Hrebienok demonstration area described in
broader RETROCOVER project materials.


SOURCE DATA
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Satellite system: KH-9 HEXAGON
Mission number: 1210-2
Acquisition date: 1975-06-27
Acquisition year: 1975
Source collection: USGS Declassified Satellite Imagery - 3
                  (Declass 3)
Source provider: U.S. Geological Survey (USGS),
                 Earth Resources Observation and Science
                 (EROS) Center
Source collection DOI: https://doi.org/10.5066/F7WD3Z10

Mission and acquisition information is inherited from the
supplied parent-dataset metadata; it is not encoded in the
inspected GeoTIFF tags.


PROCESSING AND RASTER PROPERTIES
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Processing organization: Technical University in Zvolen, Slovakia
Processing project: RETROCHANGE
Processing year: 2026
Parent processing: Georeferencing, image mosaicking, raster
                   tiling, and GeoTIFF preparation
Distributed product: RETROCOVER Hrebienok rectangular image subset

Format: GeoTIFF
Coordinate reference system: EPSG:5514 - S-JTSK / Krovak East North
Coordinate units: meters
Columns: 6,000
Rows: 6,000
Bands: 1 (grayscale / panchromatic imagery)
Stored sample type: Unsigned 16-bit integer (UInt16)
Compression: LZW
Pixel size: 0.5 x 0.5 m
Grid orientation: North-up, no rotation
Pixel interpretation: Pixel is area
NoData value: 256

Projected bounding box (outer pixel edges, EPSG:5514):
Minimum easting (X):   -336650.0 m
Maximum easting (X):   -333650.0 m
Minimum northing (Y): -1189090.0 m
Maximum northing (Y): -1186090.0 m

Upper-left pixel center (also recorded in the world file):
X:  -336649.75 m
Y: -1186090.25 m

The GeoTIFF contains the CRS and georeferencing. The .tfw file
provides matching pixel size and pixel-center placement but
does not define the CRS by itself.

Raster dimensions, sample type, compression, CRS code, pixel
size, bounds, and NoData were checked against the supplied
GeoTIFF header and companion world file.


INTERPRETATION AND LIMITATIONS
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The 0.5 m output grid describes raster sampling. It does not
establish original sensor resolution or positional accuracy.
Positional and radiometric accuracy may vary because of source
image geometry, source quality, georeferencing, and mosaicking.
No independently measured positional accuracy is stated here.

The image is an input to interpretation, not a classified map.
Classes, boundaries, and land-cover statistics require review.
A temporal change analysis requires a comparable map from
another acquisition period. Editing versions of the same 1975
image do not represent observations from different dates.

The dataset is provided "as is" and is not intended for
cadastral, legal, engineering, or survey-grade applications.


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

The license applies to rights held by the Technical University
in Zvolen in the RETROCHANGE-derived dataset. The original USGS
imagery remains public-domain data under U.S. copyright law,
unless otherwise specified by the original provider.
See LICENSE.txt for the supplied license notice.

Recommended dataset citation:
Technical University in Zvolen (2026).
RETROCHANGE UC1 RETROCOVER Hrebienok 1975 KH-9 Image Subset.
Subset of the RETROCHANGE High Tatras 1975 KH-9 Satellite Image
Mosaic, version 1.0. RETROCHANGE project.
https://gis.tuzvo.sk/retrochange

Source imagery: Declassified KH-9 (HEXAGON) satellite imagery
courtesy of the U.S. Geological Survey (USGS), EROS Center.


CONTACT AND PROJECT WEBSITE
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Technical University in Zvolen
Faculty of Forestry
Department of Forest Resource Planning and Informatics
T. G. Masaryka 24, 960 01 Zvolen, Slovakia

https://gis.tuzvo.sk/retrochange
