EOSC Gravity RETROCHANGE
Technical University in Zvolen
Funded by the European Union

RETROCHANGE use cases and open services

Retrospective forest and landscape change analysis from historical satellite imagery.

1975
KH-9 Hexagon imagery
877
GeoTIFF map sheets
2
cross-border study areas

Open services

View, connect to or download the imagery.

Web map comparing present-day colour imagery with 1975 black-and-white imagery of the same valley

RETROCHANGE Interactive Web Map

Explore the 1975 imagery in your browser and compare it with contemporary orthophotos in single, swipe or side-by-side view.

  • Web application
  • No account needed
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Illustration of stacked map layers: map sheets, 1975 imagery and a landscape base map

RETROCHANGE Web Map Services

Public map services for the imagery and its reference layers, ready to add to QGIS, ArcGIS Pro or your own web maps.

  • OGC WMS
  • ArcGIS REST
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High Tatras imagery mosaic divided into a red grid of map sheets

RETROCHANGE Data Packages

Georeferenced GeoTIFF map sheets to download: 551 for the High Tatras and 326 for Poloniny–Bieszczady. Registration required.

  • GeoTIFF
  • 0.5 m pixel grid
  • CC BY 4.0
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Use cases

Documented research workflows you can reproduce and reuse.

1975 imagery of Hrebienok partly mapped, with forest polygons in green and a selected polygon in purple Land-cover review

RETROCOVER

Historical land-cover mapping

Turns a black-and-white image into a documented land-cover map through image segmentation and expert review.

Hrebienok, Tatra National Park · 1975

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Mountain scene split in two: 1975 imagery on the left, classified forest and non-forest map on the right 1975 image Classification

RETROFOREST

Mountain forest classification

Tests how well tone, texture and terrain separate forest from dwarf pine, using Random Forest models and spatial validation.

High Tatras, three scenes · 1975

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Valley split in two: 1975 imagery on the left, forest morphology map with core forest and edges on the right 1975 image Morphology

RETROFRAG

Forest fragmentation and core forest

Measures forest patches, edges and core forest from forest maps, for one area or compared across dates and areas.

Poloniny–Bieszczady · 1975 and 2017

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Forest canopy split in two: 1975 imagery on the left, the same view with detected canopy gaps in brown on the right 1975 image Canopy gaps

RETROCANOPY

Historical canopy gap analysis

Reveals small canopy openings and disturbance patterns in an old-growth beech forest from a single satellite image.

Havešová, Poloniny National Park · 1975

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