Explore RETROCHANGE on the Slovak EOSC Service Gate
Four examples of using historical satellite imagery to reconstruct land cover, classify mountain forests, measure forest fragmentation and investigate canopy structure.
RETROCHANGE connects historical KH-9 Hexagon imagery with documented methods for forest and landscape research. Explore the four use cases presented in the project materials, watch the recorded demonstrations, and access the available workflows, guides, presentations and example data.
Choose RETROCOVER for mapping with expert review, RETROFOREST for supervised image classification, RETROFRAG for analysing existing forest maps, or RETROCANOPY for investigating small canopy openings in a historical image. RETROCOVER and RETROFOREST demonstrate complementary ways of producing historical land-cover maps. RETROFRAG starts from an existing forest/non-forest map and measures its spatial structure. RETROCANOPY works directly with a clipped historical image to examine finer forest gaps.
RETROCOVER
Historical Land-Cover Mapping in Tatra National Park
Create a historical land-cover map through image segmentation, expert interpretation and polygon editing in the Landscape application.
Šimon Saloň
Hrebienok, Tatra National Park, Slovakia · 2,500 ha demonstration area
RETROFOREST
Mountain Forest Classification from Historical Satellite Imagery
Classify mountain forest and other land cover using image texture, Random Forest models and spatially separated validation data.
Roman Sitko
High Tatras, Slovakia · Hrebienok, Bielovodská and Úplaz
RETROFRAG
Forest Fragmentation and Core-Forest Continuity
Measure forest patches, edges and core forest from existing forest/non-forest maps, and compare one area through time or two areas at one date.
Ladislav Šumichrast
Poloniny–Bieszczady · Ruské, Brzegi Górne and Havešová
RETROCANOPY
Historical Canopy Gap Analysis in Old-Growth Beech Forests
Map canopy-gap candidates in a historical image and examine their area, size distribution and spatial arrangement under explicit detection rules.
Ladislav Šumichrast
Havešová old-growth reserve, Poloniny National Park, Slovakia · 144.7 ha
The examples can inform new studies, but each requires suitable input data, explicit settings and interpretation appropriate to the study area. Each page explains the inputs, outputs and limits of the demonstrated method.