Orthophotomosaic of Slovakia
The vast majority of decisions made within public administration have a spatial aspect. For this reason, it is essential that the public administration has accurate, reliable and up-to-date spatial data. In view of the rapidly changing landscape, mainly due to human activity, spatial data needs to be collected and updated using methods that are highly efficient, effective and fast. Such methods also include airborne imagery which results are processed into digital orthophotographs or orthophotomosaic. In view of the above, the Ministry of Agriculture and Rural Development of the Slovak Republic and the Geodesy, Cartography and Cadastre Authority of the Slovak Republic agreed on joint cooperation in the creation of the Orthophotomosaic of the Slovak Republic. Subordinate organizations - National Forest Centre (NLC) and Geodetic and Cartographic Institute Bratislava (GKÚ) were entrusted with this implementation.
The first production cycle (2017-2019) of the orthophotomosaic was completed in 2020. The airborne imagery was taken in the western part of Slovakia in 2017, in the central part of Slovakia in 2018 and in the eastern part of Slovakia in 2019.
The second production cycle (2020-2022) of the Orthophotomosaic was finished in 2023. The airborne imagery was taken in the western part of Slovakia in 2020, in the central part of Slovakia in 2021 and in the eastern part of Slovakia in 2022.
The third production cycle (2023-2025) of the Orthophotomosaic has begun in 2023. The airborne imagery was taken in the western part of Slovakia in 2023. The airborne imagery central part of Slovakia was taken in 2024. In the eastern part of Slovakia airborne iamgery was taken in 2025 and data will be available for download from 30.6.2026.
Plan for airborne imagery of the Slovakia territory in the 3rd cycle:
| Actual Orthophotomosaic in RGB for download | |||||
|---|---|---|---|---|---|
| Western part 2023 (RGB) | ZIP1 (128 GB) | ZIP2 (127 GB) | |||
| Central part 2024 (RGB) | ZIP1 (161 GB) | ZIP2 (168 GB) | |||
| Eastern part 2022 (RGB) | ZIP1 (81 GB) | ZIP2 (82 GB) | |||
| License terms | |||||
Data of a smaller extent, up to 20 map sheets, are freely downloadable through the MAPKA application. More information HERE. Orthophotomosaic data shall be subject to the Terms and conditions of provision and use of Orthtophotomosaic.
Orthophotomosaic of Slovakia from 1st cycle (2017-2019) can be downloaded here.
Orthophotomosaic of Slovakia from 2nd cycle (2020-2022) can be downloaded here.
Orthophotomosaic of Slovakia from 3rd cycle (2023-2025) can be downloaded here.
Orthophotomosaic in web application MAPKA:
Overview of airborne imageries with the exact date of their creation |
|
|---|---|
| 1st cycle (2017-2019) | Esri SHP |
| 2nd cycle (2020-2022) | Esri SHP |
| 3rd cycle (2023-2025) | Esri SHP |
| License terms | |
| Author | GKÚ Bratislava |
| License | CC-BY 4.0  |
| Map sheets layout | |||
|---|---|---|---|
| 1 : 5000 | Esri GDB | Esri SHP | GeoPackage |
Orthophotomosaic map sheet layout
Orthophotomosaic map sheet layout (administrative borders exluded)
| License terms | |
| Author | GKÚ Bratislava |
| License | CC-BY 4.0 |
Instructions for working with orthophotomosaics can be found at these links:
- How to work with Orthophotomosaic in QGIS application (Slovak only)
- How to connect georeferenced rasters to application Bentley MicroStation V8i (Slovak only)
- How to connect georeferenced rasters to application Kokeš (Slovak only)
- How to convert raster from format RGBN to RGB in IrfanView (Slovak only)
Comparison of basic information and parameters about the 1st, 2nd and 3rd production cycle of Orthophotomosaics of Slovakia
|
|
1st cycle |
2nd cycle |
3rd cycle |
|
Cycle duration: |
3 years (2017-2019) |
3 years (2020-2022) |
3 years (2023-2025) |
|
Imaging period: |
vegetation season (1.5. - 30.9.) |
vegetation season (1.5. - 17.10.) |
vegetation season (1.5. - 30.9.) |
|
Ground Sampling Distance (GSD): |
25 cm/pixel |
20 cm/pixel |
15 cm/pixel |
|
Number of channels: |
3 (RGB, 8-bit) |
4 (RGBN, 8-bit) |
4 (RGBN, 8-bit) |
|
Format: |
TIFF + TFW |
TIFF + TFW |
TIFF + TFW |
|
1 map sheet size: |
10 000 x 8 000 pixels |
12 500 x 10 000 pixels |
16 668 x 13 335 pixelov |
|
Coordinate reference system: |
S-JTSK(JTSK) - code EPSG:5514 |
S-JTSK(JTSK) - code EPSG:5514 |
S-JTSK(JTSK) - code EPSG:5514 |
|
Root mean square error RMSExy: |
0,30 m |
0,21 m |
0,17 m (western part) 0,18 m (central part) |