{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"BoundCRS","source_crs":{"type":"BoundCRS","source_crs":{"type":"ProjectedCRS","name":"S-JTSK / Krovak","base_crs":{"type":"GeographicCRS","name":"S-JTSK","datum":{"type":"GeodeticReferenceFrame","name":"System of the Unified Trigonometrical Cadastral Network","ellipsoid":{"name":"Bessel 1841","semi_major_axis":6377397.155,"inverse_flattening":299.1528128}},"coordinate_system":{"subtype":"ellipsoidal","axis":[{"name":"Geodetic latitude","abbreviation":"Lat","direction":"north","unit":"degree"},{"name":"Geodetic longitude","abbreviation":"Lon","direction":"east","unit":"degree"}]},"id":{"authority":"EPSG","code":4156},"remarks":"Greenwich-referenced equivalent to S-JTSK (CRS code 4818). Technically improved and replaced through S-JTSK [JTSK03] in Slovakia, CRS code 8351. Remains the legal system in Czechia but see scientific working system CRSs 5228 and 5229."},"conversion":{"name":"Krovak (Greenwich)","method":{"name":"Krovak","id":{"authority":"EPSG","code":9819}},"parameters":[{"name":"Latitude of projection centre","value":49.5,"unit":"degree","id":{"authority":"EPSG","code":8811}},{"name":"Longitude of origin","value":24.8333333333333,"unit":"degree","id":{"authority":"EPSG","code":8833}},{"name":"Co-latitude of cone axis","value":30.2881397527778,"unit":"degree","id":{"authority":"EPSG","code":1036}},{"name":"Latitude of pseudo standard parallel","value":78.5,"unit":"degree","id":{"authority":"EPSG","code":8818}},{"name":"Scale factor on pseudo standard parallel","value":0.9999,"unit":"unity","id":{"authority":"EPSG","code":8819}},{"name":"False easting","value":0,"unit":"metre","id":{"authority":"EPSG","code":8806}},{"name":"False northing","value":0,"unit":"metre","id":{"authority":"EPSG","code":8807}}]},"coordinate_system":{"subtype":"Cartesian","axis":[{"name":"Southing","abbreviation":"X","direction":"south","unit":"metre"},{"name":"Westing","abbreviation":"Y","direction":"west","unit":"metre"}]},"id":{"authority":"EPSG","code":5513}},"target_crs":{"type":"GeographicCRS","name":"S-JTSK [JTSK03]","datum":{"type":"GeodeticReferenceFrame","name":"System of the Unified Trigonometrical Cadastral Network [JTSK03]","ellipsoid":{"name":"Bessel 1841","semi_major_axis":6377397.155,"inverse_flattening":299.1528128}},"coordinate_system":{"subtype":"ellipsoidal","axis":[{"name":"Geodetic latitude","abbreviation":"Lat","direction":"north","unit":"degree"},{"name":"Geodetic longitude","abbreviation":"Lon","direction":"east","unit":"degree"}]},"id":{"authority":"EPSG","code":8351},"remarks":"Defined by transformation from ETRS89 (ETRF2000 realization) (transformation code 8365) to improve the scale and homogeneity of S-JTSK (CRS 4156) within Slovakia."},"transformation":{"name":"Inverse of S-JTSK [JTSK03] to S-JTSK (1)","method":{"name":"Inverse of NADCON","id":{"authority":"INVERSE(EPSG)","code":9613}},"parameters":[{"name":"Latitude difference file","value":"Slovakia_JTSK03_to_JTSK.LAS","id":{"authority":"EPSG","code":8657}},{"name":"Longitude difference file","value":"Slovakia_JTSK03_to_JTSK.LOS","id":{"authority":"EPSG","code":8658}}],"id":{"authority":"INVERSE(EPSG)","code":8364}}},"target_crs":{"type":"GeographicCRS","name":"ETRS89-SVK [SKTRF09]","datum":{"type":"GeodeticReferenceFrame","name":"ETRS89-SVK [SKTRF09]","anchor_epoch":2008.5,"ellipsoid":{"name":"GRS 1980","semi_major_axis":6378137,"inverse_flattening":298.257222101}},"coordinate_system":{"subtype":"ellipsoidal","axis":[{"name":"Geodetic latitude","abbreviation":"Lat","direction":"north","unit":"degree"},{"name":"Geodetic longitude","abbreviation":"Lon","direction":"east","unit":"degree"}]},"id":{"authority":"EPSG","code":11076},"remarks":"Horizontal component of national realization of ETRS89 in Slovakia. From 2024-04-01 replaced by ETRS89-SVK [SKTRF2022] (CRS code 11079)."},"transformation":{"name":"S-JTSK [JTSK03] to ETRS89-SVK [SKTRF09] (1)","source_crs":{"type":"GeographicCRS","name":"S-JTSK [JTSK03]","datum":{"type":"GeodeticReferenceFrame","name":"System of the Unified Trigonometrical Cadastral Network [JTSK03]","ellipsoid":{"name":"Bessel 1841","semi_major_axis":6377397.155,"inverse_flattening":299.1528128}},"coordinate_system":{"subtype":"ellipsoidal","axis":[{"name":"Geodetic latitude","abbreviation":"Lat","direction":"north","unit":"degree"},{"name":"Geodetic longitude","abbreviation":"Lon","direction":"east","unit":"degree"}]},"id":{"authority":"EPSG","code":8351},"remarks":"Defined by transformation from ETRS89 (ETRF2000 realization) (transformation code 8365) to improve the scale and homogeneity of S-JTSK (CRS 4156) within Slovakia."},"method":{"name":"Coordinate Frame rotation (geog2D domain)","id":{"authority":"EPSG","code":9607}},"parameters":[{"name":"X-axis translation","value":485.021,"unit":"metre","id":{"authority":"EPSG","code":8605}},{"name":"Y-axis translation","value":169.465,"unit":"metre","id":{"authority":"EPSG","code":8606}},{"name":"Z-axis translation","value":483.839,"unit":"metre","id":{"authority":"EPSG","code":8607}},{"name":"X-axis rotation","value":-7.786342,"unit":{"type":"AngularUnit","name":"arc-second","conversion_factor":4.84813681109536e-06},"id":{"authority":"EPSG","code":8608}},{"name":"Y-axis rotation","value":-4.397554,"unit":{"type":"AngularUnit","name":"arc-second","conversion_factor":4.84813681109536e-06},"id":{"authority":"EPSG","code":8609}},{"name":"Z-axis rotation","value":-4.102655,"unit":{"type":"AngularUnit","name":"arc-second","conversion_factor":4.84813681109536e-06},"id":{"authority":"EPSG","code":8610}},{"name":"Scale difference","value":0,"unit":{"type":"ScaleUnit","name":"parts per million","conversion_factor":1e-06},"id":{"authority":"EPSG","code":8611}}],"id":{"authority":"EPSG","code":11527}}}