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Created September 13, 2025 16:17
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meteo_radar_api.md

CHMI weather radar API research

Original source Daniel Peukert - Gitlab

Timezone

  • all versions use GMT

URL format

  • PREFIX.z_max3d.YYYYMMDD.HHMM.0.png
  • for all versions except Meteor and radareu.cz

Map projection

  • AFAIK, all versions use EPSG:3857 (Google/Web Mercator)

Versions

Version used by the original JSRadView

  • PREFIX = http://portal.chmi.cz/files/portal/docs/meteo/rad/data_tr_png_1km/pacz23
  • 15 minute interval
  • images saved for approximately 2.5 days
  • w/ borders
  • big copyright text
  • 810x610

Version used by the new INCA viewer

  • PREFIX = http://portal.chmi.cz/files/portal/docs/meteo/rad/inca-cz/data/czrad-z_max3d/pacz2gmaps3
  • 10 minute interval
  • w/ borders
  • cropped JSRadView image
  • big copyright text
  • 680x460
  • coordinates
    • top left - 52.167, 11.267
    • bottom right - 48.047, 20.77

Version used by radar.bourky.cz

  • PREFIX = http://radar.bourky.cz/data/pacz2gmaps
  • 10 minute interval
  • w/o borders
  • slightly different position compared to the 2 versions before
  • small copyright text
  • 728x528
  • coordinates
    • top left - 51.889, 10.060
    • bottom right - 47.090, 20.223

Version used by radar4ctu.bourky.cz

  • PREFIX = http://radar4ctu.bourky.cz/data/pacz2gmaps
  • same as the radar.bourky.cz version, except this version is without corrections and has a 15 minute interval

Version used by the Meteor Android app

  • http://1 or 2 or 3.meteor.androworks.org/images/radar/image-YYYYMMDD.HHMM - images
  • http://1 or 2 or 3.meteor.androworks.org/images/thumb/image-YYYYMMDD.HHMM - thumbnails
  • http://1 or 2 or 3.meteor.androworks.org/feed - the X-Frame-Date HTTP header has the latest available frame in a YYYYMMDD.HHMM format
  • 10 minute interval
  • images saved for 5 hours (last 30 images)
  • w/o borders
  • no copyright text
  • 597x377
  • coordinates
    • top left - 51.452389, 11.289632
    • bottom right - 48.062307, 19.613042

Version used by radareu.cz - most of Europe

  • PREFIX = http://www.radareu.cz/data/radar/radar.anim
  • FORMAT = PREFIX.YYYYMMDD.HHMM.0.png
  • 15 minute interval
  • images saved since 20160329.0430
  • w/o borders
  • no copyright text
  • 3196x4000
  • coordinates
    • top left - 72.62025190354672, -14.618225054687514
    • bottom right - 30.968189526345665, 45.314636273437486
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