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I have standalone program that based on geodata generates zone coordinates. I dont know what projection system is used but I have a lot of example data. All of them are in Poland i.e.

lon lat lon1 lat1

  1. 19,112476 50,259939 508 266
  2. 17,02595 51,08383 356 357
  3. 19,902374 50,007719 563 238
  4. 19,948689 49,838334 566 219
  5. 19,00879444 50,101288 501 248
  6. 18,793566 50,321204 487 273
  7. 19,133759 50,256733 510 266
  8. 19,039863 50,281821 503 269
  9. 18,976984 49,829918 498 218
  10. 18,435098 50,055016 463 243
  11. 19,375353 51,345391 527 386
  12. 21,53695 53,068261 672 579
  13. 19,523826 51,741878 537 430
  14. 19,450966 51,711538 532 427
  15. 18,65008 51,598973 477 414
  16. 22,559479 51,211099 748 371
  17. 20,519703 53,77942 603 658
  18. 23,08975 53,15784 788 589
  19. 20,816318 52,402991 624 505
  20. 20,899545 52,289099 629 493

I recognize that system is similar to polish cs92 ( one to one kilometer web) but calculations works mainly for Warsaw ( 21E ) other localalization generates some differences Anyone has idea how to recognize what system is used in program ?

pawel
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  • Welcome to GIS SE! We're a little different from other sites; this isn't a discussion forum but a Q&A site. Please check out our short [tour] to learn about our focussed Q&A format. To use the advice in the duplicate you may have to create a shapefile from your X,Y coordinates first. – PolyGeo Apr 01 '19 at 20:30
  • You can use the Identify tool to help figure this out. When you click on a point with this tool, QGIS calculates coordinates in the project CRS (derived attributes > clicked coordinate x and clicked coordinate y). So make a reasonable guess at the CRS, change the project to that CRS, and click on a point. Try it with different CRS's until you find the one where the clicked coordinate values match up (approximately) with the calculated ones. – csk Apr 01 '19 at 20:39
  • Do you have access to the source code of this "standalone program?" It might be worth reading through the code to see if you can figure it out (best case scenario, the programmer wrote a comment like #convert point coordinates from EPSG:4326 to EPSG:5639). – csk Apr 01 '19 at 20:44

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