# S-JTSK South West EPSG:5513 upside down transformation **URL:** \ **Category:** PIX4Dmapper Questions/Troubleshooting\ **Created:** [May 25, 2023, 11:42am UTC](https://community.pix4d.com/t/s-jtsk-south-west-epsg-5513-upside-down-transformation/26566 "2023-05-25T11:42:00Z")\ **Posts on this page:** 8\ **Page:** 2
**Author:** ![drone10](https://avatars.discourse-cdn.com/v4/letter/d/3bc359/32.png) [@drone10](https://community.pix4d.com/u/drone10)\ **Post date:** [August 21, 2023, 11:59am UTC](https://community.pix4d.com/t/s-jtsk-south-west-epsg-5513-upside-down-transformation/26566/21 "2023-08-21T11:59:59Z")
I am using RTK drone and also GCPs. If I just change the extension from .txt to .prj, I just create txt file with .prj in the end, but its okay if I modify .prj file in notepad and then insert text from .txt file. Unfortunately 5228 is different and Pix4D cannot read this file. ![Snímek obrazovky 2023-08-21 135130](https://global.discourse-cdn.com/pix4d/original/2X/7/7ff68c84da4aad06fbc9c424aa548a55729e5925.png) If you open this file, you can see difference: [5228.prj](https://community.pix4d.com/uploads/short-url/ugE7vXVv4XyQQOruVyS39kuZfqb.prj) (517 Bytes) ---
**Author:** ![Daniele\_Lecci](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/daniele_lecci/32/9493_2.png) [@Daniele\_Lecci](https://community.pix4d.com/u/Daniele_Lecci)\ **Post date:** [August 21, 2023, 1:23pm UTC](https://community.pix4d.com/t/s-jtsk-south-west-epsg-5513-upside-down-transformation/26566/22 "2023-08-21T13:23:25Z")
Please note that you can only use a projected reference coordinate system as an output reference coordinate system in PIX4Dmapper. ---
**Author:** ![drone10](https://avatars.discourse-cdn.com/v4/letter/d/3bc359/32.png) [@drone10](https://community.pix4d.com/u/drone10)\ **Post date:** [August 21, 2023, 2:57pm UTC](https://community.pix4d.com/t/s-jtsk-south-west-epsg-5513-upside-down-transformation/26566/23 "2023-08-21T14:57:39Z")
Oh, okay… so there is no possibility to use EPSG 5228 in PIX4D mapper? ---
**Author:** ![Daniele\_Lecci](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/daniele_lecci/32/9493_2.png) [@Daniele\_Lecci](https://community.pix4d.com/u/Daniele_Lecci)\ **Post date:** [August 21, 2023, 3:15pm UTC](https://community.pix4d.com/t/s-jtsk-south-west-epsg-5513-upside-down-transformation/26566/24 "2023-08-21T15:15:21Z")
Not as GCP or Output coordinate reference system. > **[Error e9027: The coordinate sytem in file is not valid - PIX4Dmapper](https://support.pix4d.com/hc/en-us/articles/10338412835101-Error-e9027-The-coordinate-sytem-in-file-is-not-valid-PIX4Dmapper)** > > Error description: e9027 The coordinate system in the file is not valid. The output coordinate system must be a projection or arbitrary coordinate system. This article highlights a few of the most ... ---
**Author:** ![drone10](https://avatars.discourse-cdn.com/v4/letter/d/3bc359/32.png) [@drone10](https://community.pix4d.com/u/drone10)\ **Post date:** [August 21, 2023, 4:01pm UTC](https://community.pix4d.com/t/s-jtsk-south-west-epsg-5513-upside-down-transformation/26566/25 "2023-08-21T16:01:40Z")
I think I understand that. Unfortunately, it’s quite complicated here in terms of coordinate systems, and I’m also quite new to this field. ![image](https://global.discourse-cdn.com/pix4d/original/2X/c/c55a4fe24f5e2a4cafd2831c780078febf20bc6e.jpeg) Can you just please explain to me how you got the file 5513.prj above? If I download the files highlighted in this image and make them .prj, they don’t work and they don’t work because the text in them is completely different from the one you sent me. Here is yours: [5513.prj](https://community.pix4d.com/uploads/short-url/kV7K6ZQe5dbzj0x75Q4hFfIXHC4.prj) (778 Bytes) Here is from the site: [5513.prj](https://community.pix4d.com/uploads/short-url/xp5XGqeOUKdmWVBBSCxxVpRkfIF.prj) (1.7 KB) I would just like to find at least one coordinate system that is compatible with our equipment and works correctly in Pix4D… I’ve just tried 5515 which is projected, but unfortunately doesn’t work - same problem. ---
**Author:** ![Daniele\_Lecci](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/daniele_lecci/32/9493_2.png) [@Daniele\_Lecci](https://community.pix4d.com/u/Daniele_Lecci)\ **Post date:** [August 23, 2023, 9:28am UTC](https://community.pix4d.com/t/s-jtsk-south-west-epsg-5513-upside-down-transformation/26566/26 "2023-08-23T09:28:20Z")
Hi @drone10, In the end I used another way to get the prj using PIX4Dmapper’s log file. 1. Open the .p4d file using a text editor 2. Find the `` string for the `` coordinate system 3. Copy the content of the `` string: ```auto PROJCS["S-JTSK / Krovak", GEOGCS["S-JTSK", DATUM["System_of_the_Unified_Trigonometrical_Cadastral_Network", SPHEROID["Bessel 1841",6377397.155,299.1528128, AUTHORITY["EPSG","7004"]], TOWGS84[589,76,480,0,0,0,0], AUTHORITY["EPSG","6156"]], PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]], UNIT["degree",0.0174532925199433, AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4156"]], PROJECTION["Krovak"], PARAMETER["latitude_of_center",49.5], PARAMETER["longitude_of_center",24.8333333333333], PARAMETER["azimuth",30.2881397527778], PARAMETER["pseudo_standard_parallel_1",78.5], PARAMETER["scale_factor",0.9999], PARAMETER["false_easting",0], PARAMETER["false_northing",0], UNIT["metre",1,AUTHORITY["EPSG","9001"]], AXIS["Southing",SOUTH], AXIS["Westing",WEST], AUTHORITY["EPSG","5513"]] ``` into a new text file and then change ```auto AXIS["Southing",SOUTH], AXIS["Westing",WEST], ``` into ```auto AXIS["Westing",WEST], AXIS["Southing",SOUTH], ``` 1. Save the file with `.prj` string I hope this helps. ---
**Author:** ![drone10](https://avatars.discourse-cdn.com/v4/letter/d/3bc359/32.png) [@drone10](https://community.pix4d.com/u/drone10)\ **Post date:** [September 20, 2023, 11:21am UTC](https://community.pix4d.com/t/s-jtsk-south-west-epsg-5513-upside-down-transformation/26566/27 "2023-09-20T11:21:32Z")
Hello, I’m writing again after some trial and errors. If I try the method described above, I get the following error: ![Snímek obrazovky 2023-09-20 131450](https://global.discourse-cdn.com/pix4d/original/2X/e/e052f31fc53b8bd273d935e3b155aad1ab099ea8.png) I am trying to create a .prj file for EPSG:5515 which is projected. The format should be correct, but it still throws this error and the coordinates show it incorrectly after the transformation. Here is the file: [5515.prj](https://community.pix4d.com/uploads/short-url/oGyfPgLbdiQ6jNRIiAiUYxOgUn2.prj) (886 Bytes) And here is the format: PROJCS[“S-JTSK/05 / Modified Krovak”, GEOGCS[“S-JTSK/05”, DATUM[“System\_of\_the\_Unified\_Trigonometrical\_Cadastral\_Network\_05”, SPHEROID[“Bessel 1841”,6377397.155,299.1528128, AUTHORITY[“EPSG”,“7004”]], AUTHORITY[“EPSG”,“1052”]], TOWGS84[589,76,480,0,0,0,0], PRIMEM[“Greenwich”,0, AUTHORITY[“EPSG”,“8901”]], UNIT[“degree”,0.0174532925199433, AUTHORITY[“EPSG”,“9122”]], AUTHORITY[“EPSG”,“5228”]], PROJECTION[“Krovak\_Modified”], PARAMETER[“Latitude of projection centre”,49.5], PARAMETER[“Longitude of origin”,24.8333333333333], PARAMETER[“Co-latitude of cone axis”,30.2881397222222], PARAMETER[“Latitude of pseudo standard parallel”,78.5], PARAMETER[“Scale factor on pseudo standard parallel”,0.9999], PARAMETER[“False easting”,5000000], PARAMETER[“False northing”,5000000], UNIT[“metre”,1, AUTHORITY[“EPSG”,“9001”]], AXIS[“Westing”,WEST], AXIS[“Southing”,SOUTH], AUTHORITY[“EPSG”,“5515”]] Can you please help me with the solution? ---
**Author:** ![Daniele\_Lecci](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/daniele_lecci/32/9493_2.png) [@Daniele\_Lecci](https://community.pix4d.com/u/Daniele_Lecci)\ **Post date:** [September 25, 2023, 2:19pm UTC](https://community.pix4d.com/t/s-jtsk-south-west-epsg-5513-upside-down-transformation/26566/28 "2023-09-25T14:19:16Z")
Hi, Please note that what you see is a warning and not an error. You can find additional information here: > **[Warning w0011: "The loaded .prj file does not contain the TOWGS84 parameter....](https://support.pix4d.com/hc/en-us/articles/202560849)** > > Error > "The loaded .prj file does not contain the TOWGS84 parameter. This may lead to incorrect georeferencement." > Error when importing .prj file with the coordinate system. >   > Description > When impor... 1. Click **OK**. If the software can recognize the coordinate system, it will appear in the next pop up window _Edit coordinate system._ 2. Verify that the right new coordinate system appears in the pop up window _Edit coordinate system._ 3. In the main window, verify that the points representing the images are located correctly in the place where they are supposed to be located. Let me know how it goes. [Previous page](https://community.pix4d.com/t/s-jtsk-south-west-epsg-5513-upside-down-transformation/26566.md?page=1)