# dk_sdfi_README.txt

The files in this section result from the conversion of datasets originating
from [Agency for Data Supply and Infrastructure](https://sdfi.dk) (previously known as SDFE).

## Included grids

### ETRS89 -> GS-IRF

*Source*: [Agency for Data Supply and Infrastructure](https://sdfi.dki/vores-opgaver/geodaesi/koordinattransformation)  
*Format*: GTG  
*License*: [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/)

Transform ETRS89 coordinates (EPSG:4258) to Generalstabens Systems intermediate reference
frame (EPSG:1346), which is used as a stepping stone in the transformation between ETRS89
and GS.

* dk_sdfi_gs_2022.tif

### ETRS89 -> GSB-IRF

*Source*: [Agency for Data Supply and Infrastructure](https://sdfi.dki/vores-opgaver/geodaesi/koordinattransformation)  
*Format*: GTG  
*License*: [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/)

Transform ETRS89 coordinates (EPSG:4258) to Generalstabens Systems Bornholm intermediate
reference frame (EPSG:1347), which is used as a stepping stone in the transformation
between ETRS89 and GSB.

* dk_sdfi_gsb_2022.tif

### ETRS89 -> KK-IRF

*Source*: [Agency for Data Supply and Infrastructure](https://sdfi.dki/vores-opgaver/geodaesi/koordinattransformation)  
*Format*: GTG  
*License*: [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/)

Transform ETRS89 coordinates (EPSG:4258) to Københavns Kommunes System intermediate
reference frame (EPSG:1349), which is used as a stepping stone in the transformation
between ETRS89 and KK.

* dk_sdfi_kk_2022.tif

### ETRS89 -> OS-IRF

*Source*: [Agency for Data Supply and Infrastructure](https://sdfi.dki/vores-opgaver/geodaesi/koordinattransformation)  
*Format*: GTG  
*License*: [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/)

Transform ETRS89 coordinates (EPSG:4258) to System Ostenfeld (OS) intermediate
reference frame (EPSG:1350), which is used as a stepping stone in the transformation
between ETRS89 and OS.

* dk_sdfi_os_2022.tif

### ETRS89 -> S34J-IRF

*Source*: [Agency for Data Supply and Infrastructure](https://sdfi.dki/vores-opgaver/geodaesi/koordinattransformation)  
*Format*: GTG  
*License*: [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/)

Transform ETRS89 coordinates (EPSG:4258) to System 34 Jylland intermediate
reference frame (EPSG:1332), which is used as a stepping stone in the transformation
between ETRS89 and S34J.

* dk_sdfi_s34j_2022.tif

### ETRS89 -> S34S-IRF

*Source*: [Agency for Data Supply and Infrastructure](https://sdfi.dki/vores-opgaver/geodaesi/koordinattransformation)  
*Format*: GTG  
*License*: [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/)

Transform ETRS89 coordinates (EPSG:4258) to System 34 Sjælland intermediate
reference frame (EPSG:1337), which is used as a stepping stone in the transformation
between ETRS89 and S34S.

* dk_sdfi_s34s_2022.tif

### ETRS89 -> S45B-IRF

*Source*: [Agency for Data Supply and Infrastructure](https://sdfi.dki/vores-opgaver/geodaesi/koordinattransformation)  
*Format*: GTG  
*License*: [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/)

Transform ETRS89 coordinates (EPSG:4258) to System 45 Bornholm intermediate
reference frame (EPSG:1346), which is used as a stepping stone in the transformation
between ETRS89 and S45B.

* dk_sdfi_s45b_2022.tif

### ETRS89 -> DVR90

*Source*: [Agency for Data Supply and Infrastructure](https://sdfi.dki/vores-opgaver/geodaesi/koordinattransformation)  
*Format*: GTG  
*License*: [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/)

Transform ETRS89 ellipsoidal heights (EPSG:4937) to DVR90. The DVR90 ensemble (EPSG:5799) includes
three realizations which have a related grid transformation:

1. DVR90(2002), EPSG:10483
2. DVR90(2013), EPSG:10484
3. DVR90(2023), EPSG:10485

* dk_sdfi_dvr90_2002.tif
* dk_sdfi_dvr90_2013.tif
* dk_sdfi_dvr90_2023.tif