# pl_gugik_README.txt

The files in this section result from the conversion of datasets originating
from [GUGiK](http://www.gugik.gov.pl)

## Included grids

### Poland vertical grid:

*Source*: [GUGiK](http://www.gugik.gov.pl/bip/prawo/modele-danych)  
*Format*: GeoTIFF converted from 'XYZ ASCII Grid'  
*License*: [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/)  
*Credit*: (c) Główny Urząd Geodezji i Kartografii  
*Horizontal CRS*: EPSG:9701 (ETRF2000-PL)

Two vertical transformations for Geoid model PL-geoid-2011. Used to make the transitions
from heights in vertical CRS (EPSG:9651 - EVRF2007-PL height) or (EPSG:9650 - Baltic 1986 height)
to heights above the ellipsoid in ETRF2000-PL (EPSG:9701).

* pl_gugik_geoid2011-PL-EVRF2007-NH.tif
* pl_gugik_geoid2011-PL-KRON86-NH.tif

Vertical transformation for Geoid model PL-geoid-2021. Used to make the transitions
from heights in vertical CRS (EPSG:9651 - EVRF2007-PL height) to heights above the ellipsoid
in ETRF2000-PL (EPSG:9701).

* pl_gugik_geoid2021-PL-EVRF2007-NH.tif