# nl_nsgi_README.txt The files in this section originate from [NSGI](https://www.nsgi.nl/) with corrected metadata. ## Included grids ### Netherlands: RD and NAP -> ETRS89 *Source*: [NSGI](https://www.nsgi.nl/rdnaptrans) *Format*: GeoTIFF converted from NTv2 & GTX *License*: [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/) Variant 1: * nl_nsgi_rdcorr2018.tif * nl_nsgi_nlgeo2018.tif Recommended variant, applies the datum transformation as a separate step using a 3D similarity transformation. Variant 2: * nl_nsgi_rdtrans2018.tif Includes the datum transformation in the correction grid. Refer to the [RDNAPTRANS™2018 documentation](https://www.nsgi.nl/rdnaptrans) for details.