diff options
| author | Even Rouault <even.rouault@spatialys.com> | 2019-12-16 20:27:09 +0100 |
|---|---|---|
| committer | Even Rouault <even.rouault@spatialys.com> | 2019-12-16 20:27:09 +0100 |
| commit | 204ed7ff3ee4462bf4c0ffa327683bcaabe13eff (patch) | |
| tree | 06bfee8273236655eb65373e966c38dcfd6d1bbe /uk_os | |
| parent | 9550eef8af6001ebdce4fe1a1f58a981bba45444 (diff) | |
| download | PROJ-data-204ed7ff3ee4462bf4c0ffa327683bcaabe13eff.tar.gz PROJ-data-204ed7ff3ee4462bf4c0ffa327683bcaabe13eff.zip | |
Add README files
Diffstat (limited to 'uk_os')
| l--------- | uk_os/.github/README.md | 1 | ||||
| -rw-r--r-- | uk_os/README.uk_os | 46 |
2 files changed, 47 insertions, 0 deletions
diff --git a/uk_os/.github/README.md b/uk_os/.github/README.md new file mode 120000 index 0000000..e7f4e67 --- /dev/null +++ b/uk_os/.github/README.md @@ -0,0 +1 @@ +../README.uk_os
\ No newline at end of file diff --git a/uk_os/README.uk_os b/uk_os/README.uk_os new file mode 100644 index 0000000..101c87d --- /dev/null +++ b/uk_os/README.uk_os @@ -0,0 +1,46 @@ +# README.uk_os + +The files in this section result from the conversion of datasets originating +from [Ordnance Survey](https://www.ordnancesurvey.co.uk) + +## Included grids + +### Ireland: OSGM15 height, Malin head datum -> ETRS89 ellipsoidal heights + +*Source*: [Ordnance Survey](https://www.ordnancesurvey.co.uk/business-and-government/help-and-support/navigation-technology/os-net/formats-for-developers.html) +*Format*: GeoTIFF converted from GTX +*License*: [The 2-Clause BSD License](https://opensource.org/licenses/bsd-license.php) + +Vertical transformation for Geoid model OSGM15, Malin head datum (EPSG:5731). Used in +transformation from OSGM15 orthometric heights to WGS84/ETRS89 ellipsoidal heights. +The Malin Head datum is used in the Republic of Ireland. + +* OSGM15_Malin.tif + +### Northern Ireland: OSGM15 height, Belfast height -> ETRS89 ellipsoidal heights + +*Source*: [Ordnance Survey](https://www.ordnancesurvey.co.uk/business-and-government/help-and-support/navigation-technology/os-net/formats-for-developers.html) +*Format*: GeoTIFF converted from GTX +*License*: [The 2-Clause BSD License](https://opensource.org/licenses/bsd-license.php) + +Vertical transformation for Geoid model OSGM15, Belfast datum (EPSG:5732). Used in +transformation from OSGM15 orthometric heights to WGS84/ETRS89 ellipsoidal heights. +The Belfast datum is used in the Northern Ireland. + +* OSGM15_Belfast.tif + +### United Kingdom: OSGB36 -> ETRS89 + +*Source*: [Ordnance Survey](https://www.ordnancesurvey.co.uk/business-and-government/help-and-support/navigation-technology/os-net/formats-for-developers.html) +*Format*: GeoTIFF converted from NTv2 +*License*: [The 2-Clause BSD License](https://opensource.org/licenses/bsd-license.php) + +OSTN15 is the definitive OSGB36/ETRS89 transformation. OSTN15 in combination with the ETRS89 +coordinates of the OS Net stations, rather than the old triangulation network, define the National +Grid. This means that, for example, the National Grid coordinates of an existing OSGB36 point, +refixed using GNSS from OS Net and OSTN15, will be the correct ones. The original archived +OSGB36 National Grid coordinates of the point (if different) will be wrong, by definition, but the +two coordinates (new and archived) will agree on average to better than 0.1m (0.1m rmse, 68% +probability). + +* OSTN15_NTv2_OSGBtoETRS.tif |