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| -rw-r--r-- | docs/source/resource_files.rst | 38 | ||||
| -rw-r--r-- | docs/source/usage/transformation.rst | 2 |
2 files changed, 1 insertions, 39 deletions
diff --git a/docs/source/resource_files.rst b/docs/source/resource_files.rst index c0321b18..ab9dd01b 100644 --- a/docs/source/resource_files.rst +++ b/docs/source/resource_files.rst @@ -93,44 +93,6 @@ Non-Free Grids Not all grid shift files have licensing that allows them to be freely distributed, but can be obtained by users through free and legal methods. -Canada NTv2.0 -................................................................................ -Although NTv1 grid shifts are provided freely with PROJ, the higher-quality -NTv2.0 file needs to be downloaded from Natural Resources Canada. More info: -http://www.geod.nrcan.gc.ca/tools-outils/ntv2_e.php. - -Procedure: - -1. Visit the `NTv2 <http://webapp.geod.nrcan.gc.ca/geod/tools-outils/applications.php?locale=en#ntv2>`__, and register/login -2. Follow the Download NTv2 link near the bottom of the page. -3. Unzip ``ntv2_100325.zip`` (or similar), and move the grid shift file ``NTV2_0.GSB`` to the proj directory (be sure to change the name to lowercase for consistency) - e.g.: ``mv NTV2_0.GSB /usr/local/share/proj/ntv2_0.gsb`` -4. Test it using: - - :: - - cs2cs +proj=latlong +ellps=clrk66 +nadgrids=@ntv2_0.gsb +to +proj=latlong +ellps=GRS80 +datum=NAD83 - -111 50 - - :: - - 111d0'3.006"W 50d0'0.103"N 0.000 # correct answer - -Australia -................................................................................ - -`Geocentric Datum of Australia AGD66/AGD84 <http://www.icsm.gov.au/gda/tech.html>`__ - -Canada -................................................................................ - -`Canadian NTv2 grid shift binary <http://open.canada.ca/data/en/dataset/b3534942-31ea-59cf-bcc3-f8dc4875081a>`__ for NAD27 <=> NAD83. - -Germany -................................................................................ - -`German BeTA2007 DHDN GK3 => ETRS89/UTM <http://crs.bkg.bund.de/crseu/crs/descrtrans/BeTA/de_dhdn2etrs_beta.php>`__ - Great Britain ................................................................................ diff --git a/docs/source/usage/transformation.rst b/docs/source/usage/transformation.rst index b4ed7031..8b3e8c6a 100644 --- a/docs/source/usage/transformation.rst +++ b/docs/source/usage/transformation.rst @@ -252,7 +252,7 @@ Skipping Missing Grids The special prefix ``@`` may be prefixed to a grid to make it optional. If it not found, the search will continue to the next grid. Normally any grid not found will cause an error. For instance, the following would use the -``ntv2_0.gsb`` file if available (see :ref:`nonfreegrids`), otherwise it would +``ntv2_0.gsb`` file if available, otherwise it would fallback to using the ``ntv1_can.dat`` file. :: |