From 9e0148f844ab4d94542916d01ea5d4aac75cb28a Mon Sep 17 00:00:00 2001
From: Martin Dobias <wonder.sk@gmail.com>
Date: Wed, 19 Feb 2020 23:00:52 +0100
Subject: Added more comments

---
 data/sql/grid_alternatives.sql | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'data/sql/grid_alternatives.sql')

diff --git a/data/sql/grid_alternatives.sql b/data/sql/grid_alternatives.sql
index 1c3f3f2e..1fbf61e3 100644
--- a/data/sql/grid_alternatives.sql
+++ b/data/sql/grid_alternatives.sql
@@ -2112,6 +2112,12 @@ INSERT INTO grid_alternatives(original_grid_name,
                               NULL, NULL, NULL, NULL);
 
 -- Slovakia
+--
+-- The definition of EPSG:8364 (JTSK03 to JTSK) uses NADCON method which is not supported by PROJ.
+-- UGKK (Slovak Geodetic and Cartographic Institute) provides also NTv2 grid file in addition
+-- to NADCON .las/.los files, so we define the NTv2 file here as an alternative.
+-- The file is available at https://www.geoportal.sk/files/gz/slovakia_jtsk03_to_jtsk_ntv2.zip
+-- but it does not have a confirmed license yet, so it is not available in proj-datumgrid-europe for now
 INSERT INTO grid_alternatives(original_grid_name,
                               proj_grid_name,
                               proj_grid_format,
-- 
cgit v1.2.3

