Add NTv2 grids for Portugal, for convertion between Portuguese Lisbon…

… Datum and Datum 73 to ETRS89 (#54)
OSGeo · Sep 1, 2019 · 46e538f · 46e538f
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diff --git a/europe/D73_ETRS89_geo.gsb b/europe/D73_ETRS89_geo.gsb
diff --git a/europe/DLx_ETRS89_geo.gsb b/europe/DLx_ETRS89_geo.gsb
diff --git a/europe/README.EUROPE b/europe/README.EUROPE
@@ -262,3 +262,33 @@ The difference between the grid and finite element transformation is on a level
 
 * CHENyx06a.gsb
 * CHENyx06_ETRS.gsb
+
+### Portugal: Lisbon Datum -> ETRS89
+
+Grid transformation from Portuguese Lisbon Datum to ETRS89 in Portugal.
+
+*Source*: [DGT](http://www.dgterritorio.pt/cartografia_e_geodesia/geodesia/transformacao_de_coordenadas/grelhas_em_ntv2/)
+*Format*: NTv2
+*License*: [Creative Commons Attribution 4.0](http://creativecommons.org/licenses/by/4.0/)
+*Credit*: (c)2019 Directorate-General for the Territorial Development.
+
+Derived from 1129 common stations in the national geodetic network. 
+Residuals at 130 further test points average 0.09m, maximum 0.30m.
+Recommended to transform from Portuguese Lisbon Datum (EPSG:20790) to ETRS89 in Portugal (EPSG:3763).
+
+* DLx_ETRS89_geo.gsb
+
+### Portugal: Datum 73 -> ETRS89
+
+Grid transformation from Portuguese Datum 73 to ETRS89 in Portugal.
+
+*Source*: [DGT](http://www.dgterritorio.pt/cartografia_e_geodesia/geodesia/transformacao_de_coordenadas/grelhas_em_ntv2/)
+*Format*: NTv2
+*License*: [Creative Commons Attribution 4.0](http://creativecommons.org/licenses/by/4.0/)
+*Credit*: (c)2019 Directorate-General for the Territorial Development.
+
+Derived from 1129 common stations in the national geodetic network. 
+Residuals at 130 further test points average 0.06m, maximum 0.16m.
+Recommended to transform from Portuguese Datum 73 (EPSG:27493) to ETRS89 in Portugal (EPSG:3763).
+
+* D73_ETRS89_geo.gsb
diff --git a/travis/expected_europe.lst b/travis/expected_europe.lst
@@ -1,12 +1,14 @@
 bd72lb72_etrs89lb08.gsb
 CHENyx06a.gsb
 CHENyx06_ETRS.gsb
+D73_ETRS89_geo.gsb
 DK
 DK_bornholm.pol
 DK_bridges.pol
 DK_general.pol
 DK_jutland.pol
 DK_zealand.pol
+DLx_ETRS89_geo.gsb
 dnn.gtx
 dvr90.gtx
 FO