diff --git a/vocab/quantitykinds/VOCAB_QUDT-QUANTITY-KINDS-ALL-v2.1.ttl b/vocab/quantitykinds/VOCAB_QUDT-QUANTITY-KINDS-ALL-v2.1.ttl
index c1549d77..c9c866e9 100644
--- a/vocab/quantitykinds/VOCAB_QUDT-QUANTITY-KINDS-ALL-v2.1.ttl
+++ b/vocab/quantitykinds/VOCAB_QUDT-QUANTITY-KINDS-ALL-v2.1.ttl
@@ -29217,3 +29217,17 @@ vaem:GMD_QUDT-QUANTITY-KINDS-ALL
   rdfs:isDefinedBy <http://qudt.org/2.1/vocab/quantitykind> ;
   rdfs:label "QUDT Quantity Kind Vocabulary Metadata Version 2.1.43" ;
 .
+quantitykind:ElevationRelativeToNAP a qudt:QuantityKind ;
+    rdfs:label "Elevation relative to NAP"@en, "Hoogte ten opzichte van NAP"@nl ;
+    skos:prefLabel "Elevation relative to NAP"@en, "Hoogte ten opzichte van NAP"@nl ;
+    rdfs:comment "Height measurement relative to the Normaal Amsterdams Peil (NAP) (en: Amsterdam Ordnance System). Being a form of gravity related height" ;
+    qudt:plainTextDescription "Height measurement relative to the Normaal Amsterdams Peil (NAP) (en: Amsterdam Ordnance System). Being a form of gravity related height" ;
+    rdfs:isDefinedBy <http://qudt.org/2.1/vocab/quantitykind> ;
+    skos:broader quantitykind:Altitude;
+    qudt:referenceFrame example:NAP ;
+    qudt:applicableUnit unit:M ;
+    qudt:hasDimensionVector qkdv:A0E0L0I0M0H0T0D0 ; #I'm not sure for this one. 
+    qudt:symbol "mNAP" ;
+    prov:wasDerivedFrom <https://www.opengis.net/def/crs/EPSG/0/5709> ;
+    prov:wasInfluencedBy <https://epsg.io/5709> ;
+.