From 5888e105a25063889d413ed65a6b694152458348 Mon Sep 17 00:00:00 2001
From: Wei Ji <23487320+weiji14@users.noreply.github.com>
Date: Thu, 20 Jun 2024 21:50:05 +1200
Subject: [PATCH] Only set Conventions = CF-1.7 attribute for NetCDF grid type

Remove hardcoded attribute that was only meant for NetCDF files, so that GeoTIFF files won't have it.
---
 pygmt/datatypes/header.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pygmt/datatypes/header.py b/pygmt/datatypes/header.py
index 04e10ac0c72..ab109521131 100644
--- a/pygmt/datatypes/header.py
+++ b/pygmt/datatypes/header.py
@@ -203,7 +203,8 @@ def data_attrs(self) -> dict[str, Any]:
         Attributes for the data variable from the grid header.
         """
         attrs: dict[str, Any] = {}
-        attrs["Conventions"] = "CF-1.7"
+        if self.type == 18:  # Grid file format: ns = GMT netCDF format
+            attrs["Conventions"] = "CF-1.7"
         attrs["title"] = self.title.decode()
         attrs["history"] = self.command.decode()
         attrs["description"] = self.remark.decode()