From 961d4d95c732f4fb183de241e23b7243b012db9c Mon Sep 17 00:00:00 2001
From: Gabe Joseph <gjoseph92@gmail.com>
Date: Wed, 6 Apr 2022 15:43:48 -0400
Subject: [PATCH] Better error when forgetting mosaic custom nodata

Inspired by https://github.com/microsoft/PlanetaryComputer/discussions/17#discussioncomment-2517910
---
 stackstac/ops.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/stackstac/ops.py b/stackstac/ops.py
index adc0f4d..502650e 100644
--- a/stackstac/ops.py
+++ b/stackstac/ops.py
@@ -202,7 +202,9 @@ def mosaic(
     if np.isnan(nodata) and arr.dtype.kind in "biu":
         # Try to catch usage errors forgetting to set `nodata=`
         raise ValueError(
-            f"Cannot use {nodata=} when mosaicing a {arr.dtype} array, since {nodata} cannot exist in the array."
+            "You've probably forgotten to pass a custom `nodata=` argument. "
+            f"Cannot use {nodata=} (the default) when mosaicing a {arr.dtype} array, "
+            f"since {nodata} cannot exist in that dtype. "
         )
 
     func = (