From f467032cd386911afb5bdc4931fe4bd4bf3cca45 Mon Sep 17 00:00:00 2001
From: Ole Nielsen <Ole.Moller.Nielsen@gmail.com>
Date: Sun, 14 Aug 2011 19:53:40 +0700
Subject: [PATCH] Wrapped interpolation function in try-except to provide
 better error message than that mentioned in issue #19

---
 impact/engine/interpolation.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/impact/engine/interpolation.py b/impact/engine/interpolation.py
index 47b36e5..02d8b7e 100644
--- a/impact/engine/interpolation.py
+++ b/impact/engine/interpolation.py
@@ -34,7 +34,11 @@ def raster_spline(longitudes, latitudes, values):
     A = numpy.flipud(values)
 
     # Call underlying spline
-    F = RectBivariateSpline(latitudes, longitudes, A)
+    try:
+        F = RectBivariateSpline(latitudes, longitudes, A)
+    except:
+        msg = 'Interpolation failed. Please zoom out a bit and try again'
+        raise Exception(msg)
 
     # Return interpolator
     return Interpolator(F, longitudes, latitudes)