Fixed wring stretching of GeoArray.show() in case image contains np.nan.

geoarray/baseclasses.py

@@ -991,10 +991,11 @@ class GeoArray(object):
         palette = cmap if cmap else plt.cm.gray
         if nodataVal is not None and np.std(image2plot) != 0:  # do not show nodata
             image2plot = np.ma.masked_equal(image2plot, nodataVal)
-            vmin_auto, vmax_auto = np.percentile(image2plot.compressed(), 2), np.percentile(image2plot.compressed(), 98)
+            vmin_auto, vmax_auto = \
+                np.nanpercentile(image2plot.compressed(), 2), np.nanpercentile(image2plot.compressed(), 98)
             palette.set_bad('aqua', 0)
         else:
-            vmin_auto, vmax_auto = np.percentile(image2plot, 2), np.percentile(image2plot, 98)
+            vmin_auto, vmax_auto = np.nanpercentile(image2plot, 2), np.percentile(image2plot, 98)
 
         vmin = vmin if vmin is not None else vmin_auto
         vmax = vmax if vmax is not None else vmax_auto