update MODIS GPR plot

Author: Andy Barrett

notebooks/SnowEx_ASO_MODIS_Snow/snow_tutorial_rendered.ipynb

@@ -11565,12 +11565,12 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "We define the bounding box of the SnowEx GPR data.  In this case, we transform the SnowEx data to the MODIS coordinate system before clipping.  We could skip this step and pass the SnowEx CRS to `clip` but this creates some missing values in the resulting clipped dataset because the clip region in WGS84 is a parallelagram when viewed in the MODIS Sinusoidal CRS."
+    "We define the bounding box of the SnowEx GPR data in the MODIS coordinate system.  Then we use this `clip_region` to clip the MODIS snow cover."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 75,
+   "execution_count": 44,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -11582,7 +11582,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "_Text explaining MODIS Sinusoidal to be added here_"
+    "Unlike the plot of MODIS data above for the western US, we will use the MODIS Sinusoidal projection for our plot over the GPR region."
    ]
   },
   {