add heading for get files

Author: Andy Barrett

notebooks/SMAP/smap_as_datatree.ipynb

@@ -86,7 +86,7 @@
    "source": [
     "### Import libraries\n",
     "\n",
-    "As with all Python code, we need to import some libraries to read the data, add coordinates and plot "
+    "As with all Python code, we need to import some libraries to read the data, add coordinates and plot the data."
    ]
   },
   {
@@ -112,6 +112,14 @@
     "DATAPATH = Path(\"data/L3_SM_P\")"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "672a11e2-7fef-4ac6-9809-c0ed276bf3ee",
+   "metadata": {},
+   "source": [
+    "### Get a list of HDF5 files in the data directory"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -127,9 +135,9 @@
    "id": "403ba053-0e4e-412d-9513-3dccf4941ec3",
    "metadata": {},
    "source": [
-    "## Load a data file into an `xarray.DataTree` object\n",
+    "### Load a data file into an `xarray.DataTree` object\n",
     "\n",
-    "`xarray.DataTree` objects allow us to work with hierachical data structures and file formats such as HDF5, Zarr and NetCDF4 with groups.  The SMAP level 2 files are hierachical data structures.\n",
+    "`xarray.DataTree` objects allow us to work with hierachical data structures and file formats such as HDF5, Zarr and NetCDF4 with groups.  The SMAP level 3 files are hierachical data structures.\n",
     "\n",
     "We use `xr.open_datatree` to open a SMAP HDF5 file.  We add the `phony_dims=\"sort\"` because data variables in the SMAP files do not have any assigned dimension scales.  `xarray` names dimensions `phony_dim0`, `phony_dim1`, etc."
    ]