Addressing latest comments in issue #9

Author: ldesousa

workshop/jupyter/content/notebooks/03-spatial-reference-systems.ipynb

@@ -13,10 +13,10 @@
     " 2. accurately portray spatial objects in maps. \n",
     "\n",
     "In its most basic form a SRS is composed by two elements:\n",
-    " 1. *Datum* - a sphere or ellipsoid that approximates the shape of the Earth, positioned relative to the later. \n",
+    " 1. *Datum* - a sphere or ellipsoid that approximates the shape of the Earth, positioned relative to the latter. \n",
     " 2. *Cartographic Projection* - a set of mathematical functions that translate locations in the surface of the *datum* into the Cartesian plane.\n",
     " \n",
-    "The WGS84 is standard *datum* issued by the World Geodetic Survey that is in wide use today. Most GPS or GNSS receivers today report geographic coordinates (e.g. longitude and latitude) in reference to this *datum*. For global cartography the WGS84 is an obvious choice, but for local mapping a bespoke *datum* can be more suitable. Most national surveys have defined *data* that suit appropriately their country or region.\n",
+    "The WGS84 is the standard *datum* issued by the World Geodetic Survey that is in wide use today. Most GPS or GNSS receivers today report geographic coordinates (e.g. longitude and latitude) in reference to this *datum*. For global cartography the WGS84 is an obvious choice, but for local mapping a bespoke *datum* can be more suitable. Most national surveys have defined *data* that suit appropriately their country or region.\n",
     "\n",
     "![Geodesic Datum](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b2/Gloabl_and_Regional_Ellipsoids.svg/640px-Gloabl_and_Regional_Ellipsoids.svg.png)\n",
     "*Sketch of geodesic data positioned relative to the Earth's surface. Source: [Wikipaedia](https://en.wikipedia.org/wiki/Geodetic_datum).* \n",
@@ -163,6 +163,8 @@
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+    "The third value in the output is height, a standard output of the `TransformPoint` method. This method can also take height as a third input.\n",
+    "\n",
     "Question: the central point of the European system is in Potsdam, which lies at a latitude of 52º N. Why are none of the coordinates outputed above negative?\n",
     "\n",
     "### Working with geometries\n",
@@ -313,8 +315,8 @@
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