[geofence] reduce the prefix geofence to 20km resolution, cut out much of the southern hemisphere

sim/geofence/geofence_lib.ipynb

@@ -32,7 +32,7 @@
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 11
+     "prompt_number": 2
     },
     {
      "cell_type": "markdown",
@@ -57,7 +57,7 @@
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 12
+     "prompt_number": 3
     },
     {
      "cell_type": "markdown",
@@ -107,7 +107,7 @@
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 18
+     "prompt_number": 4
     },
     {
      "cell_type": "markdown",
@@ -132,7 +132,7 @@
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 14
+     "prompt_number": 5
     },
     {
      "cell_type": "markdown",
@@ -193,7 +193,39 @@
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 15
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Cut below latitude"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Cuts out points below latitude\n",
+      "def cut_below_latitude(outlines, threashold):\n",
+      "    new_outlines = []\n",
+      "    \n",
+      "    for outline in outlines:\n",
+      "        \n",
+      "        new_outline = []      \n",
+      "        for point in outline:\n",
+      "            if point[1] > threashold:\n",
+      "                new_outline.append(point)\n",
+      "            \n",
+      "        if len(new_outline):\n",
+      "            new_outlines.append(new_outline)\n",
+      "\n",
+      "    return new_outlines"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 7
     },
     {
      "cell_type": "markdown",
@@ -298,7 +330,7 @@
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 16
+     "prompt_number": 8
     },
     {
      "cell_type": "code",
@@ -307,7 +339,7 @@
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 16
+     "prompt_number": 8
     }
    ],
    "metadata": {}