Google Location History takeout

e7.ipynb

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   "source": [
    "# Google's location history takeout data\n",
    "\n",
    "Currently downloads are returning something like:\n",
    "\n",
    "  {\n",
    "    [...]\n",
    "    \"latitudeE7\" :  4010772801,\n",
    "    \"longitudeE7\" : 1454104378,\n",
    "    [...]\n",
    "   }\n",
    "   \n",
    " In particular you're supposed to divide by 1e7:"
   ]
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   "cell_type": "code",
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   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "401.0772801"
      ]
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     "execution_count": 1,
     "metadata": {},
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   ],
   "source": [
    "4010772801 / 1e7"
   ]
  },
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   "cell_type": "markdown",
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   "source": [
    "Not quite.\n",
    "\n",
    "After wondering if this was some special coordinate system but everyone on the internet just saying the \"E7\" was the clue I decided it was broken. \n",
    "\n",
    "It turns out they're returning signed values as unsigned..."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[-284194495, 1454104378]"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "x = [4010772801, 1454104378].pack(\"LL\").unpack(\"ll\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[-28.4194495, 145.4104378]"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "(lat, lon) = x.map { |x| x / 1e7 }"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "https://www.openstreetmap.org/#map=9/-28.4194495/145.4104378"
     ]
    }
   ],
   "source": [
    "print \"https://www.openstreetmap.org/#map=5/\" + lat.to_s + \"/\" + lon.to_s"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
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   "source": []
  }
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