{
  "id": 334964,
  "title": "How is the ground truth table created ? and What is the accuracy of it?",
  "url": "/competitions/smartphone-decimeter-2022/discussion/334964",
  "author_name": "envylustpride",
  "post_date": "2022-07-04T04:07:55.086000",
  "votes": 4,
  "comment_count": 3,
  "views": 0,
  "content": "<p>What device was used to calculate the ground truth ?<br>\nHow is the ground truth calculated ? <br>\nWhat is the accuracy of ground truth ?</p>",
  "messages": [
    {
      "id": 1843031,
      "postDate": "2022-07-04T13:48:13.393Z",
      "content": "<p>Details of the dataset collection can be found in the following paper.</p>\n<pre><code>Fu, Guoyu (Michael), Khider, Mohammed, van Diggelen, Frank, \"Android Raw GNSS Measurement Datasets for Precise Positioning,\" Proceedings of the 33rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2020), September 2020, pp. 1925-1937.\nhttps://doi.org/10.33012/2020.17628\n</code></pre>\n<p>This paper is available <a href=\"https://www.kaggle.com/datasets/google/android-smartphones-high-accuracy-datasets\" target=\"_blank\">here</a>. </p>\n<p>According to this paper, <a href=\"https://novatel.com/products/gnss-inertial-navigation-systems\" target=\"_blank\">NovAtel SPAN</a>, a GNSS/INS navigation system, is used to obtain ground truth. The accuracy depends on the grade of the IMU but should usually be a few centimeters to 10 centimeters (unless in a tunnel, etc.).</p>",
      "rawMarkdown": "Details of the dataset collection can be found in the following paper.\n\n```\nFu, Guoyu (Michael), Khider, Mohammed, van Diggelen, Frank, \"Android Raw GNSS Measurement Datasets for Precise Positioning,\" Proceedings of the 33rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2020), September 2020, pp. 1925-1937.\nhttps://doi.org/10.33012/2020.17628\n```\n\nThis paper is available [here](https://www.kaggle.com/datasets/google/android-smartphones-high-accuracy-datasets). \n\nAccording to this paper, [NovAtel SPAN](https://novatel.com/products/gnss-inertial-navigation-systems), a GNSS/INS navigation system, is used to obtain ground truth. The accuracy depends on the grade of the IMU but should usually be a few centimeters to 10 centimeters (unless in a tunnel, etc.).\n",
      "votes": 6
    },
    {
      "id": 1842484,
      "postDate": "2022-07-04T04:07:55.087Z",
      "content": "<p>What device was used to calculate the ground truth ?<br>\nHow is the ground truth calculated ? <br>\nWhat is the accuracy of ground truth ?</p>",
      "rawMarkdown": "What device was used to calculate the ground truth ?\nHow is the ground truth calculated ? \nWhat is the accuracy of ground truth ?\n",
      "votes": 4
    },
    {
      "id": 1843630,
      "postDate": "2022-07-05T03:58:14.527Z",
      "content": "<p>Thank you so much Taro for the information. I will check out the paper</p>",
      "rawMarkdown": "Thank you so much Taro for the information. I will check out the paper"
    },
    {
      "id": 1843490,
      "postDate": "2022-07-04T23:34:58.300Z",
      "rawMarkdown": "",
      "isDeleted": true
    }
  ],
  "comments": [
    {
      "id": 1843031,
      "author_name": "Taro",
      "author_url": "",
      "post_date": "2022-07-04T13:48:13.393000",
      "content": "<p>Details of the dataset collection can be found in the following paper.</p>\n<pre><code>Fu, Guoyu (Michael), Khider, Mohammed, van Diggelen, Frank, \"Android Raw GNSS Measurement Datasets for Precise Positioning,\" Proceedings of the 33rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2020), September 2020, pp. 1925-1937.\nhttps://doi.org/10.33012/2020.17628\n</code></pre>\n<p>This paper is available <a href=\"https://www.kaggle.com/datasets/google/android-smartphones-high-accuracy-datasets\" target=\"_blank\">here</a>. </p>\n<p>According to this paper, <a href=\"https://novatel.com/products/gnss-inertial-navigation-systems\" target=\"_blank\">NovAtel SPAN</a>, a GNSS/INS navigation system, is used to obtain ground truth. The accuracy depends on the grade of the IMU but should usually be a few centimeters to 10 centimeters (unless in a tunnel, etc.).</p>",
      "votes": 6,
      "replies": []
    },
    {
      "id": 1843630,
      "author_name": "envylustpride",
      "author_url": "",
      "post_date": "2022-07-05T03:58:14.527000",
      "content": "<p>Thank you so much Taro for the information. I will check out the paper</p>",
      "votes": 0,
      "replies": []
    },
    {
      "id": 1843490,
      "author_name": "",
      "author_url": "",
      "post_date": "2022-07-04T23:34:58.300000",
      "content": "",
      "votes": 0,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "1843031": "Details of the dataset collection can be found in the following paper.\n\n```\nFu, Guoyu (Michael), Khider, Mohammed, van Diggelen, Frank, \"Android Raw GNSS Measurement Datasets for Precise Positioning,\" Proceedings of the 33rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2020), September 2020, pp. 1925-1937.\nhttps://doi.org/10.33012/2020.17628\n```\n\nThis paper is available [here](https://www.kaggle.com/datasets/google/android-smartphones-high-accuracy-datasets). \n\nAccording to this paper, [NovAtel SPAN](https://novatel.com/products/gnss-inertial-navigation-systems), a GNSS/INS navigation system, is used to obtain ground truth. The accuracy depends on the grade of the IMU but should usually be a few centimeters to 10 centimeters (unless in a tunnel, etc.).\n",
    "1842484": "What device was used to calculate the ground truth ?\nHow is the ground truth calculated ? \nWhat is the accuracy of ground truth ?\n",
    "1843630": "Thank you so much Taro for the information. I will check out the paper",
    "1843490": ""
  }
}