{
  "id": 240437,
  "title": "Ground truth",
  "url": "/competitions/google-smartphone-decimeter-challenge/discussion/240437",
  "author_name": "",
  "post_date": "2021-05-19T19:20:26.974014300Z",
  "votes": 3,
  "comment_count": 2,
  "views": 0,
  "content": "<p>Do I get it right that those files werent obtained directly from GNSS logs?</p>\n<p>For example ground_truth files contain speedMps column, while Fix section of the logs, which in theory should contain this sort of a data, is empty. Or am I missing something?</p>",
  "messages": [
    {
      "id": "1315426",
      "postDate": "05/19/2021 19:20:26",
      "content": "<p>Do I get it right that those files werent obtained directly from GNSS logs?</p>\n<p>For example ground_truth files contain speedMps column, while Fix section of the logs, which in theory should contain this sort of a data, is empty. Or am I missing something?</p>",
      "rawMarkdown": "Do I get it right that those files werent obtained directly from GNSS logs?\n\nFor example ground_truth files contain speedMps column, while Fix section of the logs, which in theory should contain this sort of a data, is empty. Or am I missing something?",
      "votes": null
    },
    {
      "id": "1315447",
      "postDate": "05/19/2021 19:42:22",
      "content": "<p>The GNSS logs are from the phones, while the ground truth is from a much larger GPS antenna. You can see more details <a href=\"https://www.kaggle.com/google/android-smartphones-high-accuracy-datasets?select=ION+GNSS+2020+Android+Raw+GNSS+Measurement+Datasets+for+Precise+Positioning.pdf\" target=\"_blank\">in this paper</a> referenced in the data description.</p>",
      "rawMarkdown": "The GNSS logs are from the phones, while the ground truth is from a much larger GPS antenna. You can see more details [in this paper](https://www.kaggle.com/google/android-smartphones-high-accuracy-datasets?select=ION+GNSS+2020+Android+Raw+GNSS+Measurement+Datasets+for+Precise+Positioning.pdf) referenced in the data description.",
      "votes": null
    },
    {
      "id": "1315472",
      "postDate": "05/19/2021 20:22:18",
      "content": "<p>There is also a video 1/2 way down this page: <a href=\"https://www.kaggle.com/nayuts/let-s-visualize-dataset-to-understand\" target=\"_blank\">https://www.kaggle.com/nayuts/let-s-visualize-dataset-to-understand</a> where you can see how they collected the ground truth by putting the giant antenna in the back seat of the car (where the phones were on the dashboard)</p>\n<p>[edit]: ah, the video is at the paper link linked above as well</p>",
      "rawMarkdown": "There is also a video 1/2 way down this page: https://www.kaggle.com/nayuts/let-s-visualize-dataset-to-understand where you can see how they collected the ground truth by putting the giant antenna in the back seat of the car (where the phones were on the dashboard)\n\n[edit]: ah, the video is at the paper link linked above as well",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 1315447,
      "author_name": "sohier",
      "author_url": "",
      "post_date": "05/19/2021 19:42:22",
      "content": "<p>The GNSS logs are from the phones, while the ground truth is from a much larger GPS antenna. You can see more details <a href=\"https://www.kaggle.com/google/android-smartphones-high-accuracy-datasets?select=ION+GNSS+2020+Android+Raw+GNSS+Measurement+Datasets+for+Precise+Positioning.pdf\" target=\"_blank\">in this paper</a> referenced in the data description.</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 1315472,
      "author_name": "chris62",
      "author_url": "",
      "post_date": "05/19/2021 20:22:18",
      "content": "<p>There is also a video 1/2 way down this page: <a href=\"https://www.kaggle.com/nayuts/let-s-visualize-dataset-to-understand\" target=\"_blank\">https://www.kaggle.com/nayuts/let-s-visualize-dataset-to-understand</a> where you can see how they collected the ground truth by putting the giant antenna in the back seat of the car (where the phones were on the dashboard)</p>\n<p>[edit]: ah, the video is at the paper link linked above as well</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "1315426": "Do I get it right that those files werent obtained directly from GNSS logs?\n\nFor example ground_truth files contain speedMps column, while Fix section of the logs, which in theory should contain this sort of a data, is empty. Or am I missing something?",
    "1315447": "The GNSS logs are from the phones, while the ground truth is from a much larger GPS antenna. You can see more details [in this paper](https://www.kaggle.com/google/android-smartphones-high-accuracy-datasets?select=ION+GNSS+2020+Android+Raw+GNSS+Measurement+Datasets+for+Precise+Positioning.pdf) referenced in the data description.",
    "1315472": "There is also a video 1/2 way down this page: https://www.kaggle.com/nayuts/let-s-visualize-dataset-to-understand where you can see how they collected the ground truth by putting the giant antenna in the back seat of the car (where the phones were on the dashboard)\n\n[edit]: ah, the video is at the paper link linked above as well"
  },
  "source": "meta"
}