{
  "id": 27067,
  "title": "Red Distribution in 6120_2_2",
  "url": "/competitions/dstl-satellite-imagery-feature-detection/discussion/27067",
  "author_name": "",
  "post_date": "2016-12-29T10:52:55.873Z",
  "votes": null,
  "comment_count": 3,
  "views": 172,
  "content": "<p>I get odd(?) spikes in the intensity distribution for the \"Red\" (first band, 4) channel in 6120_2_2 (\"Traditional\"). Why more intensities of 654 than 653 or 655? It's every eight level, so perhaps I'm reading it wrong? Does anybody see this? The pixels are spatially randomly distributed as shown by red pixels (the green are the other...)</p>",
  "messages": [
    {
      "id": "152978",
      "postDate": "12/29/2016 10:52:55",
      "content": "<p>I get odd(?) spikes in the intensity distribution for the \"Red\" (first band, 4) channel in 6120_2_2 (\"Traditional\"). Why more intensities of 654 than 653 or 655? It's every eight level, so perhaps I'm reading it wrong? Does anybody see this? The pixels are spatially randomly distributed as shown by red pixels (the green are the other...)</p>",
      "rawMarkdown": "I get odd(?) spikes in the intensity distribution for the \"Red\" (first band, 4) channel in 6120_2_2 (\"Traditional\"). Why more intensities of 654 than 653 or 655? It's every eight level, so perhaps I'm reading it wrong? Does anybody see this? The pixels are spatially randomly distributed as shown by red pixels (the green are the other...)",
      "votes": null
    },
    {
      "id": "152988",
      "postDate": "12/29/2016 11:31:02",
      "content": "<p>Hm, looks like salt and pepper noise. I'm not near a computer so I can't look into it.</p>\n\n<p>If it really bothers you, use a median filter. Another source of noise could be due to some range transformations done before the data was uploaded.</p>",
      "rawMarkdown": "Hm, looks like salt and pepper noise. I'm not near a computer so I can't look into it.\r\n\r\nIf it really bothers you, use a median filter. Another source of noise could be due to some range transformations done before the data was uploaded.",
      "votes": null
    },
    {
      "id": "152997",
      "postDate": "12/29/2016 12:18:05",
      "content": "<p>It's probably an artifact of how the true color images were created. They are a fusion of the high resolution panchromatic band + the red, green, and blue bands from the lower resolution multispectral image.   </p>\n\n<p><a href=\"https://en.wikipedia.org/wiki/Pansharpened_image\">https://en.wikipedia.org/wiki/Pansharpened_image</a></p>",
      "rawMarkdown": "It's probably an artifact of how the true color images were created. They are a fusion of the high resolution panchromatic band + the red, green, and blue bands from the lower resolution multispectral image.   \r\n\r\nhttps://en.wikipedia.org/wiki/Pansharpened_image",
      "votes": null
    },
    {
      "id": "153006",
      "postDate": "12/29/2016 13:11:35",
      "content": "<p>Thanks! Makes sense.</p>",
      "rawMarkdown": "Thanks! Makes sense.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 152988,
      "author_name": "visoft",
      "author_url": "",
      "post_date": "12/29/2016 11:31:02",
      "content": "<p>Hm, looks like salt and pepper noise. I'm not near a computer so I can't look into it.</p>\n\n<p>If it really bothers you, use a median filter. Another source of noise could be due to some range transformations done before the data was uploaded.</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 152997,
      "author_name": "shawn775",
      "author_url": "",
      "post_date": "12/29/2016 12:18:05",
      "content": "<p>It's probably an artifact of how the true color images were created. They are a fusion of the high resolution panchromatic band + the red, green, and blue bands from the lower resolution multispectral image.   </p>\n\n<p><a href=\"https://en.wikipedia.org/wiki/Pansharpened_image\">https://en.wikipedia.org/wiki/Pansharpened_image</a></p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 153006,
      "author_name": "glimmung",
      "author_url": "",
      "post_date": "12/29/2016 13:11:35",
      "content": "<p>Thanks! Makes sense.</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "152978": "I get odd(?) spikes in the intensity distribution for the \"Red\" (first band, 4) channel in 6120_2_2 (\"Traditional\"). Why more intensities of 654 than 653 or 655? It's every eight level, so perhaps I'm reading it wrong? Does anybody see this? The pixels are spatially randomly distributed as shown by red pixels (the green are the other...)",
    "152988": "Hm, looks like salt and pepper noise. I'm not near a computer so I can't look into it.\r\n\r\nIf it really bothers you, use a median filter. Another source of noise could be due to some range transformations done before the data was uploaded.",
    "152997": "It's probably an artifact of how the true color images were created. They are a fusion of the high resolution panchromatic band + the red, green, and blue bands from the lower resolution multispectral image.   \r\n\r\nhttps://en.wikipedia.org/wiki/Pansharpened_image",
    "153006": "Thanks! Makes sense."
  },
  "source": "meta"
}