Landsat8_Batch_NDVI_calculate_and_export.ipynb

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  "nbformat_minor": 0,
  "metadata": {
    "colab": {
      "provenance": [],
      "collapsed_sections": []
    },
    "kernelspec": {
      "name": "python3",
      "display_name": "Python 3"
    }
  },
  "cells": [
    {
      "cell_type": "code",
      "metadata": {
        "id": "C-Zvu9iWG2cf",
        "outputId": "36fd97a7-0f64-4260-9101-796f97008c4d",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 188
        }
      },
      "source": [
        "# Installs geemap package\n",
        "import subprocess\n",
        "\n",
        "try:\n",
        "    import geemap\n",
        "except ImportError:\n",
        "    print('geemap package not installed. Installing ...')\n",
        "    subprocess.check_call([\"python\", '-m', 'pip', 'install', 'geemap'])\n",
        "\n",
        "# Checks whether this notebook is running on Google Colab\n",
        "try:\n",
        "    import google.colab\n",
        "    import geemap.eefolium as geemap\n",
        "except:\n",
        "    import geemap\n",
        "\n",
        "# Authenticates and initializes Earth Engine\n",
        "import ee\n",
        "ee.Authenticate()\n",
        "\n",
        "ee.Initialize()"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "geemap package not installed. Installing ...\n",
            "To authorize access needed by Earth Engine, open the following URL in a web browser and follow the instructions. If the web browser does not start automatically, please manually browse the URL below.\n",
            "\n",
            "    https://accounts.google.com/o/oauth2/auth?client_id=517222506229-vsmmajv00ul0bs7p89v5m89qs8eb9359.apps.googleusercontent.com&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fearthengine+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fdevstorage.full_control&redirect_uri=urn%3Aietf%3Awg%3Aoauth%3A2.0%3Aoob&response_type=code&code_challenge=tAMjn0B4np0HQwkqoi1VMczViFrUhlgLzC2f6sN7184&code_challenge_method=S256\n",
            "\n",
            "The authorization workflow will generate a code, which you should paste in the box below. \n",
            "Enter verification code: 4/5gEgjW73MpLrYwzYyEAz3q2HO9Kkg0JcRw3k8M8liwtHOCYqQOjGOIk\n",
            "\n",
            "Successfully saved authorization token.\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "kh70pBcQHNuI",
        "outputId": "f0ccc706-3279-4e3f-8f22-1e2690ee3112",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 1000
        }
      },
      "source": [
        "#tiles = [\"44QLG\", \"44QLE\", \"44QLD\", \"44QKE\", \"44PKC\", \"44QKG\", \"44QKD\", \"44QMF\", \"44QKF\", \"44QME\", \"44QMD\"]\n",
        "##tiles = [\"43QHB\", \"43QHA\", \"43QHV\", \"43QHU\", \"43PHT\", \"43QGB\", \"43QGA\", \"43QGV\", \"43QGU\"]\n",
        "##tiles = [\"50SKH\"]\n",
        "tiles = [\"124034\"]\n",
        "##print(sentinel2_tile_bound)\n",
        "startDate = ee.Date('2017-01-01')\n",
        "endDate = ee.Date('2020-09-27')\n",
        "## function for cloud masking\n",
        "def maskCloudAndShadows(image):\n",
        "  ##create function to mask clouds, cloud shadows, snow\n",
        "  pixel_qa = image.select('pixel_qa');\n",
        "  ##keep clear (0) and water (1) pixels\n",
        "  return image.updateMask(pixel_qa.eq(322));   \n",
        "\n",
        "for tile in tiles:\n",
        "  tile_bound = ee.FeatureCollection('users/saptarshi/Luancheng_box')\n",
        "  region = tile_bound.geometry()\n",
        "  ## Define an example collection.\n",
        "  ##collection = ee.ImageCollection(\"LANDSAT/LC08/C01/T2_TOA\").filterDate(startDate, endDate).filter(ee.Filter.lt('CLOUD_COVER', 30)).filterBounds(region)\n",
        "  #collection = ee.ImageCollection('COPERNICUS/S2_SR').filterDate(startDate, endDate).filter(ee.Filter.lt('CLOUD_COVERAGE_ASSESSMENT', 50)).map(maskCloudAndShadows).filter(ee.Filter.eq('MGRS_TILE', tile))\n",
        "  ##load all Landsat 8 SR image within polygon boundary for last year\n",
        "  collection = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR').filterBounds(region).filterDate(startDate, endDate).map(maskCloudAndShadows)\n",
        "  count = int(collection.size().getInfo())\n",
        "  print(\"Total number of images: {}\".format(count))\n",
        "  for i in range(0, count):\n",
        "      image1 = ee.Image(collection.toList(count).get(i))\n",
        "      dateString = image1.get('system:index').getInfo()\n",
        "      ndvi = image1.normalizedDifference(['B5','B4'])\n",
        "      ndvi2 = ndvi.multiply(10000).toInt16()\n",
        "      #LC08_124034_20170701\n",
        "      name = dateString[:-15] +\"NDVI\" + dateString[-16:-4] + \"-\" + dateString[-4:-2] + \"-\" + dateString[-2:] # set the output image filename\n",
        "      #print(name)\n",
        "      # Set configration parameters for output image\n",
        "      task_config = {\n",
        "      ##'folder': 'Sentinel2-NDVI_data', # output Google Drive folder\n",
        "      'region': region,     # roi \n",
        "      'scale': 30,       # image resolution\n",
        "      'crs': 'EPSG:4326',\n",
        "      'maxPixels': 1.0E13,\n",
        "      'fileFormat': 'GeoTIFF'\n",
        "      }\n",
        "     \n",
        "      task = ee.batch.Export.image(ndvi2.clip(region), name, task_config)\n",
        "      task.start()\n",
        "      print (name + \" is exported\")\n",
        "  print(\"Process over for tile no: \" + tile)"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "Total number of images: 69\n",
            "LC08_NDVI_124034_2017-01-22 is exported\n",
            "LC08_NDVI_124034_2017-02-07 is exported\n",
            "LC08_NDVI_124034_2017-02-23 is exported\n",
            "LC08_NDVI_124034_2017-03-11 is exported\n",
            "LC08_NDVI_124034_2017-03-27 is exported\n",
            "LC08_NDVI_124034_2017-04-12 is exported\n",
            "LC08_NDVI_124034_2017-04-28 is exported\n",
            "LC08_NDVI_124034_2017-05-14 is exported\n",
            "LC08_NDVI_124034_2017-05-30 is exported\n",
            "LC08_NDVI_124034_2017-06-15 is exported\n",
            "LC08_NDVI_124034_2017-07-01 is exported\n",
            "LC08_NDVI_124034_2017-07-17 is exported\n",
            "LC08_NDVI_124034_2017-09-19 is exported\n",
            "LC08_NDVI_124034_2017-10-05 is exported\n",
            "LC08_NDVI_124034_2017-10-21 is exported\n",
            "LC08_NDVI_124034_2017-11-06 is exported\n",
            "LC08_NDVI_124034_2017-11-22 is exported\n",
            "LC08_NDVI_124034_2017-12-08 is exported\n",
            "LC08_NDVI_124034_2017-12-24 is exported\n",
            "LC08_NDVI_124034_2018-01-09 is exported\n",
            "LC08_NDVI_124034_2018-01-25 is exported\n",
            "LC08_NDVI_124034_2018-02-10 is exported\n",
            "LC08_NDVI_124034_2018-02-26 is exported\n",
            "LC08_NDVI_124034_2018-03-14 is exported\n",
            "LC08_NDVI_124034_2018-03-30 is exported\n",
            "LC08_NDVI_124034_2018-04-15 is exported\n",
            "LC08_NDVI_124034_2018-05-01 is exported\n",
            "LC08_NDVI_124034_2018-06-02 is exported\n",
            "LC08_NDVI_124034_2018-06-18 is exported\n",
            "LC08_NDVI_124034_2018-07-20 is exported\n",
            "LC08_NDVI_124034_2018-08-21 is exported\n",
            "LC08_NDVI_124034_2018-09-06 is exported\n",
            "LC08_NDVI_124034_2018-09-22 is exported\n",
            "LC08_NDVI_124034_2018-10-08 is exported\n",
            "LC08_NDVI_124034_2018-10-24 is exported\n",
            "LC08_NDVI_124034_2018-11-09 is exported\n",
            "LC08_NDVI_124034_2018-11-25 is exported\n",
            "LC08_NDVI_124034_2018-12-11 is exported\n",
            "LC08_NDVI_124034_2018-12-27 is exported\n",
            "LC08_NDVI_124034_2019-01-12 is exported\n",
            "LC08_NDVI_124034_2019-01-28 is exported\n",
            "LC08_NDVI_124034_2019-03-01 is exported\n",
            "LC08_NDVI_124034_2019-03-17 is exported\n",
            "LC08_NDVI_124034_2019-04-02 is exported\n",
            "LC08_NDVI_124034_2019-04-18 is exported\n",
            "LC08_NDVI_124034_2019-05-04 is exported\n",
            "LC08_NDVI_124034_2019-05-20 is exported\n",
            "LC08_NDVI_124034_2019-06-21 is exported\n",
            "LC08_NDVI_124034_2019-07-07 is exported\n",
            "LC08_NDVI_124034_2019-07-23 is exported\n",
            "LC08_NDVI_124034_2019-08-08 is exported\n",
            "LC08_NDVI_124034_2019-09-09 is exported\n",
            "LC08_NDVI_124034_2019-09-25 is exported\n",
            "LC08_NDVI_124034_2019-10-11 is exported\n",
            "LC08_NDVI_124034_2019-10-27 is exported\n",
            "LC08_NDVI_124034_2019-11-12 is exported\n",
            "LC08_NDVI_124034_2019-11-28 is exported\n",
            "LC08_NDVI_124034_2019-12-30 is exported\n",
            "LC08_NDVI_124034_2020-01-15 is exported\n",
            "LC08_NDVI_124034_2020-01-31 is exported\n",
            "LC08_NDVI_124034_2020-02-16 is exported\n",
            "LC08_NDVI_124034_2020-03-03 is exported\n",
            "LC08_NDVI_124034_2020-03-19 is exported\n",
            "LC08_NDVI_124034_2020-04-04 is exported\n",
            "LC08_NDVI_124034_2020-04-20 is exported\n",
            "LC08_NDVI_124034_2020-05-06 is exported\n",
            "LC08_NDVI_124034_2020-05-22 is exported\n",
            "LC08_NDVI_124034_2020-06-07 is exported\n",
            "LC08_NDVI_124034_2020-08-10 is exported\n",
            "Process over for tile no: 124034\n"
          ],
          "name": "stdout"
        }
      ]
    }
  ]
}