Class: Sentinel2Aws::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/sentinel2_aws/client.rb

Constant Summary collapse

S3_REGION = 
'eu-central-1'
S3_BUCKET = 
'sentinel-s2-l1c'

Instance Method Summary collapse

Constructor Details

#initialize(akid, secret) ⇒ Client

Returns a new instance of Client.



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# File 'lib/sentinel2_aws/client.rb', line 6

def initialize(akid, secret)
  Aws.config.update({
    credentials: Aws::Credentials.new(akid, secret),
    region: S3_REGION
  })
  @s3_resource = Aws::S3::Resource.new
  @s3_client = Aws::S3::Client.new
  @directory = Dir.mktmpdir
end

Instance Method Details

#download_file(s3_file, folder, filename) ⇒ Object 



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# File 'lib/sentinel2_aws/client.rb', line 99

def download_file(s3_file, folder, filename)
  if @s3_resource.bucket(S3_BUCKET).object(s3_file).exists?
    base_dir = "#{@directory}/#{folder}"
    Dir.mkdir(base_dir) unless File.exists?(base_dir)
    filepath = "#{base_dir}/#{filename}"
    obj = @s3_resource.bucket(S3_BUCKET).object(s3_file)
    obj.get(response_target: filepath)
    return filepath
  else
    return nil
  end
end

#download_tile_data(tile_path, filename, output_path) ⇒ Object 



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# File 'lib/sentinel2_aws/client.rb', line 112

def download_tile_data(tile_path, filename, output_path)
  s3_file = "#{tile_path}/#{filename}"
  if @s3_resource.bucket(S3_BUCKET).object(s3_file).exists?
    filepath = "#{output_path}/#{filename}"
    obj = @s3_resource.bucket(S3_BUCKET).object(s3_file)
    obj.get(response_target: filepath)
    return filepath
  else
    return nil
  end
end

#get_product_info(product) ⇒ Object 



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# File 'lib/sentinel2_aws/client.rb', line 51

def get_product_info(product)
  product_str = product.split('/')
  folder = "#{product_str[1]}_#{product_str[2]}_#{product_str[3]}"
  filepath = download_file(product, folder, "#{product_str[4]}.json")
  unless filepath.nil?
    file = File.read(filepath)
    product_info = Oj.load(file)
    FileUtils.remove_entry(filepath)
    tiles = []
    product_info["tiles"].each do |tile|
      tile_path = tile["path"]
      tile_name = tile_path.gsub("/", "_")
      tile = "#{tile["path"]}/tileInfo.json"
      tile_filepath = download_file(tile, folder, "#{tile_name}.json")
      unless tile_filepath.nil?
        tile_file = File.read(tile_filepath)
        tile_info = Oj.load(tile_file)
        FileUtils.remove_entry(tile_filepath)

        epsg_str = tile_info["tileGeometry"]["crs"]["properties"]["name"].split(':')

        tile_metadata = {
          path: tile_info["path"],
          timestamp: tile_info["timestamp"],
          utm_zone: tile_info["utmZone"],
          latitude_band: tile_info["latitudeBand"],
          grid_square: tile_info["gridSquare"],
          epsg: epsg_str[-1],
          data_coverage_percentage: tile_info["dataCoveragePercentage"],
          cloudy_pixel_percentage: tile_info["cloudyPixelPercentage"]
        }
        tiles << tile_metadata
      end
    end

    metadata = {
      name: product_info["name"],
      id: product_info["id"],
      path: product_info["path"],
      timestamp: product_info["timestamp"],
      datatake_identifier: product_info["datatakeIdentifier"],
      scihub_ingestion: product_info["sciHubIngestion"],
      s3_ingestion: product_info["s3Ingestion"],
      tiles: tiles
    }
  end
end

#get_products(date) ⇒ Object

date format: “YYYY-MM-DD”



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# File 'lib/sentinel2_aws/client.rb', line 27

def get_products(date)
  pdate = parse_date(date)
  unless pdate.nil?
    year, month, day = pdate
    prefix = "products/#{year}/#{month}/#{day}/"
    folder = "#{year}_#{month}_#{day}"
    objects = []

    @s3_client.list_objects(bucket: S3_BUCKET, prefix: prefix).each do |response|
      response.contents.each do |object|
        product_str = object.key.split(prefix)
        product = product_str[1].split('/')
        if product[1] == 'productInfo.json'
          objects << object.key
        end
      end
    end

    return objects
  else
    return []
  end
end

#parse_date(date) ⇒ Object 



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# File 'lib/sentinel2_aws/client.rb', line 16

def parse_date(date)
  y, m, d = date.split('-')
  y, m, d = y.to_i, m.to_i, d.to_i
  if Date.valid_date? y, m, d
    return [y, m, d]
  else
    return nil
  end
end

#remove_directory ⇒ Object 



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# File 'lib/sentinel2_aws/client.rb', line 124

def remove_directory
  FileUtils.remove_dir(@directory)
end