SIGRID Conversion

ASSIST Output

{
  "ice": {
    "open_water_lookup_code": null,
    "thick_ice_lookup_code": null,
    "thin_ice_lookup_code": null,
    "total_concentration": 4
  },
  "ice_observations": [
    {
      "biota_lookup_code": null,
      "floe_size_lookup_code": null,
      "ice_lookup_code": null,
      "melt_pond": {
        "freeboard": 15,
        "max_depth_lookup_code": null,
        "pattern_lookup_code": null,
        "surface_coverage": 2,
        "surface_lookup_code": null
      },
      "obs_type": "primary",
      "partial_concentration": 2,
      "sediment_lookup_code": null,
      "snow_lookup_code": null,
      "snow_thickness": null,
      "thickness": 100,
      "topography": {
        "concentration": 2,
        "consolidated": "TRUE",
        "old": true,
        "ridge_height": 1,
        "snow_covered": false,
        "topography_lookup_code": null
      }
    },
    {
      "biota_lookup_code": null,
      "floe_size_lookup_code": null,
      "ice_lookup_code": null,
      "melt_pond": {
        "freeboard": null,
        "max_depth_lookup_code": null,
        "pattern_lookup_code": null,
        "surface_coverage": 0,
        "surface_lookup_code": null
      },
      "obs_type": "secondary",
      "partial_concentration": 2,
      "sediment_lookup_code": null,
      "snow_lookup_code": null,
      "snow_thickness": null,
      "thickness": 70,
      "topography": {
        "concentration": null,
        "consolidated": null,
        "old": null,
        "ridge_height": null,
        "snow_covered": null,
        "topography_lookup_code": null
      }
    },
    {
      "biota_lookup_code": null,
      "floe_size_lookup_code": null,
      "ice_lookup_code": null,
      "melt_pond": {
        "freeboard": null,
        "max_depth_lookup_code": null,
        "pattern_lookup_code": null,
        "surface_coverage": 0,
        "surface_lookup_code": null
      },
      "obs_type": "tertiary",
      "partial_concentration": null,
      "sediment_lookup_code": null,
      "snow_lookup_code": null,
      "snow_thickness": null,
      "thickness": null,
      "topography": {
        "concentration": 4,
        "consolidated": null,
        "old": null,
        "ridge_height": null,
        "snow_covered": null,
        "topography_lookup_code": null
      }
    }
  ],
  "latitude": 71.6414,
  "longitude": -151.0586,
  "meteorology": {
    "clouds": [
      {
        "cloud_lookup_code": null,
        "cloud_type": "high",
        "cover": null,
        "height": null
      },
      {
        "cloud_lookup_code": null,
        "cloud_type": "medium",
        "cover": null,
        "height": null
      },
      {
        "cloud_lookup_code": null,
        "cloud_type": "low",
        "cover": null,
        "height": null
      }
    ],
    "visibility_lookup_code": null,
    "weather_lookup_code": null
  },
  "obs_datetime": "2012-08-08T21:08:00Z",
  "primary_observer": {
    "firstname": "Unknown",
    "lastname": "Observer"
  },
  "uuid": "02bbfd90-dd13-4b72-ae9d-096ab73c5314"
}

SIGIRD Output

{
  "type":"Feature",
  "geometry":{
    "type":"Point",
    "coordinates":[-151.0586,71.6414]
  },
  "properties":{
    "CT":"40",
    "CTA":"20",
    "CTB":"20",
    "CTC":"55",
    "DO":"1",
    "WO":"1",
    "SO":"1",
    "PO":"1",
    "RO":"1",
    "EM":"85",
    "SA":"80",
    "SB":"80",
    "SC":"80",
    "CN":"80",
    "CD":"80"
  }
}

SIGRID Conversion

def ice_concentration(assist_value)
      case assist_value
      when nil
        '55'
      when 0
        '01'
      when 10
        '92'
      else
        (assist_value * 10).to_s
      end
    end
    
    def ice_thickness(observation)
      if observation.ice.total_concentration.nil? or observation.ice.total_concentration == 0
        0
      else
        (
          ice_percent_thickness(observation.ice_observations.primary) + 
          ice_percent_thickness(observation.ice_observations.secondary) + 
          ice_percent_thickness(observation.ice_observations.tertiary)
        ) / observation.ice.total_concentration
      end
    end
    
    def water_coverage_area(observation)
      if observation.ice.total_concentration.nil? or observation.ice.total_concentration == 0
        0
      else
        (
        melt_pond_percent_coverage(observation.ice_observations.primary) +
        melt_pond_percent_coverage(observation.ice_observations.primary) +
        melt_pond_percent_coverage(observation.ice_observations.primary)
        ) / observation.ice.total_concentration
      end
    end
    
    def melt_pond_percent_coverage(ice_observation)
      if ice_observation.partial_concentration.nil? or ice_observation.melt_pond.surface_coverage.nil?
        0
      else
        ice_observation.partial_concentration * ice_observation.melt_pond.surface_coverage
      end
    end
    
    def ice_percent_thickness(ice_observation)
      if ice_observation.partial_concentration.nil?
        0
      else
        ice_observation.partial_concentration * (ice_observation.thickness || 0)
      end
    end
    
    def stage_of_development(ice_type_code, thickness) 
      case ice_type_code
      when 10,11
        '81'
      when 20
        '82'
      when 30
        if thickness != nil and thickness >= 10 and thickness <= 30
          '84'
        elsif thickness != nil and thickness > 30 and thickness <= 70
          '87'
        else
          '80'
        end
      when 40
        '84'
      when 50
        '85'
      when 60
        '87'
      when 70
        '91'
      when 80
        '93'
      when 75
        '96'
      when 85
        '97'
      when 90
        '70'
      when 95
        #TODO: I need a code here
        '80'
      else
        '80'
      end
       
    end