Dataset Title - UK Met Office Satellite Icing Products (Experimental)

Dataset Authors -  Lead : Pete Francis (pete.francis@metoffice.gov.uk)

                   Corresponding : Katie Bennett (katie.bennett@metoffice.gov.uk)

Time of Interest - 20190120T0000Z - 20190309T1200Z

Area of Interest - 35N to 47N, 100.9W to 79.1W

Data Frequency - Every 30mins where data available

Data Spatial Type - PNG image of satellite data

General Dataset Description - Two experimental satellite products are included in this dataset.
                              The images are equi-rectangular projections, 800 pixels south
                              to north, 900 pixels west to east

        LRRK21: Aircraft icing potential

        This daytime-only product displays the icing potential, which indicates some
        measure of both icing probability and icing intensity. Pixels classified as
        cloud-free, as cloudy with Cloud Top Temperature (CTT) > -2 Celsius, or as
        ice clouds with cloud optical thickness < 5.5 are not considered as icing
        potential candidates. Ice clouds with optical thickness > 5.5 are considered as
        indeterminate pixels, because the nature of any clouds below the ice cloud cannot
        be reliably discerned at the present time. In addition, liquid water cloud pixels
        with CTT < -30 Celsius are also classed as being indeterminate. The icing potential
        for the remaining pixels is classified based on the retrieved cloud optical thickness
        and effective radius, and plotted as described in the colour key. No data category
        pixels are where the cloud mask indicates the presence of cloud but a valid retrieval
        of optical thickness / effective radius was not possible.

        LRRK41: Cloud top height (CTH) of likely aircraft icing

        This image type complements the Aircraft Icing Diagnostics product, by providing
        the estimated Cloud Top Height of areas that are discerned to exhibit a risk of icing.
        Areas where the risk is approximately zero are denoted as a solid block of dark grey.
        Areas characterised by ice clouds, where the risk of icing at levels below cannot be
        determined, are shown using the 10.8 micron channel Brightness Temperature.

        IMPORTANT -  Please note there is an issue with the LRRK41 product!
                     When the icing potential (in the LRRK21 product) is equal
                     to “High prob severe”, then unfortunately a valid cloud-top
                     height is NOT plotted on the corresponding LRRK41 image.

                     Upon request small selections of these data can be reproccessed
                     with this issue fixed should they be required for publication.
                     Please contact authors for further details.

File Names - satellite_icing_products.tar.gz
             Inside tarred and zipped file are PNG images formatted
             LRRK{XX}_YYYYmmddHHMM.png

             The following fields are included;

             LRRK21 : Aircraft icing potential
             LRRK41 : Cloud top height (CTH) of likely aircraft icing

Data restrictions - No additional restrictions required

Digital Object Identifier (DOI) - Yes, please generate (N.B. - products are experimental)