2019-11-21T09:04:24.996Z Level of data Level of data CEOS: Physical information: Data in their original packets, as received from a satellite Raw raw CIMO: Level III (Initial state parameters) are internally consistent datasets, generally in grid-point form obtained from Level II data by applying established initialization procedures. NOTE: Data exchanged internationally are Level II or Level III data. CEOS: Geophysical information. Data or retrieved environmental variables which have been spatially and/or temporally re-sampled (i.e., derived from level 1 or 2 products). Such re-sampling may include averaging and compositing. Level III level3 CIMO: Analogue/digital electric signals. CEOS: Physical information: Reconstructed unprocessed instrument data at full space time resolution with all available supplemental information to be used in subsequent processing (e.g. ephemeris, health and safety) appended. Level 0 level0 CIMO: Level I data (Primary Data): in general, are instrument readings expressed in appropriate physical units, and referred to Earth geographical coordinates. They require conversion to the normal meteorological variables (identified in Part I, Chapter 1). Level I data themselves are in many cases obtained from the processing of electrical signals such as voltages, referred to as raw data. Examples of these data are satellite radiances and water-vapour pressure, positions of constant-level balloons, etc. but not raw telemetry signals. Level I data still require conversion to the meteorological parameters specified in the data requirements. CEOS: Physical information: Unpacked, reformatted level 0 data, with all supplemental information to be used in subsequent processing appended. Optional radiometric and geometric correction applied to produce parameters in physical units. Data generally presented as full time/space resolution. A wide variety of sub level products are possible. Level I level1 None of the codes in the table are applicable in the context of this particular observation. inapplicable inapplicable CEOS: Thematic information. Model output or results from analyses of lower level data (i.e., variables that are not directly measured by the instruments, but are derived from these measurements). Level IV level4 CIMO: Level II data (Meteorological parameters). They may be obtained directly from many kinds of simple instruments, or derived from Level I data. For example, a sensor cannot measure visibility, which is a Level II quantity; instead, sensors measure the extinction coefficient, which is a Level I quantity. NOTE: Data exchanged internationally are Level II or Level III data. CEOS: Geophysical information. Retrieved environmental variables (e.g., ocean wave height, soil moisture, ice concentration) at the same resolution and location as the level 1 source data. Level II level2 2 The value is unknown or missing. unknown unknown