Algorithm Theoretical Based Document (ATBD) - CESBIO

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SO-TN-ESL-SM-GS-0001 Issue 1.a Date: 31/08/2006 SMOS level 2 processor Soil moisture <strong>ATBD</strong> 3.2.2.2.1 Static auxiliary data Table 11: Overview of TGRD precomputed tables Section Table Name Description Source Sampling Requirements Time Samp ling Generation Method Notes 3.1.1. 1 3.1.1. 2 WEF MEAN_WEF Array of weights to apply to every DFFG to compute Mean ESL fractions and reference values Array of weights to apply to every DFFG to compute any kind of fractions and reference ESL values for decision tree and forward models Distance in ρ Earth < 1-E-2 Distance in ρ DC < 1-E-5 None Analytical methods None Analytical methods Series of Rho_Earth dependant 1D vectors. Used at DFFG scale. Series of Rho_DC dependant 1D vectors. Used at DFFG scale. 3.1.2. 1 SKY_ RADIATION Galactic radiation sources TB contribution L1, External fixed data < synthetic antenna pattern None width (≈ 2.2°) Build from available (0.5°) data Used at both DGG and DFFG scales. 3.1.3. 1 3.1.3. 2 3.1.3. 3 3.1.3. 4 3.1.3. 5 DFFG_INFO DFFG_XYZ DFFG_SOIL_ PROPERTIES LAND_COVER _CLASSES DFFG_LAI_M AX Provides detailed information for each DFFG cell, including fraction percentage, landcover class code of fraction Provides X, Y, Z Earth reference coordinates in the Earth fixed frame for each DFFG cell Fractions of clay and sand, information on soil bulk density, and soil temperature vertical interpolation parameters DFFG Landcover Class Code/ecosystems classes along with soil and vegetation properties Max annual LAI ESL N/A None Generated based on ECOCLIMAP, Water Fraction, topography index, and other sources ESL N/A None Geographical coordinates conversion Food Agriculture Organization (FAO), included in ECOCLIMAP package. ISLSCP II ECOCLIMAP ESL ECOCLIMAP phenology or ESL source 5’ × 5’ Flexible None None Flexible 10 days Resample from 1° x 1° maps to 5’ × 5’ File or table directly provided by ESL File or table directly provided by ESL Further changes pending on ESL. Should go to TGRD DPM will use it at DFFG scale but with online mapping. At DFFG scale At DFFG scale. 3.1.4. 1 3.1.4. 2 DGG_INDEX DGG_XYZ SMOS DGG nodes, including index information, latitude, longitude and altitude SMOS DGG node indexes to Earth reference coordinate (X,Y,Z) ESA from SMOS Level 1 SMOS L1 Auxiliary File ISEA4-9, 15 km on average ISEA4-9, 15 km on average None Generated by Level 1 phase None Geographical coordinates conversion Limited to land surfaces and coastal margins At DGG scale 3.1.5. 1 The pre-computable DGG_DEFAUL MEAN_WEF fractions of ESL T_FRACTIONS decision tree classes all around the earth DGG ISEA4-9, 15 km on average None At DGG scale Pre-computed fractions can be used in absence of non permanent cover types. 3.2.2.2.2 Time varying auxiliary data Table 12: Overview of TGRD time updated tables Sec-tion Table Name Description Source 3.2.1 ECMWF_FO RECAST All SM+OS ECMWF products Samplin g Require ments Tempor al Samplin g Generation Method Tables Used at Both DFFG and DGG Scales ESA/EC MWF 0.225º × 0.225° 3 hours Direct read Quality Check ECMWF docs Use and Notes For surface & atmospheric models, and flags. Content is used both at . 67
SO-TN-ESL-SM-GS-0001 Issue 1.a Date: 31/08/2006 SMOS level 2 processor Soil moisture <strong>ATBD</strong> Sec-tion Table Name Description Source 3.2.2.1 DFFG_LAI Leaf Area Index 3.2.2.2 3.2.3.1 3.2.3.2 DFFG_SSMI_ BT DGG_CURRE NT_TAU_NA DIR_LV DGG_CURRE NT_TAU_NA DIR_FO 3.2.3.2.4 DFFG_CURR ENT_FLOOD 3.2.3.3 3.2.3.4 DGG_CURRE NT_ROUGH NESS_H DGG_CURRE NT_RFI Flag for dominant presence of wet snow TBC Samplin g Require ments MODIS MOD15 Flexible SSM/I 37 GHz TBC Every non-missing value is used as the Tau_Nadir_LV reference value for SMOS retrieval for Low L2 Vegetation (LV) fractions (FNO, FWL) of every DGG. Every non-missing value is used as the Tau_Nadir_FO SMOS reference value for forest L2 fraction FFO. Aerea where flodd may occur Every non-missing value is used as the roughness parameter HR reference value for retrieval. RFI flags SMOS L2 SMOS L2 SMOS L1/L2 25 km TBC or Flexible Tempor al Samplin g DFFG Tables Weekly or 10 days Generation Method When the new MODIS product is available, fill its missing LAI values from the previous product. The first-time missing LAIs are filled with phenology. Quality Check N/A Daily Resample to DFFG TBD DGG Currents Tables ISEA4-9 Every day ISEA4-9 Every 4 weeks ISEA4-9 Every 4 weeks ISEA4-9 Every 4 weeks ISEA4-9 Every day When SML2P retrieval of Tau_Nad_LV is possible and accurate, post-processing will update this table with the retrieved values. When SML2P retrieval of Tau_Nadir_FO is possible and accurate, post-processing will update this table with the retrieved values. When area is flooded after high rains and according to channelling, the post-processing will update this table When SML2P retrieval of the roughness parameter HR is possible and accurate, then postprocessing will update this table with the retrieved values. Prior knowledge? + When SML2P post-processing diagnostic analysis suspects RFI Use and Notes DFFG & DGG scale and by online mapping in DPM. Generated at DFFG scale Generated at DFFG scale Place holder for future use Ground truth, time At DGG scale consistenc y Ground truth, time At DGG scale consistenc y Ground truth, time At DGG scale consistenc y Ground truth, time At DGG scale consistenc y Ground truth, time At DGG scale consistenc y 3.2.2.2.3 Auxiliary Users Parameters File Table 13: Overview of TGRD user parameters tables Section Table Name Description Source 3.3.1 USER_PARAMET ERS True constants that will not change during SMOS mission Sampling Requirements ESL na. × 3.2.2.3 Auxiliary data pre-processing Temporal sampling Generation Method File or table directly provided by ESL. Notes This consists of checking auxiliary surface data and interpolating them on a reference grid centred on each L1c node of the SMOS fixed grid, in order to compute fractions through applying the weighting function. Also topography data acquisition and pre-processing will be useful as it will be done once. It is probable that the land sea mask will also be processed only once. 3.2.2.3.1 Auxiliary data check It will also be presumably necessary to address the validity of the auxiliary data and thus both ranges and mainly availability will have to be checked. . 68
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