WaPOR V2 quality assessment: Technical report on the data quality of the WaPOR FAO database version 2

Food and Agriculture Organization of the United Nations

Food & Agriculture Org., 4 dic 2020 - 89 pagine

This document presents the results of a validation of the version-2 of the WaPOR database, produced by the FRAME consortium partners, eLEAF and VITO. The report summarises the work done by the validation partner (ITC-UTwente) to assess the quality of the new V2 core data components, currently used to estimate and derive agricultural water productivity for Africa and the Near East. WaPOR represents a comprehensive open access data portal that provides information on biomass productivity (with focus on food and agriculture production) and evapotranspiration (evaporative losses and water use) for Africa and the Near East in near real time covering the period from 1 January 2009 to date. WaPOR offers continuous data on a 10-day average basis across Africa and the Near East at three spatial resolutions. The continental level-1 data (250m) cover entire Africa and the Near East (L1). The national level-2 (100m) data cover 21 countries and four river basins (L2). The third level-3 data (30m) cover eight irrigation areas (L3). The quality assessment focused on the core data of the WaPOR database i.e., the evaporative loss components: plant transpiration (T), soil evaporation (E) and interception (I) combined in ETI, the net primary productivity – NPP, the total (TBP) and above ground biomass productivity (AGBP) and reference evapotranspiration – RET.

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Table 11 WaPOR data components and validation methods used in the quality assessment The spatial levels used in the assessment are denoted as L1 ...	1

Table 12 Description of the WaPOR V2 ETIaWPR and NPP WPR data products available on the WaPOR portal	4

Table 14 Description of L3 irrigated scheme areas used in the product evaluation	5

Figure 21 WaPOR database validation process and procedures ref FRAME Methodology reports	6

Figure 22 Approach used for the validation of the ETIa and NPP WaPOR products in Africa and the Near East	7

Table 21 Land Cover Classification and corresponding class numbers as used in the L1 WaPOR Land Cover dataset	10

Table 22 EC flux tower site descriptions and available data for direct insitu validation	12

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Figure 317 Seasonal values of ETIaWPR ETaEC ETalys and applied water for crops at the Egypt EGSAA upper and EGZAN lower sites IRR is irrig...	36

Figure 319 WaPOR ETIa SMC NDVI and fraction of transpiration Tfrac at BNNAL 2009	37

Figure 320 The relationship between monthly mean daily ETIaWPR plotted against monthly mean daily ETaEC Only months with valid daily observ...	38

Figure 321 Time series comparison of 10day averaged dekad NPPWPR solid blue line and NPPEC solid black line for the available period which var...	39

Figure 322 Time series of dekad RETWPR solid blue line and dekad RETEC solid black line for the available period which varies for different sites ...	40

Figure 323 WaPOR derived left and reported right AGBP ton ha per full ratoon cropping period for available plots in the Wonji with SOS and EOS...	42

Figure 324 WaPOR derived left and reported right AGBP in tonha for full ratoon cropping cycle variable per plot ranging from 0828 yrs for availa...	43

08 to 28 years	44

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3 Validation Results	16

Figure 31 Annual basinaveraged ETIaWPRPCP ratios for 22 major river v2basins in Africa for the 10year period 20092018 as derived from Level1...	17

Table 31 Annual PCP and ETIa min and max of major basins derived from the WaPOR database for the period 20092018 compared against availabl...	18

Figure 32 The relationship between longterm average annual ETIaWPR left the ETa MOD16 Near and ETa Fu right plotted against average annual ...	19

Figure 34 Mean annual ETIa and NPP for WaPOR 20092018 and MODIS 20002014	21

Figure 35 WaPOR plotted against MODIS for ETIa left upper and NPP left lower for years 20092014 for major and minor climate classes Mean an...	22

Figure 37 Designation by percent of cropland by climate class	23

Figure 38 Relationship between NPP WPR and ETIaWPR left upper and NPP MOD17 and ETaMOD16 left lower for years 20092014 and the corr...	24

Figure 39 Views of ETIaWPR L1 and ETaMSG on 0110 April 2018 dekad 1810 and 2131 Oct 2018 dekad 1830	25

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Figure 312 Time series AprilDecember 2018 comparison of L1 NPPWaPOR to LSASAF MSGNPP as GPP05 for selected random locations across Af...	28

Table 32 Comparison of ETIa estimates from literature and remote sensing in the Bekaa Valley	29

Figure 313 Times series of ETIaWPR orange line SMC blue line and NDVI green line in tropical wet savanna Aw hot arid desert BWh and subtropic...	30

Figure 314 Times series of climate zone averaged Transpiration orange line NPP grey line and SR blue dashed line in tropical wet savanna Aw hot ari...	31

Figure 315 Annual AGBP plotted against annual ETIaWPR upper and annual AGBP WP plotted against annual AGBP lower for climate zones The ci...	32

Table 33 Statistics comparing ETIaWPR with ETaEC at 14 EC locations	34

Figure 316 Time series comparison of 10day averaged dekad ETIaWPR solid blue line and ETaEC solid black line for all available flux tower data o...	35

Figure 326 NPPWPR plotted against ETIaWPR left and NPPEC plotted against ETaEC right for 5 eddy covariance stations with both latent energy an...	46

Figure 327 NPPWPR plotted against ETIaWPR for 5 EC stations with insitu NPP data left and NPPEC plotted against ETaEC Near for 5 eddy covaria...	47

Figure 328 NPP WPR ETIa WPR NDVI and SMC time series at EG ZAN station 20112013	48

Figure 330 Level consistency between L1 and L2 ETIa and NPP	50

Figure 332 Level consistency of 250m 100m and 30m ETIaWPR resolution against ETIaEC at EGZAN	51

Figure 333 Level consistency of 250m 100m and 30m ETIaWPR resolution against ETIaEC	52

Figure 334 Plot average AGBP WP derived from L1 NPPWPR plotted against plot average AGBP WP derived from L3 NPPWPR for all plots left an...	53

1 line	54

Figure 337 WaPOR V2 NPP ETIa evaporation E transpiration T and SMC plotted against WaPOR V1 NPP ETIa evaporationE transpiration T and S...	55

4 Conclusions and Recommendations	56

Table 41 Summary of the findings and conclusions on the validation of the WaPOR V2 data components and spatial levels	57

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Figure B1 Dekadal SMC for each plot for wheat potato Trends shown are for the earliest plant date SOS of all farmer reported SOS to the last harvest ...	65

Figure B2 Dekadal NDVI for each plot for wheat potato Trends shown are for the earliest plant date SOS of all farmer reported SOS to the last harves...	66

Figure E1 Raw LE flux data and ETIa WPR L1_AET in figure time series for Wankama Nord site of 2012	67

sensible heat H Blue Latent heat LE Red Rnet solar Yellow ground heat flux G0	68

Figure E6 Meteorological and soil moisture and thermal data series at the Wankama site in 2012	69

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Parole e frasi comuni

Africa AGBP WP arid Awash Bekaa Valley bias biomass C4 crops CG-TCH climate classes climate zones compared comparison correlation cropland Cross validation data components datasets dekad EC flux tower Eddy Covariance EG-SAA EG-ZAN estimates ETI a WPR ETI and NPP ETI-WPR ETIa evaluation evapotranspiration farmer reported GH-ANK global hemisphere Hydrological in-situ in-situ data irrigated L1 and L2 L2 ETI L3 area leaf area index Level consistency locations maize Metehara meteorological mm/day mm/year NDVI NDVI quality NE-WAM Nile Delta NPP-EC NPP-MSG NPP-WPR observations overestimated pixel plotted rainfall regions remote sensing RET-EC RET-WPR river basins RMSE savanna SD-DEM season shows shrubland SN-DHR soil evaporation soil moisture sugarcane sugarcane AGBP Table temperature three spatial resolutions ton/ha transpiration trends tropical values vegetation Wankama WaPOR and MODIS WaPOR data WaPOR database WaPOR derived water balance Wonji yield Zankalon ZM-MON

Informazioni bibliografiche

Titolo	WaPOR V2 quality assessment: Technical report on the data quality of the WaPOR FAO database version 2
Autore	Food and Agriculture Organization of the United Nations
Editore	Food & Agriculture Org., 2020
ISBN	9251336547, 9789251336540
Lunghezza	89 pagine

Esporta citazione	BiBTeX EndNote RefMan

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