Aschonitis, Vassilis G; Papamichail, Dimitris; Demertzi, Kleoniki; Colombani, Nicolo; Mastrocicco, Micol; Ghirardini, Andrea; Castaldelli, Giuseppe; Fano, Elisa-Anna (2017): High resolution global grids of revised Priestley-Taylor and Hargreaves-Samani coefficients for assessing ASCE-standardized reference crop evapotranspiration and solar radiation, links to ESRI-grid files [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.868808, Supplement to: Aschonitis, VG et al. (2017): High-resolution global grids of revised Priestley-Taylor and Hargreaves-Samani coefficients for assessing ASCE-standardized reference crop evapotranspiration and solar radiation. Earth System Science Data, 9(2), 615-638, https://doi.org/10.5194/essd-9-615-2017
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Abstract:
The objective of the study is to provide global grids (0.5°) of revised annual coefficients for the Priestley-Taylor (P-T) and Hargreaves-Samani (H-S) evapotranspiration methods after calibration based on the ASCE (American Society of Civil Engineers)-standardized Penman-Monteith method (the ASCE method includes two reference crops: short-clipped grass and tall alfalfa). The analysis also includes the development of a global grid of revised annual coefficients for solar radiation (Rs) estimations using the respective Rs formula of H-S. The analysis was based on global gridded climatic data of the period 1950-2000. The method for deriving annual coefficients of the P-T and H-S methods was based on partial weighted averages (PWAs) of their mean monthly values. This method estimates the annual values considering the amplitude of the parameter under investigation (ETo and Rs) giving more weight to the monthly coefficients of the months with higher ETo values (or Rs values for the case of the H-S radiation formula). The method also eliminates the effect of unreasonably high or low monthly coefficients that may occur during periods where ETo and Rs fall below a specific threshold. The new coefficients were validated based on data from 140 stations located in various climatic zones of the USA and Australia with expanded observations up to 2016. The validation procedure for ETo estimations of the short reference crop showed that the P-T and H-S methods with the new revised coefficients outperformed the standard methods reducing the estimated root mean square error (RMSE) in ETo values by 40 and 25 %, respectively. The estimations of Rs using the H-S formula with revised coefficients reduced the RMSE by 28 % in comparison to the standard H-S formula. Finally, a raster database was built consisting of (a) global maps for the mean monthly ETo values estimated by ASCE-standardized method for both reference crops, (b) global maps for the revised annual coefficients of the P-T and H-S evapotranspiration methods for both reference crops and a global map for the revised annual coefficient of the H-S radiation formula and (c) global maps that indicate the optimum locations for using the standard P-T and H-S methods and their possible annual errors based on reference values. The database can support estimations of ETo and solar radiation for locations where climatic data are limited and it can support studies which require such estimations on larger scales (e.g. country, continent, world). The datasets produced in this study are archived in the PANGAEA database (this data set) and in the ESRN database (http://www.esrn-database.org or http://esrn-database.weebly.com).
Related to:
Allen, Richard G; Walter, Ivan A; Elliott, Ronald; Howell, Terry A; Itenfisu, Daniel; Jensen, Marvin E (2005): The ASCE standardized reference evapotranspiration equation. In: Allen RG, Walter IA, Elliott R, Howell T, Itenfisu D, Jensen M (eds.) Environmental and Water Resources Institute. Task Committee on Standardization of Reference Evapotranspiration of the Environmental and Water Resources Institute. University of Idaho, 70 pp, hdl:10013/epic.49050.d001
Hargreaves, George H; Samani, Zohrab A (1982): Estimating potential evapotranspiration. Journal of Irrigation and Drainage Division (ASCE), 108(IR3), 225-230
Hargreaves, George H; Samani, Zohrab A (1985): Reference crop evapotranspiration from ambient temperature. American Society of Agricultural Engineers, 12 pp, https://doi.org/10.13031/2013.26773
Hijmans, Robert J; Cameron, Susan E; Parra, J L; Jones, Peter G; Jarvis, A (2005): Very high resolution interpolated climate surfaces for global land areas. International Journal of Climatology, 25(15), 1965-1978, https://doi.org/10.1002/joc.1276
Priestley, C H B; Taylor, R J (1972): On the assessment of surface heat flux and evaporation using large-scale parameters. Monthly Weather Review, 100, 81-92
Sheffield, J; Goteti, G; Wood, Eric F (2006): Development of a 50-Year high-resolution global dataset of meteorological forcings for land surface modeling. Journal of Climate, 19(13), 3088-3111, https://doi.org/10.1175/JCLI3790.1
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | ORDINAL NUMBER | Ord No | Aschonitis, Vassilis G | Geocode | ||
2 | File content | Content | Aschonitis, Vassilis G | |||
3 | Analytical method | Method | Aschonitis, Vassilis G | |||
4 | Comment | Comment | Aschonitis, Vassilis G | |||
5 | File name | File name | Aschonitis, Vassilis G | |||
6 | File format | File format | Aschonitis, Vassilis G | |||
7 | File size | File size | kByte | Aschonitis, Vassilis G | zipped | |
8 | Uniform resource locator/link to file | URL file | Aschonitis, Vassilis G |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
385 data points
Data
1 Ord No | 2 Content | 3 Method | 4 Comment | 5 File name | 6 File format | 7 File size [kByte] | 8 URL file |
---|---|---|---|---|---|---|---|
1 | Re-adjusted Priestley-Taylor coefficient for short ref.crop ETo (rescaled ×100) (unitless)/(30 arc-sec) | Re-calibration of Priestley-Taylor coefficient apt=1.26 for ETo method (Priestley and Taylor, 1972) using ASCE-EWRI method (Allen et al., 2005) for short ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values). For zero values use the closest non-zero value. | ESRN-Database | 30arc-sec | apts1_30s | ESRI grid | 79287 | apts1_30s.zip |
2 | Re-adjusted Priestley-Taylor coefficient for tall ref.crop ETo (rescaled ×100) (unitless)/(30 arc-sec) | Re-calibration of Priestley-Taylor coefficient apt=1.26 for ETo method (Priestley and Taylor, 1972) using ASCE-EWRI method (Allen et al., 2005) for tall ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values). For zero values use the closest non-zero value. | ESRN-Database | 30arc-sec | aptt1_30s | ESRI grid | 92835 | aptt1_30s.zip |
3 | Re-adjusted Hargreaves-Samani coefficient for short ref.crop ETo (rescaled ×100,000) (unitless)/(30 arc-sec) | Re-calibration of Hargreaves-Samani coefficient chs2=0.0023 for ETo method (Hargreaves and Samani, 1982, 1985) using ASCE-EWRI method (Allen et al., 2005) for short ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values). For zero values use the closest non-zero value. | ESRN-Database | 30arc-sec | chs2s1_30s | ESRI grid | 102604 | chs2s1_30s.zip |
4 | Re-adjusted Hargreaves-Samani coefficient for tall ref.crop ETo (rescaled ×100,000) (unitless)/(30 arc-sec) | Re-calibration of Hargreaves-Samani coefficient chs2=0.0023 for ETo method (Hargreaves and Samani, 1982, 1985) using ASCE-EWRI method (Allen et al., 2005) for tall ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values). For zero values use the closest non-zero value. | ESRN-Database | 30arc-sec | chs2t1_30s | ESRI grid | 122897 | chs2t1_30s.zip |
5 | Hargeaves-Samani versus Priestley-Taylor (comparison between original methods versus ASCE-short) (DMADhp) (%)/(30 arc-sec) | abs(madhs)-abs(madpt), higher negative values suggest better performance of original Hargreaves-Samani ETo method while higher positive values suggest better performance of original Priestley-Taylor ETo method using as reference the ASCE-short | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 30arc-sec | dmadhp1_30s | ESRI grid | 83605 | dmadhp1_30s.zip |
6 | Mean monthly ASCE-ETo for short reference crop (clipped grass) (mm/month)/(30 arc-sec) | ASCE-EWRI method (Allen et al., 2005) using climatic data from Hijmans et al. (2005) and Sheffield et al. (2006) | the zip contains 12 rasters (ESRI-grids) for each month (January is the first month) | ESRN-Database | 30arc-sec | etos1_30s | ESRI grid | 784635 | etos1_30s.zip |
7 | Mean monthly ASCE-ETo for tall reference crop (alfalfa) (mm/month)/(30 arc-sec) | ASCE-EWRI method (Allen et al., 2005) using climatic data from Hijmans et al. (2005) and Sheffield et al. (2006) | the zip contains 12 rasters (ESRI-grids) for each month (January is the first month) | ESRN-Database | 30arc-sec | etot1_30s | ESRI grid | 958324 | etot1_30s.zip |
8 | Re-adjusted coefficient for solar radiation formula of Hargreaves-Samani (rescaled ×1000) (unitless)/(30 arc-sec) | Re-calibration of Hargreaves-Samani coefficient krs=0.16-0.19 for solar radiation formula (Hargreaves and Samani, 1982, 1985) using solar radiation data (from Sheffield et al., 2006) | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 30arc-sec | krs1_30s | ESRI grid | 44302 | krs1_30s.zip |
9 | Expected Mean Annual Difference/Error (MAD%) between original Hargreaves-Samani ETo and ASCE-ETo for short ref.crop (%)/(30 arc-sec) | 100*[(Annual ETo H-S)-(Annual ETo ASCE-short)]/(Annual ETo ASCE-short), Annual ETo H-S is estimated with the typical value chs2=0.0023 | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 30arc-sec | madhs1_30s | ESRI grid | 79345 | madhs1_30s.zip |
10 | Expected Mean Annual Difference/Error (MAD%) between original Priestley-Taylor ETo and ASCE-ETo for short ref.crop (%)/(30 arc-sec) | 100*[(Annual ETo P-T)-(Annual ETo ASCE-short)]/(Annual ETo ASCE-short), Annual ETo P-T is estimated with the typical value apt=1.26 | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 30arc-sec | madpt1_30s | ESRI grid | 77184 | madpt1_30s.zip |
11 | Expected Mean Annual Difference/Error (MAD%) between original Hargreaves-Samani radiation formula versus solar radiation data (%)/(30 arc-sec) | 100*[(Annual RS of H-S)-(Annual RS data)]/(Annual RS data), Annual RS H-S is estimated with the typical value krs=0.17 and RS obtained from Sheffield et al. (2006) | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 30arc-sec | madrs1_30s | ESRI grid | 57097 | madrs1_30s.zip |
12 | Re-adjusted Priestley-Taylor coefficient for short ref.crop ETo (rescaled ×100) (unitless)/(2.5 arc-min) | Re-calibration of Priestley-Taylor coefficient apt=1.26 for ETo method (Priestley and Taylor, 1972) using ASCE-EWRI method (Allen et al., 2005) for short ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 2-5arc-min | apts2_2-5m | ESRI grid | 4647 | apts2_2-5m.zip |
13 | Re-adjusted Priestley-Taylor coefficient for tall ref.crop ETo (rescaled ×100) (unitless)/(2.5 arc-min) | Re-calibration of Priestley-Taylor coefficient apt=1.26 for ETo method (Priestley and Taylor, 1972) using ASCE-EWRI method (Allen et al., 2005) for tall ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 2-5arc-min | aptt2_2-5m | ESRI grid | 5297 | aptt2_2-5m.zip |
14 | Re-adjusted Hargreaves-Samani coefficient for short ref.crop ETo (rescaled ×100,000) (unitless)/(2.5 arc-min) | Re-calibration of Hargreaves-Samani coefficient chs2=0.0023 for ETo method (Hargreaves and Samani, 1982, 1985) using ASCE-EWRI method (Allen et al., 2005) for short ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 2-5arc-min | chs2s2_2-5m | ESRI grid | 5434 | chs2s2_2-5m.zip |
15 | Re-adjusted Hargreaves-Samani coefficient for tall ref.crop ETo (rescaled ×100,000) (unitless)/(2.5 arc-min) | Re-calibration of Hargreaves-Samani coefficient chs2=0.0023 for ETo method (Hargreaves and Samani, 1982, 1985) using ASCE-EWRI method (Allen et al., 2005) for tall ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 2-5arc-min | chs2t2_2-5m | ESRI grid | 6535 | chs2t2_2-5m.zip |
16 | Hargeaves-Samani versus Priestley-Taylor (comparison between original methods versus ASCE-short) (DMADhp) (%)/(2.5 arc-min) | abs(madhs)-abs(madpt), higher negative values suggest better performance of original Hargreaves-Samani ETo method while higher positive values suggest better performance of original Priestley-Taylor ETo method using as reference the ASCE-short | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 2-5arc-min | dmadhp2_2-5m | ESRI grid | 4660 | dmadhp2_2-5m.zip |
17 | Mean monthly ASCE-ETo for short reference crop (clipped grass) (mm/month)/(2.5 arc-min) | ASCE-EWRI method (Allen et al., 2005) using climatic data from Hijmans et al. (2005) and Sheffield et al. (2006) | the zip contains 12 rasters (ESRI-grids) for each month (January is the first month) | ESRN-Database | 2-5arc-min | etos2_2-5m | ESRI grid | 46007 | etos2_2-5m.zip |
18 | Mean monthly ASCE-ETo for tall reference crop (alfalfa) (mm/month)/(2.5 arc-min) | ASCE-EWRI method (Allen et al., 2005) using climatic data from Hijmans et al. (2005) and Sheffield et al. (2006) | the zip contains 12 rasters (ESRI-grids) for each month (January is the first month) | ESRN-Database | 2-5arc-min | etot2_2-5m | ESRI grid | 54320 | etot2_2-5m.zip |
19 | Re-adjusted coefficient for solar radiation formula of Hargreaves-Samani (rescaled ×1000) (unitless)/(2.5 arc-min) | Re-calibration of Hargreaves-Samani coefficient krs=0.16-0.19 for solar radiation formula (Hargreaves and Samani, 1982, 1985) using solar radiation data (from Sheffield et al., 2006) | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 2-5arc-min | krs2_2-5m | ESRI grid | 3036 | krs2_2-5m.zip |
20 | Expected Mean Annual Difference/Error (MAD%) between original Hargreaves-Samani ETo and ASCE-ETo for short ref.crop (%)/(2.5 arc-min) | 100*[(Annual ETo H-S)-(Annual ETo ASCE-short)]/(Annual ETo ASCE-short), Annual ETo H-S is estimated with the typical value chs2=0.0023 | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 2-5arc-min | madhs2_2-5m | ESRI grid | 4467 | madhs2_2-5m.zip |
21 | Expected Mean Annual Difference/Error (MAD%) between original Priestley-Taylor ETo and ASCE-ETo for short ref.crop (%)/(2.5 arc-min) | 100*[(Annual ETo P-T)-(Annual ETo ASCE-short)]/(Annual ETo ASCE-short), Annual ETo P-T is estimated with the typical value apt=1.26 | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 2-5arc-min | madpt2_2-5m | ESRI grid | 4499 | madpt2_2-5m.zip |
22 | Expected Mean Annual Difference/Error (MAD%) between original Hargreaves-Samani radiation formula versus solar radiation data (%)/(2.5 arc-min) | 100*[(Annual RS of H-S)-(Annual RS data)]/(Annual RS data), Annual RS H-S is estimated with the typical value krs=0.17 and RS obtained from Sheffield et al. (2006) | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 2-5arc-min | madrs2_2-5m | ESRI grid | 3493 | madrs2_2-5m.zip |
23 | Re-adjusted Priestley-Taylor coefficient for short ref.crop ETo (rescaled ×100) (unitless)/(5 arc-min) | Re-calibration of Priestley-Taylor coefficient apt=1.26 for ETo method (Priestley and Taylor, 1972) using ASCE-EWRI method (Allen et al., 2005) for short ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 5arc-min | apts3_5m | ESRI grid | 1336 | apts3_5m.zip |
24 | Re-adjusted Priestley-Taylor coefficient for tall ref.crop ETo (rescaled ×100) (unitless)/(5 arc-min) | Re-calibration of Priestley-Taylor coefficient apt=1.26 for ETo method (Priestley and Taylor, 1972) using ASCE-EWRI method (Allen et al., 2005) for tall ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 5arc-min | aptt3_5m | ESRI grid | 1532 | aptt3_5m.zip |
25 | Re-adjusted Hargreaves-Samani coefficient for short ref.crop ETo (rescaled ×100,000) (unitless)/(5 arc-min) | Re-calibration of Hargreaves-Samani coefficient chs2=0.0023 for ETo method (Hargreaves and Samani, 1982, 1985) using ASCE-EWRI method (Allen et al., 2005) for short ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 5arc-min | chs2s3_5m | ESRI grid | 1546 | chs2s3_5m.zip |
26 | Re-adjusted Hargreaves-Samani coefficient for tall ref.crop ETo (rescaled ×100,000) (unitless)/(5 arc-min) | Re-calibration of Hargreaves-Samani coefficient chs2=0.0023 for ETo method (Hargreaves and Samani, 1982, 1985) using ASCE-EWRI method (Allen et al., 2005) for tall ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 5arc-min | chs2t3_5m | ESRI grid | 1876 | chs2t3_5m.zip |
27 | Hargeaves-Samani versus Priestley-Taylor (comparison between original methods versus ASCE-short) (DMADhp) (%)/(5 arc-min) | abs(madhs)-abs(madpt), higher negative values suggest better performance of original Hargreaves-Samani ETo method while higher positive values suggest better performance of original Priestley-Taylor ETo method using as reference the ASCE-short | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 5arc-min | dmadhp3_5m | ESRI grid | 1317 | dmadhp3_5m.zip |
28 | Mean monthly ASCE-ETo for short reference crop (clipped grass) (mm/month)/(5 arc-min) | ASCE-EWRI method (Allen et al., 2005) using climatic data from Hijmans et al. (2005) and Sheffield et al. (2006) | the zip contains 12 rasters (ESRI-grids) for each month (January is the first month) | ESRN-Database | 5arc-min | etos3_5m | ESRI grid | 13270 | etos3_5m.zip |
29 | Mean monthly ASCE-ETo for tall reference crop (alfalfa) (mm/month)/(5 arc-min) | ASCE-EWRI method (Allen et al., 2005) using climatic data from Hijmans et al. (2005) and Sheffield et al. (2006) | the zip contains 12 rasters (ESRI-grids) for each month (January is the first month) | ESRN-Database | 5arc-min | etot3_5m | ESRI grid | 15634 | etot3_5m.zip |
30 | Re-adjusted coefficient for solar radiation formula of Hargreaves-Samani (rescaled ×1000) (unitless)/(5 arc-min) | Re-calibration of Hargreaves-Samani coefficient krs=0.16-0.19 for solar radiation formula (Hargreaves and Samani, 1982, 1985) using solar radiation data (from Sheffield et al., 2006) | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 5arc-min | krs3_5m | ESRI grid | 950 | krs3_5m.zip |
31 | Expected Mean Annual Difference/Error (MAD%) between original Hargreaves-Samani ETo and ASCE-ETo for short ref.crop (%)/(5 arc-min) | 100*[(Annual ETo H-S)-(Annual ETo ASCE-short)]/(Annual ETo ASCE-short), Annual ETo H-S is estimated with the typical value chs2=0.0023 | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 5arc-min | madhs3_5m | ESRI grid | 1264 | madhs3_5m.zip |
32 | Expected Mean Annual Difference/Error (MAD%) between original Priestley-Taylor ETo and ASCE-ETo for short ref.crop (%)/(5 arc-min) | 100*[(Annual ETo P-T)-(Annual ETo ASCE-short)]/(Annual ETo ASCE-short), Annual ETo P-T is estimated with the typical value apt=1.26 | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 5arc-min | madpt3_5m | ESRI grid | 1281 | madpt3_5m.zip |
33 | Expected Mean Annual Difference/Error (MAD%) between original Hargreaves-Samani radiation formula versus solar radiation data (%)/(5 arc-min) | 100*[(Annual RS of H-S)-(Annual RS data)]/(Annual RS data), Annual RS H-S is estimated with the typical value krs=0.17 and RS obtained from Sheffield et al. (2006) | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 5arc-min | madrs3_5m | ESRI grid | 1029 | madrs3_5m.zip |
34 | Re-adjusted Priestley-Taylor coefficient for short ref.crop ETo (rescaled ×100) (unitless)/(10 arc-min) | Re-calibration of Priestley-Taylor coefficient apt=1.26 for ETo method (Priestley and Taylor, 1972) using ASCE-EWRI method (Allen et al., 2005) for short ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 10arc-min | apts4_10m | ESRI grid | 392 | apts4_10m.zip |
35 | Re-adjusted Priestley-Taylor coefficient for tall ref.crop ETo (rescaled ×100) (unitless)/(10 arc-min) | Re-calibration of Priestley-Taylor coefficient apt=1.26 for ETo method (Priestley and Taylor, 1972) using ASCE-EWRI method (Allen et al., 2005) for tall ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 10arc-min | aptt4_10m | ESRI grid | 447 | aptt4_10m.zip |
36 | Re-adjusted Hargreaves-Samani coefficient for short ref.crop ETo (rescaled ×100,000) (unitless)/(10 arc-min) | Re-calibration of Hargreaves-Samani coefficient chs2=0.0023 for ETo method (Hargreaves and Samani, 1982, 1985) using ASCE-EWRI method (Allen et al., 2005) for short ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 10arc-min | chs2s4_10m | ESRI grid | 450 | chs2s4_10m.zip |
37 | Re-adjusted Hargreaves-Samani coefficient for tall ref.crop ETo (rescaled ×100,000) (unitless)/(10 arc-min) | Re-calibration of Hargreaves-Samani coefficient chs2=0.0023 for ETo method (Hargreaves and Samani, 1982, 1985) using ASCE-EWRI method (Allen et al., 2005) for tall ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 10arc-min | chs2t4_10m | ESRI grid | 540 | chs2t4_10m.zip |
38 | Hargeaves-Samani versus Priestley-Taylor (comparison between original methods versus ASCE-short) (DMADhp) (%)/(10 arc-min) | abs(madhs)-abs(madpt), higher negative values suggest better performance of original Hargreaves-Samani ETo method while higher positive values suggest better performance of original Priestley-Taylor ETo method using as reference the ASCE-short | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 10arc-min | dmadhp4_10m | ESRI grid | 380 | dmadhp4_10m.zip |
39 | Mean monthly ASCE-ETo for short reference crop (clipped grass) (mm/month)/(10 arc-min) | ASCE-EWRI method (Allen et al., 2005) using climatic data from Hijmans et al. (2005) and Sheffield et al. (2006) | the zip contains 12 rasters (ESRI-grids) for each month (January is the first month) | ESRN-Database | 10arc-min | etos4_10m | ESRI grid | 3903 | etos4_10m.zip |
40 | Mean monthly ASCE-ETo for tall reference crop (alfalfa) (mm/month)/(10 arc-min) | ASCE-EWRI method (Allen et al., 2005) using climatic data from Hijmans et al. (2005) and Sheffield et al. (2006) | the zip contains 12 rasters (ESRI-grids) for each month (January is the first month) | ESRN-Database | 10arc-min | etot4_10m | ESRI grid | 4550 | etot4_10m.zip |
41 | Re-adjusted coefficient for solar radiation formula of Hargreaves-Samani (rescaled ×1000) (unitless)/(10 arc-min) | Re-calibration of Hargreaves-Samani coefficient krs=0.16-0.19 for solar radiation formula (Hargreaves and Samani, 1982, 1985) using solar radiation data (from Sheffield et al., 2006) | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 10arc-min | krs4_10m | ESRI grid | 302 | krs4_10m.zip |
42 | Expected Mean Annual Difference/Error (MAD%) between original Hargreaves-Samani ETo and ASCE-ETo for short ref.crop (%)/(10 arc-min) | 100*[(Annual ETo H-S)-(Annual ETo ASCE-short)]/(Annual ETo ASCE-short), Annual ETo H-S is estimated with the typical value chs2=0.0023 | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 10arc-min | madhs4_10m | ESRI grid | 366 | madhs4_10m.zip |
43 | Expected Mean Annual Difference/Error (MAD%) between original Priestley-Taylor ETo and ASCE-ETo for short ref.crop (%)/(10 arc-min) | 100*[(Annual ETo P-T)-(Annual ETo ASCE-short)]/(Annual ETo ASCE-short), Annual ETo P-T is estimated with the typical value apt=1.26 | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 10arc-min | madpt4_10m | ESRI grid | 370 | madpt4_10m.zip |
44 | Expected Mean Annual Difference/Error (MAD%) between original Hargreaves-Samani radiation formula versus solar radiation data (%)/(10 arc-min) | 100*[(Annual RS of H-S)-(Annual RS data)]/(Annual RS data), Annual RS H-S is estimated with the typical value krs=0.17 and RS obtained from Sheffield et al. (2006) | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 10arc-min | madrs4_10m | ESRI grid | 304 | madrs4_10m.zip |
45 | Re-adjusted Priestley-Taylor coefficient for short ref.crop ETo (rescaled ×100) (unitless)/(0.5 deg) | Re-calibration of Priestley-Taylor coefficient apt=1.26 for ETo method (Priestley and Taylor, 1972) using ASCE-EWRI method (Allen et al., 2005) for short ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 0-5deg | apts5_0-5d | ESRI grid | 63 | apts5_0-5d.zip |
46 | Re-adjusted Priestley-Taylor coefficient for tall ref.crop ETo (rescaled ×100) (unitless)/(0.5 deg) | Re-calibration of Priestley-Taylor coefficient apt=1.26 for ETo method (Priestley and Taylor, 1972) using ASCE-EWRI method (Allen et al., 2005) for tall ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 0-5deg | aptt5_0-5d | ESRI grid | 69 | aptt5_0-5d.zip |
47 | Re-adjusted Hargreaves-Samani coefficient for short ref.crop ETo (rescaled ×100,000) (unitless)/(0.5 deg) | Re-calibration of Hargreaves-Samani coefficient chs2=0.0023 for ETo method (Hargreaves and Samani, 1982, 1985) using ASCE-EWRI method (Allen et al., 2005) for short ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 0-5deg | chs2s5_0-5d | ESRI grid | 71 | chs2s5_0-5d.zip |
48 | Re-adjusted Hargreaves-Samani coefficient for tall ref.crop ETo (rescaled ×100,000) (unitless)/(0.5 deg) | Re-calibration of Hargreaves-Samani coefficient chs2=0.0023 for ETo method (Hargreaves and Samani, 1982, 1985) using ASCE-EWRI method (Allen et al., 2005) for tall ref.crop | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 0-5deg | chs2t5_0-5d | ESRI grid | 82 | chs2t5_0-5d.zip |
49 | Hargeaves-Samani versus Priestley-Taylor (comparison between original methods versus ASCE-short) (DMADhp) (%)/(0.5 deg) | abs(madhs)-abs(madpt), higher negative values suggest better performance of original Hargreaves-Samani ETo method while higher positive values suggest better performance of original Priestley-Taylor ETo method using as reference the ASCE-short | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 0-5deg | dmadhp5_0-5d | ESRI grid | 60 | dmadhp5_0-5d.zip |
50 | Mean monthly ASCE-ETo for short reference crop (clipped grass) (mm/month)/(0.5 deg) | ASCE-EWRI method (Allen et al., 2005) using climatic data from Hijmans et al. (2005) and Sheffield et al. (2006) | the zip contains 12 rasters (ESRI-grids) for each month (January is the first month) | ESRN-Database | 0-5deg | etos5_0-5d | ESRI grid | 647 | etos5_0-5d.zip |
51 | Mean monthly ASCE-ETo for tall reference crop (alfalfa) (mm/month)/(0.5 deg) | ASCE-EWRI method (Allen et al., 2005) using climatic data from Hijmans et al. (2005) and Sheffield et al. (2006) | the zip contains 12 rasters (ESRI-grids) for each month (January is the first month) | ESRN-Database | 0-5deg | etot5_0-5d | ESRI grid | 728 | etot5_0-5d.zip |
52 | Re-adjusted coefficient for solar radiation formula of Hargreaves-Samani (rescaled ×1000) (unitless)/(0.5 deg) | Re-calibration of Hargreaves-Samani coefficient krs=0.16-0.19 for solar radiation formula (Hargreaves and Samani, 1982, 1985) using solar radiation data (from Sheffield et al., 2006) | the zip contains 1 raster (ESRI-grid) (partial weighted average of mean monthly values) | ESRN-Database | 0-5deg | krs5_0-5d | ESRI grid | 55 | krs5_0-5d.zip |
53 | Expected Mean Annual Difference/Error (MAD%) between original Hargreaves-Samani ETo and ASCE-ETo for short ref.crop (%)/(0.5 deg) | 100*[(Annual ETo H-S)-(Annual ETo ASCE-short)]/(Annual ETo ASCE-short), Annual ETo H-S is estimated with the typical value chs2=0.0023 | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 0-5deg | madhs5_0-5d | ESRI grid | 59 | madhs5_0-5d.zip |
54 | Expected Mean Annual Difference/Error (MAD%) between original Priestley-Taylor ETo and ASCE-ETo for short ref.crop (%)/(0.5 deg) | 100*[(Annual ETo P-T)-(Annual ETo ASCE-short)]/(Annual ETo ASCE-short), Annual ETo P-T is estimated with the typical value apt=1.26 | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 0-5deg | madpt5_0-5d | ESRI grid | 59 | madpt5_0-5d.zip |
55 | Expected Mean Annual Difference/Error (MAD%) between original Hargreaves-Samani radiation formula versus solar radiation data (%)/(0.5 deg) | 100*[(Annual RS of H-S)-(Annual RS data)]/(Annual RS data), Annual RS H-S is estimated with the typical value krs=0.17 and RS obtained from Sheffield et al. (2006) | the zip contains 1 raster (ESRI-grid) | ESRN-Database | 0-5deg | madrs5_0-5d | ESRI grid | 52 | madrs5_0-5d.zip |