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Spatial-temporal statistics of daily surface runoff data from the NLDAS model (1979-2013)


Authors: Gonzalo Espinoza-Dávalos · David Maidment · David Arctur · William Teng · Georges Comair
Owners: Gonzalo Espinoza-Dávalos
Resource type:Multidimensional (NetCDF)
Created:Jan. 24, 2017, 8:34 p.m.
Last updated: Jan. 30, 2017, midnight by Gonzalo Espinoza-Dávalos

Abstract

The data set contains the daily statistics for the SSRUNsfc variable (surface runoff - non-infiltrating) of the North American Land Data Assimilation System Version 2 (NLDAS-2) model. The period of analysis is from 1979-01-02 to 2013-12-31. The statistics for each calendar month are the mean, standard deviation, minimum, maximum, probability of event, and percentiles in 0.05 interval. The data set also includes a p-value per calendar day of the Kolmogorov-Smirnov (KS) test. The p-value of the KS test shows if the computed empirical cumulative distribution function (CDF) comes from a fitted gamma distribution given that there was a runoff event.

Subject

nldas, land-surface models, surface runoff

How to cite

Espinoza-Dávalos, G., D. Maidment, D. Arctur, W. Teng, G. Comair (2017). Spatial-temporal statistics of daily surface runoff data from the NLDAS model (1979-2013), HydroShare, http://dx.doi.org/10.4211/hs.fbc7af608a324a7a9cbbdd415d0a9499

This resource is shared under the Creative Commons Attribution-NoCommercial CC BY-NC.

 http://creativecommons.org/licenses/by-nc/4.0/
CC-BY-NC

Sharing status:

  • Published Resource  Published

Coverage

Spatial:

 Coordinate System/Geographic Projection:  WGS 84 EPSG:4326
 Coordinate Units:  Decimal degrees
North Latitude
49.5000°
East Longitude
-67.0000°
South Latitude
25.1250°
West Longitude
-124.7500°

Temporal:

 Start Date:
 End Date:

Content

Download All Content as Zipped BagIt Archive
Learn more about the Bagit archive format

Authors

The people or organizations that created the intellectual content of the resource.

Name Organization Address Phone
Gonzalo Espinoza-Dávalos UNESCO-IHE Institute for Water Education
David Maidment University of Texas at Austin
David Arctur University of Texas at Austin 512-771-1434
William Teng NASA Goddard Earth Sciences Data and Information Services Center (ADNET Systems)
Georges Comair World Bank

Sources


Derived From:
NLDAS-2

Relations


cites:
Espinoza-Dávalos, G. E., Arctur, D. K., Teng, W., Maidment, D. R., García-Martí, I., & Comair, G. (2016). Studying soil moisture at a national level through statistical analysis of NASA NLDAS data. Journal of Hydroinformatics, 18(2), 277–287.
cites:
Espinoza-Dávalos, G. E. (2016). Large-scale statistical analysis of NLDAS variables and hydrologic web applications. The University of Texas at Austin. Retrieved from http://hdl.handle.net/2152/39608
Spatial Reference
Coordinate Reference System 'GCS_WGS_1984'
Datum 'D_WGS_1984'
Coordinate String Type WKT String
Coordinate String GEOGCS['GCS_WGS_1984',DATUM['D_WGS_1984',SPHEROID['WGS_1984',6378137.0,298.257223563]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]]

Extent

North 49.5
East -67.0
South 25.125
West -124.75
Extent Unitdegree
Variables
p60
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.60 percentile
Comment 0.60 percentile of the day of the year
p65
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.65 percentile
Comment 0.65 percentile of the day of the year
p80
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.80 percentile
Comment 0.80 percentile of the day of the year
p85
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.85 percentile
Comment 0.85 percentile of the day of the year
p25
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.25 percentile
Comment 0.25 percentile of the day of the year
p20
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.20 percentile
Comment 0.20 percentile of the day of the year
p05
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.05 percentile
Comment 0.05 percentile of the day of the year
p45
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.45 percentile
Comment 0.45 percentile of the day of the year
p40
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.40 percentile
Comment 0.40 percentile of the day of the year
min
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name minimum
Comment Minimum value of the day of the year
prob_evt
Unit -
Type Float
Shape time,latitude,longitude
Long Name Probability of event
Comment Probability of runoff on that day of the year
latitude
Unit degrees_north
Type Float
Shape latitude
p75
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.75 percentile
Comment 0.75 percentile of the day of the year
p70
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.70 percentile
Comment 0.70 percentile of the day of the year
p_value
Unit -
Type Float
Shape time,latitude,longitude
Long Name p-value
Comment P-value of the Kolmogorov-Smirnov goodness-of-fit test for a gamma theoretical distribution
p90
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.90 percentile
Comment 0.90 percentile of the day of the year
max
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name maximum
Comment Maximum value of the day of the year
p95
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.95 percentile
Comment 0.95 percentile of the day of the year
p10
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.10 percentile
Comment 0.10 percentile of the day of the year
p15
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.15 percentile
Comment 0.15 percentile of the day of the year
p55
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.55 percentile
Comment 0.55 percentile of the day of the year
p30
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.30 percentile
Comment 0.30 percentile of the day of the year
p50
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.50 percentile
Comment 0.50 percentile of the day of the year
p35
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name 0.35 percentile
Comment 0.35 percentile of the day of the year
crs
Unit Unknown
Type Unknown
Shape Not defined
longitude
Unit degrees_east
Type Float
Shape longitude
time
Unit Day of the year (leap year)
Type Int
Shape time
mean
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name daily mean
Comment Mean value of the day of the of the year
sd
Unit kg/m^2
Type Float
Shape time,latitude,longitude
Long Name daily standard deviation
Comment Standard deviation of the day of the year

NetCDF Header Info

NLDAS_NOAH0125_D_002_SSRUNsfc_CONUS_header_info.txt

netcdf SurfaceRunoff_daily {
dimensions:
	latitude = 195 ;
	longitude = 462 ;
	time = 366 ;
variables:
	float latitude(latitude) ;
		latitude:_FillValue = -9999.f ;
		latitude:units = "degrees_north" ;
		latitude:standard_name = "latitude" ;
		latitude:axis = "Y" ;
	float longitude(longitude) ;
		longitude:_FillValue = -9999.f ;
		longitude:units = "degrees_east" ;
		longitude:standard_name = "longitude" ;
		longitude:axis = "X" ;
	int time(time) ;
		time:_FillValue = -9999 ;
		time:standard_name = "time" ;
		time:calendar = "gregorian" ;
		time:time_step = "Day" ;
		time:units = "Day of the year (leap year)" ;
		time:axis = "T" ;
	int crs ;
		crs:grid_mapping_name = "latitude_longitude" ;
		crs:crs_wkt = "GEOGCS[\'GCS_WGS_1984\',DATUM[\'D_WGS_1984\',SPHEROID[\'WGS_1984\',6378137.0,298.257223563]],PRIMEM[\'Greenwich\',0.0],UNIT[\'Degree\',0.0174532925199433]]" ;
	float mean(time, latitude, longitude) ;
		mean:_FillValue = -9999.f ;
		mean:units = "kg/m^2" ;
		mean:long_name = "daily mean" ;
		mean:param_short_name = "SSRUNsfc" ;
		mean:grid_mapping = "crs" ;
		mean:comment = "Mean value of the day of the of the year" ;
		mean:param_name = "surface runoff - non-infiltrating" ;
	float sd(time, latitude, longitude) ;
		sd:_FillValue = -9999.f ;
		sd:units = "kg/m^2" ;
		sd:long_name = "daily standard deviation" ;
		sd:param_short_name = "SSRUNsfc" ;
		sd:grid_mapping = "crs" ;
		sd:comment = "Standard deviation of the day of the year" ;
		sd:param_name = "surface runoff - non-infiltrating" ;
	float min(time, latitude, longitude) ;
		min:_FillValue = -9999.f ;
		min:units = "kg/m^2" ;
		min:long_name = "minimum" ;
		min:param_short_name = "SSRUNsfc" ;
		min:grid_mapping = "crs" ;
		min:comment = "Minimum value of the day of the year" ;
		min:param_name = "surface runoff - non-infiltrating" ;
	float max(time, latitude, longitude) ;
		max:_FillValue = -9999.f ;
		max:units = "kg/m^2" ;
		max:long_name = "maximum" ;
		max:param_short_name = "SSRUNsfc" ;
		max:grid_mapping = "crs" ;
		max:comment = "Maximum value of the day of the year" ;
		max:param_name = "surface runoff - non-infiltrating" ;
	float p05(time, latitude, longitude) ;
		p05:_FillValue = -9999.f ;
		p05:units = "kg/m^2" ;
		p05:long_name = "0.05 percentile" ;
		p05:param_short_name = "SSRUNsfc" ;
		p05:grid_mapping = "crs" ;
		p05:comment = "0.05 percentile of the day of the year" ;
		p05:param_name = "surface runoff - non-infiltrating" ;
	float p10(time, latitude, longitude) ;
		p10:_FillValue = -9999.f ;
		p10:units = "kg/m^2" ;
		p10:long_name = "0.10 percentile" ;
		p10:param_short_name = "SSRUNsfc" ;
		p10:grid_mapping = "crs" ;
		p10:comment = "0.10 percentile of the day of the year" ;
		p10:param_name = "surface runoff - non-infiltrating" ;
	float p15(time, latitude, longitude) ;
		p15:_FillValue = -9999.f ;
		p15:units = "kg/m^2" ;
		p15:long_name = "0.15 percentile" ;
		p15:param_short_name = "SSRUNsfc" ;
		p15:grid_mapping = "crs" ;
		p15:comment = "0.15 percentile of the day of the year" ;
		p15:param_name = "surface runoff - non-infiltrating" ;
	float p20(time, latitude, longitude) ;
		p20:_FillValue = -9999.f ;
		p20:units = "kg/m^2" ;
		p20:long_name = "0.20 percentile" ;
		p20:param_short_name = "SSRUNsfc" ;
		p20:grid_mapping = "crs" ;
		p20:comment = "0.20 percentile of the day of the year" ;
		p20:param_name = "surface runoff - non-infiltrating" ;
	float p25(time, latitude, longitude) ;
		p25:_FillValue = -9999.f ;
		p25:units = "kg/m^2" ;
		p25:long_name = "0.25 percentile" ;
		p25:param_short_name = "SSRUNsfc" ;
		p25:grid_mapping = "crs" ;
		p25:comment = "0.25 percentile of the day of the year" ;
		p25:param_name = "surface runoff - non-infiltrating" ;
	float p30(time, latitude, longitude) ;
		p30:_FillValue = -9999.f ;
		p30:units = "kg/m^2" ;
		p30:long_name = "0.30 percentile" ;
		p30:param_short_name = "SSRUNsfc" ;
		p30:grid_mapping = "crs" ;
		p30:comment = "0.30 percentile of the day of the year" ;
		p30:param_name = "surface runoff - non-infiltrating" ;
	float p35(time, latitude, longitude) ;
		p35:_FillValue = -9999.f ;
		p35:units = "kg/m^2" ;
		p35:long_name = "0.35 percentile" ;
		p35:param_short_name = "SSRUNsfc" ;
		p35:grid_mapping = "crs" ;
		p35:comment = "0.35 percentile of the day of the year" ;
		p35:param_name = "surface runoff - non-infiltrating" ;
	float p40(time, latitude, longitude) ;
		p40:_FillValue = -9999.f ;
		p40:units = "kg/m^2" ;
		p40:long_name = "0.40 percentile" ;
		p40:param_short_name = "SSRUNsfc" ;
		p40:grid_mapping = "crs" ;
		p40:comment = "0.40 percentile of the day of the year" ;
		p40:param_name = "surface runoff - non-infiltrating" ;
	float p45(time, latitude, longitude) ;
		p45:_FillValue = -9999.f ;
		p45:units = "kg/m^2" ;
		p45:long_name = "0.45 percentile" ;
		p45:param_short_name = "SSRUNsfc" ;
		p45:grid_mapping = "crs" ;
		p45:comment = "0.45 percentile of the day of the year" ;
		p45:param_name = "surface runoff - non-infiltrating" ;
	float p50(time, latitude, longitude) ;
		p50:_FillValue = -9999.f ;
		p50:units = "kg/m^2" ;
		p50:long_name = "0.50 percentile" ;
		p50:param_short_name = "SSRUNsfc" ;
		p50:grid_mapping = "crs" ;
		p50:comment = "0.50 percentile of the day of the year" ;
		p50:param_name = "surface runoff - non-infiltrating" ;
	float p55(time, latitude, longitude) ;
		p55:_FillValue = -9999.f ;
		p55:units = "kg/m^2" ;
		p55:long_name = "0.55 percentile" ;
		p55:param_short_name = "SSRUNsfc" ;
		p55:grid_mapping = "crs" ;
		p55:comment = "0.55 percentile of the day of the year" ;
		p55:param_name = "surface runoff - non-infiltrating" ;
	float p60(time, latitude, longitude) ;
		p60:_FillValue = -9999.f ;
		p60:units = "kg/m^2" ;
		p60:long_name = "0.60 percentile" ;
		p60:param_short_name = "SSRUNsfc" ;
		p60:grid_mapping = "crs" ;
		p60:comment = "0.60 percentile of the day of the year" ;
		p60:param_name = "surface runoff - non-infiltrating" ;
	float p65(time, latitude, longitude) ;
		p65:_FillValue = -9999.f ;
		p65:units = "kg/m^2" ;
		p65:long_name = "0.65 percentile" ;
		p65:param_short_name = "SSRUNsfc" ;
		p65:grid_mapping = "crs" ;
		p65:comment = "0.65 percentile of the day of the year" ;
		p65:param_name = "surface runoff - non-infiltrating" ;
	float p70(time, latitude, longitude) ;
		p70:_FillValue = -9999.f ;
		p70:units = "kg/m^2" ;
		p70:long_name = "0.70 percentile" ;
		p70:param_short_name = "SSRUNsfc" ;
		p70:grid_mapping = "crs" ;
		p70:comment = "0.70 percentile of the day of the year" ;
		p70:param_name = "surface runoff - non-infiltrating" ;
	float p75(time, latitude, longitude) ;
		p75:_FillValue = -9999.f ;
		p75:units = "kg/m^2" ;
		p75:long_name = "0.75 percentile" ;
		p75:param_short_name = "SSRUNsfc" ;
		p75:grid_mapping = "crs" ;
		p75:comment = "0.75 percentile of the day of the year" ;
		p75:param_name = "surface runoff - non-infiltrating" ;
	float p80(time, latitude, longitude) ;
		p80:_FillValue = -9999.f ;
		p80:units = "kg/m^2" ;
		p80:long_name = "0.80 percentile" ;
		p80:param_short_name = "SSRUNsfc" ;
		p80:grid_mapping = "crs" ;
		p80:comment = "0.80 percentile of the day of the year" ;
		p80:param_name = "surface runoff - non-infiltrating" ;
	float p85(time, latitude, longitude) ;
		p85:_FillValue = -9999.f ;
		p85:units = "kg/m^2" ;
		p85:long_name = "0.85 percentile" ;
		p85:param_short_name = "SSRUNsfc" ;
		p85:grid_mapping = "crs" ;
		p85:comment = "0.85 percentile of the day of the year" ;
		p85:param_name = "surface runoff - non-infiltrating" ;
	float p90(time, latitude, longitude) ;
		p90:_FillValue = -9999.f ;
		p90:units = "kg/m^2" ;
		p90:long_name = "0.90 percentile" ;
		p90:param_short_name = "SSRUNsfc" ;
		p90:grid_mapping = "crs" ;
		p90:comment = "0.90 percentile of the day of the year" ;
		p90:param_name = "surface runoff - non-infiltrating" ;
	float p95(time, latitude, longitude) ;
		p95:_FillValue = -9999.f ;
		p95:units = "kg/m^2" ;
		p95:long_name = "0.95 percentile" ;
		p95:param_short_name = "SSRUNsfc" ;
		p95:grid_mapping = "crs" ;
		p95:comment = "0.95 percentile of the day of the year" ;
		p95:param_name = "surface runoff - non-infiltrating" ;
	float p_value(time, latitude, longitude) ;
		p_value:_FillValue = -9999.f ;
		p_value:units = "-" ;
		p_value:long_name = "p-value" ;
		p_value:param_short_name = "SSRUNsfc" ;
		p_value:param_name = "SSRUNsfc" ;
		p_value:grid_mapping = "crs" ;
		p_value:comment = "P-value of the Kolmogorov-Smirnov goodness-of-fit test for a gamma theoretical distribution" ;
	float prob_evt(time, latitude, longitude) ;
		prob_evt:_FillValue = -9999.f ;
		prob_evt:units = "-" ;
		prob_evt:long_name = "Probability of event" ;
		prob_evt:param_short_name = "SSRUNsfc" ;
		prob_evt:grid_mapping = "crs" ;
		prob_evt:comment = "Probability of runoff on that day of the year" ;
		prob_evt:param_name = "surface runoff - non-infiltrating" ;

// global attributes:
		:creator_name = "Gonzalo E. Espinoza-Dávalos" ;
		:creator_email = "gespinoza@utexas.edu" ;
		:creator_url = "gespinoza.org" ;
		:license = "This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. https://creativecommons.org/licenses/by-nc/4.0/" ;
		:references = "Espinoza-Dávalos, G. E. (2016). Large-scale statistical analysis of NLDAS variables and hydrologic web applications. The University of Texas at Austin. Retrieved from http://hdl.handle.net/2152/39608; Espinoza-Dávalos, G. E., Arctur, D. K., Teng, W., Maidment, D. R., García-Martí, I., & Comair, G. (2016). Studying soil moisture at a national level through statistical analysis of NASA NLDAS data. Journal of Hydroinformatics, 18(2), 277–287. http://doi.org/10.2166/hydro.2015.231" ;
		:source = "NLDAS-2" ;
		:time_coverage_start = "1979-01-02" ;
		:time_coverage_end = "2013-12-31" ;
		:geospatial_lat_min = 25.125 ;
		:geospatial_lat_max = 49.5 ;
		:geospatial_lon_max = -67. ;
		:geospatial_lon_min = -124.75 ;
		:contributor_name = "" ;
		:title = "Spatial-temporal statistics of daily surface runoff data from the NLDAS model (1979-2013)" ;
		:keywords = "nldas, land-surface models, surface runoff" ;
		:summary = "The data set contains the daily statistics for the SSRUNsfc variable (surface runoff - non-infiltrating) of the North American Land Data Assimilation System Version 2 (NLDAS-2) model. The period of analysis is from 1979-01-02 to 2013-12-31. The statistics for each calendar month are the mean, standard deviation, minimum, maximum, probability of event, and percentiles in 0.05 interval. The data set also includes a p-value per calendar day of the Kolmogorov-Smirnov (KS) test. The p-value of the KS test shows if the computed empirical cumulative distribution function (CDF) comes from a fitted gamma distribution given that there was a runoff event." ;
		:authors_names = "Gonzalo E. Espinoza-Dávalos, David Maidment, David K. Arctur, William Teng, Georges Comair" ;
		:authors_organizations = "UNESCO-IHE Institute for Water Education, The University of Texas at Austin, The University of Texas at Austin, NASA Goddard Earth Sciences Data and Information Services Center (ADNET Systems), World Bank" ;
}

Credits

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
NASA ROSES NNH11ZDA001N-ACCESS: Bridging the Digital Divide
Texas Advanced Computing Center (TACC)

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