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John Hammond

Colorado State University

 Recent Activity

ABSTRACT:

Snow season length (SS), reported in days, is the length of time that snow is present on the ground on an annual basis. It is determined by finding the first and last snow occurrence for any given water year (Oct 1 - Sep 30 NH, Jan 1 - Dec 31 SH), and then finding the difference between these two dates. SS was calculated on a pixel by pixel basis using MODIS/Terra Snow Cover 8-Day L3 Global 500m Grid, Collection 6 obtained from the National Snow and Ice Data Center (NSIDC) for global calculation and MOD10A1 for US calculation. Spatial coverage is for MODIS tiles h08v04, h08v05, h09v04, h09v05, and h10v04 for water years 2001 - 2015. Files are provided in the "USA Contiguous Albers Equal Area Conic USGS" projection. Funding provided by NSF grant EAR-1446870.

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ABSTRACT:

This resource is useful for characterizing the intermittence of snow, or how continuously it covers an area (as opposed to snow persistence which quantifies the fraction of time that snow is present for any location for a defined time period: https://www.hydroshare.org/resource/1c62269aa802467688d25540caf2467e/, or the snow season, which provides the first day of snow occurrence, last day of snow occurrence, and the length of time between the first and last day of snow occurrence per water year: https://www.hydroshare.org/resource/197adcdc76b34591bd78a811bf1dfbfe/).Snow intermittence (snow to no snow counts) for the western U.S. for water years 2001 - 2015 contains annual and mean annual raster datasets with the number of snow to no snow events. The events consist of any time that there was snow that was present and then followed by bare ground within 10 days of the original snow fall. Both MOD10A1 and MOD10A2 binary snow products were used resulting in annual and mean annual rasters at the daily (MOD10A1) and 8-day (MOD10A2) temporal resolutions. This product is primarily intended for areas with sparse vegetation, as dense vegetation obscures the binary snow classification used for the MOD10A1 and MOD10A2 V5 products. These grids are available at the original 500 m MODIS resolution.

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ABSTRACT:

Snow season length (SS), reported in days, is the length of time that snow is present on the ground on an annual basis. It is determined by finding the first and last snow occurrence for any given year, and then finding the difference between these two dates. SS was calculated on a pixel by pixel basis using MODIS/Terra Snow Cover 8-Day L3 Global 500m Grid, Collection 6 obtained from the National Snow and Ice Data Center (NSIDC). Spatial coverage is for MODIS tiles h08v04, h08v05, h09v04, h09v05, and h10v04 for water years 2001 - 2015. Files are provided in the "USA Contiguous Albers Equal Area Conic USGS" projection. Funding provided by NSF grant EAR-1446870.

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ABSTRACT:

Here I provide water year discharge (Q) and precipitation (P) in units of mm as well as the water year runoff ratio (Q/P) for all reference USGS watersheds as defined by the GAGES-II project (Falcone, 2011) for water years 1981 to 2016. Precipitation values were extracted from PRISM monthly totals for the "Recent years" 4 km gridded dataset, and discharge values come from summations of USGS daily mean streamflow values. The dataset contains Q, P, and Q/P data by watershed for 1,594 reference USGS watersheds.

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ABSTRACT:

Snow persistence (SP) or the snow cover index (SCI), is the fraction of time that snow is present on the ground for a defined period. No data index (NDI) is the fraction of time that there is no data, cloud, or sensor saturation for the same period. SP and NDI were calculated on a pixel by pixel basis using MODIS/Terra Snow Cover 8-Day L3 Global 500m Grid, Collection 5 obtained from the National Snow and Ice Data Center (NSIDC). We computed the 1 January – 3 July SP for each year as the fraction of 8-day MODIS images with snow present. The selected period brackets the temporal extent of peak snow accumulation to complete snow ablation in most parts of the western United States. Spatial coverage is for MODIS tiles h08v04, h08v05, h09v04, h09v05, and h10v04. The 3 July date is used because the 8-day MODIS image does not fall on the first of the month in this case. Files are provided in the "USA Contiguous Albers Equal Area Conic USGS" projection. File nomenclature follows the following structure: "MOD10A2_(SCI or NDI)_(Water year the values correspond to, ex. 2001)_eq_alb.tif." Funding provided by NSF grant EAR-1446870.

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 Contact

Resources
All 0
Collection 0
Composite Resource 0
Generic 0
Geographic Feature 0
Geographic Raster 0
HIS Referenced Time Series 0
Model Instance 0
Model Program 0
MODFLOW Model Instance Resource 0
Multidimensional (NetCDF) 0
Script Resource 0
SWAT Model Instance 0
Time Series 0
Web App 0
Generic Generic
MODIS MOD10A2 derived snow persistence and no data index for the western U.S.
Created: Feb. 7, 2017, 9:23 p.m.
Authors: John C. Hammond · Freddy A. Saavedra · Stephanie K. Kampf

ABSTRACT:

Snow persistence (SP) or the snow cover index (SCI), is the fraction of time that snow is present on the ground for a defined period. No data index (NDI) is the fraction of time that there is no data, cloud, or sensor saturation for the same period. SP and NDI were calculated on a pixel by pixel basis using MODIS/Terra Snow Cover 8-Day L3 Global 500m Grid, Collection 5 obtained from the National Snow and Ice Data Center (NSIDC). We computed the 1 January – 3 July SP for each year as the fraction of 8-day MODIS images with snow present. The selected period brackets the temporal extent of peak snow accumulation to complete snow ablation in most parts of the western United States. Spatial coverage is for MODIS tiles h08v04, h08v05, h09v04, h09v05, and h10v04. The 3 July date is used because the 8-day MODIS image does not fall on the first of the month in this case. Files are provided in the "USA Contiguous Albers Equal Area Conic USGS" projection. File nomenclature follows the following structure: "MOD10A2_(SCI or NDI)_(Water year the values correspond to, ex. 2001)_eq_alb.tif." Funding provided by NSF grant EAR-1446870.

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Generic Generic

ABSTRACT:

Here I provide water year discharge (Q) and precipitation (P) in units of mm as well as the water year runoff ratio (Q/P) for all reference USGS watersheds as defined by the GAGES-II project (Falcone, 2011) for water years 1981 to 2016. Precipitation values were extracted from PRISM monthly totals for the "Recent years" 4 km gridded dataset, and discharge values come from summations of USGS daily mean streamflow values. The dataset contains Q, P, and Q/P data by watershed for 1,594 reference USGS watersheds.

Show More
Generic Generic
MODIS MOD10A2 derived snow season for the western U.S.
Created: Aug. 23, 2017, 7:39 p.m.
Authors: John Hammond · Freddy Saavedra · Stephanie Kampf

ABSTRACT:

Snow season length (SS), reported in days, is the length of time that snow is present on the ground on an annual basis. It is determined by finding the first and last snow occurrence for any given year, and then finding the difference between these two dates. SS was calculated on a pixel by pixel basis using MODIS/Terra Snow Cover 8-Day L3 Global 500m Grid, Collection 6 obtained from the National Snow and Ice Data Center (NSIDC). Spatial coverage is for MODIS tiles h08v04, h08v05, h09v04, h09v05, and h10v04 for water years 2001 - 2015. Files are provided in the "USA Contiguous Albers Equal Area Conic USGS" projection. Funding provided by NSF grant EAR-1446870.

Show More
Generic Generic

ABSTRACT:

This resource is useful for characterizing the intermittence of snow, or how continuously it covers an area (as opposed to snow persistence which quantifies the fraction of time that snow is present for any location for a defined time period: https://www.hydroshare.org/resource/1c62269aa802467688d25540caf2467e/, or the snow season, which provides the first day of snow occurrence, last day of snow occurrence, and the length of time between the first and last day of snow occurrence per water year: https://www.hydroshare.org/resource/197adcdc76b34591bd78a811bf1dfbfe/).Snow intermittence (snow to no snow counts) for the western U.S. for water years 2001 - 2015 contains annual and mean annual raster datasets with the number of snow to no snow events. The events consist of any time that there was snow that was present and then followed by bare ground within 10 days of the original snow fall. Both MOD10A1 and MOD10A2 binary snow products were used resulting in annual and mean annual rasters at the daily (MOD10A1) and 8-day (MOD10A2) temporal resolutions. This product is primarily intended for areas with sparse vegetation, as dense vegetation obscures the binary snow classification used for the MOD10A1 and MOD10A2 V5 products. These grids are available at the original 500 m MODIS resolution.

Show More
Composite Resource Composite Resource

ABSTRACT:

Snow season length (SS), reported in days, is the length of time that snow is present on the ground on an annual basis. It is determined by finding the first and last snow occurrence for any given water year (Oct 1 - Sep 30 NH, Jan 1 - Dec 31 SH), and then finding the difference between these two dates. SS was calculated on a pixel by pixel basis using MODIS/Terra Snow Cover 8-Day L3 Global 500m Grid, Collection 6 obtained from the National Snow and Ice Data Center (NSIDC) for global calculation and MOD10A1 for US calculation. Spatial coverage is for MODIS tiles h08v04, h08v05, h09v04, h09v05, and h10v04 for water years 2001 - 2015. Files are provided in the "USA Contiguous Albers Equal Area Conic USGS" projection. Funding provided by NSF grant EAR-1446870.

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