/* DATA DESCRIPTION: Citation: Shen, Longzhu; Amatulli, Giuseppe; Sethi, Tushar; Raymond, Peter; Domisch, Sami (2019): Estimating nitrogen and phosphorus concentrations in streams and rivers across the Contiguous United States. PANGAEA, https://doi.org/10.1594/PANGAEA.899168, Supplement to: Shen, L et al. (accepted): Estimating nitrogen and phosphorus concentrations in streams and rivers, within a machine learning framework. Scientific Data Abstract: Nitrogen (N) and Phosphorus (P) are essential nutritional elements for life processes in water bodies. However, in excessive quantities, they may represent a significant source of aquatic pollution. Eutrophication has become a widespread issue rising from a chemical nutrient imbalance and is largely attributed to anthropogenic activities. In view of this phenomenon, we present a new geo-dataset to estimate and map the concentrations of N and P in their various chemical forms at a spatial resolution of 30 arc-second (~1 km) for the conterminous US. The models were built using Random Forest (RF), a machine learning algorithm that regressed the seasonally measured N and P concentrations collected at 62,495 stations across the US streams for the period of 1994-2018 onto a set of 47 in-house built environmental variables that are available at a near-global extent. The seasonal models were validated through internal and external validation procedures and the predictive powers measured by Pearson Coefficients reached approximately 0.66 on average. Keyword(s): freshwater nutrients; machine learning; nitrogen; Phosphorus; stream network; water quality Original version: Estimating nitrogen and phosphorus concentrations in streams and rivers across the Contiguous United States, Version 1 (2019) (URI: https://hs.pangaea.de/Maps/USA_streams_N-P/Amatulli_2019_V1.zip) Coverage: MEDIAN LATITUDE: 37.950000 * MEDIAN LONGITUDE: -102.300000 * SOUTH-BOUND LATITUDE: 27.700000 * WEST-BOUND LONGITUDE: -123.800000 * NORTH-BOUND LATITUDE: 48.200000 * EAST-BOUND LONGITUDE: -80.800000 Event(s): USA_cont * LATITUDE START: 48.200000 * LONGITUDE START: -123.800000 * LATITUDE END: 27.700000 * LONGITUDE END: -80.800000 * LOCATION: United States of America Comment: Updated version, 2020-03-04. Parameter(s): File content (Content) * PI: Amatulli, Giuseppe (https://orcid.org/0000-0002-8341-2830, giuseppe.amatulli@gmail.com, https://environment.yale.edu/profile/giuseppe-amatulli/) File name (File name) * PI: Amatulli, Giuseppe (https://orcid.org/0000-0002-8341-2830, giuseppe.amatulli@gmail.com, https://environment.yale.edu/profile/giuseppe-amatulli/) File format (File format) * PI: Amatulli, Giuseppe (https://orcid.org/0000-0002-8341-2830, giuseppe.amatulli@gmail.com, https://environment.yale.edu/profile/giuseppe-amatulli/) File size [kByte] (File size) * PI: Amatulli, Giuseppe (https://orcid.org/0000-0002-8341-2830, giuseppe.amatulli@gmail.com, https://environment.yale.edu/profile/giuseppe-amatulli/) Uniform resource locator/link to file (URL file) * PI: Amatulli, Giuseppe (https://orcid.org/0000-0002-8341-2830, giuseppe.amatulli@gmail.com, https://environment.yale.edu/profile/giuseppe-amatulli/) License: Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/) Size: 100 data points */ Content File name File format File size [kByte] URL file Nitrate autumn NO3_1KM_autumn.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/NO3_1KM_autumn.tif Nitrate spring NO3_1KM_spring.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/NO3_1KM_spring.tif Nitrate summer NO3_1KM_summer.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/NO3_1KM_summer.tif Nitrate winter NO3_1KM_winter.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/NO3_1KM_winter.tif Total dissolved nitrogen autumn TDN_1KM_autumn.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TDN_1KM_autumn.tif Total dissolved nitrogen spring TDN_1KM_spring.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TDN_1KM_spring.tif Total dissolved nitrogen summer TDN_1KM_summer.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TDN_1KM_summer.tif Total dissolved nitrogen winter TDN_1KM_winter.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TDN_1KM_winter.tif Total dissolved phosphorus autumn TDP_1KM_autumn.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TDP_1KM_autumn.tif Total dissolved phosphorus spring TDP_1KM_spring.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TDP_1KM_spring.tif Total dissolved phosphorus summer TDP_1KM_summer.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TDP_1KM_summer.tif Total dissolved phosphorus winter TDP_1KM_winter.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TDP_1KM_winter.tif Total nitrogen autumn TN_1KM_autumn.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TN_1KM_autumn.tif Total nitrogen spring TN_1KM_spring.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TN_1KM_spring.tif Total nitrogen summer TN_1KM_summer.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TN_1KM_summer.tif Total nitrogen winter TN_1KM_winter.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TN_1KM_winter.tif Total phosphorus autumn TP_1KM_autumn.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TP_1KM_autumn.tif Total phosphorus spring TP_1KM_spring.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TP_1KM_spring.tif Total phosphorus summer TP_1KM_summer.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TP_1KM_summer.tif Total phosphorus winter TP_1KM_winter.tif TIF 89237.479 https://hs.pangaea.de/Maps/USA_streams_N-P/TP_1KM_winter.tif