This respository contains a digitally transcribed copy
(nes_data.csv)
of the National Eutrophication Survey (NES) dataset. The original data
can be found in the archival_pdfs folder or by searching:
https://www.epa.gov/nscep
| variable name | description | units |
|---|---|---|
| pdf identifier (474 - 477) | integer | |
| pagenum | page number of the pdf | integer |
| storet_code | identifier which links measurement to coordinate locations | character |
| state | state where the water body resides | character |
| name | name of the water body | character |
| county | county where the water body resides | character |
| lake_type | natural or impoundment | character |
| drainage_area | the total drainage area | square kilometers |
| surface_area | the area of the water surface | sq km |
| mean_depth | the volume of the water body divided by the surface area in square meters | meters |
| total_inflow | the mean of the inflows of all tributaries and the immediate drainage | cubic meters per second |
| retention_time | a mean value determined by dividing the lake volume, in cubic meters, by the mean annual outflow in cubic meters per unit cof time | years or days |
| retention_time_units | the units of time for each retention entry | years or days |
| alkalinity | alkalinity | milligrams per liter |
| conductivity | conductivity | microohms |
| secchi | secchi | meters |
| tp | total phosphorus | milligrams per liter |
| po4 | orthophosphate | milligrams per liter |
| tin | total inorganic nitrogen | milligrams per liter |
| tn | total nitrogen | milligrams per liter |
| p_pnt_source_muni | municipal point source phosphorus loading | kilograms per year |
| p_pnt_source_industrial | industrial point source phosphorus loading | kilograms per year |
| p_pnt_source_septic | septic point source phosphorus loading | kilograms per year |
| p_nonpnt_source | nonpoint source phosphorus loading | kilograms per year |
| p_total | total phosphorus loading | kilograms per year |
| n_pnt_source_muni | municipal point source nitrogen loading | kilograms per year |
| n_pnt_source_industrial | industrial point source nitrogen loading | kilograms per year |
| n_pnt_source_septic | septic point source nitrogen loading | kilograms per year |
| n_nonpnt_source | nonpoint source nitrogen loading | kilograms per year |
| n_total | total nitrogen loading | kilograms per year |
| p_total_out | total phosphorus outlet load | kilograms per year |
| p_percent_retention | percent phosphorus retention | percent |
| p_surface_area_loading | phosphorus surface area loading | grams per square meter per year |
| n_total_out | total nitrogen outlet load | kilograms per year |
| n_percent_retention | percent nitrogen retention | percent |
| n_surface_area_loading | nitrogen surface area loading | grams per square meter per year |
| lat | latitude | decimal degrees |
| long | longitude | decimal degrees |
-
Use the nesR package to generate the files in /02_raw_data.
-
Hand check the files in /02_raw_data/merged_data against the pdfs in /01_archival_pdfs.
-
Combine files with 05_analysis_scripts/PDF_Merge.R.
We’ve combed the data to try and find all the transciption errors but it’s difficult to catch them all. If you find any errors please open an issue or submit a pull request against the files in /03_qa_data.
Stachelek, J., Ford, C., Kincaid, D., King, K., Miller, H. and Nagelkirk, R., 2018. The National Eutrophication Survey: lake characteristics and historical nutrient concentrations. Earth System Science Data, 10(1), pp.81-86. (https://doi.org/10.5194/essd-10-81-2018)
Stachelek, J. (2017). nesR: Scrape Data from National Eutrophication Survey archival PDFs. R package version 0.1. (https://github.com/jsta/nesR) (https://dx.doi.org/10.5281/zenodo.400258)
Stachelek, J. (2017). nesRdata: National Eutrophication Survey Data Package. R package version 0.1. https://github.com/jsta/nesRdata