“ChesBay 24k – LU": Land Use/Land Cover Related Data Summaries for the Chesapeake Bay Watershed Within NHD Plus HR catchments (ver. 2.0, October 2024)
Dates
Publication Date
2023-08-01
Start Date
2001
End Date
2021
Revision
2024-10-17
Citation
Gressler, B.P., Young, J.A., Gordon, S.E., Wieferich, D.J., Maloney, K.O., Woods, T.E., Emmons, S.C., Kiser, A.H., and Boyle, L.J., 2023, “ChesBay 24k – LU": Land Use/Land Cover Related Data Summaries for the Chesapeake Bay Watershed Within NHD Plus HR catchments (ver. 2.0, October 2024): U.S. Geological Survey data release, https://doi.org/10.5066/P95CMWEM.
Summary
These tabular data are the summarization of land use/land cover related variables within the Chesapeake Bay watershed using the xstrm methodology bringing these data to the 1:24,000 scale. Variables being counted as land use/land cover related include all land use and land cover data. This also contains datasets that are split off or combined from source data (eg. agriculture or impervious only datasets combined from agriculture or impervious land use/land cover classes). Outputs consist of tabular comma-separated values files (CSVs), and parquet formatted files for both the local catchment and network summaries linked to the National Hydrography Dataset Plus High-Resolution (NHDPlus HR) framework by NHDPlus ID. Local catchments are [...]
Summary
These tabular data are the summarization of land use/land cover related variables within the Chesapeake Bay watershed using the xstrm methodology bringing these data to the 1:24,000 scale. Variables being counted as land use/land cover related include all land use and land cover data. This also contains datasets that are split off or combined from source data (eg. agriculture or impervious only datasets combined from agriculture or impervious land use/land cover classes). Outputs consist of tabular comma-separated values files (CSVs), and parquet formatted files for both the local catchment and network summaries linked to the National Hydrography Dataset Plus High-Resolution (NHDPlus HR) framework by NHDPlus ID. Local catchments are defined as the single catchment the data is summarized within. Network accumulation summaries were completed for each of these catchments and their respective upstream catchments. The summarized data tables are structured as a single column representing the catchment id values (ie. nhdplusid) and the remaining columns consisting of the summarized variables. The downstream network summary type is not present within the dataset as no summaries were conducted using that summary type. Additionally, for a full description of the variables included within these summaries see xstrm_nhdhr_lulc_chesapeake_baywide_datadictionary.csv in the attached files.
The xstrm local summary methodology takes either raster or point data as input then summarizes those data by "zones" (hereafter referred to as catchment(s)), in this case the NHDPlus HR catchments. The network summaries then take the results from the local summaries and calculates the desired network summary statistic for the local catchment and its respective upstream or downstream catchments. As a note concerning use of these data, any rasters summarized within this process only had their cells included within a catchment if the center of the raster cell fell within the catchment boundary. However, the resolution of the input raster data for these summaries was considered to provide completely adequate coverage of the summary catchments using this option and given computing power limitations. If a confirmed complete coverage of a catchment is desired (even if a raster cell only is minimally included within the catchment) then it is recommended to rerun the xstrm summary process with the "All Touched" option set to True.
These data were updated in September of 2024 where several variables unnecessary to the use of the data summaries were removed, incorrectly calculated area variables and all dependent variables were corrected, and several new variables were added to the dataset. See xstrm_nhdhr_lulc_chesapeake_baywide_versionhistory.txt for further details.
Further information on the Xstrm summary process can be found at the Xstrm software release pages: Xstrm: Wieferich, D.J., Williams, B., Falgout, J.T., Foks, N.L. 2021. xstrm. U.S. Geological Survey software release. https://doi.org/10.5066/P9P8P7Z0. Xstrm Local: Wieferich, D.J., Gressler B., Krause K., Wieczorek M., McDonald, S. 2022. xstrm_local Version-1.1.0. U.S. Geological Survey software release. https://doi.org/10.5066/P98BOGI9.
Click on title to download individual files attached to this item.
xstrm_nhdhr_lulc_chesapeake_baywide_metadata.xml “Metadata” Original FGDC Metadata
View
31.83 KB
application/fgdc+xml
xstrm_nhdhr_lulc_chesapeake_baywide_datadictionary.csv “Data Dictionary of Xstrm Output Tables”
228.94 KB
text/csv
“Local Catchment Xstrm Summary Table in Parquet Format”
397.77 MB
application/octet-stream
“Local Catchment Xstrm Summary Table in CSV Format”
873.92 MB
text/csv
“Upstream Accumulation Xstrm Summary Table in Parquet Format”
612.15 MB
application/octet-stream
“Upstream Accumulation Xstrm Summary Table in CSV Format”
1.22 GB
text/csv
“Version History”
2.41 KB
text/plain
Purpose
Representing landscape data within hydrologic networks are a consistent aspect of work within aquatic biology. Commonly, these data are summarized to networks represented at a 1:100,000 scale which can provide issues for efforts requiring a much finer scale of analysis. Summarizing these data within the National Hydrography Dataset Plus High-Resolution framework brings the scale of these data to 1:24,000 which is much more representative of the hydrologic network than that more common 1:100,000 scale. This finer scale is also more meaningful for managers and others working at this finer level and the summarization within catchments creates a simple framework for compiling other sets of environmental data into a single structure. Additionally, xstrm calculates upstream and downstream accumulation for the variables which is an important metric when analyzing linear flow networks. A potential use for these data would be as input for studies or models that require a fine spatial scale to develop meaningful conclusions at the catchment and network level.
Revision 2.0 by Patrick H Young on October 17, 2024. To review the changes that were made, see “xstrm_nhdhr_lulc_chesapeake_baywide_versionhistory.txt” in the attached files section.
