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Early Estimates of Herbaceous Annual Cover in the Sagebrush Ecosystem (May 1, 2019)

Dates

Publication Date
Time Period
2019-05-01

Citation

Boyte, S.P., and Wylie, B.K., 2019, Early Estimates of Herbaceous Annual Cover in the Sagebrush Ecosystem (May 1, 2019): U.S. Geological Survey data release, https://doi.org/10.5066/P9ZEK5M1.

Summary

The dataset provides a spatially explicit estimate of 2019 herbaceous annual percent cover predicted on May 1st with an emphasis on annual grasses. The estimate is based on the mean output of two regression-tree models. For one model, we include, as an independent variable amongst other independent variables, a dataset that is the mean of 17-years of annual herbaceous percent cover (https://doi.org/10.5066/F71J98QK). This model's test mean error rate (n = 1670), based on nine different randomizations, equals 4.9% with a standard deviation of +/- 0.15. A second model was developed that did not include the mean of 17-years of annual herbaceous percent cover, and this model's test mean error rate (n = 1670), based on nine different randomizations, [...]

Contacts

Point of Contact :
Stephen P Boyte
Originator :
Stephen P Boyte, Bruce K Wylie
Metadata Contact :
Stephen P Boyte
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
SDC Data Owner :
Earth Resources Observation and Science (EROS) Center
USGS Mission Area :
Land Resources

Attached Files

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2019NRT_annherb_May01.jpg
“Map”
thumbnail 7.35 MB image/jpeg
NRT_annherb_2019May01.img
“Dataset”
20.53 MB application/unknown
Extension: NRT_annherb_2019May01_wgs84.zip
NRT_annherb_2019May01_wgs84.tfw 97 Bytes
NRT_annherb_2019May01_wgs84.tif 9.99 MB
NRT_annherb_2019May01_wgs84.tif.aux.xml 1.45 KB
NRT_annherb_2019May01_wgs84.tif.clr 1.37 KB
NRT_annherb_2019May01_wgs84.tif.ovr thumbnail 4.01 MB
NRT_annherb_2019May01_wgs84.tif.vat.cpg 5 Bytes
NRT_annherb_2019May01_wgs84.tif.vat.dbf 7.6 KB
NRT_annherb_2019May01_wgs84.tif.vat.dbf.xml 532 Bytes

Purpose

These data were developed to provide land managers and researchers with early-season, near-real-time predictions of spatially explicit percent cover predictions of herbaceous annual vegetation in the study area. Appropriate use of the data should be defined by the user; however, this data comes with several caveats. First, as an early-season dataset, it will not reflect the end-of-season estimated percent cover of annual grass in many areas. In fact, some areas with annual grass cover will reflect no cover at this early date. Second, these estimates should be viewed as relative abundances. Third, each pixel in the dataset represent 250-meters and can include a geolocation error of up to 125 meters. Comparing this dataset to similar datasets with different spatial resolutions can lead to substantial differences between datasets. Fourth, this dataset represents annual herbaceous percent cover for 2019 forecast on May 1. This dataset is a forecast, and mapping could improve with later map development dates (e.g., July 1). This forecast is considered accurate and reasonable given this early season of mapping.
Map
Map

Map

Spatial Services

ScienceBase WMS

ScienceBase WCS

Communities

  • USGS Data Release Products

Associated Items

Tags

Provenance

July 26, 2019 GeoTIFF and Web Coverage Service added to data release. Please note the GeoTIFF is in a different projection than the IMG file.

Additional Information

Identifiers

Type Scheme Key
DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/P9ZEK5M1

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