spsurvey (version 3.4)

NRSA_2009: Western Mountains Ecoregion Rivers and Streams in the EPA National Rivers and Streams Assessment (NRSA) for 2004 and 2008-2009

Description

A data frame containing attributes for rivers and streams sampled by the EPA National Rivers and Streams Assessment (NRSA) in the Western Mountains Ecoregion during 2004 and 2008-2009.

Usage

data(NRSA_2009)

Format

A data frame with 668 rows and the following 13 columns:

siteID

site ID value.

xcoord

Albers projection x-coordinate.

ycoord

Albers projection y-coordinate.

wgt

survey design weight.

Survey

survey identifier, which is either WSA or NRSA.

Revisit_Site

identifier of revisit sites for the two surveys, where Y = a revisit site and N = not a revisit site.

Stream_Size

stream size category, which is either large or small.

NTL

total nitrogen concentration.

PTL

total phosphorus concentration.

Benthic_MMI

value of the benthic macroinvertebrate multimetric index (MMI).

NTL_Cond

condition class category of the total nitrogen value.

PTL_Cond

condition class category of the total phosphorus value.

Benthic_MMI_Cond

condition class category of the benthic MMI value.

Examples

# NOT RUN {
data(NRSA_2009)
head(NRSA_2009)
# }