sbcsamp

The sp package object of class "SpatialPointsDataFrame"
produced by the grts or irs functions that contains survey design
information.

sp.sample

The object created by the sbcframe function. The default is
NULL.

sbc.frame

Grid cell x-coordinate increment value. The default is NULL.

Grid cell y-coordinate increment value. The default is NULL.

Vector of grid cell x-coordinates. The default is NULL.

Vector of grid cell y-coordinates. The default is NULL.

This function calculates spatial balance grid cell extent and proportions
for a survey design. The user must provide either sbc.frame or values for
dx, dy, xc, and yc.

These functions provide procedures for selecting sites for spatial
surveys using spatially balanced algorithms applied to discrete points,
linear networks, or polygons. The probability survey designs available
include independent random samples, stratified random samples, and unequal
probability random samples (categorical or probability proportional to
size). Design-based estimation based on the results from surveys is
available for estimating totals, means, quantiles, CDFs, and linear models.
The analyses rely on package survey for most results. Variance estimation
options include a local neighborhood variance estimator that is appropriate
for spatially-balanced survey designs. A reference for the survey design
portion of the package is: D. L. Stevens, Jr. and A. R. Olsen (2004),
"Spatially-balanced sampling of natural resources.", Journal of the American
Statistical Association 99(465): 262-278, <DOI:10.1198/016214504000000250>.
Additional helpful references for this package are A. R. Olsen, T. M.
Kincaid, and Q. Payton (2012) and T. M. Kincaid and A. R. Olsen (2012), both
of which are chapters in the book "Design and Analysis of Long-Term
Ecological Monitoring Studies" (R. A. Gitzen, J. J. Millspaugh, A. B.
Cooper, and D. S. Licht (eds.), Cambridge University Press, New York,
<Online ISBN:9781139022422>).

Tom Kincaid

spsurvey

Spatial Survey Design and Analysis

Tony Olsen

Don Stevens

Christian Platt

Denis White

Richard Remington

sbcsamp function

<dl class="dl-horizontal">
 <dt><code>readShapeFilePts</code></dt><dd>C function to read the shp file of
 a point shapefile and return a data frame containing the x-coordinates
 and y-coordinates for elements in the frame</dd>
 <dt><code><a rd-options="" href="/link/cell.wt?package=spsurvey&version=4.0.0" data-mini-rdoc="spsurvey::cell.wt">cell.wt</a></code></dt><dd>calculates number of points in a cell for a
 points object</dd>
 </dl>

sbcsamp: Calculate Spatial Balance Grid Cell Extent and Proportions for a Survey Design

Description

Usage

Arguments

Value

Other Functions Required