irsarea

Name of the input shapefile. If shapefilename equals
NULL, then the shapefile or shapefiles in the working directory are used.
The default is NULL.

shapefilename

Data frame containing id, mdcaty, area, and mdm.

areaframe

Number of points to select in the sample. The default is
100.

samplesize

First number to start siteID numbering. The default is 1.

SiteBegin

Maximum number of iterations for randomly generating a point
within the frame to select a site when type.frame equals "area". The
default is 1000.

maxtry

This function selects an IRS of an area resource.

survey

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

irsarea function

<dl class="dl-horizontal">
 <dt><code>getRecordIDs</code></dt><dd>C function to obtain the shapefile
 record IDs for records from which sample points will be selected</dd>
 <dt><code>getShapeBox</code></dt><dd>C function to obtain the shapefile
 minimum and maximum values for the x and y coordinates</dd>
 <dt><code>pointInPolygonFile</code></dt><dd>C function to determine the
 polygon IDs and the probability values associated with a set of point,
 where polygons are specified by a shapefile</dd>
 </dl>

irsarea: Select an Independent Random Sample (IRS) of an Area Resource

Description

Usage

Arguments

Value

Other Functions Required