sample_existing_strat

This function takes a data frame of existing data, a data frame of desired sample sizes
for each strata, the number of samples to take, and optionally a file name and overwrite
parameter. It returns a sample of the existing data based on the desired sample sizes for
each strata, and optionally writes the resulting samples to a file.

internal

Structurally guided sampling (SGS) approaches for airborne laser scanning (ALS; LIDAR). Primary functions provide means
to generate data-driven stratifications & methods for allocating samples. Intermediate functions for calculating and extracting important information
about input covariates and samples are also included. Processing outcomes are intended to help forest and environmental management
practitioners better optimize field sample placement as well as assess and augment existing sample networks in the context of data
distributions and conditions. ALS data is the primary intended use case, however any rasterized remote sensing data can be used,
enabling data-driven stratifications and sampling approaches.

Tristan RH Goodbody

sgsR

Structurally Guided Sampling

Nicholas C Coops

Martin Queinnec

sample_existing_strat function

<dl><dt>existing</dt>
<dd>sf 'POINT'. Existing plot network.</dd>
<dt>toSample</dt>
<dd>A data frame specifying the desired sample sizes for each strata.</dd>
<dt>nSamp</dt>
<dd>Numeric. Number of desired samples. <code>existing</code>, <code>include</code> and <code>force</code> influence this value.</dd>
<dt>filename</dt>
<dd>Character. Path to write output samples.</dd>
<dt>overwrite</dt>
<dd>Logical. Choice to overwrite existing <code>filename</code> if it exists.</dd></dl>

Arguments

Sample Existing Data Based on Strata — sample_existing_strat

<dl>

<dt>existing</dt>
<dd>sf 'POINT'. Existing plot network.</dd>


<dt>toSample</dt>
<dd>A data frame specifying the desired sample sizes for each strata.</dd>


<dt>nSamp</dt>
<dd>Numeric. Number of desired samples. <code>existing</code>, <code>include</code> and <code>force</code> influence this value.</dd>


<dt>filename</dt>
<dd>Character. Path to write output samples.</dd>


<dt>overwrite</dt>
<dd>Logical. Choice to overwrite existing <code>filename</code> if it exists.</dd>

</dl>

sample_existing_strat: Sample Existing Data Based on Strata

Description

Usage

Value

Arguments