road_proximity_sample: Road Proximity Sample

In essatech/wsep.t2: WSEP Tier 2

Road Proximity Sample

Description

Road Proximity Sample for Site Type B

Usage

road_proximity_sample(
  n = 20,
  strm = NA,
  roads = NA,
  buffer_s1_m = 20,
  buffer_s2_m = 40,
  buffer_crossings_m = 100,
  small_strm_segment_m = 50,
  stream_order = "STREAM_ORDER"
)

Arguments

n	Sample size n for each stratum. Defaults to 20.
strm	A streamline data set of class sf from the BCFWA. Run utm_projection() first to ensure projection is in meters.
roads	A road network data set of class sf. Run utm_projection() first to ensure projection is in meters.
buffer_s1_m	Numeric. Buffer size (in meters) for Strata 1 streams < 3rd order. Defaults to 20 m.
buffer_s2_m	Numeric. Buffer size (in meters) for Strata 2 streams >= 3rd order. Defaults to 40 m.
buffer_crossings_m	Numeric. Exclusion buffer size (in meters) to stream-road crossings to exclude sample sites from Site Type A. Defaults to 100 m.
small_strm_segment_m	Numeric. Remove small stream-road buffered segments unless they are near a switch-back (determined manually and added at end). Default small segment size is set to 50 m.
stream_order	String. Column name for stream order. Defaults to STREAM_ORDER. Rename as needed.

Details

WSEP Tier II Road Proximity Sample for Site Type B

• Apply a buffer (20m for < 3rd order and 40 m for ≥ 3rd order) streams.

• Taking the intersection of roads and this buffer

• Removing any stream crossings (Site Type A), by excluding any cases within 100 m of a crossing to avoid double counting

• Removing any segments < 50m in length unless they are near a switch-back (determined by manual review of the map). Switch-back determination is an optional manual step not automated in R code

• Providing the start point of the segment as well as the segment length and strata id (< 3rd order vs. ≥ 3rd order) and mapping the entire segment on the field maps to facilitate sampling

• Generate a random sample from the Site Type B list the strata with < 3rd order streams

• Append the complete list of Site Type B from the ≥ 3rd order strata

• Create a field checklist with at least the following fields: unique identifier (e.g., WatershedName_SD_B_001), coordinates of start point and end point, segment length, and Strata

Note that there is no repeat sampling or replacement. If the sample size n exceeds the number of segments available for a stratum, then only the limited number of available locations will be returned.

Value

A object of class sf of sample features representing sample sites.

essatech/wsep.t2 documentation built on Sept. 3, 2022, 5:56 a.m.