An example data set for estimating fatalities from a trough-based solar thermal electric power generation facility. The simulated site is inspected daily along ten 2000 meter long transects, which run north-south. Observers look up to 150 meters away down the rows created by troughs (east-west). One sided distance sampling will be used, with observers looking consistently in one cardinal direction as they travel through the facility. A sitewide clearout search is implemented before the first scheduled winter search.
The dataset consists of five parts: Data on carcass observations (CO) from daily searches, field trials for estimating carcass persistence (CP) and searcher efficiency (SE), search schedule (SS), and density weighted proportion (DWP) of area searched for the rows within each transect (which is an area adjustment factor to account for incomplete search coverage).
solar_troughsolar_trough is a list with 5 elements:
SESearcher efficiency trial data
CPCarcass persistence trial data
SSSearch schedule parameters
DWPDensity weighted proportion of area searched
COCarcass observations
$SE is a data frame with each row representing the fate of a single
carcass in the searcher efficiency trials. There are columns for:
Season"winter", "spring", "summer", or
"fall"
Size"bat"; or "lrg", "med", or
"sml" bird
"Search1",...,"Search5"fate of carcass on the 1st, 2nd, 3rd,
4th, and 5th search after placement. A value of 1 implies that a carcass
was discovered by searchers, 0 implies the carcass was present but not
discovered, and any other value is interpreted as "no search" or
"carcass not present" and ignored in the model. In this data set,
NA indicates that a carcass had been previously discovered and
removed from the field. A user may use a variety of values to
differentiate different reasons no search was conducted or the carcass
was not present. For example, "NS" to indicate the search
was not scheduled in that location at that time, or "SC" to indicate the
carcass had been removed by scavengers prior to the search.
Distancethe distance a carcass was placed from the observer's transect.
$CP is a data frame with each row representing the fate of a single
carcass in the carcass persistence trials. There are columns for:
Indexunique ID for each carcass
Season"winter", "spring", "summer", or
"fall"
Size"bat"; or "lrg", "med", or
"sml" bird
LastPresent, FirstAbsentendpoints of the interval bracketing the
time the carcass was scavenged or otherwise removed from the field. For
example, LastPresent = 2.04, FirstAbsent = 3.21 indicates that the carcass
was last observed 2.04 days after being placed in the field and was noted
missing 3.21 days after being placed. If the precise time of carcass
removal is known (e.g., recorded by camera), then LastPresent and
FirstAbsent should be set equal to each other. If a carcass persists
beyond the last day of the field trial, LastPresent is the last time it was
observed and FirstAbsent is entered as Inf or NA.
$SS is a data frame with a row for each date a transect at the site
was searched, a column of SearchDates, and a column for each
transect. In addition, there is an optional column to indicate the
Season. The columns for distinct area (array) and the date column
are required, and the names of the columns for search areas must match the
names of areas used in the DWP and CO files.
SearchDatecolumns of dates when a transect was searched.
Format in this data is "%Y-%m-%d CDT", but time zone (CDT)
is optional. A time stamp may be included if desired (e.g.,
2018-03-20 02:15:41). Alternatively, \ can be used in
place of -.
Season"winter", "spring", "summer", or
"fall" to indicate which season the search was conducted in.
Season is optional but may be used as a temporal covariate for
fatality estimates.
$DWP is a data frame with a row for each transect and columns for
each carcass size class (labels must match those of the class factors in the
carcass observation file). Values represent the density-weighted proportion
of the searched area for each size (or the fractionof carcasses that fall
in the searched area). Since the whole site was searched, DWP is uniformly
set equal to 1.
Unitunique ID for each transect. IDs match those used in
the $CO data frame and the column names in the $SS data.
batDWP associated with size class Bat
smlDWP associated with size class Small
medDWP associated with size class Medium
lrgDWP associated with size class Large
$CO is a data frame with a row for carcass observed in the carcass
searches and a number of columns giving information about the given carcass
(date found, size, species, etc.)
Indexunique identifier for each carcass.
Unitidentifier for which transect the given carcass was found at. Values must match with DWP Transect values Search Schedule column names.
Speciesspecies of the carcass: "BA", "BB",
"BC", "BD", "BE", "LA", "LB",
"LD", "LE", "MA", "MB", "SA",
"SB", "SC", "SD", "SE", "SF",
"SG"
Sizesize: "bat", "lrg", "med",
"sml"
RowOptional indicator of which row within an array a carcass was found at.
DistanceThe perpendicular distance from the searcher's transect at which the carcass was discovered at.
DateFounddates entered in the same format as in
$SS$SearchDate.
Every date entered here is (and must be) included in the search schedule
($SS$SearchDate)
XUTM Easting of carcass.
YUTM Northing of carcass.