Fixed Atlas bug by setting precision in Atlas environment when
invalid shapes are detected.
Enhancements
Enhanced message regarding strata names when they are provided but
do not match the number of strata.
dssd 1.0.1
Bug Fixes
Removed dependence on rgdal
dssd 1.0.0
Bug Fixes
Now accepts XYZ and XYM polygons (the Z and M information is removed
when the region is created)
dssd 0.3.4
Enhancements
Can store design parameters associated with segmented trackline
design for use with Distance for Windows (cannot generate transects for
this design within dssd)
Now checks shapefiles for LinkID ordering if being used by Distance
for Windows
dssd 0.3.3
Enhancements
Minor change to retain on CRAN and pass noLD testing
dssd 0.3.2
Enhancements
Changed the default truncation distance to 50
Remove dependency on 3Dplot (and therefore tcltk package)
Minor code changes inline with CRAN coding policies
dssd 0.3.1
Bug Fixes
Minor fix as dssd was erroneously displaying a warning about
possible unequal coverage when only a total number of samplers was
supplied. This was not always applicable.
dssd 0.3.0
New Features
calculate.effort: calculates the estimated effort required in the
main survey to achieve a given CV based on information from a pilot
survey.
Improved plotting using ggplot2.
Added an example as to how to export transects to the Getting
Started vignette.
Improved effort allocation documentation.
Bug Fixes
Clarified in documentation and via warnings and error messages when
there was confusion in the specification of designs.
Fixed effort allocation when there is a mix of random and systematic
point transect designs and the design parameter supplied is the total
number of samplers.
Fixed effort allocation rounding when the total number of samplers
is supplied for line transect designs. Previously it wasn’t rounded so
it automatically used the floor value which results in less transects
than requested.
Fixed segmented transect bug which generated an error when segment
id’s were not sequential (sometimes happens after clipping and not
retaining all transects)
dssd 0.2.2
Exports the region class which is required for dsims
dssd 0.2.1
Bug Fixes
Minor documentation and import changes to pass CRAN checks
dssd 0.2.0
New Features
Segmented grid design
Writes transects to gpx, csv and txt file
Multi-strata vignette
Coverage score statistics by stratum
Option to run coverage simulation without progress counter
output
Plot and access coverage scores by stratum
Use -1 to set a randomly generated design angle
Updated Documentation
Bug Fixes
Coordinate reference systems now stored in coverage and transect
objects
Fixed invalid shapefiles: AreaRStrata and AreaRProjStrata
dssd 0.1.0
Enhancements
Introducing the new Distance Sampling Survey Design package! We
provide a number of survey design options which allow you to generate
transects for distance sampling surveys.
Point transects: Simple random sampling
Point transects: Systematic grid with random start point
Line transects: Parallel random lines
Line transects: Systematic parallel lines with a random start
Line transects: Equal spaced zigzags with a random start
Line transects: Equal spaced zigzags with complementary set of
zigzags
Ability to vary design angle
Survey generation by number of samplers, spacing or line length (can
generate by different criteria in each strata)
Ability to use different designs in each strata (as long as they are
of the same type, i.e. all point or all line transects)
Generate plus or minus sampling surveys
Generate zigzag design inside minimum bounding rectangles (angled
along the design axis) or convex hulls
Calculates the coverage of different design by simulation
Produces summary statistics from the coverage design showing the
variability in number of samplers, line length, % coverage across
surveys from a given design