vers 1.8
version 1.7: * Hare’s metabolic cost function and
Eastman’s abstract cost function added (the number of implemented cost
functions is now 25); * facility to take into account barriers (i.e.,
areas where the movement is inhibited) added to all the functions
(‘movealloc()’ excluded); * ‘movecost()’ now returns the conductance
TransitionalLayer; this is instrumental to the internal optimisation of
the ‘movenetw()’ function; * the ‘movenetw()’ now also calculates LCPs
network between pairs of neighboring locations; * the ‘movenetw()’
function now returns a matrix reporting the cost incurred when moving
between all the locations pair-wisely; * internal optimisation of the
‘movenetw()’ function, which is now about 3 times faster than in
ver.1.6; * ‘oneplot’ parameter dropped from the ‘movenetw()’ function; *
fix to an error to the export facility in the ‘movenetw()’ function; *
fixes, improvements, and updates to the help documentation; * link to
the package’s vignette added to the help documentation of all the
implemented functions.
version 1.6: * fix to a projection issue in the in-built
‘volc’ raster dataset; * internal optimizations in the ‘movenetw()’
function; * improvements layout- and content-wise to the functions’ help
documentation.
version 1.5: * ‘movenetw()’: fix to an error in the way
the exported GeoTiff files were given a name. * minor adjustements and
amendements to the help documentation of ‘movenetw()’. * ‘volc’
RasterLayer added to the body of sample datasets.
version 1.4: * The ‘movecomp()’ and ‘movenetw()
functions have been added. * Cost functions added: Minetti et al.’s,
Marin Arroyo’s, Ardigo et al.’s, Pandolf et al.’s with correction factor
(the total number of implemented functions is now 23). * The option has
been added to ’movebound()’ to calculate the perimeter and area enclosed
by each cost-limit boundary. * Help documentions updated accordingly and
improved layout-wise.
version 1.3: * The ‘movealloc()’ function has been
added. * Kondo-Seino’s modified Tobler hiking function added. * The
Pandolf et al. and Van Leusen’s cost functions can now internally work
out the walking speed on the basis of the Tobler function (on-path
hiking); to achieve this, the user has to simply set the V parameter to
0. * Help documentation updated accordingly. * In the corridor raster
produced by ‘movecorr()’, when multiple origins are used, the point
locations are now plotted on top of the rendered plot.
version 1.2: * ‘movebound()’ function added. * In the
plots rendered by ‘movecost()’ and ‘movecorr()’, the accumulated cost
surface, the DTM, and the least-cost corridor are overlaid by a
hillshade raster to better convey the features of the terrain; the
transparency of the hillshade can be adjusted using the ‘transp’
parameter. * In the plot showing the least-cost path(s) rendered by
‘movecost()’, destination locations’ label(s) shows time in sexagesimal
numbers (hours, minutes, seconds). * The destination location layer
(‘dest.loc.w.cost’) returned by ‘movecost()’ is now included in the
layers than can be exported using the ‘export’ parameter. * In the
destination location layer (‘dest.loc.w.cost’) returned by ‘movecost()’,
when the cost is expressed in terms of time, a new variable (‘cost_hms’)
is added (besides ‘cost’) expressing time in sexagesimal numbers. The
variable ‘cost’ still stores the cost at the destination location(s),
but it is expressed in decimal numbers. * Minor adjustments to the
subtitle of the plot rendered by ‘movecorr()’ to indicate the used
terrain factor. * Minor adjustments to the annotations of the LCP plot
rendered by ‘movecost()’. * Minor edits and amendements to the help
documentation of ‘movecost()’ function.
version 1.1: * Fix to an error in the Bellavia’s cost
function, which has been introduced in ver 1.0. * The use of a terrain
factor (N) has been extended to almost all the implemented cost
functions; help documentation updated accordingly. * Minor adjustements
to the returned plots to indicate the value of the used terrain factor.
* Improvements to the content and layout of the ’movecost()’s help
documentation.
version 1.0: * The option to calculate and plot the LCPs
back to the origin has been added to ‘movecost()’. * The following cost
functions have been implemented in ‘movecost()’ (and, consequently, in
‘movecorr()’): Garmy, Kaddouri, Rozenblat, and Schneider’s; Rees’;
Bellavia’s. The total number of the implemented cost functions is now
eighteen. * Help documentation updated accordingly, with bibliographical
references for the new cost fucntions added. * Minor amendements and
improvements to some of the labels attached to the returned plots.
version 0.9: * The ‘movecorr()’ function now can produce
either a least-cost corridor between two locations, or corridors between
multiple locations. * The option has been added to ‘movecorr()’ to
rescale the least-cost values in the output raster to be constrained
between 0 and 1. * The ficility to use the so-called ‘cognitive slope’
in place of the true slope has been added to ‘movecost()’ and
‘movecorr()’.
version 0.8: * A bug has been fixed that prevented the
downloaded DTM to be returned in the list provided by the ‘movecorr()’
function. * The option to customize the labels attached to the point
locations on the output map has been added to ‘movecorr()’. *
‘movecorr()’ now optionally exports the DTM (if not provided by the user
but acquired online), the two LCPs, and the accumulated cost surfaces
around a and b. * The accumulated cost rasters (around point a and
around point b) are now returned by ‘movecorr()’. * The cost-surface is
now returned (but not plotted) by ‘movecost()’. * Minor internal
optimizations. * Minor amendements and improvements to the help
documentation.
version 0.7: Function ‘movecorr()’ added. In the
‘movecost()’ function, the option has been added to have the function
producing or not a graphical output (via the ‘graph.out’parameter).The
Marquez-Perez et al.’s modified Tobler’s function has been renamed for
consistency with the names given to the other functions: from ’mt’
(which was standing for “modified Tobler”“) to ‘mp’ (which stands
for”Marquez-Perez”“).
version 0.6: The facility to download online elevation
data (when an input DTM is not provided) has been added; it relies on
the ‘elevatr’ package. Three new datasets (to be used to showcase the
added functionality) have been added. Help documentation updated
accordingly.
version 0.5: Irmischer-Clarke’s modified Tobler hiking
functions for female added. This entailed modifying the name of the
parameters as follows: icmonp for on-path male,
icmoffp for off-path male, icfonp for on-path
female, icfoffp for off-path female. Minor improvements to
the layout of the help documentation.
version 0.4: Parameter move added, which
provides the option to set the number of directions in which cells are
connected in the cost calculation.
version 0.3: added cost functions: Llobera-Sluckin’s
metabolic energy expenditure; Alberti’s Tobler hiking function modified
for animal foraging excursions.
version 0.2: unlike the previous version, the cost
calculation is not based on a slope raster (in degrees) derived from the
input dtm; instead, the procedure described in van Etten, “R Package
gdistance: Distances and Routes on Geographical Grids” in Journal of
Statistical Software 76(13), 2017, pp. 14-15 is followed. The
altitudinal difference between dtm cells is first calculated and then
divided by cell centres distance, so obtaining slope values (expressed
as rise over run) changing according to the direction of movement. This
has the important implication that the implemented cost functions are
now truly anisotropic. The color ramp of the output accumulated cost
raster has been changed.
version 0.1: first release to CRAN.