Software en ru 
The software LandLord is
developed for digital terrain modelling. Initial
data are digital elevation models (DEMs) based on plane
square grids or spheroidal equal angular grids. The
software LandLord 4.0 allows one to carry out the following procedures: ·
Derivation of digital models of local
topographic attributes. Four methods can be used to process DEMs given by a
plane square grid: the Evans–Young method, the Zevenbergen–Thorne
method, the Shary method, and the author’s method. Another
author's method
can be used to derive partial derivatives from DEMs given by a spheroidal
equal angular grid. The following morphometric characteristics describing
local topography can be calculated: §
All variables of the complete system of curvatures: horizontal curvature,
vertical curvature, mean curvature, Gaussian curvature, accumulation curvature, ring curvature, unsphericity curvature, difference curvature, minimal curvature, maximal curvature, horizontal excess curvature, and vertical excess curvature. §
Other local
morphometric variables, such as slope gradient, slope aspect, rotor, and others. §
Solar
morphometric variables: insolation
and reflectance. §
Models of
landscape classification using the
concept of accumulation, transit and
dissipation zones, the Efremov–Krho model, and others. ·
Derivation of digital models of nonlocal topographic
attributes. The Martz–De Jong method is used to process DEMs given by a
plane square grid. This method adapted to the geometry of the convex
spheroidal equal angular grid is used to process DEMs given by a spheroidal
equal angular grid. The following geomorphometric characteristics describing
regional topography can be calculated: §
Minimal and maximal catchment area. §
Minimal and maximal dispersive area. §
Minimal and maximal topographic index. §
Minimal and maximal stream power index. ·
Smoothing of digital models given by
squarespaced and spheroidal trapezoidal grids: §
Weighted average smoothing using 3x3, 5x5, and 7x7 kernels. §
Calculating depressionfree DEMs by the Martz–De Jong
method. · Conventional
arithmetic procedures: addition, subtraction, multiplication, division,
logarithms, exponent, and Laplasian, as well as area and volume estimation. · Statistical
analysis: §
Derivation of linear regressionbased digital models of natural properties using topographic
attributes as independent variables in corresponding regression equations. §
Estimation of root mean square errors (RMSE) for all variables of
the complete system of curvatures as well as slope steepness, slope aspect,
plan curvature, rotor, and derivating function derived from DEMs given by
squarespaced and spheroidal trapezoidal grids. · Visualization
of DTMs using several colour and grey scales (examples can be found in publications). · Import
of Surfer binary files *.grd · Import
of quasiglobal
and global DEMs ETOPO1, ETOPO2, ETOPO5, GLOBO, GTOPO30, SRTM30,
SRTM30_PLUS, IBCAO, IBCSO, SRTM3, SRTM1, and ASTER GDEM archives, as well as
planetary DEMs from NASA PDS archives. · Export
of LandLord DTM files into plain text files, ArcInfo text files *.asc, and
Surfer binary files *.grd.
Availability and
distribution I do not distribute the software. A collaborative research
with a subsequent joint publication is the only possibility to use LandLord
4.0. For
details and examples, see:
