Latitude/Longitude Triangle Grids on a Sphere

**SPHERE_LLT_GRID**
is a Python library which
uses longitudes and latitudes to create grids of points, lines,
and triangles
over the surface of a sphere in 3D.

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

**SPHERE_LLT_GRID** is available in
a C version and
a C++ version and
a FORTRAN77 version and
a FORTRAN90 version and
a MATLAB version and
a Python version.

BALL_GRID, a Python library which computes a grid of points over the interior of a ball in 3D.

CIRCLE_ARC_GRID, a Python program which computes points equally spaced along a circular arc;

CUBE_GRID, a Python library which computes a grid of points over the interior of a cube in 3D.

DISK_GRID, a Python library which computes a grid of points over the interior of a disk in 2D.

ELLIPSE_GRID, a Python library which computes a grid of points over the interior of an ellipse in 2D.

ELLIPSOID_GRID, a Python library which computes a grid of points over the interior of an ellipsoid in 3D.

HYPERCUBE_GRID, a Python library which computes a grid of points over the interior of a hypercube in M dimensions.

LINE_GRID, a Python library which computes a grid of points over the interior of a line segment in 1D.

POLYGON_GRID, a Python library which generates a grid of points over the interior of a polygon in 2D.

PYRAMID_GRID, a Python library which computes a grid of points over the interior of the unit pyramid in 3D;

SIMPLEX_GRID, a Python library which generates a grid of points over the interior of a simplex in M dimensions.

SPHERE_FIBONACCI_GRID, a Python library which computes a grid of points using the Fibonacci spiral over the surface of a sphere in 3D.

SPHERE_INTEGRALS, a Python library which returns the exact value of the integral of any monomial over the surface of the unit sphere in 3D.

SPHERE_LLQ_GRID, a Python library which computes a grid of quadrilaterals bounded by latitude and longitude lines over the surface of a sphere in 3D.

SPHERE_MONTE_CARLO, a Python library which applies a Monte Carlo method to estimate the integral of a function on the surface of the unit sphere in 3D;

SQUARE_GRID, a Python library which computes a grid of points over the interior of a square in 2D.

TETRAHEDRON_GRID, a Python library which computes a grid of points over the interior of a tetrahedron in 3D.

TRIANGLE_GRID, a Python library which computes a grid of points over the interior of a triangle in 2D.

WEDGE_GRID, a Python library which computes a grid of points over the interior of the unit wedge in 3D.

- i4mat_print.py, prints an I4MAT.
- i4mat_print_some.py, prints some of an I4MAT.
- r8vec_print.py, prints an R8VEC.
- sphere_llt_grid_display.py, displays an LLT grid on the surface of a sphere in 3D.
- sphere_llt_grid_line_count.py, counts lines on an LLT grid on the surface of a sphere in 3D.
- sphere_llt_grid_lines.py, produces lines on an LLT grid on the surface of a sphere in 3D.
- sphere_llt_grid_point_count.py, counts points on an LLT grid on the surface of a sphere in 3D.
- sphere_llt_grid_points.py, produces points on an LLT grid on the surface of a sphere in 3D.
- timestamp.py, prints the current YMDHMS date as a time stamp.

- sphere_llt_grid_test.py, calls all the tests;
- sphere_llt_grid_test.sh, runs all the tests;
- sphere_llt_grid_test_output.txt, the output file.
- sphere_llt_grid.png, an image of an LLQ grid on the surface of a sphere in 3D.

You can go up one level to the Python source codes.