Grid¶

Attributes¶

• NumCells

  Number of cells in the grid.

• SURF_TYPE

  Surface type.

Depending on the surface type there are different additional attributes.

For surface type “IEQ” (icosahedral grid):

• SUBDIV

  Number of subdivisions for icosahedral grids, 0 otherwise.

For surface type “LTC” (lattice grid):

• LINKS

  Number of neighbors for each node.

• SURF_TYPE

  Surface type.

• PROJG

  Projection grid (optional).

• PROJT

  Projection type (optional).

• W

  Width of grid.

• H

  Height of grid.

• PERIODIC

  Periodicity on/of.

DataSets¶

The grid groups contains only one dataset.

CellDataSet

An array of arrays, where the i-th entry is the array of neighbor node ids for node i.

Each of the neighbor node arrays has a size equal to the maximum number of neighbors in the grid.

If a node has less than this number of neighbors, the array is padded with the fake id -1.

Example¶

For the following 4x3 grid with a 6-neighborhood

the CellDataSet would be

[[1,  4, -1, -1, -1, -1], [0,  2,  4,  5, -1, -1], [1,  3,  5,  6, -1, -1], [2,  6,  7, -1, -1, -1],
 [0,  1,  5,  8, -1, -1], [1,  2,  4,  6,  8,  9], [2,  3,  5,  7,  9, 10], [3,  6, 10, 11, -1, -1],
 [4,  5,  9, -1, -1, -1], [5,  6,  8, 10, -1, -1], [6,  7,  9, 11, -1, -1], [7, 10, -1, -1, -1, -1]]