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Spatial Make Grid

Description

Section titled “Description”

The Spatial Make Grid step tiles a rectangular extent into square cells of a fixed ground size and writes one row per cell. It is the equivalent of the Alteryx Make Grid tool and runs in the workflow engine.

The cell count is arithmetic once the extent is read off the data — ceil(extent ÷ cell size) each way — so the fan-out is bounded and predictable.

Source & Options

Section titled “Source & Options”
  • Source Table / Output Table — the input geometries and where the cells are written.
  • Geometry column — the WKT geometry column whose extent is tiled.
  • Grid size and Units — the ground size of one square cell, in miles, kilometers, meters, or feet.
  • Grid per object — when set, a separate grid is drawn over each input geometry; otherwise one grid covers the extent of the whole layer.
  • Clip to polygon — in per-object mode, trims each cell to the polygon it belongs to. On by default.
  • Grid name column — the name of the output cell-label column (GridName by default).
  • Output column — the name of the output geometry column (SpatialObj by default).

Output Columns

Section titled “Output Columns”

Every row carries the cell label and the cell geometry. In per-object mode the source columns pass through alongside them; in whole-layer mode the output is just the two grid columns, since a cell belongs to no single input row.

Notes

Section titled “Notes”

A grid size that is zero or negative fails the step rather than producing an empty grid.

Cell size is converted from the chosen ground unit to an approximate degree size, so cells read as slightly rectangular far from the equator — the same planar approximation the other real-world-unit spatial steps make.

Section titled “Related”