Esri ASCII Grid Format

Stream Esri ASCII Grid rasters as cell or row records without loading the full grid first.

Overview

Property	Value
Format id	asc (aliases ascii-grid, asciigrid)
Class	ASCIIGridIterable
Extensions	.asc
Read	Yes
Write	Yes (cell mode)
Extra	none

Modes

• cell (default): one record per cell with row, col, x, y, value (nodata skipped).
• row: one record per grid row with row and values (includes nodata markers).

from iterable import open_iterable

with open_iterable("dem.asc") as source:
    for cell in source:
        print(cell["x"], cell["y"], cell["value"])

with open_iterable("dem.asc", iterableargs={"mode": "row"}) as source:
    for row in source:
        print(row["row"], len(row["values"]))

See also

• LAS — LiDAR points
• BAG — bathymetric grids
• Supported formats