ascii-grid

ascii-grid: beta

Identify and Read an ARC/INFO ASCII Grid

usage

identify ascii grid files

isAsciiGrid identifies ASCII GRID files in the following formats: ArrayBuffer, Buffer, DataView, Promise, String, and Uint8Array

const isAsciiGrid = require("ascii-grid/is-ascii-grid");

const buffer = readFileSync('./test_data/michigan_lld/michigan_lld.asc');
isAsciiGrid(buffer, { debug: false });
// true

parse ascii grid metadata

const parseAsciiGridMeta = require("ascii-grid/parse-ascii-grid-meta");

const buffer = readFileSync('./test_data/michigan_lld/michigan_lld.asc');
const metadata = parseAsciiGridMeta(buffer, { debug: false });
/*
{
  ncols: 4201,
  nrows: 5365,
  xllcenter: -88,
  yllcenter: 41.62,
  cellsize: 0.0008333333333,
  nodata_value: -9999,
  last_metadata_line: 5,
  last_metadata_byte: 95
}
*/

Reading Pixel Values

const parseAsciiGridData = require("ascii-grid/parse-ascii-grid-data");

const result = await parseAsciiGridData({ data: buffer, debug: true });
// result is a two-dimensional array of rows with pixel values