georaster

georaster

Wrapper around Georeferenced Rasters like GeoTIFF, NetCDF, JPG, and PNG that provides a standard interface. You can also create your own georaster from simple JavaScript objects.

load from url on front-end

const parse_georaster = require("georaster");
fetch(url)
  .then(response => response.arrayBuffer() )
  .then(parse_georaster)
  .then(georaster => {
      console.log("georaster:", georaster);
  });

load from file on back-end

const parse_georaster = require("georaster");
fs.readFile("data/GeogToWGS84GeoKey5.tif", (error, data) => {
    parse_georaster(data).then(georaster => {
      console.log("georaster:", georaster);
    })
});

load from simple object on front-end

const parse_georaster = require("georaster");
const values = [ [ [0, 1, 2], [0, 0, 0], [2, 1, 1] ] ];
const no_data_value = 3;
const projection = 4326;
const xmin = -40;
const ymax = 14;
const pixelWidth = 0.00001;
const pixelHeight = 0.00001;
const metadata = { no_data_value, projection, xmin, ymax, pixelWidth, pixelHeight };
const georaster = parse_georaster(values, metadata);

properties

name	description
maxs	array with max value for each band
mins	array with min value for each band
ranges	array with difference between max and min value for each band
no_data_value	no data value
pixelWidth	width of pixel in dimension of coordinate reference system
pixelHeight	height of pixel in dimension of coordinate reference system
projection	equal to EPSG code, like 4326
values	two dimensional array of pixel values
width	number of pixels wide raster is
xmax	xmax in crs, which is often in longitude
xmin	xmin in crs, which is often in longitude
ymin	ymin in crs, which is often in latitude
ymax	ymax in crs, which is often in latitude