gdal3.js/src/allJsFunctions/application/gdal_translate.spec.js

gdal3.js is a port of Gdal applications (**gdal_translate**, **ogr2ogr**, **gdal_rasterize**, **gdalwarp**, **gdaltransform**) to Webassembly. It allows you to convert raster and vector geospatial data to various formats and coordinate systems.

/* eslint-disable global-require */
/* eslint-disable func-names */
const isNode = Object.prototype.toString.call(typeof process !== 'undefined' ? process : 0) === '[object process]'; // https://github.com/iliakan/detect-node/blob/master/index.js

let Gdal;
let assert;

if (isNode) assert = require('chai').assert;
else assert = chai.assert;

describe('application / gdal_translate', function () {
    before(async function () {
        if (isNode) {
            this.timeout(15000);
            const dest = require('fs').mkdtempSync('/tmp/gdaljs');
            const initGdalJs = require('../../../build/package/gdal3.coverage');
            Gdal = await initGdalJs({ path: 'build/package', dest });
        } else {
            this.timeout(30000);
            Gdal = await initGdalJs({ path: '../package', useWorker: false });
        }
    });
    it('gdal_translate', async function () {
        let file = 'data/simple-polygon-line-point.tif';
        if (!isNode) {
            const fileData = await fetch(file);
            file = new File([await fileData.blob()], 'simple-polygon-line-point.tif');
        } else file = `test/${file}`;

        const result = await Gdal.open(file);
        const firstDataset = result.datasets[0];
        const info = await Gdal.getInfo(firstDataset);
        assert.strictEqual(firstDataset.pointer > 0, true, 'An error occurred while opening the tif file. (ptr == 0)');
        assert.strictEqual(info.bandCount === 4, true, `tif file does not have four layers. (bandCount == ${info.bandCount})`);
        const outputPath = await Gdal.gdal_translate(firstDataset, ['-of', 'PNG']);
        assert.strictEqual(outputPath.local, '/output/simple-polygon-line-point.png', 'An error occurred while converting the file.');

        const result2 = await Gdal.open(outputPath.real);
        const firstDataset2 = result2.datasets[0];
        const info2 = await Gdal.getInfo(firstDataset2);
        assert.strictEqual(firstDataset2.pointer > 0, true, 'An error occurred while converting the file. (ptr == 0)');
        assert.strictEqual(info2.bandCount === 4, true, `png file does not have four layers. (bandCount == ${info2.bandCount})`);
    });
    it('gdal_translate fail', async function () {
        let file = 'data/simple-polygon-line-point.tif';
        if (!isNode) {
            const fileData = await fetch(file);
            file = new File([await fileData.blob()], 'simple-polygon-line-point.tif');
        } else file = `test/${file}`;

        const result = await Gdal.open(file);
        const firstDataset = result.datasets[0];
        const info = await Gdal.getInfo(firstDataset);
        assert.strictEqual(firstDataset.pointer > 0, true, 'An error occurred while opening the tif file. (ptr == 0)');
        assert.strictEqual(info.bandCount === 4, true, `tif file does not have four layers. (bandCount == ${info.bandCount})`);

        let failed = false;
        return Gdal.gdal_translate(firstDataset, ['-f', 'PNG2']).then(() => { failed = false; }).catch(() => { failed = true; })
            .finally(() => { assert.strictEqual(failed, true, 'An error occurred'); });
    });
    it('gdal_translate with config', async function () {
        let file = 'data/spaf27_epsg.tif';
        if (!isNode) {
            const fileData = await fetch(file);
            file = new File([await fileData.blob()], 'spaf27_epsg.tif');
        } else file = `test/${file}`;

        const result = await Gdal.open(file);
        const firstDataset = result.datasets[0];
        assert.strictEqual(firstDataset.pointer > 0, true, 'An error occurred while opening the tif file. (ptr == 0)');
        const outputPath = await Gdal.gdal_translate(firstDataset, ['-of', 'JPEG', '--config', 'GDAL_JPEG_TO_RGB', 'NO']);
        assert.strictEqual(outputPath.local, '/output/spaf27_epsg.jpg', 'An error occurred while converting the file.');

        const result2 = await Gdal.open(outputPath.real);
        const firstDataset2 = result2.datasets[0];
        assert.strictEqual(firstDataset2.pointer > 0, true, 'An error occurred while converting the file. (ptr == 0)');
    });
});