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gdal_processing.js
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gdal_processing.js
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const fs = require('fs');
const debug = require('debug')('gdal');
const gdal = require('gdal-async');
const path = require('path');
const uuid = require('uuid');
const defaultImage = {};
/**
*
* @param {string} url - url de l'image
* @param {int} x - numéro de tuile en colonne dans l'image
* @param {int} y - numéro de tuile en ligne dans l'image
* @param {int} z - niveau de zoom dans l'image (0 : pleine resolution)
* @param {string} formatGDAL - ex: PNG ou JPEG
* @param {*} blocSize - taille des tuiles
* @param {*} bands - tableau des bandes à utiliser ([0, 1, 2] par défaut)
* @returns
*/
async function getTileEncoded(url, x, y, z, formatGDAL, blocSize, bands) {
const b = bands || [0, 1, 2];
debug('~~~getTileEncoded : ', url, x, y, z, blocSize, b);
const name = `/vsimem/${uuid.v4()}`;
// url correspond au chemin de l'image RGB sauf
// dans le cas des OPI avec un cache purement IR (présence de _ix)
// en cas de besoin (bands contient 3), il faut construire le chemin vers l'image IR
// pour les OPIs (YB_OPI_20FD6925x00001_00588.tif -> YB_OPI_20FD6925ix00001_00588.tif)
// pour les Ortho (UP.tif -> UPi.tif)
let urlIr = url;
const dname = path.dirname(urlIr);
let fname = path.basename(urlIr);
if (fname.includes('_ix') === false) {
fname = fname.includes('x') ? fname.replace('x', '_ix') : fname.replace('.', 'i.');
urlIr = path.join(dname, fname);
}
debug(url, urlIr);
if (b.includes(3)) {
try {
await fs.promises.access(urlIr, fs.constants.R_OK);
} catch (_) {
debug('default');
if (!(blocSize in defaultImage)) {
const outDS = await gdal.openAsync('default', 'w', 'MEM', blocSize, blocSize, 3);
await gdal.drivers.get(formatGDAL).createCopyAsync(name, outDS);
defaultImage[blocSize] = gdal.vsimem.release(name);
}
return defaultImage[blocSize];
}
} else {
try {
await fs.promises.access(url, fs.constants.R_OK);
} catch (_) {
debug('default');
if (!(blocSize in defaultImage)) {
const outDS = await gdal.openAsync('default', 'w', 'MEM', blocSize, blocSize, 3);
await gdal.drivers.get(formatGDAL).createCopyAsync(name, outDS);
defaultImage[blocSize] = gdal.vsimem.release(name);
}
return defaultImage[blocSize];
}
}
// On ouvre les images si nécessaire
debug('On ouvre les images si nécessaire');
const withRgb = b.includes(0) || b.includes(1) || b.includes(2);
const withIr = b.includes(3);
const blocks = [];
if (withRgb) {
const dsRgb = await gdal.openAsync(url);
const blocksRgb = await Promise.all([
dsRgb.bands.getAsync(1)
.then((band) => (z === 0 ? band : band.overviews.getAsync(z - 1)))
.then((selectedLevel) => selectedLevel.pixels.readBlockAsync(x, y)),
dsRgb.bands.getAsync(2)
.then((band) => (z === 0 ? band : band.overviews.getAsync(z - 1)))
.then((selectedLevel) => selectedLevel.pixels.readBlockAsync(x, y)),
dsRgb.bands.getAsync(3)
.then((band) => (z === 0 ? band : band.overviews.getAsync(z - 1)))
.then((selectedLevel) => selectedLevel.pixels.readBlockAsync(x, y)),
]);
// Attention a toujours fermer les images ouvertes avec openAsync
// afin de ne pas bloquer le fichier
dsRgb.close();
blocks.push(blocksRgb[0], blocksRgb[1], blocksRgb[2]);
} else {
blocks.push(null, null, null);
}
if (withIr) {
const dsIr = await gdal.openAsync(urlIr);
const blockIr = await dsIr.bands.getAsync(1)
.then((band) => (z === 0 ? band : band.overviews.getAsync(z - 1)))
.then((selectedLevel) => selectedLevel.pixels.readBlockAsync(x, y));
// Attention a toujours fermer les images ouvertes avec openAsync
// afin de ne pas bloquer le fichier
dsIr.close();
blocks.push(blockIr);
} else {
blocks.push(null);
}
const outDS = await gdal.openAsync('default', 'w', 'MEM', blocSize, blocSize, 3);
await Promise.all([
outDS.bands.getAsync(1).then((band) => band.pixels.writeAsync(0, 0,
blocSize, blocSize, blocks[b[0]])),
outDS.bands.getAsync(2).then((band) => band.pixels.writeAsync(0, 0,
blocSize, blocSize, blocks[b[1]])),
outDS.bands.getAsync(3).then((band) => band.pixels.writeAsync(0, 0,
blocSize, blocSize, blocks[b[2]]))])
.then(() => gdal.drivers.get(formatGDAL).createCopyAsync(name, outDS));
return gdal.vsimem.release(name);
}
async function getColor(url, x, y, z, col, lig, blocSize) {
debug('getColor', url, x, y, z, col, lig, blocSize);
try {
await fs.promises.access(url, fs.constants.R_OK);
const ds = await gdal.openAsync(url);
const result = (z === 0)
? [
await (await ds.bands.getAsync(1)).pixels.getAsync(col + x * blocSize,
lig + y * blocSize),
await (await ds.bands.getAsync(2)).pixels.getAsync(col + x * blocSize,
lig + y * blocSize),
await (await ds.bands.getAsync(3)).pixels.getAsync(col + x * blocSize,
lig + y * blocSize),
] : [
await (await (await ds.bands.getAsync(1)).overviews.getAsync(z))
.pixels.getAsync(col, lig),
await (await (await ds.bands.getAsync(2)).overviews.getAsync(z - 1))
.pixels.getAsync(col, lig),
await (await (await ds.bands.getAsync(3)).overviews.getAsync(z - 1))
.pixels.getAsync(col, lig),
];
// Attention a toujours fermer les images ouvertes avec openAsync
// afin de ne pas bloquer le fichier
ds.close();
return result;
} catch (_) {
return [0, 0, 0];
}
}
async function getDefaultEncoded(formatGDAL, blocSize) {
const name = `/vsimem/${uuid.v4()}`;
await gdal.openAsync(name, 'w', formatGDAL, blocSize, blocSize, 3);
return gdal.vsimem.release(name);
}
function processPatchAsync(patch, blocSize) {
return new Promise((res, reject) => {
// On patch le graph
const { mask } = patch;
// Modification du graph
debug('ouverture de l image');
debug(patch);
const urlGraph = patch.withOrig ? patch.urlGraphOrig : patch.urlGraph;
const urlOrthoRgb = patch.withOrig ? patch.urlOrthoRgbOrig : patch.urlOrthoRgb;
const urlOrthoIr = urlOrthoRgb.replace('.', 'i.');
const { urlOpiRgb } = patch;
let urlOpiIr = urlOpiRgb;
const dname = path.dirname(urlOpiIr);
let fname = path.basename(urlOpiIr);
if (fname.includes('_ix') === false) {
fname = fname.includes('x') ? fname.replace('x', '_ix') : fname.replace('.', 'i.');
urlOpiIr = path.join(dname, fname);
}
async function getBands(ds) {
const size = await ds.rasterSizeAsync;
return Promise.all([
ds.bands.getAsync(1).then(
(band) => band.pixels.readAsync(0, 0, size.x, size.y),
),
ds.bands.getAsync(2).then(
(band) => band.pixels.readAsync(0, 0, size.x, size.y),
),
ds.bands.getAsync(3).then(
(band) => band.pixels.readAsync(0, 0, size.x, size.y),
),
ds.geoTransformAsync,
ds.srsAsync,
]).then((res2) => ({
bands: [res2[0], res2[1], res2[2]],
geoTransform: res2[3],
srs: res2[4],
size,
ds,
}));
}
async function getBand(ds) {
const size = await ds.rasterSizeAsync;
return Promise.all([
ds.bands.getAsync(1).then(
(band) => band.pixels.readAsync(0, 0, size.x, size.y),
),
ds.geoTransformAsync,
ds.srsAsync,
]).then((res2) => ({
bands: [res2[0]],
geoTransform: res2[1],
srs: res2[2],
size,
ds,
}));
}
debug('chargement...');
Promise.all([
gdal.openAsync(urlGraph).then((ds) => getBands(ds)),
patch.withRgb ? gdal.openAsync(urlOpiRgb).then((ds) => getBands(ds)) : null,
patch.withIr ? gdal.openAsync(urlOpiIr).then((ds) => getBand(ds)) : null,
patch.withRgb ? gdal.openAsync(urlOrthoRgb).then((ds) => getBands(ds)) : null,
patch.withIr ? gdal.openAsync(urlOrthoIr).then((ds) => getBand(ds)) : null,
]).then(async (images) => {
debug('... fin chargement');
debug('application du patch...');
const graph = images[0];
const opiRgb = images[1];
const opiIr = images[2];
const orthoRgb = images[3];
const orthoIr = images[4];
graph.bands[0].forEach((_element, index) => {
/* eslint-disable no-param-reassign */
if (mask.data[4 * index] > 0) {
[graph.bands[0][index],
graph.bands[1][index],
graph.bands[2][index]] = patch.color;
if (orthoRgb) {
[orthoRgb.bands[0][index],
orthoRgb.bands[1][index],
orthoRgb.bands[2][index]] = [
opiRgb.bands[0][index],
opiRgb.bands[1][index],
opiRgb.bands[2][index]];
}
if (orthoIr) {
orthoIr.bands[0][index] = opiIr.bands[0][index];
}
}
/* eslint-enable no-param-reassign */
});
debug('... fin application des patch');
debug('creation des images en memoire...');
// on verifie que l orientation est bien interprété
try {
graph.srs.autoIdentifyEPSG();
} catch (error) {
console.log('Erreur dans la gestion des SRS');
console.log('Il faut probablement supprimer la variable PROJ_LIB de votre environnement');
reject(new Error('PROJ_LIB Error'));
}
const graphMem = gdal.open('graph', 'w', 'MEM', graph.size.x, graph.size.y, 3);
graphMem.geoTransform = graph.geoTransform;
graphMem.srs = graph.srs;
graphMem.bands.get(1).pixels.write(0, 0,
graph.size.x, graph.size.y, graph.bands[0]);
graphMem.bands.get(2).pixels.write(0, 0,
graph.size.x, graph.size.y, graph.bands[1]);
graphMem.bands.get(3).pixels.write(0, 0,
graph.size.x, graph.size.y, graph.bands[2]);
const orthoRgbMem = orthoRgb ? gdal.open('orthoRgb', 'w', 'MEM',
orthoRgb.size.x, orthoRgb.size.y, 3) : null;
if (orthoRgbMem) {
orthoRgbMem.geoTransform = orthoRgb.geoTransform;
orthoRgbMem.srs = gdal.SpatialReference.fromWKT(orthoRgb.srs.toWKT());
orthoRgbMem.bands.get(1).pixels.write(0, 0,
orthoRgb.size.x, orthoRgb.size.y, orthoRgb.bands[0]);
orthoRgbMem.bands.get(2).pixels.write(0, 0,
orthoRgb.size.x, orthoRgb.size.y, orthoRgb.bands[1]);
orthoRgbMem.bands.get(3).pixels.write(0, 0,
orthoRgb.size.x, orthoRgb.size.y, orthoRgb.bands[2]);
}
const orthoIrMem = orthoIr ? gdal.open('orthoIr', 'w', 'MEM', orthoIr.size.x, orthoIr.size.y, 1) : null;
if (orthoIrMem) {
orthoIrMem.geoTransform = orthoIr.geoTransform;
orthoIrMem.srs = gdal.SpatialReference.fromWKT(orthoIr.srs.toWKT());
orthoIrMem.bands.get(1).pixels.write(0, 0,
orthoIr.size.x, orthoIr.size.y, orthoIr.bands[0]);
}
debug('... fin creation des images en memoire');
debug('creation des COGs ...');
// Attention a toujours fermer les images ouvertes avec openAsync
// afin de ne pas bloquer le fichier
graph.ds.close();
if (orthoRgb) {
orthoRgb.ds.close();
}
if (orthoIr) {
orthoIr.ds.close();
}
if (opiRgb) {
opiRgb.ds.close();
}
if (opiIr) {
opiIr.ds.close();
}
Promise.all([
gdal.drivers.get('COG').createCopyAsync(patch.urlGraphOutput, graphMem, {
BLOCKSIZE: blocSize,
COMPRESS: 'LZW',
RESAMPLING: 'NEAREST',
}),
orthoRgbMem ? gdal.drivers.get('COG').createCopyAsync(patch.urlOrthoRgbOutput, orthoRgbMem, {
BLOCKSIZE: blocSize,
COMPRESS: 'JPEG',
QUALITY: 90,
}) : null,
orthoIrMem ? gdal.drivers.get('COG').createCopyAsync(patch.urlOrthoIrOutput, orthoIrMem, {
BLOCKSIZE: blocSize,
COMPRESS: 'JPEG',
QUALITY: 90,
}) : null,
]).then((createdDs) => {
debug('...fin creation des COGs');
createdDs.forEach((ds) => {
if (ds) ds.close();
});
res('fin');
});
});
});
}
exports.getTileEncoded = getTileEncoded;
exports.getColor = getColor;
exports.getDefaultEncoded = getDefaultEncoded;
exports.processPatch = processPatchAsync;