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api_algorithms.test.ts
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api_algorithms.test.ts
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import * as gdal from 'gdal-async'
import * as chai from 'chai'
import * as path from 'path'
import * as semver from 'semver'
const assert: Chai.Assert = chai.assert
import * as chaiAsPromised from 'chai-as-promised'
chai.use(chaiAsPromised)
describe('gdal', () => {
afterEach(() => void global.gc!())
describe('contourGenerate()', () => {
let src: gdal.Dataset, srcband: gdal.RasterBand, dst: gdal.Dataset, lyr: gdal.Layer
before(() => {
// create a simple ramp in memory
const w = 64
const h = 64
src = gdal.open('temp', 'w', 'MEM', w, h, 1)
srcband = src.bands.get(1)
for (let y = 0; y < h; y++) {
const buf = Buffer.alloc(w)
buf.fill(y * 4)
srcband.pixels.write(0, y, w, 1, new Uint8Array(buf))
}
})
after(() => {
src.close()
})
beforeEach(() => {
dst = gdal.open('temp', 'w', 'Memory')
lyr = dst.layers.create('temp', null, gdal.LineString)
lyr.fields.add(new gdal.FieldDefn('id', gdal.OFTInteger))
lyr.fields.add(new gdal.FieldDefn('elev', gdal.OFTReal))
})
afterEach(() => {
try {
dst.close()
} catch (_err) {
/* ignore */
}
})
it('should generate contours when passed an interval / base', () => {
const offset = 7
const interval = 32
gdal.contourGenerate({
src: srcband,
dst: lyr,
offset: offset,
interval: interval,
idField: 0,
elevField: 1
})
assert.isTrue(lyr.features.count() > 0, 'features were created')
lyr.features.forEach((feature) => {
assert.isTrue(
(feature.fields.get('elev') - offset) % interval === 0,
'contour used correct interval / base'
)
assert.isFalse(feature.getGeometry().isEmpty())
})
})
it('should accept an array of fixed levels', () => {
const order = (a: number, b: number) => a - b
const levels = [ 53, 43, 193 ].sort(order)
gdal.contourGenerate({
src: srcband,
dst: lyr,
fixedLevels: levels,
idField: 0,
elevField: 1
})
assert.isTrue(lyr.features.count() > 0, 'features were created')
const actual_levels = [] as number[]
lyr.features.forEach((feature) => {
const elev = feature.fields.get('elev')
assert.include(
levels,
elev,
'contour elevation in array of fixed levels'
)
assert.isFalse(feature.getGeometry().isEmpty())
if (actual_levels.indexOf(elev) === -1) actual_levels.push(elev)
})
assert.deepEqual(levels, actual_levels.sort(order), 'all fixed levels used')
})
it('should accept a "progress_cb"', () => {
const offset = 7
const interval = 32
let calls = 0
gdal.contourGenerate({
src: srcband,
dst: lyr,
offset: offset,
interval: interval,
idField: 0,
elevField: 1,
progress_cb: () => {
calls++
}
})
assert.isAbove(calls, 0)
})
})
describe('contourGenerateAsync()', () => {
let src: gdal.Dataset, srcband: gdal.RasterBand, dst: gdal.Dataset, lyr: gdal.Layer
before(() => {
// create a simple ramp in memory
const w = 64
const h = 64
src = gdal.open('temp', 'w', 'MEM', w, h, 1)
srcband = src.bands.get(1)
for (let y = 0; y < h; y++) {
const buf = Buffer.alloc(w)
buf.fill(y * 4)
srcband.pixels.write(0, y, w, 1, new Uint8Array(buf))
}
})
beforeEach(() => {
dst = gdal.open('temp', 'w', 'Memory')
lyr = dst.layers.create('temp', null, gdal.LineString)
lyr.fields.add(new gdal.FieldDefn('id', gdal.OFTInteger))
lyr.fields.add(new gdal.FieldDefn('elev', gdal.OFTReal))
})
it('should generate contours when passed an interval / base', () => {
const offset = 7
const interval = 32
const p = gdal.contourGenerateAsync({
src: srcband,
dst: lyr,
offset: offset,
interval: interval,
idField: 0,
elevField: 1
})
return assert.eventually.isTrue(p.then(() => lyr.features.count() > 0), 'features were created')
})
})
describe('fillNodata()', () => {
let src: gdal.Dataset, srcband: gdal.RasterBand
const holes_x = [ 53, 61, 61, 1, 43, 44, 5 ]
const holes_y = [ 11, 5, 6, 33, 22, 11, 0 ]
const nodata = 33
beforeEach(() => {
const w = 64
const h = 64
src = gdal.open('temp', 'w', 'MEM', w, h, 1)
srcband = src.bands.get(1)
srcband.noDataValue = nodata
// sprinkle a solid fill with nodata
const buf = Buffer.alloc(w * h)
buf.fill(128)
srcband.pixels.write(0, 0, w, h, new Uint8Array(buf))
for (let i = 0; i < holes_x.length; i++) {
srcband.pixels.set(holes_x[i], holes_y[i], nodata)
assert.equal(srcband.pixels.get(holes_x[i], holes_y[i]), nodata)
}
})
afterEach(() => {
try {
src.close()
} catch (_err) {
/* ignore */
}
})
it('should fill nodata values', () => {
gdal.fillNodata({
src: srcband,
searchDist: 3,
smoothingIterations: 2
})
for (let i = 0; i < holes_x.length; i++) {
assert.notEqual(srcband.pixels.get(holes_x[i], holes_y[i]), nodata)
}
})
})
describe('fillNodataAsync()', () => {
let src: gdal.Dataset, srcband: gdal.RasterBand
const holes_x = [ 53, 61, 61, 1, 43, 44, 5 ]
const holes_y = [ 11, 5, 6, 33, 22, 11, 0 ]
const nodata = 33
beforeEach(() => {
const w = 64
const h = 64
src = gdal.open('temp', 'w', 'MEM', w, h, 1)
srcband = src.bands.get(1)
srcband.noDataValue = nodata
// sprinkle a solid fill with nodata
const buf = Buffer.alloc(w * h)
buf.fill(128)
srcband.pixels.write(0, 0, w, h, new Uint8Array(buf))
for (let i = 0; i < holes_x.length; i++) {
srcband.pixels.set(holes_x[i], holes_y[i], nodata)
assert.equal(srcband.pixels.get(holes_x[i], holes_y[i]), nodata)
}
})
it('should fill nodata values', () => {
const p = gdal.fillNodataAsync({
src: srcband,
searchDist: 3,
smoothingIterations: 2
})
const r = []
for (let i = 0; i < holes_x.length; i++) {
r.push(assert.eventually.notEqual(p.then(() => srcband.pixels.get(holes_x[i], holes_y[i])), nodata))
}
return assert.isFulfilled(Promise.all(r))
})
})
describe('checksumImage()', () => {
let src: gdal.Dataset, band: gdal.RasterBand
const w = 16
const h = 16
beforeEach(() => {
src = gdal.open('temp', 'w', 'MEM', w, h, 1)
band = src.bands.get(1)
})
afterEach(() => {
try {
src.close()
} catch (_err) {
/* ignore */
}
})
it('should generate unique checksum for the given region', () => {
for (let x = 0; x < w; x++) {
for (let y = 0; y < h; y++) {
band.pixels.set(x, y, (x * h + y) % 255)
}
}
band.pixels.set(4, 4, 25)
const a = gdal.checksumImage(band)
band.pixels.set(4, 4, 93)
const b = gdal.checksumImage(band)
const c = gdal.checksumImage(band, 8, 0, w / 2, h)
assert.notEqual(a, b)
assert.notEqual(b, c)
})
})
describe('checksumImageAsync()', () => {
let src: gdal.Dataset, band: gdal.RasterBand
const w = 16
const h = 16
beforeEach(() => {
src = gdal.open('temp', 'w', 'MEM', w, h, 1)
band = src.bands.get(1)
})
it('should generate unique checksum for the given region', () => {
for (let x = 0; x < w; x++) {
for (let y = 0; y < h; y++) {
band.pixels.set(x, y, (x * h + y) % 255)
}
}
band.pixels.set(4, 4, 25)
const a = gdal.checksumImageAsync(band)
band.pixels.set(4, 4, 93)
const b = gdal.checksumImageAsync(band)
const c = gdal.checksumImageAsync(band, 8, 0, w / 2, h)
return assert.isFulfilled(Promise.all([ assert.eventually.notEqual(a, b), assert.eventually.notEqual(b, c) ]))
})
})
describe('sieveFilter()', () => {
let src: gdal.Dataset, band: gdal.RasterBand
const w = 64
const h = 64
beforeEach(() => {
src = gdal.open('temp', 'w', 'MEM', w, h, 1)
band = src.bands.get(1)
// create two rectangles next to eachother of differing sizes
const small_buffer = Buffer.alloc(4 * 4)
small_buffer.fill(10)
const big_buffer = Buffer.alloc(32 * 32)
big_buffer.fill(20)
band.pixels.write(5, 5, 32, 32, new Uint8Array(big_buffer))
band.pixels.write(7, 7, 4, 4, new Uint8Array(small_buffer))
})
afterEach(() => {
try {
src.close()
} catch (_err) {
/* ignore */
}
})
it('should fill smaller polygons with value from neighboring bigger polygon', () => {
assert.equal(band.pixels.get(8, 8), 10)
gdal.sieveFilter({
src: band,
dst: band, // in place
threshold: 4 * 4 + 1,
connectedness: 8
})
assert.equal(band.pixels.get(8, 8), 20)
})
it('accept "progress_cb"', () => {
assert.equal(band.pixels.get(8, 8), 10)
let calls = 0
gdal.sieveFilter({
src: band,
dst: band, // in place
threshold: 4 * 4 + 1,
connectedness: 8,
progress_cb: () => {
calls++
}
})
assert.isAbove(calls, 0)
assert.equal(band.pixels.get(8, 8), 20)
})
})
describe('sieveFilterAsync()', () => {
let src: gdal.Dataset, band: gdal.RasterBand
const w = 64
const h = 64
beforeEach(() => {
src = gdal.open('temp', 'w', 'MEM', w, h, 1)
band = src.bands.get(1)
// create two rectangles next to eachother of differing sizes
const small_buffer = Buffer.alloc(4 * 4)
small_buffer.fill(10)
const big_buffer = Buffer.alloc(32 * 32)
big_buffer.fill(20)
band.pixels.write(5, 5, 32, 32, new Uint8Array(big_buffer))
band.pixels.write(7, 7, 4, 4, new Uint8Array(small_buffer))
})
it('should fill smaller polygons with value from neighboring bigger polygon', () => {
assert.equal(band.pixels.get(8, 8), 10)
const p = gdal.sieveFilterAsync({
src: band,
dst: band, // in place
threshold: 4 * 4 + 1,
connectedness: 8
})
return assert.eventually.equal(p.then(() => band.pixels.get(8, 8)), 20)
})
})
describe('polygonize()', () => {
let src: gdal.Dataset, srcband: gdal.RasterBand, dst: gdal.Dataset, lyr: gdal.Layer
before(() => {
// create two identical rectangles
const w = 64
const h = 64
src = gdal.open('temp', 'w', 'MEM', w, h, 1)
srcband = src.bands.get(1)
for (let y = 0; y < h; y++) {
const buf = Buffer.alloc(w)
buf.fill(y & 32)
srcband.pixels.write(0, y, w, 1, new Uint8Array(buf))
}
})
after(() => {
try {
src.close()
} catch (_err) {
/* ignore */
}
})
beforeEach(() => {
dst = gdal.open('temp', 'w', 'Memory')
lyr = dst.layers.create('temp', null, gdal.Polygon)
lyr.fields.add(new gdal.FieldDefn('val', gdal.OFTInteger))
})
afterEach(() => {
try {
dst.close()
} catch (_err) {
/* ignore */
}
})
it('should generate polygons from a RasterBand', () => {
gdal.polygonize({
src: srcband,
dst: lyr,
pixValField: 0,
connectedness: 8
})
assert.equal(lyr.features.count(), 2)
lyr.features.forEach((f) => {
const geom = f.getGeometry()
assert.isFalse(geom.isEmpty())
assert.instanceOf(geom, gdal.Polygon)
})
})
it('should accept a "progress_cb"', () => {
let calls = 0
gdal.polygonize({
src: srcband,
dst: lyr,
pixValField: 0,
connectedness: 8,
progress_cb: () => {
calls++
}
})
assert.isAbove(calls, 0)
})
})
describe('addPixelFunc()', () => {
it('should throw with invalid arguments', () => {
assert.throws(() => {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
(gdal.addPixelFunc as any)(1, 2)
}, /name must be a string/)
assert.throws(() => {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
(gdal.addPixelFunc as any)('func', 2)
}, /pixelFn must be an object/)
assert.throws(() => {
gdal.addPixelFunc('func', new Uint8Array(48))
}, /pixelFn must be a native code pixel function/)
})
})
describe('toPixelFunc()', () => {
let band1: gdal.RasterBand, band2: gdal.RasterBand
before(() => {
band1 = gdal.open(path.resolve(__dirname, 'data', 'AROME_T2m_10.tiff')).bands.get(1)
band2 = gdal.open(path.resolve(__dirname, 'data', 'AROME_D2m_10.tiff')).bands.get(1)
})
it('should produce a binary pixel function from a JS function', function () {
if (!semver.gte(gdal.version, '3.5.0-git')) this.skip()
const sum2 = (sources: gdal.TypedArray[], buffer: gdal.TypedArray, args: Record<string, string|number>) => {
assert.equal(sources.length, 2)
assert.instanceOf(sources[0], Float64Array)
assert.instanceOf(sources[1], Float64Array)
assert.instanceOf(buffer, Float64Array)
assert.isEmpty(args)
for (let i = 0; i < buffer.length; i++) {
buffer[i] = sources[0][i] + sources[1][i] + 1
}
}
gdal.addPixelFunc('sum2', gdal.toPixelFunc(sum2))
const vrt = gdal.wrapVRT({
bands: [
{
sources: [ band1, band2 ],
pixelFunc: 'sum2'
}
]
})
const ds = gdal.open(vrt)
assert.equal(ds.bands.count(), 1)
const input1 = band1.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const input2 = band2.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const q = ds.bands.get(1).pixels.readAsync(0, 0, ds.rasterSize.x, ds.rasterSize.y).then((result) => {
for (let i = 0; i < ds.rasterSize.x * ds.rasterSize.y; i += 256) {
assert.closeTo(result[i], input1[i] + input2[i] + 1, 1e-6)
}
})
return assert.isFulfilled(q)
})
it('should propagate exceptions to the calling code', function () {
if (!semver.gte(gdal.version, '3.5.0-git')) this.skip()
const fail = () => {
throw new Error('pixel function failed')
}
gdal.addPixelFunc('fail', gdal.toPixelFunc(fail))
const vrt = gdal.wrapVRT({
bands: [
{
sources: [ band1, band2 ],
pixelFunc: 'fail'
}
]
})
const ds = gdal.open(vrt)
return assert.isRejected(ds.bands.get(1).pixels.readAsync(0, 0, ds.rasterSize.x, ds.rasterSize.y),
/pixel function failed/)
})
it('should support being called synchronously', function () {
if (!semver.gte(gdal.version, '3.5.0-git')) this.skip()
const sync = (sources: gdal.TypedArray[], buffer: gdal.TypedArray) => {
for (let i = 0; i < buffer.length; i++) {
buffer[i] = sources[0][i] + sources[1][i] + 2
}
}
gdal.addPixelFunc('sync', gdal.toPixelFunc(sync))
const vrt = gdal.wrapVRT({
bands: [
{
sources: [ band1, band2 ],
pixelFunc: 'sync'
}
]
})
const ds = gdal.open(vrt)
assert.equal(ds.bands.count(), 1)
const input1 = band1.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const input2 = band2.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const result = ds.bands.get(1).pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
for (let i = 0; i < ds.rasterSize.x * ds.rasterSize.y; i += 256) {
assert.closeTo(result[i], input1[i] + input2[i] + 2, 1e-6)
}
})
it('should support converting the data type', function () {
if (!semver.gte(gdal.version, '3.5.0-git')) this.skip()
const sum2 = (sources: gdal.TypedArray[], buffer: gdal.TypedArray) => {
assert.equal(sources.length, 2)
assert.instanceOf(sources[0], Float32Array)
assert.instanceOf(sources[1], Float32Array)
assert.instanceOf(buffer, Int32Array)
for (let i = 0; i < buffer.length; i++) {
buffer[i] = sources[0][i] + sources[1][i] + 3
}
}
gdal.addPixelFunc('sum2int', gdal.toPixelFunc(sum2))
const vrt = gdal.wrapVRT({
bands: [
{
sources: [ band1, band2 ],
pixelFunc: 'sum2int',
dataType: gdal.GDT_Int32,
sourceTransferType: gdal.GDT_Float32
}
]
})
const ds = gdal.open(vrt)
assert.equal(ds.bands.count(), 1)
assert.equal(ds.bands.get(1).dataType, gdal.GDT_Int32)
const input1 = band1.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const input2 = band2.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const q = ds.bands.get(1).pixels.readAsync(0, 0, ds.rasterSize.x, ds.rasterSize.y).then((result) => {
assert.instanceOf(result, Int32Array)
for (let i = 0; i < ds.rasterSize.x * ds.rasterSize.y; i += 256) {
assert.closeTo(result[i], input1[i] + input2[i] + 3, 1)
}
})
return assert.isFulfilled(q)
})
it('should pass any additional arguments', function () {
if (!semver.gte(gdal.version, '3.5.0-git')) this.skip()
const withArgs = (sources: gdal.TypedArray[], buffer: gdal.TypedArray, args: Record<string, string|number>) => {
assert.deepEqual(args, { s: 'stringArg', k: 20, t: 15, pi: 3.14 })
assert.isString(args.s)
assert.isNumber(args.k)
assert.isNumber(args.t)
assert.isNumber(args.pi)
for (let i = 0; i < buffer.length; i++) {
buffer[i] = +args.k + sources[0][i] + sources[1][i]
}
}
gdal.addPixelFunc('withArgs', gdal.toPixelFunc(withArgs))
const vrt = gdal.wrapVRT({
bands: [
{
sources: [ band1, band2 ],
pixelFunc: 'withArgs',
pixelFuncArgs: { s: 'stringArg', k: 20, t: '15', pi: '3.14' }
}
]
})
const ds = gdal.open(vrt)
assert.equal(ds.bands.count(), 1)
const input1 = band1.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const input2 = band2.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const result = ds.bands.get(1).pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
for (let i = 0; i < ds.rasterSize.x * ds.rasterSize.y; i += 256) {
assert.closeTo(result[i], input1[i] + input2[i] + 20, 1e-6)
}
})
})
describe('createPixelFunc()', () => {
let band1: gdal.RasterBand, band2: gdal.RasterBand
before(() => {
band1 = gdal.open(path.resolve(__dirname, 'data', 'AROME_T2m_10.tiff')).bands.get(1)
band2 = gdal.open(path.resolve(__dirname, 'data', 'AROME_D2m_10.tiff')).bands.get(1)
})
it('should create a pixel function from a JS function for a single pixel', function () {
if (!semver.gte(gdal.version, '3.5.0-git')) this.skip()
gdal.addPixelFunc('createPxFn', gdal.createPixelFunc((a, b) => a + b + 4))
const vrt = gdal.wrapVRT({
bands: [
{
sources: [ band1, band2 ],
pixelFunc: 'createPxFn'
}
]
})
const ds = gdal.open(vrt)
assert.equal(ds.bands.count(), 1)
const input1 = band1.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const input2 = band2.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const result = ds.bands.get(1).pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
for (let i = 0; i < ds.rasterSize.x * ds.rasterSize.y; i += 256) {
assert.closeTo(result[i], input1[i] + input2[i] + 4, 1e-6)
}
})
it('should support converting the data type', function () {
if (!semver.gte(gdal.version, '3.5.0-git')) this.skip()
gdal.addPixelFunc('createPxFnInt', gdal.createPixelFunc((a, b) => Math.round(a + b + 5)))
const vrt = gdal.wrapVRT({
bands: [
{
sources: [ band1, band2 ],
pixelFunc: 'createPxFnInt',
dataType: gdal.GDT_Int32,
sourceTransferType: gdal.GDT_Float32
}
]
})
const ds = gdal.open(vrt)
assert.equal(ds.bands.count(), 1)
assert.equal(ds.bands.get(1).dataType, gdal.GDT_Int32)
const input1 = band1.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const input2 = band2.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const result = ds.bands.get(1).pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
for (let i = 0; i < ds.rasterSize.x * ds.rasterSize.y; i += 256) {
assert.instanceOf(result, Int32Array)
assert.closeTo(result[i], input1[i] + input2[i] + 5, 0.5, `${input1[i]} + ${input2[i]}`)
}
})
})
describe('createPixelFuncWithArgs()', () => {
let band1: gdal.RasterBand, band2: gdal.RasterBand
before(() => {
band1 = gdal.open(path.resolve(__dirname, 'data', 'AROME_T2m_10.tiff')).bands.get(1)
band2 = gdal.open(path.resolve(__dirname, 'data', 'AROME_D2m_10.tiff')).bands.get(1)
})
it('should create a pixel function with arguments from a JS function for a single pixel', function () {
if (!semver.gte(gdal.version, '3.5.0-git')) this.skip()
const k = 42
gdal.addPixelFunc('createPxFn', gdal.createPixelFuncWithArgs((args, a, b) => a + b + +args.k))
const vrt = gdal.wrapVRT({
bands: [
{
sources: [ band1, band2 ],
pixelFunc: 'createPxFn',
pixelFuncArgs: { k }
}
]
})
const ds = gdal.open(vrt)
assert.equal(ds.bands.count(), 1)
const input1 = band1.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const input2 = band2.pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
const result = ds.bands.get(1).pixels.read(0, 0, ds.rasterSize.x, ds.rasterSize.y)
for (let i = 0; i < ds.rasterSize.x * ds.rasterSize.y; i += 256) {
assert.closeTo(result[i], input1[i] + input2[i] + k, 1e-6)
}
})
})
})