terriajs-tiff-imagery-provider

v2.13.3-webpack5-3

Published

14 days ago

Load GeoTIFF/COG(Cloud optimized GeoTIFF) on Cesium

Downloads

1,706

0High
0Medium
0Low

na9da

stafivory

cesium geotiff cog webgl

TIFFImageryProvider

Load GeoTIFF/COG(Cloud optimized GeoTIFF) on Cesium

npm latest version license

中文readme

Features

Three band rendering.
Multi mode color rendering.
Support identify TIFF value with cartographic position.
WebGL accelerated rendering.
Band calculation.
Support nearest neighbor and bilinear interpolation resampling methods.
[experimental] Support any projected TIFF .

Install

#npm
npm install --save tiff-imagery-provider

#yarn
yarn add tiff-imagery-provider

#pnpm
pnpm add tiff-imagery-provider

Usage

Basic

import { Viewer } from "cesium";
import TIFFImageryProvider from 'tiff-imagery-provider';

const cesiumViewer = new Viewer("cesiumContainer");

const provider = await TIFFImageryProvider.fromUrl('https://oin-hotosm.s3.amazonaws.com/56f9b5a963ebf4bc00074e70/0/56f9c2d42b67227a79b4faec.tif');

cesiumViewer.imageryLayers.addImageryProvider(provider);

You can also use the New keyword to create a new TIFFimageryProvider, which was deprecated after [email protected]+

const provider = new TIFFImageryProvider({
  url: YOUR_TIFF_URL,
});
provider.readyPromise.then(() => {
  cesiumViewer.imageryLayers.addImageryProvider(provider);
})

Experimental If TIFF's projection is not EPSG:4326 or EPSG:3857, you can pass the projFunc to handle the projection

import proj4 from 'proj4';

TIFFImageryProvider.fromUrl(YOUR_TIFF_URL, {
  projFunc: (code) => {
    if (code === 32760) {
      proj4.defs("EPSG:32760", "+proj=utm +zone=60 +south +datum=WGS84 +units=m +no_defs +type=crs");
      return {
        project: proj4("EPSG:4326", "EPSG:32760").forward,
        unproject: proj4("EPSG:4326", "EPSG:32760").inverse
      }
    }
  }
});

Band calculation

// NDVI
TIFFImageryProvider.fromUrl(YOUR_TIFF_URL, {
  renderOptions: {
    single: {
      colorScale: 'rainbow',
      domain: [-1, 1],
      expression: '(b1 - b2) / (b1 + b2)'
    }
  }
});

Custom colors

TIFFImageryProvider.fromUrl(YOUR_TIFF_URL, {
  renderOptions: {
    single: {
      "colors": [
        [1, "rgb(154, 206, 127)"],
        [2, "rgb(163, 214, 245)"],
        [3, "rgb(255, 251, 177)"],
        [4, "rgb(193, 114, 97)"],
        [5, "rgb(220, 100, 120)"],
        [6, "rgb(49, 173, 105)"]
      ],
      type: "discrete",
      useRealValue: true // use real value in colors stops
    }
  }
});

API

class TIFFImageryProvider {
  ready: boolean;
  readyPromise: Promise<void>
  bands: Record<number, {
    min: number;
    max: number;
  }>;
  origin: number[];
  reverseY: boolean;
  samples: number;
  constructor(options: TIFFImageryProviderOptions & {
    /** 
     * @deprecated 
     * Deprecated after [email protected]+, you can use fromUrl instead
     * @example 
     * const provider = await TIFFImageryProvider.fromUrl(url)
     */
    url?: string | File | Blob;
  });

  get isDestroyed(): boolean;
  destroy(): void;
  
  static fromUrl(url: string | File | Blob, options?: TIFFImageryProviderOptions): Promise<TIFFImageryProvider>;
}

interface TIFFImageryProviderOptions {
  requestOptions?: {
    /** defaults to false */
    forceXHR?: boolean;
    headers?: Record<string, any>;
    credentials?: boolean;
    /** defaults to 0 */
    maxRanges?: number;
    /** defaults to false */
    allowFullFile?: boolean;
    [key: string]: any;
  };
  credit?: string;
  tileSize?: number;
  maximumLevel?: number;
  minimumLevel?: number;
  enablePickFeatures?: boolean;
  hasAlphaChannel?: boolean;
  renderOptions?: TIFFImageryProviderRenderOptions;
  /**
   * If TIFF's projection is not EPSG:4326 or EPSG:3857, you can pass the ``projFunc`` to handle the projection
   * @experimental
   */
  projFunc?: (code: number) => {
    /** projection function, convert [lon, lat] position to [x, y] */
    project: ((pos: number[]) => number[]);
    /** unprojection function, convert [x, y] position to [lon, lat] */
    unproject: ((pos: number[]) => number[]);
  } | undefined;
  /** cache size, defaults to 100 */
  cacheSize?: number;
  /** resample web worker pool size, defaults to the number of CPUs available. When this parameter is `null` or 0, then the resampling will be done in the main thread. */
  workerPoolSize?: number;
}

type TIFFImageryProviderRenderOptions = {
  /** nodata value, default read from tiff meta */
  nodata?: number;
  /** Only valid for three band rendering, defaults to { 'black': 'transparent' } */
  colorMapping?: Record<string, string>;
  /** try to render multi band cog to RGB, priority 1 */
  convertToRGB?: boolean;
  /** priority 2 */
  multi?: MultiBandRenderOptions;
  /** priority 3 */
  single?: SingleBandRenderOptions;
  /** resample method, defaults to nearest */
  resampleMethod?: 'bilinear' | 'nearest';
}

interface SingleBandRenderOptions {
  /** band index start from 1, defaults to 1 */
  band?: number;

  /**
   * The color scale image to use.
   */
  colorScaleImage?: HTMLCanvasElement | HTMLImageElement;

  /**
   * The name of a named color scale to use.
   */
  colorScale?: ColorScaleNames;

  /** custom interpolate colors, [stopValue(0 - 1), color] or [color], if the latter, means equal distribution 
   * @example
   * [[0, 'red'], [0.6, 'green'], [1, 'blue']]
  */
  colors?: [number, string][] | string[];

  /** Determine whether to use the true value range for custom color ranges, defaults to false */
  useRealValue?: boolean;

  /** defaults to continuous */
  type?: 'continuous' | 'discrete';

  /**
   * The value domain to scale the color.
   */
  domain?: [number, number];

  /**
   * Range of values that will be rendered, values outside of the range will be transparent.
   */
  displayRange?: [number, number];

  /**
   * Set if displayRange should be used.
   */
  applyDisplayRange?: boolean;

  /**
   * Whether or not values below the domain shall be clamped.
   */
  clampLow?: boolean;

  /**
   * Whether or not values above the domain shall be clamped (if not defined defaults to clampLow value).
   */
  clampHigh?: boolean;
  
  /**
   * Sets a mathematical expression to be evaluated on the plot. Expression can contain mathematical operations with integer/float values, band identifiers or GLSL supported functions with a single parameter.
   * Supported mathematical operations are: add '+', subtract '-', multiply '*', divide '/', power '**', unary plus '+a', unary minus '-a'.
   * Useful GLSL functions are for example: radians, degrees, sin, asin, cos, acos, tan, atan, log2, log, sqrt, exp2, exp, abs, sign, floor, ceil, fract.
   * Don't forget to set the domain parameter!
   * @example 
   * '-2 * sin(3.1415 - b1) ** 2'
   * '(b1 - b2) / (b1 + b2)'
   */
  expression?: string;
}

interface MultiBandRenderOptions {
  /** Band value starts from 1 */
  r?: {
    band: number;
    min?: number;
    max?: number;
  };
  g?: {
    band: number;
    min?: number;
    max?: number;
  };
  b?: {
    band: number;
    min?: number;
    max?: number;
  };
}


/** see https://observablehq.com/@d3/color-schemes */
type ColorScaleNames = 'viridis' | 'inferno' | 'turbo' | 'rainbow' | 'jet' | 'hsv' | 'hot' | 'cool' | 'spring' | 'summer' | 'autumn' | 'winter' | 'bone' | 'copper' | 'greys' | 'ylgnbu' | 'greens' | 'ylorrd' | 'bluered' | 'rdbu' | 'picnic' | 'portland' | 'blackbody' | 'earth' | 'electric' | 'magma' | 'plasma' | 'redblue' | 'coolwarm' | 'diverging_1' | 'diverging_2' | 'blackwhite' | 'twilight' | 'twilight_shifted';