adding new raster layers: water, population, forest gain

cloud_functions/earth_engine_tiler/src/geeAssets/forest-gain.ts

@@ -0,0 +1,39 @@
+import { ContinuousDataset } from './earth-engine-dataset';
+import ee from '@google/earthengine';
+import { EarthEngineUtils } from "../earth-engine-utils";
+
+export const ForestGain: ContinuousDataset = {
+  assetPath: {
+    default: "projects/glad/GLCLU2020/Forest_gain"
+  },
+
+  vizParams: {
+    bands: ['b1'],
+    min: 0,
+    max: 1, 
+    palette: ['#008000']
+  },
+
+  areYearsValid(startYear?: number, endYear?: number): boolean {
+    // This Asset is static, and year selector is irrelevant
+    return true;
+  },
+
+  getEEAsset() {
+    // Apply mask
+    const rawImage = ee.Image(this.assetPath.default);
+    const maskedImage = rawImage
+      .select('b1')
+      .updateMask(rawImage); // Mask out no-data pixels
+
+    return maskedImage;
+  },
+
+  async getMapUrl(z, x, y, startYear, endYear) {
+    const image = this.getEEAsset()
+
+    const mapId = await EarthEngineUtils.getMapId(image, this.vizParams);
+
+    return ee.data.getTileUrl( mapId, x, y, z );
+  },
+};

cloud_functions/earth_engine_tiler/src/geeAssets/population-count.ts

@@ -0,0 +1,50 @@
+import { ContinuousDataset } from './earth-engine-dataset';
+import ee from '@google/earthengine';
+import { EarthEngineUtils } from "../earth-engine-utils";
+
+export const PopulationCount: ContinuousDataset = {
+  assetPath: {
+    1975: "JRC/GHSL/P2023A/GHS_POP/1975",
+    1990: "JRC/GHSL/P2023A/GHS_POP/1990",
+    2020: "JRC/GHSL/P2023A/GHS_POP/2020"
+  },
+
+  vizParams: {
+    bands: ['population_count'],
+    min: 0.0,
+    max: 100.0,
+    palette: ['000004', '320A5A', '781B6C', 'BB3654', 'EC6824', 'FBB41A', 'FCFFA4']
+  },
+
+  areYearsValid(startYear?: number, endYear?: number): boolean {
+    const validYears = [1975, 1990, 2020];
+    if (!startYear || !validYears.includes(startYear)) {
+      throw new Error(`Start Year '${startYear}' is not valid. Valid years are: ${validYears.join(", ")}`);
+    }
+    return true;
+  },
+
+  getEEAsset(startYear: string) {  // Change the parameter to string as per the type definition
+    // Load the asset for the specified year
+    const assetPath = this.assetPath[parseInt(startYear)]; // Convert the string to number if necessary
+    if (!assetPath) {
+      throw new Error(`Asset not found for year '${startYear}'`);
+    }
+
+    // Load the image and apply masking logic
+    const rawImage = ee.Image(assetPath);
+    return rawImage.updateMask(rawImage.gt(0)); // Mask out pixels with value 0
+  },
+
+  async getMapUrl(z: number, x: number, y: number, startYear: number, endYear?: number) {
+    // Validate the year and get the asset
+    this.areYearsValid(startYear, endYear);
+    const image = this.getEEAsset(startYear);
+
+    // Generate the mapId with visualization parameters
+    const mapId = await EarthEngineUtils.getMapId(image, this.vizParams);
+
+    // Return the Tile URL
+    return ee.data.getTileUrl(mapId, x, y, z);
+  },
+};

cloud_functions/earth_engine_tiler/src/geeAssets/surface-water.ts

@@ -0,0 +1,34 @@
+import { ContinuousDataset } from './earth-engine-dataset';
+import ee from '@google/earthengine';
+import {EarthEngineUtils} from "../earth-engine-utils";
+
+
+export const SurfaceWater: ContinuousDataset = {
+  assetPath: {
+    default: "JRC/GSW1_4/GlobalSurfaceWater"
+  },
+
+  vizParams: {
+    bands: ['occurrence'],
+    min: 0,
+    max: 100,
+    palette: ['ffffff', 'ffbbbb', '0000ff']
+  },
+
+  areYearsValid (startYear?: number, endYear?: number) : boolean {
+    //This Asset is static, and year selector are irrelevant
+    return true;
+  },
+
+  getEEAsset() {
+    return ee.Image(this.assetPath.default);
+  },
+
+  async getMapUrl(z, x, y, startYear, endYear) {
+    const image = this.getEEAsset()
+
+    const mapId = await EarthEngineUtils.getMapId(image, this.vizParams);
+
+    return ee.data.getTileUrl( mapId, x, y, z );
+  },
+};

cloud_functions/earth_engine_tiler/src/index.ts

@@ -13,6 +13,9 @@ import {GriddedLivestockGoat} from './geeAssets/gridded-livestock-goat';
 import {GriddedLivestockHorse} from './geeAssets/gridded-livestock-horse'; 
 import {GriddedLivestockBuffalo} from './geeAssets/gridded-livestock-buffalo'; 
 import {GriddedLivestockSheep} from './geeAssets/gridded-livestock-sheep'; 
+import {SurfaceWater} from './geeAssets/surface-water';
+import {ForestGain} from './geeAssets/forest-gain';
+import { PopulationCount } from './geeAssets/population-count';
 import {EarthEngineDataset} from "./geeAssets/earth-engine-dataset";
 import {TileRequestDTO, Tilesets} from "./tile-request.dto";
 import {default as fetch , Response as FetchResponse} from "node-fetch";
@@ -31,6 +34,9 @@ const assets: Record<Tilesets, EarthEngineDataset> = {
   [Tilesets.gridded_livestock_horse]: GriddedLivestockHorse,
   [Tilesets.gridded_livestock_buffalo]: GriddedLivestockBuffalo,
   [Tilesets.gridded_livestock_sheep]: GriddedLivestockSheep,
+  [Tilesets.surface_water]: SurfaceWater,
+  [Tilesets.forest_gain]: ForestGain,
+  [Tilesets.population_count]: PopulationCount
 }
 
 //We're using express to simplify path parameter parsing for the Tiles endpoint

cloud_functions/earth_engine_tiler/src/tile-request.dto.ts

@@ -11,7 +11,10 @@ export enum Tilesets {
   gridded_livestock_goat = "gridded_livestock_goat",
   gridded_livestock_horse = "gridded_livestock_horse",
   gridded_livestock_buffalo = "gridded_livestock_buffalo",
-  gridded_livestock_sheep = "gridded_livestock_sheep"
+  gridded_livestock_sheep = "gridded_livestock_sheep",
+  surface_water = "surface_water",
+  forest_gain = "forest_gain",
+  population_count = "population_count"
 }