Google Earth Enterprise overlay

Liem · June 29, 2023, 9:06am

Hi,
I wrote a new class implementation for cesium native that supports google earth enterprise map overlay as a Cesium for unity component. I have based it on top of BingMapsRasterOverlay class.
the component displays the map tiles right to the zoom level so it seems.
The problem is a small offset on the y-axis into the wrong world coordinates in the mapping projection, as far as I know, Google Earth Enterprise supports Mercator Web WGS84 just like Bing (and Google) Maps.

For example: coordinates of Taipei city gets an East China Sea tile map close the China coast.

Please advice as we couldn’t figure out what would be the differences in coordinates tile creation google earth enterprise.

Thanks

Kevin_Ring · June 29, 2023, 12:03pm

The implementation in CesiumJS might be useful as a reference:

github.com

CesiumGS/cesium/blob/main/packages/engine/Source/Scene/GoogleEarthEnterpriseImageryProvider.js

import Check from "../Core/Check.js";
import Credit from "../Core/Credit.js";
import decodeGoogleEarthEnterpriseData from "../Core/decodeGoogleEarthEnterpriseData.js";
import defaultValue from "../Core/defaultValue.js";
import defined from "../Core/defined.js";
import deprecationWarning from "../Core/deprecationWarning.js";
import Event from "../Core/Event.js";
import GeographicTilingScheme from "../Core/GeographicTilingScheme.js";
import GoogleEarthEnterpriseMetadata from "../Core/GoogleEarthEnterpriseMetadata.js";
import loadImageFromTypedArray from "../Core/loadImageFromTypedArray.js";
import CesiumMath from "../Core/Math.js";
import Rectangle from "../Core/Rectangle.js";
import Request from "../Core/Request.js";
import Resource from "../Core/Resource.js";
import RuntimeError from "../Core/RuntimeError.js";
import TileProviderError from "../Core/TileProviderError.js";
import * as protobuf from "protobufjs/dist/minimal/protobuf.js";

/**
 * @private

This file has been truncated. show original

Beyond that, I’m not sure what might be wrong. But if you shared some screenshots of the problem, something might jump out at me.

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Google Earth Enterprise overlay

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