blocky terrain question about cesium-geoserverterrainprovider HOT 12 CLOSED

Hello

from what I see, it seems you don't use a good configuration of the bil/dds plugin. Did you try different configurations? What is your process to generate your tiff files?

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I am not using the bil/dds plugin. I just loaded 90m terrain files from http://srtm.csi.cgiar.org/download into an ImageMosaic in GeoServer then I simply configured my layer to use the mySLD.xml style from this project's github.

What is the best way? Is it the bil/dds plugin or maybe the GeotiffTranslate script?

var terrainProvider = new Cesium.GeoserverTerrainProvider({
	service : "WMTS",
	url : "http://localhost:8080/geoserver/gwc/service/wmts",
    layerName: "cite:srtm90",
    styleName: "mySLD",
    waterMask: true
});

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You should check the README.md. There is a comparison for each type and some hints for processing your data.

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Ok I got it to work for WMS in GeoServer 2.17 and Cesium 1.70.1 by doing the following:

• installing dds plugin from https://docs.geoserver.org/latest/en/user/community/dds/index.html via https://build.geoserver.org/geoserver/2.17.x/community-latest/

• using your example at https://github.com/kaktus40/Cesium-GeoserverTerrainProvider/blob/master/WMSParameters.md

• In GeoserverTerrainProvider.js, changing Cesium.defineProperties to Object.defineProperties

• In GeoserverTerrainProvider.js, changing "{Style}" to "{style}"

Thank you!

What is the way to get the best performance? Use service:"WMS" providing a gwc wms endpoint?

var terrainProvider = new Cesium.GeoserverTerrainProvider({
	service: "WMS",
	url : "http://localhost:8080/geoserver/cite/wms",
	layerName: "srtm90",
	heightMapWidth: 64,
	heightMapHeight: 64,
	offset: 0,
	highest: 12000,
	lowest: -500,
	styleName: "mySLD",
	hasStyledImage: true,
	waterMask: true,
	maxLevel: 11,
	formatImage: {format : "image/png",extension: "png"},
	formatArray: {
		format : "image/bil",
		postProcessArray : function(bufferIn, size,highest,lowest,offset) {
			var resultat;
			var viewerIn = new DataView(bufferIn);
			var littleEndianBuffer = new ArrayBuffer(size.height * size.width * 2);
			var viewerOut = new DataView(littleEndianBuffer);
			if (littleEndianBuffer.byteLength === bufferIn.byteLength) {
				// time to switch bytes!!
				var temp, goodCell = 0, somme = 0;
				for (var i = 0; i < littleEndianBuffer.byteLength; i += 2) {
					temp = viewerIn.getInt16(i, false)-offset;
					if (temp > lowest && temp < highest) {
						viewerOut.setInt16(i, temp, true);
						somme += temp;
						goodCell++;
					} else {
						var val = (goodCell == 0 ? 1 : somme / goodCell);
						viewerOut.setInt16(i, val, true);
					}
				}
				resultat = new Int16Array(littleEndianBuffer);
			}
			return resultat;
		}
	}
});

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Does GeoServer/GeoWebCache WMTS support .bil?
Whenever I try to use WMTS I get either blocky or spiky terrain using GeoserverTerrainProvider.js as it's just using .png or .jpeg and doesn't seem to go through the more accurate .bil pipeline.

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I ran the GeotiffTranslate on the srtm4.1 dataset (90m). It looks decent but the .bil solution seems to have more accurate terrain especially when viewing near street level. By this I mean, visually the .bil solution looks better. Has this been your experience?

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Do you believe the best solution could be this?

gdalbuildvrt mosaic.vrt c:\srtm90\*.tif

gdal_retile -ps 2048 2048 -overlap 0 -levels 6 -s_srs EPSG:4326 -r cubicspline -ot Int16 -co TILED=YES -co COMPRESS=DEFLATE -targetDir srtm90pyramid mosaic.vrt

The deploy srtm90pyramid as an ImagePyramid in GeoServer and use image/bil method?

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I'm good with closing this Issue. Thanks for your advice!

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