[iTowns-user] Elevation Layers and supported formats

[Adrien Berthet]

You can also see here that iTowns support color-coded elevation (on a grey scale):
https://github.com/iTowns/itowns/blob/master/examples/view_25d_map.html#L80-L98

________________________________
De : ITowns-user [itowns-user-bounces at lists.osgeo.org] de la part de Adrien Berthet [Adrien.Berthet at ign.fr]
Envoyé : mardi 28 janvier 2020 09:17
À : Dalton, Charlie; itowns-user at lists.osgeo.org
Objet : Re: [iTowns-user] Elevation Layers and supported formats

Hi Charlie,


> First, can I create an elevation layer using WMS with iTowns or does it need to be a WMTS endpoint?


You can use a WMS endpoint without problem. In the examples, the WMTS endpoint is reached using a WMTSSource. If you want a WMS endpoint, use a WMSSource (http://www.itowns-project.org/itowns/docs/#api/Source/WMSSource). You can change the endpoint however you want, as it is completely independant from the layer (in almost all the case, yours being one).


> Second, will elevation only work with x-bil format and if not, what other formats may I use?


Here at IGN we only use the x-bil format, but you should be able to use any format your want, as long as you specify two things:

- the fetcher of the source: use one from Fetcher (http://www.itowns-project.org/itowns/docs/#api/Provider/Fetcher), and set it like wmsSourceInstance.fetcher = Fetcher.choosenMethod

- the parser of the source: do what you need to do, the output needs to be a THREE.DataTexture (https://threejs.org/docs/#api/en/textures/DataTexture), and specify it by writing wmsSourceInstance.parser = newParserMethod

- optional, the converter of the source: you can see here (https://github.com/iTowns/itowns/blob/master/src/Converter/textureConverter.js#L42-L49) what the converter is doing for the data, feel free to override it if needed by setting wmsSourceInstance.convert = newConvertMethod


All of these methods are called in DataSourceProvider, you can read it if you want more precision on what options are given and how it chains: https://github.com/iTowns/itowns/blob/master/src/Provider/DataSourceProvider.js


Hope it helps !


Adrien

________________________________
De : ITowns-user [itowns-user-bounces at lists.osgeo.org] de la part de Dalton, Charlie [Charlie.Dalton at parsons.com]
Envoyé : lundi 27 janvier 2020 20:18
À : itowns-user at lists.osgeo.org
Objet : [iTowns-user] Elevation Layers and supported formats


I'm using iTowns, 2.15.0. I try to stay latest but three.js doesn't always get their typings updated which results in compilation errors in our typescript application.


​I'm attempting to expose an elevation layer in a Geoserver and so far my efforts produce a WMS endpoint (I have tried a single large GeoTiff, ImageMosaic with many geotiffs or Shapefile layer). The example packaged in iTowns uses a WMTS endpoint that serves x-bil images. Based on my searching in the code, xbil seems to be the one and only expected format based on:


ElevationLayer#update(...)

LayeredMaterialNodeProcessing#updateLayeredMaterialNodeElevation(...)

XbilParser#computeMinMaxElevation(...)

​

First, can I create an elevation layer using WMS with iTowns or does it need to be a WMTS endpoint?

Second, will elevation only work with x-bil format and if not, what other formats may I use?


Charlie Dalton

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