[iTowns-user] Elevation Layers and supported formats

Tue Jan 28 08:39:28 PST 2020

Adrien,

Thank you for that example code reference, it was exactly what I needed. I had created a GeoTiff but could only get it to export from a Geoserver, so far, as a jpeg or png. Once I got the configuration of the elevation layer correct by adding those elevation attributes (useColorTextureElevation, colorTextureElevationMinZ, colorTextureElevationMaxZ) I can start to see elevation.

image/x-bil;bits=32 is just the mime type correct? I assume that's the standard mime type definition for .bil files?

Also thank you for the information on other formats.

Charlie Dalton

________________________________
From: Adrien Berthet <Adrien.Berthet at ign.fr>
Sent: Tuesday, January 28, 2020 3:40 AM
To: Dalton, Charlie; itowns-user at lists.osgeo.org
Subject: [EXTERNAL] RE:Elevation Layers and supported formats

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 [github.com]<https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_iTowns_itowns_blob_master_examples_view-5F25d-5Fmap.html-23L80-2DL98&d=DwMGaQ&c=Nwf-pp4xtYRe0sCRVM8_LWH54joYF7EKmrYIdfxIq10&r=Fl7m0-OlsZZvduoi329f4xK0m9fk9MzQJHES5KmUnJU&m=J6YHpMjrAG0lKRH9osWMxGMElNLyjeMnkbewm6Eb03c&s=YXMyJ_1TFlfXeTo5rBdQYIDIwIU05pOjH3nedbUs4e4&e=>

________________________________
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 [itowns-project.org]<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.itowns-2Dproject.org_itowns_docs_-23api_Source_WMSSource&d=DwMGaQ&c=Nwf-pp4xtYRe0sCRVM8_LWH54joYF7EKmrYIdfxIq10&r=Fl7m0-OlsZZvduoi329f4xK0m9fk9MzQJHES5KmUnJU&m=J6YHpMjrAG0lKRH9osWMxGMElNLyjeMnkbewm6Eb03c&s=RKZXWSupbEVUApI6IwJXuUcY8GJxo9M1qFtZB2USo4Q&e=>). 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 [itowns-project.org]<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.itowns-2Dproject.org_itowns_docs_-23api_Provider_Fetcher&d=DwMGaQ&c=Nwf-pp4xtYRe0sCRVM8_LWH54joYF7EKmrYIdfxIq10&r=Fl7m0-OlsZZvduoi329f4xK0m9fk9MzQJHES5KmUnJU&m=J6YHpMjrAG0lKRH9osWMxGMElNLyjeMnkbewm6Eb03c&s=ed7MF5IqVZE7VPsK9dz1dD8tyb6lWjm-FWeyGlriM50&e=>), 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 [threejs.org]<https://urldefense.proofpoint.com/v2/url?u=https-3A__threejs.org_docs_-23api_en_textures_DataTexture&d=DwMGaQ&c=Nwf-pp4xtYRe0sCRVM8_LWH54joYF7EKmrYIdfxIq10&r=Fl7m0-OlsZZvduoi329f4xK0m9fk9MzQJHES5KmUnJU&m=J6YHpMjrAG0lKRH9osWMxGMElNLyjeMnkbewm6Eb03c&s=Up13idugRhJOQYWlp5Y-6WuvxQmXRjE7Ftjdw9MOoZw&e=>), 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 [github.com]<https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_iTowns_itowns_blob_master_src_Converter_textureConverter.js-23L42-2DL49&d=DwMGaQ&c=Nwf-pp4xtYRe0sCRVM8_LWH54joYF7EKmrYIdfxIq10&r=Fl7m0-OlsZZvduoi329f4xK0m9fk9MzQJHES5KmUnJU&m=J6YHpMjrAG0lKRH9osWMxGMElNLyjeMnkbewm6Eb03c&s=kwbkUYDR2rlagvTiPwsbYc3cvJA9Vh-5v1QPwudKEM8&e=>) 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 [github.com]<https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_iTowns_itowns_blob_master_src_Provider_DataSourceProvider.js&d=DwMGaQ&c=Nwf-pp4xtYRe0sCRVM8_LWH54joYF7EKmrYIdfxIq10&r=Fl7m0-OlsZZvduoi329f4xK0m9fk9MzQJHES5KmUnJU&m=J6YHpMjrAG0lKRH9osWMxGMElNLyjeMnkbewm6Eb03c&s=hrKm-u4R9qXUbf080ODb-VlbMhyaRRc9ZEgfQnuH6ac&e=>

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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