KML Markers movement with 3D Terrain

Hello everybody,

I would like to make a question about some markers on a cesium map with terrain.
I have some issues on the cesium map when I try to load some KML files. When KML file is loaded, the markers are shown on the correct position but as soon as I start turning the globe with ctrl left mouse button the markers also move.
As the same way, when I zoom in to the marker and you move the globe to left, right up or down the markers also move to a different position.
Here is an example of what I mean. When you turn the globe you will see that the content also moves which in my opinion should not move.

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://earth.google.com/kml/2.1" xmlns:gx="http://www.google.com/kml/ext/2.2">
<Document>
<name>A la ermita de Sis (PR-HU 47)</name>
<description><![CDATA[Ruta lineal siguiendo el PR-HU 47 que transitas por un camino tallado en la roca; visita un mirador y se detiene en antiguas bordas, antes del llegar a la rec&oacute;ndita ermita rom&aacute;nica de Sis.
El recorrido se inicia desde el puente medieval del pueblo de Beranuy. Tras cruzar el r&iacute;o Is&aacute;bena, comienza el ascenso por un camino hormigonado que es el que conecta todos los barrios. El repecho es bastante fuerte en este primer tramo.
A los pocos metros del inicio, la ruta llega a la intersecci&oacute;n del GR 18.1 y del PR-HU 47, que es el que lleva a la ermita de Sis. Unos metros m&aacute;s arriba, aparece la iglesia de la Asunci&oacute;n, con torre de estilo rom&aacute;nico lombardo.
Tras la visita al templo, aparece un nuevo cruce, donde se termina el camino hormigonado y la ruta toma un sendero ascendente, siguiendo el PR. A partir de ahora, y durante la mayor parte del sendero, lo que va a predominar es la subida, paredes de conglomerado, suelo empedrado y cada vez mejores vistas del valle del Is&aacute;bena.
Despu&eacute;s de varias lazadas que ayudan a superar la pendiente por el Cam&iacute; del Grau o Camino del Grado, excavado a pico y pala, el peque&ntilde;o recorrido pasa junto a una pared en la que hay un hueco que recibe el nombre de Cova las Canals.
El continuo zig-zag ayuda a subir sin demasiada dificultad y tras la primera media hora de caminata el recorrido llega a un alargado morr&oacute;n, conocido como Serra o Serrau de Las Creus.
El sendero sigue las marcas blancas y amarillas y se adentra en un paisaje de pinos y encinas. Tras varias lazadas, llega a un rinc&oacute;n llamado reposad&oacute;. Se encuentra al final del repecho y est&aacute; resguardado del viento del norte. Aqu&iacute;, paraban a descansar los que antiguamente sub&iacute;an a las bordas de Beranuy a trabajar. Adem&aacute;s, en este punto la senda se ha convertido en una trocha. Poco a poco, la ruta se presenta en un cruce que aunque est&aacute; bien indicado, es preciso prestar atenci&oacute;n. No hay que seguir la trocha sino girar a la derecha y volver al camino viejo.
Desde el desv&iacute;o, en pocos metros se llega al final de la fuerte subida, donde se ubica un poste direccional. En este punto, el PR-HU 47 se desv&iacute;a unos 500 metros para llegar al mirador del Mallo. Desde aqu&iacute; las vistas son impresionantes entre las que destaca la panor&aacute;mica del Turb&oacute;n. Adem&aacute;s de esta m&iacute;tica monta&ntilde;a tambi&eacute;n se puede ver la Pe&ntilde;a Monta&ntilde;esa, el Pico Gallinero, Pico Maldito, el Aneto, Vallibierna, el Pico Russell y una amplia visi&oacute;n del valle del Is&aacute;bena.
Desde el balc&oacute;n, regresa al cruce para continuar direcci&oacute;n a la ermita de Sis, tal y como indica uno de los postes. El siguiente tramo corresponde al punto m&aacute;s elevado de toda la ruta. Adem&aacute;s es la l&iacute;nea divisoria entre el barranco de Riba y el de Partarriu, as&iacute; a los pocos minutos del cruce el sendero llega a la zona de las bordas de Beranuy.
Al pasar las construcciones, aparece una nueva bifurcaci&oacute;n se&ntilde;aliza. El recorrido toma la senda que indica a la ermita y se adentra en un bosque muy variado, entre avellanos, chopos, robles y bojes. A los pocos metros llega a esperada ermita rom&aacute;nica de Sis.]]></description>
<Style id="Mirador">
<IconStyle>
<scale>0.7</scale>
<Icon><href>wpt-mirador.png</href></Icon>
</IconStyle>
</Style>
<Style id="Construcción">
<IconStyle>
<scale>0.7</scale>
<Icon><href>wpt-cabana.png</href></Icon>
</IconStyle>
</Style>
<Style id="Cima">
<IconStyle>
<scale>0.7</scale>
<Icon><href>wpt-cima.png</href></Icon>
</IconStyle>
</Style>
<Style id="Cruce">
<IconStyle>
<scale>0.7</scale>
<Icon><href>wpt-cruce.png</href></Icon>
</IconStyle>
</Style>
<Style id="Población">
<IconStyle>
<scale>0.7</scale>
<Icon><href>wpt-poblacion.png</href></Icon>
</IconStyle>
</Style>
<Placemark>
<name>MIRADOR DEL MALLO</name>
<description><![CDATA]></description>
<styleUrl>#Mirador</styleUrl><Point><coordinates>0.599129136296623,42.3596144923741,1482.02633166719</coordinates></Point>
</Placemark>
<Placemark>
<name>IGLESIA DE BERANUY</name>
<description><![CDATA]></description>
<styleUrl>#Construcción</styleUrl><Point><coordinates>0.595014998793055,42.3668764475663,1062.01614024574</coordinates></Point>
</Placemark>
<Placemark>
<name>SERRA DE LAS CREUS</name>
<description><![CDATA]></description>
<styleUrl>#Cima</styleUrl><Point><coordinates>0.595774502137053,42.3628850753179,1261.0236217885</coordinates></Point>
</Placemark>
<Placemark>
<name>CRUCE</name>
<description><![CDATA]></description>
<styleUrl>#Cruce</styleUrl><Point><coordinates>0.603463302020541,42.3612271098811,1467.01749838895</coordinates></Point>
</Placemark>
<Placemark>
<name>CRUCE - POSTE</name>
<description><![CDATA]></description>
<styleUrl>#Cruce</styleUrl><Point><coordinates>0.605096827530535,42.3600995888771,1511.01783541796</coordinates></Point>
</Placemark>
<Placemark>
<name>BORDAS DE BERANUY</name>
<description><![CDATA]></description>
<styleUrl>#Construcción</styleUrl><Point><coordinates>0.607744782385268,42.3581557308888,1528.01862715205</coordinates></Point>
</Placemark>
<Placemark>
<name>CRUCE DE LA ERMITA DE SIS</name>
<description><![CDATA]></description>
<styleUrl>#Cruce</styleUrl><Point><coordinates>0.610164088410155,42.3583953234789,1527.0150923258</coordinates></Point>
</Placemark>
<Placemark>
<name>ERMITA DE SIS</name>
<description><![CDATA[El origen de esta construcción se remonta al siglo XII y es uno de los ejemplos románicos que tan presentes están en La Ribagorza.<br>
Parece ser que un ermitaño religioso cisterciense llamado Pedro el Monje, o Pere el Montje, edificó en su retiro la pequeña ermita tras encontrar en este paraje una imagen de la virgen.<br>
Es de planta rectangular y tiene la cabecera en semicírculo orientada al este, hacia Jerusalén. Sus recios muros están culminados con la espadaña de la fachada y está construida en toba.<br>
Junto al pequeño edificio aparecen los restos de la abadía y dentro aparece la austeridad de un templo cuya imagen de la virgen se encuentra hoy en la iglesia de Beranuy y hasta 1936 se venía en romería cada 26 de junio.
]]></description>
<styleUrl>#Construcción</styleUrl><Point><coordinates>0.620505355610712,42.3504517128553,1410.01892910213</coordinates></Point>
</Placemark>
<Placemark>
<name>BERANUY</name>
<description><![CDATA[Beranuy tiene un caserío repartido por la margen izquierda del río Isábena. Sus casas están dispuestas en una curiosa distribución ya que, con el paso del tiempo, los barrios fueron mudando del alto a zonas más bajas. La distribución actual así lo refleja: las casas más antiguas en la parte más elevada y las más modernas junto a la carretera.<br>
Además de un puente medieval de dos arcos de medio punto sobre el río Isábena, también destaca la iglesia de la Asunción. Es románica y su construcción se calcula entre los siglos XI y XII a pesar de estar reformada en el XVI. De toda la obra, lo que más llama la atención es la torre de estilo románico lombardo.
]]></description>
<styleUrl>#Población</styleUrl><Point><coordinates>0.592212710378266,42.3699784319326,992.013095513162</coordinates></Point>
</Placemark>
<Placemark>
<name>CRUCE DEL GR 18.1 Y EL PR-HU 47</name>
<description><![CDATA]></description>
<styleUrl>#Cruce</styleUrl><Point><coordinates>0.593002658953846,42.3683740866655,1021.01549576858</coordinates></Point>
</Placemark>
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Is there a way to fix the position of markers?

Thanks in advance for any feedback.

Hi there,

Make sure that you set your KML to clampToGround when you add it to your viewer, like this:

var options = {
camera : viewer.scene.camera,
canvas : viewer.scene.canvas,
clampToGround: true
};
viewer.dataSources.add(Cesium.KmlDataSource.load(‘path/to/kml’, options));

In your KML file, you’ll also need to add the following to your LineString to enable clamp to ground:

1

Hope that helps!

  • Rachel

Hi Rachel,

than you so much for your reply. However, I was already including these options when I load KML file.
var options = {
   camera : viewer.scene.camera,
   canvas : viewer.scene.canvas,
   clampToGround: true
};

As you tell me, I have added <tessellate>1</tessellate> to my LineString in KML file and Cesium shows an error like this:
An error occurred while rendering. Rendering has stopped.
RangeError: Invalid array length
RangeError: Invalid array length
    at updateFrustums (http://aragon3d.grupotecopy.es/Build/CesiumUnminified/Cesium.js:2795:23978)
    at createPotentiallyVisibleSet (http://aragon3d.grupotecopy.es/Build/CesiumUnminified/Cesium.js:2795:29488)
    at executeCommandsInViewport (http://aragon3d.grupotecopy.es/Build/CesiumUnminified/Cesium.js:2795:48229)
    at updateAndExecuteCommands (http://aragon3d.grupotecopy.es/Build/CesiumUnminified/Cesium.js:2795:43683)
    at render (http://aragon3d.grupotecopy.es/Build/CesiumUnminified/Cesium.js:2795:55997)
    at Scene.render (http://aragon3d.grupotecopy.es/Build/CesiumUnminified/Cesium.js:2795:57113)
    at CesiumWidget.render (http://aragon3d.grupotecopy.es/Build/CesiumUnminified/Cesium.js:3046:46168)
    at render (http://aragon3d.grupotecopy.es/Build/CesiumUnminified/Cesium.js:3046:29595)

Is there anything else wrong in KML file?

Thanks in advance.

Hi there,

We got this to work yesterday with the fix we described, so the must be a difference in how we’re running it. What version of Cesium are you using?

Best,

  • Rachel

Hi Rachel,

I have checked that problem with different versions of Cesium and the problem continues. But if I remove the terrainProvider eveything works correctly.

Regards.

Hello,

I’ve attached the update KML file that worked for me. And here is the code example I used:

var viewer = new Cesium.Viewer(‘cesiumContainer’, {
terrainProvider: new Cesium.CesiumTerrainProvider({
url : ‘https://assets.agi.com/stk-terrain/world’,
requestWaterMask : true,
requestVertexNormals : true
}),
baseLayerPicker: false});
var options = {
camera : viewer.scene.camera,
canvas : viewer.scene.canvas,
clampToGround: true
};
var ds = viewer.dataSources.add(Cesium.KmlDataSource.load(’…/…/SampleData/kml/test-markers.kml’, options));
viewer.zoomTo(ds);

``

Let us know if you’re still having trouble.

Best,

Hannah

test-markers.kml (31.6 KB)

Hello,

When I try to load your KML the following error is shown:
An error occurred while rendering. Rendering has stopped.
undefined
RangeError: Invalid array length
RangeError: Invalid array length

Regards.

Make sure you’re using the latest version of Cesium. Cesium 1.31 can be downloaded from here: http://cesiumjs.org/downloads.html
After you upgrade to the latest version, try clearing your cache and cookies to see if that fixes the problem.

If you’re still having trouble, which browser and OS are you using?

Best,

Hannah