Cesium issue positioning labels for GeoJSON markers - label

Question

I'm displaying some GeoJSON as markers in Cesium; they do not have altitude, so I'm using clampToGround: true. This all works.
When I try to label the markers, the labels only display when I'm zoomed far out. When I zoom in the labels disappear "underground", which is under the Terrain "layer".
How to solve this? I've looked at this, but it didn't help in my case. This neither.
The code:
const viewer = new Cesium.Viewer('cesiumContainer', {
terrainProvider: Cesium.createWorldTerrain(),
timeline: false, // Hide clock thing
animation: false, // ditto
});
// Add Cesium OSM Buildings, a global 3D buildings layer.
const buildingTileset = viewer.scene.primitives.add(Cesium.createOsmBuildings());
// Fly the camera to the given longitude, latitude, and height.
viewer.camera.flyTo({
destination : Cesium.Cartesian3.fromDegrees(11.952996, 57.671910, 400),
orientation : {
heading : Cesium.Math.toRadians(0.0),
pitch : Cesium.Math.toRadians(-15.0),
}
});
var promise = Cesium.GeoJsonDataSource.load('data/botaniska_play.geojson', {
clampToGround: true,
markerColor: Cesium.Color.DARKGREEN,
});
promise.then (function (dataSource) {
viewer.dataSources.add (dataSource);
var entities = dataSource["_entityCollection"]["_entities"]["_array"];
entities.forEach (entity => {
// Add (and poistion?) label
entity.label = new Cesium.LabelGraphics ({
text: entity['_properties']['art']._value,
//eyeOffset: new Cesium.Cartesian3 (0, 10, 0),
horizontalOrigin: Cesium.HorizontalOrigin.LEFT,
verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
pixelOffset: new Cesium.Cartesian2(0.0, -40.0), // Show above ground?
});
});
});
Snippet of the geojson:
{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Point","coordinates":[11.9531552705143,57.6814657645123]},"properties":{"ogc_fid":6,"geom":"{\"type\":\"Point\",\"coordinates\":[11.9531552705143,57.6814657645123]}","plats":"Test Plats","besikt_datum":"2013-06-07","trad_id":"6","art":"Magnolia stellata","status":null,"aldersfas":"Gammalt","hojd":9,"krondiameter":9,"stamdiameter":56,"skador":"Lindriga","vitalitet":"God","anmarkningar":"Vackert","rekommendationer":null,"risk":"Låg","resterande_risk":"-","atgards_datum":null,"atgard_gjort":null,"nasta_besiktning":"2014-06-07","stabiliserings_datum":null}},{"type":"Feature","geometry":{"type":"Point","coordinates":[11.9500765558289,57.6815427053798]},"properties":{"ogc_fid":21,"geom":"{\"type\":\"Point\",\"coordinates\":[11.9500765558289,57.6815427053798]}","plats":null,"besikt_datum":"2017-06-09","trad_id":null,"art":"Acer griseum","status":null,"aldersfas":"Vuxet","hojd":9,"krondiameter":8,"stamdiameter":50,"skador":null,"vitalitet":"God","anmarkningar":"Alléträd högt naturvärde\n","rekommendationer":null,"risk":"Låg","resterande_risk":null,"atgards_datum":null,"atgard_gjort":null,"nasta_besiktning":null,"stabiliserings_datum":null}},{"type":"Feature","geometry":{"type":"Point","coordinates":[11.9514171990732,57.6828566964894]},"properties":{"ogc_fid":3,"geom":"{\"type\":\"Point\",\"coordinates\":[11.9514171990732,57.6828566964894]}","plats":"Test Plats","besikt_datum":"2013-06-07","trad_id":"3","art":"Populus siemonii","status":null,"aldersfas":"Gammalt","hojd":15,"krondiameter":14,"stamdiameter":60,"skador":"Inga","vitalitet":"God","anmarkningar":"Fin","rekommendationer":null,"risk":"Låg","resterande_risk":"-","atgards_datum":null,"atgard_gjort":null,"nasta_besiktning":"2014-06-07","stabiliserings_datum":null}} ...

Answer 1

Try add disableDepthTestDistance: Number.POSITIVE_INFINITY to LabelGraphics options