czml | Read and write CZML in Python

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Read and write CZML in Python

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Community Discussions

Trending Discussions on czml

How can I define a polygon entity using availability intervals in Cesium?

Is there a way to configure Cesium entities to be displayed as ICRF?

Access position values from loaded CZML data using Cesiumjs

QUESTION

How can I define a polygon entity using availability intervals in Cesium?

Asked 2020-Nov-05 at 11:31

I am defining a realy huge polygon that changes its position and shape using inertial reference frame.

First, I tryed to define a set of CZML polygons, each one with an availability and its coordinates like the "california" object in this sandcastle example, but this exceeds the maximum memory limit and blocks the browser and eventually the computer. Then, I had it working using only one polygon in CZML providing a list with an interval and the polygon shape coordinates, like the "dynamicPolygon" in the same sandcastle example.

Now I am trying to change the CZML implementation to use entities but the entity documentation allows to use a PolygonGraphics that allows to use a Property or a PolygonHierarchy to configure the shape, and I can not figure out how to do the same "dynamicPolygon" using entities.

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ANSWER

Answered 2020-Nov-05 at 11:31

You can use a CallbackProperty (that is a type of Property) in the hierarchy constructor option. There should not be issues with memory due to there is only one object and the positions are being calculated dynamically. You also can use a collection like TimeIntervalCollectionProperty and then ask for the value for an specific time.

Try to add the next code fragment in the Hello World Cesium sandcastle:

Source https://stackoverflow.com/questions/64578823

QUESTION

Is there a way to configure Cesium entities to be displayed as ICRF?

Asked 2020-Oct-22 at 19:33

My question is very similar to another one already solved.

I have to display a moving entity along with its path in ICRF. I previously had it working using CZML. But now I am replacing the CZML objects to entities. To configurate the entity's position I am using SampledPositionProperty and setting the reference frame in the constructor. The displayed result seems to be Earth fixed because the path looks like a spiral instead of an ellipse.

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ANSWER

Answered 2020-Oct-22 at 19:33

The shape of the path comes from the coordinates passed into the SampledPositionProperty.

You need to make sure the coordinates you're passing in have already been transformed into ICRF coordinates, forming an ellipse, not the Earth-fixed coordinates in the shape of a spiral.

Cesium will simply draw whatever shape you give it. The choice of reference frame on the SampledPositionProperty constructor there only controls whether your shape will be fixed to the Earth, or aligned to the ICRF frame over time, but it doesn't change the actual shape. So if you give it a spiral path, it will show you a spiral path. The conversion between coordinate systems is up to you (but can be done using Cesium helper functions, if needed).

Source https://stackoverflow.com/questions/64485298

QUESTION

Access position values from loaded CZML data using Cesiumjs

Asked 2020-May-16 at 20:08

I load in a CZML file into my app.js file [both files are provided below].

I'm able to access the name and id fields but not the position field. The position field contains cartographic values as 'time, longitude, latitude, altitude'. I'd like to access sets of these cartographic values so I can display them. For example, for the example below, I'd like to access position[0] as '0.00,-4.6,-38.4,250'. How do I do this?

I load in the data using 'Cesium.CzmlDataSource.load' as shown below. I'm also able to attach a new field like 'model' but not access the position field.

CZML file

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ANSWER

Answered 2020-May-16 at 20:08

By the time your CZML is imported as entities, those original positions have been converted. The entity.position object you're accessing is not an array, it's an instance of a SampledPositionProperty.

This property doesn't publicly expose all of its internal data, but you can request a position at a given time, using position.getValue(...).

Here's a Sandcastle Demo showing an entity position changing over time.

The code for that demo looks like this:

Source https://stackoverflow.com/questions/61835459

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