github.com/cconcannon/czml

A module for interfacing with .czml files and data.

More info about the Cesium Ecosystem can be found on cesium.com

The spec for .czml files seems to be maintained here.

Use

Import the Module

import (
	...

	"github.com/cconcannon/czml"
)

Initialize a CZML data structure

var c czml.Czml

c.InitializeDocument("name")

Create & Add CZML Packets to CZML data

packet := czml.CreateEmptyPacket("id", "name")

c.AddPacket(packet)

Note: Packet field types and sub-types are available, but constructors and schema-checking are not, so you must use some other means to validate your packet schema

Create JSON binary

json, err := czml.Marshal(c)

About the CZML format

• .czml files are valid .json
• a .czml file is an array of Packet objects
• the first Packet in a .czml file must be the document Packet

Opinions in Implementation

Most struct fields are references, and this is by design. The core of this reasoning is that default values of cesium properties are a mix of zero and non-zero values across numerical and boolean types. To preserve non-zero (i.e. 1.0, true) implied default values, all fields except for strings have been implemented as reference values so that non-presence does not equate to zero-value.

Future Development

Most of the type implementations are untested. There's a lot of opportunity for further development here - add testing, implement constructors, etc.

The documentation about value formats for many of the .czml properties, especially those around coordinates, is relatively unclear. Many of the types declared here could probably be updated to reflect valid data.

Contributing

Yes, please.