Trouble loading a CZML converted from a KML with the CZML writer DOTnet project.

CesiumJS
1

Hi,

I recently converted a KML file with the CZML writer you developped. (I got it from here : https://github.com/AnalyticalGraphicsInc/czml-writer). I used the command line tool provided to do so.

The producted czml file seems a valid JSON formatted file but when I try to load it in my Cesium project, my shapes are not printed at all.

So I was wondering if your command line tool was still properly working (if not it could be of great help to write down a big "DEPRECATED" in the Readme.md...)

Here is a fragment of the CZML file producted :

[
  {
    "id":"9b1a1e16-3003-4730-b2dc-5f3d9a51b98a",
    "label":{
      "show":false,
      "text":"Sensor1"
    },
    "position":{
      "cartographicRadians":[
        -0.03490658503988659,0.7853981633974483,100
      ]
    }
  },
  {
    "id":"13d8729f-929d-4c01-982d-bb3484e116b1",
    "polygon":{
      "material":{
        "solidColor":{
          "color":{
            "rgba":[
              1,1,254,191
            ]
          }
        }
      }
    },
    "vertexPositions":{
      "cartographicRadians":[
        -0.07016935687352018,0.7800553265846581,8172.971518,-0.07016935687352018,0.7821924648004328,5552.911972,-0.06803221865774566,0.7821924648004328,11564.441047,-0.06803221865774566,0.7800553265846581,8071.783921
      ]
    }
  }
]

According to what I found here (https://github.com/AnalyticalGraphicsInc/cesium/wiki/CZML-Content#position) the value of "cartographicRadians" should be like "[Time, Longitude, Latitude, Height, Time, Longitude, Latitude, Height, ...]" and in my file it seems more like "[ Longitude, Latitude, Height, Longitude, Latitude, Height, ...]" but I have no time informations in my KML so how am I supposed to construct my CZML?

If the CZML writer is obsolete, is your KML-branch mature enough to handle kml files properly?

Thanks,
Emmanuel

2

The online converter is largely obsolete and unmaintained. I’ve proposed getting rid of it altogether.

Cesium is in the process of adding native KML support (in the GitHub kml branch). I would recommend anyone who requires KML support to use that branch instead of the converter. The native support is already much better than the converter.

3

Your CZML loads correctly. It’s a very small area, so it will be hard to spot from a global view.

Try pasting this into Sandcastle:

http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=CZML.html&label=Showcases

require([‘Cesium’], function(Cesium) {

“use strict”;

var viewer = new Cesium.Viewer(‘cesiumContainer’);

var builtInCzml = [

{

“id”:“9b1a1e16-3003-4730-b2dc-5f3d9a51b98a”,

“label”:{

“show”:false,

“text”:“Sensor1”

},

“position”:{

“cartographicRadians”:[

-0.03490658503988659,0.7853981633974483,100

]

}

},

{

“id”:“13d8729f-929d-4c01-982d-bb3484e116b1”,

“polygon”:{

“material”:{

“solidColor”:{

“color”:{

“rgba”:[

1,1,254,191

]

}

}

}

},

“vertexPositions”:{

“cartographicRadians”:[

-0.07016935687352018,0.7800553265846581,8172.971518,-0.07016935687352018,0.7821924648004328,5552.911972,-0.06803221865774566,0.7821924648004328,11564.441047,-0.06803221865774566,0.7800553265846581,8071.783921

]

}

}

];

var czmlDataSource = new Cesium.CzmlDataSource();

czmlDataSource.load(builtInCzml, ‘Built-in CZML’);

viewer.dataSources.add(czmlDataSource);

var rectangle = new Cesium.Rectangle(-0.0701,0.7800, -0.0702,0.7821);

viewer.scene.camera.viewRectangle(rectangle);

Sandcastle.finishedLoading();

});

4

Thanks for your answers. I switched for the KML branch and everything is working good except for big kml files (i.e. exceeding 20 mo)

To be honest I hadn't tried to load the small fragment I provided you, it didn't work with the whole file I have. I managed to figure out that an error was raised by the parser : "scalar is required and must be a number.". Apparently some decimal values for the height attribute were converted by the CZML writer with a coma instead of a dot... I fixed those values with a regexp and my shapes were printed but in 2D...

Anyway thank you for your help, I will go with the kml branch for now. If you have any clue on how to improve the performance let me know please!

5

Hi,

I come back to you because I am having major performances issues and I would like to know if you could give me some advices.

I am using the kml branch to import some heavy kml files which are a representation of complex geometric shapes. These shapes are made of many simples shapes put together (many small Quadrilaterals).
In my kml files quadrilaterals are described like this :

<Placemark>
  <styleUrl>#Altitude00500m</styleUrl>
  <Polygon>
    <altitudeMode>relativeToGround</altitudeMode>
    <outerBoundaryIs><LinearRing><coordinates>
    -4.020408,44.693878,8172.971518 -4.020408,44.816327,5552.911972 -3.897959,44.816327,11564.441047 -3.897959,44.693878,8071.783921
    </coordinates></LinearRing></outerBoundaryIs>
  </Polygon>
</Placemark>

and there are 2500 of this.
With 2500 it is loading fast enough but moves on the globe are not very fluid... and I have another file to load with 62k+ shapes and this one is not loading at all...
Would you think of a better way to load kml files or to write them better to represent such a shape?

Thank you,
Emmanuel