Curvature App: Simulation of Globe-Earth and Flat-Earth

For a full Description see Finding the curvature of the Earth.

  • Curve
  • Causeway
  • Soundly
  • TrnsmLine
  • Tensas
  • Grace
  • Chicago
  • Canigou
  • Bedford
  • Custom
  • Reset

Click a Button to Start a Demo. Click again to skip one step. Click the Animation to start/stop. See also Controls below.

  • Views
  • Objects 1
  • Objects 2
  • Refraction
  • Units
  • Save/Restore
  • <<
  • Play
  • >>
  • 0

Please read the paragraph on Refraction to get familiar with this panel.

Use this Formular to convert between different lengh units. You can Copy/Paste the results into input fields in the other Forms.

Get App State Get App Url Set App State Compact Clear

Use this panel to save a certain App state by Get App State and use Copy/Paste to save the state in an external text file. Use Copy/Paste to copy a saved state from an external text file into this panel and click Set App State to activate this state. You can change the Parameters in this panel and apply them by pressing the RETURN button on the keyboard.

Use Get App Url to get an URL containing the current App State. Click Set App State oder copy the URL into any browser address field to go to this page and display the current App State.

Perspective on a Globe
if you have trouble understanding how perspective works on a Globe.

Comparison of Globe and Flat-Earth Model Predictions with Reality
to see a side by side comparison of the model predictions with the corresponding real images.

Computed Values

(Click: Zoom)
ZoomImage-InformationsBerechnete Werte
(Click: Zoom)
ZoomImage-InformationsÜbersichtsplan zur Simulation

URL Parameters

The App can be called with URL some parameters to set a specific App State:

You can use the Save/Restore Panel with the Button Get App URL to get an URL from the current state of the App. Copy this URL into any Web-Form (e.g. YouTube comment) and by clicking the link this page is opened with the saved state from the URL.

  • To start a certain Demo with the URL, append
    &demo=DemoName to the page URL, where DemoName is the Name of some of the Demo Buttons above the App Dispalay.
  • To set a demo to a specific position, append
  • To run a demo from a specific position, append
  • To open a specific Panel, append
    &tab=TabName, where TabNam is View, Obj1, Obj2, Refr, Unit or SaveRest.
  • To load a Custom Demo, that is a Demo programmed by another autorized user, append
    &custon=CustomDemo, where CustomDemo is the name, the user gave to one of his Demos.
  • To speed up or slow down all animtion, append

Some parameters may be combined in one URL, eg, &custom=CustomDemo&demo=Custom&play=3&tab=Refr

Overlay an Image onto the Graphic

You can overlay an image onto the graphic to replicate a scene on the image. To do that, open the Save/Restore Tab and click on Get App State. Scroll down to the property OverlayImage and enter an url to an image on the web into the string as follows:

  "rFEarth": 10007543,
  "showTheodolite": false,
  "OverlayImage": "http:/www.server.com/images/myimage.jpg"

Click Set App State oder press Enter. The image will be overlayed to the graph and automatically resized to fit without distortion with a transparency of 0.5. You can change the transparancy by clicking on the image. The more left you click, the more transparent the image gets.

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Erzeugt Friday, February 09, 2018
von wabis
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Geändert Thursday, February 15, 2018
von wabis