enochbayode / gog-animated

layer for OpenLayers

OpenLayers wind layers

Goal

Provide:

• a smooth particules layer animating the movement of the wind;
• an arrow layer displaying wind force and direction;
• a gradient layer displaying wind force;

Particles are kept while panning and zooming, contributing to a nice user experience.

It is compatible with OpenLayers 5 and probably OpenLayers 4.

Demo

See https://gberaudo.github.io/olwind

Blog post

See https://github.com/gberaudo/olwind/blob/master/blog.md

Local dev

git clone https://github.com/gberaudo/olwind.git
cd olwind
npm install
npm start

Limitations / Contribution ideas

• handling map rotation
  • arrows are shifted (OpenLayers bug?);
  • custom layers dimensions is fix;
• handling soft-zoom
  • when the browser uses softzoom (ctrl + wheel on a DOM element) the WebGL layer is shifted;
• particle speed changes with resolution, it should be fixed (in pixels / frame);
• WebGL gradient should use a nicer looking gradient (see OL heatmap);

If you are interested in working on one of these items, create an issue or contact me so that we can discuss it.

Other interesting projects

• https://github.com/sakitam-fdd/wind-layer

Custom dataset

If you want to use your own data, you need to provide 3 files:

• metadata.json

{
  "extent":[576551.1954449099,5667450.411567883,1300927.6096102786,6160637.315193227],
  "width":233,
  "height":347
}

Where:

• extent: the geographical extent of the dataset;

• width: the number of columns of the dataset;

• height: the number of rows of the dataset;

• u.bin et v.bin the horizontal and vertical speeds as a 32 bit array of floating points. the indices in these files map to the following layout:

  9, 10, 11, 12
  5,  6,  7,  8
  1,  2,  3,  4
  

Licenses

The project is dual licensed:

• BSD-2 clause for its ease of use and reuse;
• GPL-3 as a tribute to Richard Stallman's incredible work for liberty.