The number of unique devices contributing tests in the tile. The average latency under load of all tests performed in the tile as measured during the upload phase of the test. This column is sparsely populated- some rows will have a null value as not all versions of Speedtest can perform this measurement. The average latency under load of all tests performed in the tile as measured during the download phase of the test. The average latency of all tests performed in the tile, represented in milliseconds The average upload speed of all tests performed in the tile, represented in kilobits per second. The average download speed of all tests performed in the tile, represented in kilobits per second. The geometry of each tile is represented in WGS 84 (EPSG:4326) in the tile field.Įach tile contains the following adjoining attributes: Field Name This equates to a tile that is approximately 610.8 meters by 610.8 meters at the equator (18 arcsecond blocks). As such, tile size varies slightly depending on latitude, but tile sizes can be estimated in meters.įor the purposes of these layers, a zoom level of 16 (z=16) is used for the tiling. By this definition, tile sizes are actually some fraction of the width/height of Earth according to Web Mercator projection (EPSG:3857). This tile-splitting continues as zoom level increases, causing tiles to become exponentially smaller as we zoom into a given region. At z=1, the tile is split in half vertically and horizontally, creating 4 tiles that cover the globe. At z=0, the size of a tile is the size of the whole world. The size of a data tile is defined as a function of "zoom level" (or "z"). In order to create a manageable dataset, we aggregate raw data into tiles. Hundreds of millions of measurements are taken on Ookla's Speedtest platform each month.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |