Data Lens Developer's Guide

Input Coordinate Types

Data Lens REST API query data includes rows with named columns. Each row can contain one or more pairs of coordinates in two coordinate systems:

  • Geographic coordinates are represented by latitude and longitude. This is a common way to describe location and normally does not require data preparation. In Data Lens, they are used to represent single points with a marker or primitive. Data in this format can be visualized with H.datalens.ObjectLayer.
  • Pixel coordinates are represented by px and py which represent a row and column within a tile. Pixel coordinates are used in Data Lens to aggregate points on the server-side. It improves rendering performance and decreases the size of transmitted data. Data in this format can be visualized with H.datalens.HeatmapLayer and H.datalens.RasterLayer.

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