Guide for labeling geospatial / simple tile data.
Feature | Import annotation | Export annotation |
---|---|---|
Bounding box | See payload | See payload |
Polygon | See payload | See payload |
Polyline | See payload | See payload |
Point | See payload | See payload |
Radio classification | See payload | See payload |
Checklist classification | See payload | See payload |
Free-form text classification | See payload | See payload |
minZoom
and maxZoom
parameters to specify the zoom level limits. The zoom parameter is an integer between 0 (zoomed out) and 18 (zoomed in). 18 is normally the maximum, but some tile servers may exceed that.
In order to use our tiled imagery editor, you must use a tile server to create your map tiles. When you import your map tiles, you can use bounds to specify the area of interest and to break up your map tiles into appropriate labeling tasks.
Tiled imagery supports the following coordinate reference systems (CRS):
CRS | Description |
---|---|
EPSG:3857 | A projected coordinate system measured in meters on a flattened surface. It is the projection of the EPSG:4326 coordinate system onto a square for viewing on a web app. Uses the Spherical Mercator projection (also known as the Web Mercator projection) to render within a web page. |
EPSG:4326 | A geographic coordinate system used by GPS to express locations on the earth using GeoJSON longitude and latitude. Also known as the World Geodetic System (WGS84). |
Simple | A basic geographic coordinate reference system that maps x to longitude and y to latitude. Also uses the Equirectangular or Plate Carrée projection to render within a web page. |