The API is a classic JSON-based REST API.

Also check out the The Laelith Authentication.

An easy way for developers to test if the API works.

Get the list of all Cadastre elements (Lots, streets, etc.). See the Cadastre format for more information.

The Cadastre is a 5400×3900 meter map with the (0,0) point being somewhere at the top-left corner, and the y-axis looking down. 1.0 = 1 meter

Get the details of a specific Cadastre element. See the Lot format for more information.

Example: https://api.laelith.com/cadastre/12.5.3.0

Same as GET /cadastre/{id}, but using an alias instead of a numerical id.

Example: https://api.laelith.com/cadastre/laelith-gazette

Change the owner of a Cadastre element. Requires admin or cartographer access.

Payload: owner_id

The end-point returns the complete element details.

Change the owner of a Cadastre element. Requires admin or cartographer access.

Payload: Array of widgets data

The end-point returns the complete element details.

Return a 400×400 PNG file that contains the NFT image of a Cadastre element.

Return a 400×400 PNG file that shows a map image of a Cadastre element.

Return the graph of the streets, plazas and gardens network.

Return the Height Map. It is a simple table 1081 x 781 table of z values. So it provides a resolution of 5 meters (1080×780 for the 5400×3900 m map).

Don't forget that element [0,0] represents the top-left corner. Here is a simple map-to-height Typescript function using bilinear interpolation and that works even outside the bounds of the map:

    const ELEVATION_GRID_H = 1080; // Index goes from 0 to ELEVATION_GRID_H *included*
    const ELEVATION_GRID_V = 780;
 
    function getAltitude(heightMap: number[][], pt: Point): number {
            const u = Math.max(Math.min((pt.x / 5400.0 * ELEVATION_GRID_H), ELEVATION_GRID_H), 0);
            const v = Math.max(Math.min((pt.y / 3900.0 * ELEVATION_GRID_V), ELEVATION_GRID_V), 0);
            const u_i = Math.floor(u);
            const u_f = u - u_i;
            const v_i = Math.floor(v);
            const v_f = v - v_i;
 
            let z = heightMap[u_i][v_i] * (1 - u_f) * (1 - v_f);
            if (u_f != 0 && u_i < ELEVATION_GRID_H) {
                z += heightMap[u_i + 1][v_i] * u_f * (1 - v_f);
            }
            if (v_f != 0 && v_i < ELEVATION_GRID_V) {
                z += heightMap[u_i][v_i + 1] * (1 - u_f) * v_f;
            }
            if (u_f != 0 && v_f != 0 && u_i < ELEVATION_GRID_H && v_i < ELEVATION_GRID_V) {
                z += heightMap[u_i + 1][v_i + 1] * u_f * v_f;
            }
 
            return z;
    }

Altitude 0 is the lake. Values go from about -750 m to +1300 m.

Recompute from scratch the entire cadastre for ALL elements and build the Cadastre file. Very slow

Recompute the cache of a single Cadastre element. This also updates the Cadastre file, but in a fast manner.

Same as GET /cache/{id}, but using an alias instead of a numerical id.

Example: https://api.laelith.com/cache/laelith-gazette

Build the Cadastre file by assembling all the cached elements. Reasonnably fast.

Get public information about a user account and his/her current Character (aka PC), if any.

Example: https://api.laelith.com/user/1

Get details about a character. Result includes the id of the user the character belongs to.

Example: https://api.laelith.com/character/1

Get the list of Cadastre elements that belong to a character.

Example: https://api.laelith.com/character/1/lots

Get a hierarchy representation of the Ontology. For more information, see lael3ndx_ontology.

Get an English and French translation table of the Ontology.