Output JSON format

Labels in a 2D and a 3D project can be downloaded in a JSON file. Output JSON file consists of a labels array object, which has the following fields:
1.
file_id (string): refers to the ID of the image/frame to which the label belongs to.
2.
label_category_id (string): refers to the label category of the label.
3.
label_id (string): refers to the ID of the label.
4.
label_type (string): refers to the type of label created. It can have values of the following possible values with their corresponding description:
a. box: this is a 2D bounding box label
b. lane: this is a 2D lane label
c. polygon: this is a 2D polygon label
d. point: this is a 2D point label
e. scene: this is a 2D scene label
f. 3d_bbox: this is a 3D bounding box label
g. 3d_point: this is a 3D point label
h. 3d_polyline: this is a 3D polyline label
i. 3d_polygon: this is a 3D polygon label
j. scene: this is a 3D scene label
5.
stage_id(string): refers to the stage of the label 
6.
attributes_source: refers to if attributes are added manually or automatically.
7.
create_time_millis: refers to the time at which the label is created in milliseconds.
8.
label_set_id: help multiple users to label the same object using their label set the id.
9.
labeller_email: displays the labeller email.
10.
sensor_id: displays the sensor id. 
11.
update_time_millis: refers to the last updated time at which a label is updated in milliseconds.
12.
attributes (object): consists of the key-value pair for each label attribute.
13.
box (array): An array of 4 numbers representing a 2D bounding box. The first two numbers refer to the x, y coordinates of the top left corner. The third and fourth number in the array refers to the length of the bounding box along the x and y axes respectively. This field is populated only when the label type is a box.
14.
polygons (array): An array of polygons. Each polygon is an array of points. Each point is a 2-length array of x and y coordinates. This field is populated only when the label type is polygon or lane.
15.
point (array): consists of coordinates of the point. This field is populated only when the label type is the point.
16.
three_d_bbox (object): has the following fields:
a. l (float): refers to the length of a 3D bounding box
b. w (float): refers to the width of a 3D bounding box
c. h (float): depicts the height of the 3D bounding box
d. cx (float): refers to the x coordinate of the center of the 3D bounding box
e. cy (float): refers to the y coordinate of the center of the 3D bounding box
f. cz (float): refers to the z coordinate of the center of the 3D bounding box
g. rot_z (float): depicts the angle (in radians) made by the front face of the 3D bounding box with the negative x-axis measured in the clockwise direction.
h. quaternion: depicts the rotation angles of the box in quaternions.
This field is populated only when the label type is 3d_bbox.
17.
three_d_point_indices (array): consists of indices of LiDAR points in the point cloud file. This field is populated only when the label type is 3d_point.
18.
three_d_polygon (array): is an array of x, y and z coordinates of different points comprising the polygon. This field is populated only when the label type is 3d_polygon.
19.
three_d_polyline (object): has the following fields:
a. polyline (array): consists of x, y and z coordinate values of the points creating polyline.
b. polyline_width (float) : is the value of width of polyline.
This field is populated only when the label type is 3d_polyline.

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2D box pre-labeling model API

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