Annotation types


Below you will find a table with all the annotation answer types that are currently supported on Grand Challenge.

Answer type Description Stored as Caveats
Point single point 3D location of the point (json) -
Multiple points multiple points array of points (json) -
Distance measurement single line drawn on a single plane 3D locations of the start and end positions of the line (json) -
Multiple distance measurements multiple lines, each drawn on a single plane array of lines (json) -
2D Bounding Box rectangle drawn on a single plane 3D locations of the four corners of the rectangle (json) -
Multiple 2D Bounding Boxes multiple rectangles, each drawn on a single plane array of rectangles (json) -
Line line drawn on a single plane array of 3D locations of the seed points of the line (json) -
Multiple 2D Bounding Boxes multiple rectangles, each drawn on a single plane array of lines (json) -
Polygon shape drawn on a single plane array of 3D locations of the seed points of the polygon (json) size limitation, see below
Multiple polygons multiple shapes, each drawn on a single plane array of polygons (json) size limitation, see below
Mask multiple shapes, each drawn on a single plane mha file -

For (Multiple) polygons answer types, it is possible to create a large (number of) polygon(s) for a single question. This can lead to issues when saving these answers to Grand Challenge, as the answer becomes very big. You should consider using the Mask answer type if you expect a high number of polygons. With the option to switch between editors, you can utilize the polygon tool options and the mask tool options.

💡Use Mask answer type if you expect a high number of annotations for a single question or you if prefer your answer in image format

💡Use Polygon or Multiple polygons answer type if you don't expect a high number of annotations for a single question and you prefer the answers in a json format