The “SPectrogram Analysis and Cataloguing Environment” (SPACE) labelling tool

The SPectrogram Analysis and Cataloguing Environment (SPACE) tool is an interactive python designed to label radio emission features of interest in a time-frequency map (called “dynamic spectrum”). program uses Matplotlib’s Polygon Selector widget allow user select edit undefined number vertices on top the dynamic spectrum before closing shape (polygon). Multiple polygons may be drawn any spectrum, feature name along with coordinates for each polygon vertex are saved into “.json” file as per “Time-Frequency Catalogue” (TFCat) format other data such id, observer name, units. This paper describes first official stable release (version 2.0) tool.