- Geometric shape (Zucker, 1973; Krier, 1979; Moughtin, 1992)
- Function (Krier, 1979; Moughtin, 1992)
- Characters (Car, 1992)
- Degree ketertutupannya (Spreiregen, 1965)
Geometric form of urban open space is divided into two groups: square and street (Krier, 1979; Moughtin, 1992). Square is a form of urban open space that is static, such as squares, playing fields and city parks that usually are centered and inward looking. While the street is dynamic, linear oriented at both ends, such as roads, pedestrian paths and so on.
The basic square shape according to Krier, 1979, derived from basic geometric shapes are triangles, rectangles and circles. Modification of the form - the basic form is a concern with the technique of angled space, segment of the basic element, overlapping / merged, adding to and distortion.
Physical quality of urban open space is determined by the degree ketertutupannya / enclosurenya level (Moughtin, 1992). This degree of closure will affect the meaning of a place. Degree of closure is determined by the ratio of the height (H) around the building and the wide open spaces (D) of the open space. Quality enclosure according Spreiregen, 1965, namely:
- H: D < 45: full enclosure
- H: D <30: treshold enclosure
- H: D <18: keterlingkupan minimum enclosure
- H: D <14: loss of enclosure
