Node s1-lg1 is the first sector of ​Large Node 1, located on the 18th floor roof of the Mudd Building at Columbia University, roughly 68m above the campus level and 78m above the street level. Sector 1's ​antenna is pointed to the northeast overlooking Amsterdam Ave.

Contributors: Sabbir Hossain, Jared Moser, Irfan Tamim

Data: ​Available here (CSV)

Node photographs

Figure 1: Photographs of s1-lg1

Looking down from Mudd building rooftop.

Coverage

​Coverage measurements were performed around the node area in July 2021 and Summer 2022. The measurements were taken along Amsterdam avenue, as well as the along 120th to 122nd street and the housing projects by 123rd street. The measurement results are presented below.

Figure 2: Coverage measurement results for s1-lg1.
(a) Measurement results	(b) 60 degree 3dB antenna beamwidth displayed over measurement map

The measurements show coverage upto half way between 129th and 130th street along Amsterdam avenue, receiving over -80 dBm RSSI. s1-lg1 is also able to cover upto Riverside Drive along 120th street with around -85 dBm RSSI.

Future Work

Further measurements along the sidewalks from 123rd to 129th street.