Node {{{s1-lg1}}} is the first sector of [https://wiki.cosmos-lab.org/wiki/Hardware/Nodes#LargeNode 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 [https://wiki.cosmos-lab.org/wiki/Hardware/antennas#Directionallargenodesector antenna] is pointed to the northeast overlooking Amsterdam Ave.

'''''Contributors''': Sabbir Hossain, Jared Moser, Irfan Tamim''

'''''Data''': [https://wiki.cosmos-lab.org/raw-attachment/wiki/Architecture/Deployment/Measurements/s1-lg1/rssi_coverage_map_s1-lg1.2.csv Available here (CSV)]''

==== Node photographs
 ||||||Figure 1: Photographs of {{{s1-lg1}}} ||
 || [[Image(s1-lg1_roof.jpg, 600px)]] || 
 || Looking down from Mudd building rooftop.  ||

==== Coverage
[https://wiki.cosmos-lab.org/wiki/Architecture/Deployment/Measurements Coverage measurements] were performed around the node area in July 2021 and Summer 2022. More than 700 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}}}. ||
 || [[Image(rssi_coverage_map_s1-lg1.2.png, height=400px)]] || [[Image(s1-lg1_antenna_coverage.png, height=400px)]] ||
 || (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. Coverage also ranges upto Riverside Drive along 120th street with around -85 dBm RSSI.

==== Future Work

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