Node {{{s2-lg1}}} is the second 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 55m above the campus level and 65m above the street level. Sector 2's [https://wiki.cosmos-lab.org/wiki/Hardware/antennas#Directionallargenodesector antenna] is pointed to the northwest overlooking the intersection of Broadway and 120th St, and Manhattanville, West Harlem.

'''''Contributors''': Gulnur Avci, Sienna Brent, Sabbir Hossain, Jared Moser, Manav Kohli''

'''''Data''': [https://wiki.cosmos-lab.org/raw-attachment/wiki/Architecture/Deployment/Measurements/s2-lg1/rssi_coverage_map_s2-lg1.csv Available here (CSV)]''

==== Node photographs
 ||||||Figure 1: Photographs of s2-lg1 ||
 || [[Image(s2-lg1_roof.jpg, 600px)]] || 
 || Looking down from Mudd building rooftop. s2-lg1 antenna on the far left.  ||

==== Coverage
[https://wiki.cosmos-lab.org/wiki/Hardware/Nodes/Measurements Coverage measurements] were performed around the campus area in June-August 2021. In total, 457 measurements were taken in the streets around the large node. The measurement results are presented below.

 |||||| Figure 2: Coverage measurement results for {{{s3-lg1}}}. ||
 || [[Image(rssi_coverage_map_s2-lg1.png, height=400px)]] || [[Image(s2-lg1_antenna_coverage.png, height=400px)]] ||
 || (a) Measurement results || (b) 60 degree 3dB antenna beamwidth displayed over measurement map ||

The measurements show -77 dBm RSSI at a link distance up to 550m distance away. The location with highest signal strength received was on 120th St in within the 3dB beam width of the antenna. These measurements demonstrate that s2-lg1 provides coverage to a significant portion of Broadway almost up to 125th St, along with streets between Broadway and Amsterdam Ave. Coverage also extends to Riverside Park and portions of Claremont Ave.