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 55m above the campus level and 65m 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''

'''''Data''': [https://wiki.cosmos-lab.org/raw-attachment/wiki/Architecture/Deployment/Measurements/s1-lg1/rssi_coverage_map_s1-lg1.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. In total, 97 measurements were taken along Amsterdam Ave. The measurement results are presented below.

 |||||| Figure 2: Coverage measurement results for {{{s1-lg1}}}. ||
 || [[Image(rssi_coverage_map_s1-lg1.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 above -65 dBm RSSI at a link distance over 600m distance away. These measurements demonstrate that s1-lg1 provides coverage to a significant portion of Amsterdam Ave even past 125th St.

==== Future Work

Further measurements on Amsterdam Ave. to cover more distance, as well as measurements on side streets.