[Dataset] columbia/enhants (v. 2011-04-07)

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the initial version

@MISC{columbia-enhants-2011-04-07,
  author = {Maria Gorlatova and Michael Zapas and Enlin Xu and Matthias Bahlke and Ioannis (John) Kymissis and Gil Zussman},
  title = {{CRAWDAD} data set columbia/enhants (v. 2011-04-07)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/columbia/enhants},
  month = apr,  
  year = 2011
}
					

This dataset includes radiant light energy measurements from a study by Columbia
University's EnHANTs (Energy Harvesting Active Networked Tags) project.

To characterize indoor energy availability, since 2009 we have been conducting 
a light energy measurement study in office buildings in New York City. In this 
study we take longterm measurements of irradiance (I, in units W/cm^2) in 
several indoor locations, and also a set of shorter-term indoor/outdoor mobile 
device measurements.

For the measurements we use TAOS TSL230rd photometric sensors installed on 
LabJack U3 DAQ devices. These photometric sensors have a high dynamic range, 
allowing capturing of widely varying irradiance conditions. We verified the 
accuracy of the sensors with a NIST-traceable Newport 818-UV photodetector.

Long-term data was collected in static locations on campus of Columbia 
University. Shorter-term experiments were collected by mobile devices.

There are multi-day interruptions in data due to power interruptions and device 
malfunctions.

[Traceset] columbia/enhants/energy (v. 2011-04-07)

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the initial version.

@MISC{columbia-enhants-energy-2011-04-07,
  author = {Maria Gorlatova and Michael Zapas and Enlin Xu and Matthias Bahlke and Ioannis (John) Kymissis and Gil Zussman},
  title = {{CRAWDAD} trace set columbia/enhants/energy (v. 2011-04-07)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/columbia/enhants/energy},
  month = apr,  
  year = 2011
}
					

This traceset includes radiant light energy measurements collected from 2009
to 2010 in a study by Columbia University's EnHANTs project.

Since June 2009, we have been recording irradiance every 30 seconds in several 
different static locations using TAOS TSL230rd light-to-frequency converters 
installed on Lab-Jack U3 Data Acquisition boards. We also conducted several
short-term experiments where measurement was conducted by sensor devices as
they were moved around New York city.

There are multi-day interruptions in data due to power interruptions and device 
malfunctions.

[Trace] columbia/enhants/energy/stationary (v. 2011-04-07)

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the initial version

@MISC{columbia-enhants-energy-stationary-2011-04-07,
  author = {Maria Gorlatova and Michael Zapas and Enlin Xu and Matthias Bahlke and Ioannis (John) Kymissis and Gil Zussman},
  title = {{CRAWDAD} trace columbia/enhants/energy/stationary (v. 2011-04-07)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/columbia/enhants/energy/stationary},
  month = apr,  
  year = 2011
}
					

This trace consists of long-term irradiance measurements taken at 6 static 
locations on the campus of Columbia University.

Traces A-F were made in stationary setups indoors.

A. Students' office, South-facing, 6th floor above ground; measurement setup 
   located on a windowsill; shading is used at all times. Trace starts on
   August 14, 2009 and is provided here to September 13, 2009.

B. Students' office (same as setup A); setup on a bookshelf far from the 
   window, receiving direct sunlight for a short portion of a day.
   Trace starts on November 13, 2009, and is provided here up to
   November 23, 2010.

C. Departmental conference room, North-facing, with large windows and an 
   unobstructed view; setup located on a windowsill. Shading use varies 
   (corresponding to the needs and preferences of different affiliates using 
   the conference room). Trace starts on November 6, 2009, and is provided here
   up to September 13, 2010.

D. Students' office; corner window facing South and West; setup placed on a 
   windowsill, shading extensively used. Trace starts on November 5, 2009, and 
   is provided here up to September 29, 2010.

E. Students' office directly under the office of setup A; setup on a 
   windowsill, limited use of shading. This was a pilot measurement, done from 
   June 25, 2009 to October 11, 2009.

F. Students' office, East-facing; setup on a windowsill; office window often 
   kept partially opened (the setup often receives unattenuated reflected 
   outdoor light). Trace starts on February 16, 2010, and is provided here up to
   April 15, 2010.

* The first column is the number of seconds since the beginning of the 
  experiment.

* The second column is the measured irradiance. The measurements are in units 
  of microwatts per cm^2. In records where the measured irradiance is less than
  0.01, the file contains 'NaN' instead of the numeric value.

* The subsequent columns are the timestamp of the measurement, separated into: 
  year, month, day, hour, minute, second.

[Trace] columbia/enhants/energy/mobile (v. 2011-04-07)

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the initial version

@MISC{columbia-enhants-energy-mobile-2011-04-07,
  author = {Maria Gorlatova and Michael Zapas and Enlin Xu and Matthias Bahlke and Ioannis (John) Kymissis and Gil Zussman},
  title = {{CRAWDAD} trace columbia/enhants/energy/mobile (v. 2011-04-07)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/columbia/enhants/energy/mobile},
  month = apr,  
  year = 2011
}
					

This trace contains short-term irradiance measurements collected by moving 
sensor devices.

* Indoor + Outdoor Mobile Measurements: pedestrian walking around university 
  campus (indoor and outdoor environments) carrying a sensor. Measurements 
  date: April 05, 2010.

* New York City Nighttime Measurements: pedestrian walking in New York City 
  (Theater District and Times Square) at nighttime, with a sensor attached to a
  backpack. Measurements date: July 22, 2010.

* Car-based roadtrip (sensor attached to the dashboard).

* Commuting on public transit, sensor attached to a backpack, measurements 
  outdoors, indoors (office, subway, train).

* The first column is the number of seconds since the beginning of the 
  experiment.

* The second column is the measured irradiance. The measurements are in units 
  of microwatts per cm^2. In records where the measured irradiance is less than
  0.01, the file contains 'NaN' instead of the numeric value.

* The subsequent columns are the timestamp of the measurement, separated into: 
  year, month, day, hour, minute, second.

[Author] Maria Gorlatova

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[Author] Michael Zapas

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[Author] Enlin Xu

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[Author] Matthias Bahlke

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[Author] Ioannis (John) Kymissis

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[Author] Gil Zussman

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[Paper] gorlatova-networking

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