Joseph K. Lee

• Research Associate at moovel Lab

We developed “Meteobike”, a light and low-cost urban traverse system based on the Raspberry-Pi. It can be assembled and programmed in undergraduate classes. The system can be mounted on bicycles to record geotagged air temperatures and humidity as one moves through cities and adjacent rural areas. In summer 2018, we used 25 systems to map and analy...

A method for directly measuring carbon dioxide (CO2) emissions using a mobile sensor network in cities at fine spatial resolution was developed and tested. First, a compact, mobile system was built using an infrared gas analyzer combined with open-source hardware to control, georeference, and log measurements of CO2 mixing ratios on vehicles (car,...

A method for directly measuring carbon dioxide (CO2) emissions using a mobile sensor network in cities at fine spatial resolution was developed and tested. First, a compact, mobile system was built using an infrared gas analyzer combined with open-source hardware to control, georeference and log measurements of CO2 mixing ratios on vehicles (car, b...

Urban areas are expanding rapidly in tropical regions, with potential to alter ecosystem dynamics. In particular, exotic grasses and atmospheric nitrogen (N) deposition simultaneously affect urbanized landscapes, with unknown effects on properties like soil carbon (C) storage. We hypothesized that: (H1.) Soil nitrate (NO3 (-) ) is elevated nearer t...

Background/Question/Methods Tropical forests in and around urban centers face a suite of anthropogenic disturbances that may be muted or absent in more remote forests. For example, urban–proximate forests are likely to experience soil degradation, forest fragmentation, atmospheric nitrogen (N) deposition, and encroachment by non-native species. T...

Securing public transportation ridership is critical for developing a sustainable urban future. However, many modern and growing cities are facing declines in public transport usage. Existing systems for analyzing and identifying weaknesses in public transport connections face major limitations. In cities, origin-destination (OD) matrices--which me...

Many modern and growing cities are facing declines in public transport usage, with few efficient methods to explain why. In this article, we show that urban mobility patterns and transport mode choices can be derived from cellphone call detail records coupled with public transport data recorded from smart cards. Specifically, we present new data mi...

Background/Question/Methods The abandonment of degraded agricultural land in Puerto Rico has led to large-scale forest regeneration in the region; forest recovery occurring contemporaneously with significant urban growth. As a result of this landscape fragmentation from urbanization, patches of secondary forests now exist within a mosaic of urban...

Tropical forests in and around urban centers face a suite of anthropogenic disturbances that may be muted or absent in more remote forests. In particular, urban-proximate forests are likely to have elevated soil nitrogen (N) levels because of local N deposition. High background N availability common in humid tropical soils may result in soil carbon...