Scholarly Metrics measure the impact/influence of academic work:
You can track citations through various venues such as:
H index is calculated according to the number of papers published and cited. It measures productivity and influence of a researcher.
H index = x , whereby x is the number of publications with at least x number of citations.
Altmetrics measure the impact of the scholarly conversations in areas outside of the traditional publishing area/traditional metrics
Altmetrics are drawn from many different sources, such as:
Examples of altmetrics can be found on OneSearch via PlumX