SNIP measures contextual citation impact by weighting citations based on the total number of citations in a subject field.
SJR is a prestige metric based on the idea that not all citations are the same. SJR uses a similar algorithm as the Google page rank; it provides a quantitative and a qualitative measure of the journal’s impact.
The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years.
© Thomson Reuters Journal Citation Reports 2015
To calculate the five year Impact Factor, citations are counted in 2014 to the previous five years and divided by the source items published in the previous five years.
© Journal Citation Reports 2015, Published by Thomson Reuters
Tunnelling and Underground Space Technology incorporating Trenchless Technology Research is an international journal which publishes authoritative articles encompassing original research and case studies on the development of tunnelling technology, the use of underground space and trenchless technology. The journal is committed to publishing papers on the interdisciplinary aspects of planning, creating, and regulating underground space, and covers a very wide scope of underground space and underground construction, including:
Geo-investigation, geomechanics analysis, design and modelling, construction and monitoring, and maintenance and rehabilitation of tunnels and large underground and earth-sheltered structures.
Planning, development, and operation of underground space and underground space environment such as architecture, safety and comfort, and human-space interaction.
Installation and rehabilitation of underground pipelines, ducts, and cables using pipe jacking, microtunnelling, and other forms of trenchless technologies.
All papers on the topics within the journal scope are welcomed. Papers can be in the form of original research papers or case study papers on underground space utilization and underground construction technology.