## 8 Conclusions and Outlook  
As shown here for a case study in Ireland, application of the PS-InSAR technique to Sentinel-1 data is a feasible basis for detecting and monitoring ground motions occurring over small scales in regions of temperate oceanic climate. Our results give an unprecedented overview of recent small-scale ground motions in Ireland, which we have detected in diverse environments representative of the Irish landscape. The detected ground motions derive from a range of local anthropogenic and/or natural factors, and most seem to involve compaction of unconsolidated materials with velocities along LOS ranging from 9 mm/year to \(-17\) mm/year. Most of these movements were previously undocumented. This study further illustrates that for the PS-InSAR approach, Sentinel-1 imagery provided improved results for the Irish landscape in comparison to older C-band satellites (e.g., ENVISAT). The improvement is largely in terms of point density and coverage. PS points obtained from older datasets are mainly located over large urban and bare rock areas. PS points obtained from Sentinel-1 imagery additionally delineate infrastructure (motorways and railways) and peatlands in rural areas, and so enable a more robust detection of movements affecting a wider range of surface features. Future work should consist of an improved estimation of atmospheric delay of the SAR signal, as well as an assessment of the accuracy of detected motions in Ireland through coeval ground-based surveying. Finally, given the coverage and accessibility of Sentinel-1 data, a scaling up of ground motion detection and monitoring with the PS-InSAR approach to a country-wide level in Ireland should be explored. Large-scale national InSAR surveys could also be a future goal in other regions of temperate oceanic climate. The following are available online at [[http://www.mdpi.com/2072-4292/11/3/348/s1](http://www.mdpi.com/2072-4292/11/3/348/s1)]([http://www.mdpi.com/2072-4292/11/3/348/s1](http://www.mdpi.com/2072-4292/11/3/348/s1)), Table S1: Sentinel-1A/B images used for AOI-1. Descending track n\({}^{\circ}\) 96. The perpendicular baseline is calculated in respect to the refence date (in bold); Table S2: Sentinel-1A/B images used for AOI-1. Ascending track n\({}^{\circ}\) 74. The perpendicular baseline is calculated in respect to the refence date (in bold); Table S3: ENVISAT images used for AOI-1. Descending track n\({}^{\circ}\) 352. The perpendicular baseline is calculated in respect to the refence date (in bold); Table S4: Sentinel-1A/B images used for AOI-2. Descending track n\({}^{\circ}\) 125. The perpendicular baseline is calculated in respect to the refence date (in bold); Table S5: Sentinel-1A/B images used for AOI-2. Ascending track n\({}^{\circ}\) 103. The perpendicular baseline is calculated in respect to the refence date (in bold); Table S6: ENVISAT images used for AOI-2. Descending track n\({}^{\circ}\) 37. The perpendicular baseline is calculated in respect to the refence date (in bold). Conceptualization, S.F. and E.P.H. ; Methodology, S.F. ; Validation, S.F. and E.P.H. ; Formal Analysis, S.F. ; Investigation, S.F. ; Resources, M.F; Writing-Original Draft Preparation, S.F. and E.P.H. ; Writing-Review & Editing, M.F. and M.S. ; Visualization, S.F. ; Supervision, E.P.H. ; Project Administration, E.P.H. ; Funding Acquisition, S.F. This research was co-funded by the Irish Research Council (IRC) and the Geological Survey Ireland (GSI) under an IRC Enterprise Partnership Scheme Post-doctoral Fellowship (Project ID: EPSPD/2017/104). This work derives from post-doctoral research carried out by [PERSON] at UCD School of Earth Sciences, University College Dublin, with [PERSON] as academic mentor. We thank [PERSON] (GSI) for her support as enterprise mentor and we acknowledge [PERSON] (GSI) and [PERSON] (TII) for project support, advice and discussion. We are grateful also to [PERSON] at Bluesky International for data provision.