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Three-dimensional photo-reconstruction (PR) techniques have been successfully used toproduce high-resolution surface models for different applications and overdifferent spatial scales. However, innovative approaches are required toovercome some limitations that this technique may present for field imageacquisition in challenging scene geometries. Here, we evaluate SF3M, a newgraphical user interface for implementing a complete PR workflow based onfreely available software (including external calls to VisualSFM andCloudCompare), in combination with a low-cost survey design for thereconstruction of a several-hundred-metres-long gully network. SF3M provideda semi-automated workflow for 3-D reconstruction requiring ~ 49 h (ofwhich only 17 % required operator assistance) for obtaining a final gullynetwork model of > 17 million points over a gully plan area of4230 m<sup>2</sup>. We show that a walking itinerary along the gully perimeter usingtwo lightweight automatic cameras (1 s time-lapse mode) and a 6 m long poleis an efficient method for 3-D monitoring of gullies, at a low cost(~ EUR 1000 budget for the field equipment) and the time requirements(~ 90 min for image collection). A mean error of 6.9 cm at the groundcontrol points was found, mainly due to model deformations derived from thelinear geometry of the gully and residual errors in camera calibration. Thestraightforward image collection and processing approach can be of greatbenefit for non-expert users working on gully erosion assessment

SF3M software: 3-D photo-reconstruction for non-expert users and its application to a gully network