1. ABOUT THE DATASET -------------------- Title: Fail Fraction: ArcGIS Pro and QGIS tools to calculate the probability of roof collapse under tephra fall loading Creator(s): Sara Osman Organisation(s): University of Leeds Rights-holder(s):Copyright 2023 University of Leeds Publication Year:2023 Description: The Fail Fraction tools (for ArcGIS Pro and QGIS) allow GIS users to calculate the probability of roof collapse under tephra fall loading for different eruption scenarios based on buildings’ roof type and condition properties and typical failure loads. There are versions of the tool for coarse and fine tephra as experimental results show fine tephra can be stable at higher roof pitches and the user must select the one that is most appropriate for the scenario being considered. The output is a map that shows the tephra load as a fraction of the failure load (the Fail fraction, F) and for values of F ≥ 1 the roof is at high risk of collapse. Cite as: Osman, Sara (2023) Fail Fraction: ArcGIS Pro and QGIS tools to calculate the probability of roof collapse under tephra fall loading. University of Leeds. [Dataset] https://doi.org/10.5518/1458. Related publication: Osman S, Crummy J, Carver S, Thomas M (In preparation) From probabilistic tephra load modelling to vulnerability assessment: a GIS tool to identify buildings at risk of roof collapse, Natural Hazards. Contact: eesjo@leeds.ac.uk 2. TERMS OF USE --------------- cc_by_v4_0 3. PROJECT AND FUNDING INFORMATION ---------------------------------- Title: Assessing roof vulnerability to collapse from tephra fall loading, with relevance to Ascension Island Dates: 2019-2023 Funding organisation: Panorama DTP (NERC) and British Geological Survey University Funding Initiative Grant no.: NE/S007458/1 and S246 4. CONTENTS ----------- File listing 1. Fail_fraction_toolbox.atbx ArcGIS Pro toolbox 2. Fail_fraction.lyrx ArcGIS Pro layer file 3. Fail_fraction_fine.model3 QGIS model for fine tephra 4. Fail_fraction_coarse.model3 QGIS model for coarse tephra 5. Fail_fraction.qml QGIS layer settings file 6. Fail_fraction_GIS_tool_instructions.docx MS Word document giving instructions for formatting input data and using the tools