OR/16/052 Specification of client supplied spatial data
| Kessler, H, Terrington, R, Wood, B, Ford, J, Myers, T, Thorpe, S, and Burke, H. 2016. Specification of in- and output data formats and deliverables for commissioned 3D geological models. British Geological Survey Internal Report, OR/16/052. |
Spatial referencing of data: ‘All spatial data supplied by the client to BGS should be spatially referenced in British National Grid and Ordnance Datum (6 figure grid references for point data). Spatial data using alternative reference systems may be acceptable subject to agreement by BGS and provision of all necessary transformation parameters by the client.’
Project extent(s): ‘A definite project outline must be supplied either as a polygon (ESRI shape file or Google .kml format) or if rectangular as x,y min max in British National Grid.’
Depth of investigation: ‘The project might focus on a particular stratigraphic unit, or require a full model to a certain depth in which case is vital that the depth of the project is agreed with the client.’
Digital Terrain model: ‘The default Digital Terrain Model (DTM) (land surface) to be used is the OS Open Data Landform Profile DTM (50 m cell-size). Any client-supplied elevation models should be provided as ASCII grids, meshed TINs or XYZs.’ Where appropriate, consider the availability/suitability of higher-resolution data, e.g.: ‘EA open data LIDAR DTM (2 m cell-size) should be offered as an option for more detailed (site-scale) models where appropriate.’
Borehole data: ‘Client-supplied borehole data is preferred in AGS V4 format, minimum requirement is digital data in spreadsheet or text format. If only in PDF or image format, additional time needs to be charged for manual input including interpretation and databasing.’
Image format spatial data: ‘Client-supplied images should be supplied as png, jpeg or TIF with world geo-registration file (referenced to British National Grid). If images are not geo-registered then sufficient information must be provided to allow their registration; additional time needs to be charged for manual registration.’