Metric Survey Framework

Description

English Heritage wishes to establish framework agreements for the range of metric survey services carried out on historic sites and monuments. The services under the framework agreements fall into the following categories: Lot 1. Image Based Survey including Photogrammetric cover of building fabric, elevations, ceilings and floors. Precise co-ordinate control by use of marked control targets and detail points. Photo cover and control commensurate with up to 1:20 scale photogrammetric plotting. 1.1 Plotted vector output by use of photogrammetric plotting techniques ; base data to be generated in 3D. 1.2 Orthophotographic output including provision of digital elevation model (DEM) data and overlaid or corrected digital images. Rectified photography: rectified photography and control package of building fabric, elevations, ceilings and floors with precise coordinate control, by use of marked control targets and detail points. 1.3 Generation of digital rectified photomontages. Lot 2: Low Level Aerial Photography: Split in to: 2a; From manually controlled platform 2b; Using Programmable flight control systems: minimum height 2 metres to maximum height 120 metres Lot 3. Topographic Survey of historic landscapes and sites at 1:500, 1:200 and 1:100 scales using terrestrial techniques. Lot 4. Measured Building Survey in the form of plans, sections, elevations and sectional elevations at 1:50 and 1:20 scales. Consultants are required to be conversant with all aspects of metric survey as described above as applied to historic buildings and landscapes, with specific understanding of the group or groups of services for which they wish to be considered. The contract period will be 3 years, commencing April 2015, with the option to extend for a further year by mutual agreement with the suppliers. The total overall expenditure on these services is estimated to be in the region of 100000 GPB per annum (please note that this figure is given for guidance only and cannot be guaranteed). Services under the frameworks will also be ordered by Historic Scotland. .