Frequently Asked Questions

Will data you supply be compatible with my computer system?

PDS specialise in the provision of measured survey data in digital format for use in CAD (Computer Aided Drafting) systems as used by the vast majority of architects, engineers and contractors in the UK. If you need data in a different format for your system, just ask!

What is a Topographic Survey?

Topographic Surveys are used to identify and map the contours of the ground and existing features on the surface of the earth or slightly above or below the earth's surface (i.e. trees, buildings, streets, walkways, manholes, utility poles, retaining walls, etc.).

Can you provide site areas and volumes?

Yes, we can provide accurate site areas which can aid when purchasing land. We can also accurately set out the areas if disputed or if land titles are divided. If you require the volume of material measured we can provide it, we undertake many stockpile surveys and have extensive experience on landfill sites.

What is included in a measured building survey?

The amount of detail included in a measured building survey depends on your requirements, and may vary for the purposes of design, planning or feasibility. The structural elements including walls, columns and beams, being the most important, are shown on the floor plans, elevations and sections. All features such as doors, windows, services fittings are then added with floor levels, heights and descriptive text to give a clear representation. Survey drawings are normally delivered as CAD files and as scaled paper plans.

How does GPS work?

GPS - Global Positioning System is a network of satellites system run by the U.S. government which constantly send out the time and their position, the difference in time when the signal is received multiplied by the speed of light gives the distance between the satellite and the receiver and the distance from 4 satellites enables a 3D position of the receiver to be calculated. Due to differences in atmospheric composition, errors in satellite position and clock errors the best accuracy achievable using this method alone is only 2-5m.


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