Surveying and Mapping Flashcards
Which OS map is the most accurate
OS MasterMap
What scales are the OS MasterMap Topography Layer design to be used at.
1:1250, 1:2500 and 1:10,000 scales in urban, rural and mountain/moorland areas
respectively.
What is absolute and relative accuracy in mapping.
Absolute is how near is a point on a map to its ‘real-world’ position.
Relative is how accurate are measurements done on the map i.e. between two points
What is the general accuracy for OS maps
This varies but OS maps are usually accurate to 1 meter.
What is the difference between raster maps and vector maps.
Raster is an image un-editable formed from pixels. Vector uses vector graphics with data relating to the location of each line and point that can be loaded into a CAD programme.
What is GIS
Geographic information systems are the modern equivalent of paper maps. Using software
many layers and scales of mapping can be stored and combined with other useful spatial
information.
What is a map
A graphic representation or scale model of spatial concepts. It is a means for conveying
geographic information.
What professional Standards are you aware of relating to mapping.
Use of GNSS in land
surveying and mapping
what is GNSS
Global navigation satellite system, equipment which links to other surveying equipment so that the information being gathered can be referenced to the relative position within the globe and cross referenced with other survey data such as OS or other topographical data.
Who regulates drone use in the UK
CAA Civil Aviation Authority
What are the new drone regulations
Introduced at the end of 2022 the new regulations align with EU regulations and no longer categorise flights into commercial and leisure. The new regulations now categorise flights according to potential risk of the flight. Factors
such as size, weight, speed and operating environment all contribute to the potential to cause
harm. Use of drones over 250g requires qualification of pilot and often operational
authorisation from the CAA.
