Levelling 1
What was the first vertical datum in the Czech Republic?
The Adriatic Vertical Datum
What is the approximate difference between the Adriatic Vertical Datum and the Baltic Vertical Datum?
Approximately 40 centimetres
What is the maximum distance between points in geometric levelling from a centre?
100 metres
Who were the first people to apply geodesy in practice?
What is the science of map creation called?
The cartography
Which vertical datum was chosen after Czechoslovakia joined the Warsaw Pact?
The Baltic Vertical Datum (Bpv)
What is the current fundamental point for the Czech Republic?
Lišov near České Budějovice
Where are levelling marks typically placed?
Into the side of suitable objects or levelling stones
What is the oldest map of Bohemia?
Claudian's map, 1518
What are the three types of maps based on scale?
Small scale maps, medium scale maps, and large scale map
Where was the fundamental point of the Adriatic Vertical Datum located?
At the Molo Sartorio in Trieste
What are height points in levelling connected to?
They are connected to survey marks.
What are the three types of instruments used for height measurement?
Levelling instruments, compensator instruments and digital instruments
What are called the lines joining points of the same latitude?
The parallels
What iscalled the shape that the ocean surface would take under the influence of Earth's gravity if other influences were absent?
The geoid
What is a tide gauge used for?
For measuring the mean sea level
Where is the initial point of the Baltic Vertical Datum located?
o The initial point is in Kronstadt at the Baltic Sea.
In Kronstadt at the Baltic Sea
What are at least four components of a levelling instrument?
telescope, alidade, tilting screw, limb, spherical level, tripod, adjusting screw, spring plate, foot plate, and stand clamping bolt
Who created a highly accurate map of Moravia in the 17th century?
J. A. Komenský (Comenius)
On which map can we find the figure of Krakonoš?
Helwig's map of Silesia
During which years was the Adriatic Vertical Datum network built?
Between 1873 and 1896
What is surface levelling used for?
For measuring heights from one station, such as playgrounds, slopes, and fields
What is geometric levelling from a centre used for?
It is used to determine the height of a point.
What are called the longitude lines perpendicular to the Equator?
Meridians
What map used both scoop and tree-based methods?
Fabricius map of Moravia (1569)