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OkMap – User manual
December 14, 2015
Glossary
A
Accuracy
Accuracy is the degree of precision in the positioning of lines and dots on paper. Many factors
affect the accuracy with which the geographical features can be drawn on a map: the scale,
the quality of the data source, the thickness of the lines adopted in the representation.
Actuality
is a measure of overall quality of a mapping which measures the percentage change between
the time of detection and the current date.
Address matching
literally address detection, is an alternative system for data geocoding. With some software
you can indeed build a system of reference that allows the identification of a point than
through classical coordinate systems (e.g. Latitude and longitude) but by indications of
addresses (street, house number, etc..) on, for instance, a road graph.
ADSL
ADSL stands means Asymmetric Digital Subscriber Line and is a technology that allows you
to convert analog phone line (the traditional twisted pair copper) in a high speed digital line
for an ultra-fast Internet access. ADSL is ideally suited to the way of browsing the Internet
and to the use of multimedia content, both characterized by a greater flow of data from the
network towards the user (downstream) and a smaller amount of data and control signals
sent by the user to the network (upstream), which is why it is called 'asymmetric'.
Aero photogrammetric restitution
procedure which allows, using special instruments (analogue or digital photo renderer), to
build a map (both on paper and digital) of a portion of land by stereoscopic aerial
photographs.
Algorithm
algorithm well-defined complex instructions or operational requirements that govern the
behavior of an operator (mechanical, electronic or human) to solve a problem. In a software
corresponds to a set of instructions to the computer.
Arc
linear element stored in vector format consists of a begin pair of coordinates (starting node),
a final pair of coordinates (end node) and a series of coordinate pairs such intermediate
vertices. Each arc has a direction and a length. By combining several arcs together by the
nodes it is possible to build some usable graphs, for example, for many types of analysis
(road, hydrographic, etc.).
Area compared
see buffer.
Attribute
descriptive information associated with a geographic object and that characterizes it.
Generally, in the GISs, indicates the features not graphics of the element or those that
cannot be represented in the scale of acquisition. For example, they might be attributes of a
linear element (arc) which represents a road: the type of pavement, the average number of
vehicles in transit, width, etc..
B
Backup
process by which you can save the entire patrimony of the data on media that ensure its
preservation over time.
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