Why is generalization used by cartographers?
Generalization of maps has become necessary due to automatic production of maps on the web, and the increased amount of detailed GIS data available. Generalization is important in GIS applications other than cartography because increased data detail requires more storage space, data entry time, and processing time.
Which tool on a map is used to measure the exact location of a place?
The most common type of graphic scale looks like a ruler. Also called a bar scale, it is simply a horizontal line marked off in miles, kilometers, or some other unit measuring distance. The verbal scale is a sentence that relates distance on the map to distance on Earth.
What is one type of projection a cartographer would use to create a map?
Mercator
One of the most famous map projections is the Mercator, created by a Flemish cartographer and geographer, Geradus Mercator in 1569. It became the standard map projection for nautical purposes because of its ability to represent lines of constant true direction.
What is an example of map generalization?
Generalisation can be first defined by means of graphical constraints and scale. On a map the information is represented by means of symbols. As an example a 6 m width road represented by a line of 0.6 mm on a map is enlarged 10 times at 1:100,000 and 100 times at 1:1,000,000!
What is the process of cartography used for?
The field is called “cartography.” Cartography has been defined by the International Cartographic Association as “the discipline dealing with the conception, production, dissemination and study of maps.” One useful conceptualisation of cartography is as a process that links map makers, map users, the environment mapped …
Why is generalization necessary in GIS?
Sometimes GIS data contains an excess of detail or spatial information than what is needed for the scale of the map being prepared. Generalization is the method used in GIS to reduce detail in data. Those using generalized data to calculate length, perimeter, or area will incur errors in the calculations.
Which instrument is used to measure distance and angle on the map?
3.1 How to use the graphometer. 1. A graphometer is a topographical instrument used to measure horizontal angles. It is made up of a circle graduated in 360° degrees.
What are some geographic tools?
GEOGRAPHY TOOLS: Geographers use all sorts of tools to help them investigate their questions. They commonly use maps, globes, atlases, aerial photographs, satellite photographs, information graphics, and a computer program called GIS. Read below to learn about different tools.
How do cartographers decide which projection to use?
The larger the area covered by a map, the greater the distortion. Depending on the map’s purpose, cartographers must decide what elements of accuracy are most important to preserve. This determines which projection to use. Equal area maps distort shape and direction but display the true relative sizes of all areas.
How do projections help cartographers?
In cartography, a map projection is a way to flatten a globe’s surface into a plane in order to make a map. This requires a systematic transformation of the latitudes and longitudes of locations from the surface of the globe into locations on a plane.
How are generalized maps used?
Like combinatorial maps, generalized maps are used as efficient data structure in image representation and processing, in geometrical modeling, they are related to simplicial set and to combinatorial topology, and this is a boundary representation model (B-rep or BREP), i.e. it represents object by its boundaries.
What is Generalisation GIS?
Generalization is the method used in GIS to reduce detail in data. Since detail about a geographic feature is simplified during generalization, generalized data is less spatially accurate. Those using generalized data to calculate length, perimeter, or area will incur errors in the calculations.
Which is the best tool for cartographers?
RADAR used by cartographers when visibility is reduced 8. relief map colors show the earth’s features 9. topographical map best tool to use to locate the boundaries between countries 10. Winkel Tripel projection reduces distortion of distance, direction, and area 2. GIS 4. GPS 5. Mercator projection 7. RADAR 10. Winkel Tripel
Which is a useful characterization of the cartographic process?
One useful conceptualization of cartography is as a process that links map makers, map users, the environment mapped, and the map itself. One characterization of this process is depicted in Figure 3.4 below.
How does a cartographer make a map more intelligible?
Cartographers also need to simplify the features on a map beyond the tasks of feature type selection and feature classification in order to make a map more intelligible. This includes choosing to delete, smooth, typify, and aggregate entities within feature types.
Why is map abstraction important to the cartographic process?
Even to achieve a screen-sized map of the world on your computer, map abstraction is fundamental to representing entities in a legible manner.
https://www.youtube.com/watch?v=-41B5NQcz0U