gps导航论文
already kept a view, simple operation step.
2.3 contents of the electronics map designs
The design of the electronics map includes the system design and the technique design two greatly part of. The system design is the foundation of the electronics map design, is the design of the electronics map existence environment. The main contents includes the data process design, software design, hardware of the electronics map to install valuation etc. of design and system.
The technique design is the key of the electronics map design. The main contents has the overall design, mathematics foundation design, the contents design, sign design, data of the electronics map to save the management design, manifestation technique design, and the sketch picture handle to design and calculate way etc..
T The contents design that mainly aims at the electronics map here carries on analysis. The contents design is an establishment in a kind of design of the use and the environment foundation: The map is reflection some one region objective environment. Therefore graphics have to know object deeply. Then can reflect object better The district range of research involves a various problem of the politics ,military, economy and natural environment, the data use is extensive very, design want to make sure to mean which contents, mean to what detailed degree. For example want to mean highway, can is divided into highway according to environment characteristics in district and the map use the superhighway, National Freeway, the province way and County Road etc..
3 The electronics map means a contents
The capacity of the map is limited, impossible mean all objects and phenomenon of the ground all, how build up unify to a great deal of data and the data of concept model, the completion is a to need the problem that the point resolve to the valid and reasonable reflection of the electronics map contents.
The traditional paper lies the quality diagram, data of saving mean to merge into an integral whole with data, the map contents is the fusion of the multi-layer sketch in the demonstration of the paper noodles, is various customer to need a contents of and gather, so the map design the personnel have to raise the map diagram noodles to carry negative quantity as far as possible. For the electronics map but speech, carry the negative quantity isn't a key problem, can see a concrete circumstance to carry on the manifestation exportation with the methods, such as classification, ratings and layering...etc. The electronics map means the contents really settles to mainly be decided by its use, data and the data circumstance and geography environment characteristics etc.
3.1 The classification of the electronics map main factor
The electronics map main factor the entity that have mutually congeniality gather and its numerical sketch mean. Will mutually the entity of the congeniality induce together. The numerical form and screen sketch form that counteract an assurance add in token of, be called electronics map main factor. For example will have a railroad, highway, big car road, bridge .etc. of go through the function to gather to call it as the road of the electronics map to want to search.
The classification of the electronics map main factor. The property and use that usually is the thing or phenomenon that press objective world carry on divide the line of, and have already become standard, this main body is the map diagram type and norm of various scale now in. The electronics map and numerical map have to accept up the under of near concern, therefore, the main factor of the electronics map classification should and the main factor of the numerical map classification consistent.
The electronics map main factor makes use of its tribute information, several information, to rush toward the information and the assistance information to carry on a description, these information use data as to carry a body. The attribute information is the information that describes the electronics map to want the search classification ratings and the quality quantity characteristic; Several information foot electronics map main factor space positions with several the information of the sketch; rushing toward an information is description with the crunodes, the segment and the noodles area represent of the map main factor abutment, connection, include etc. the information of relation; Lend support to the information means in addition to the attribute information, several information ,and rush toward an information of. The information of the basis effective demand, for example the color, ash degree, the line type flicker, elucidation etc..
3.2 The assurance of the electronics map contents
The electronics map the contents that need to be mean mainly includes a few aspects as follows:
3.2.1 The reflection of the objective world
The objective realistic world includes the natural geography main factor and social economic main factor.
The natural geography main factor includes ocean, the land water to fasten, the geography and land plant a quilt etc. The ocean main factor that the electronics map means up, mainly include the coast and the bottom of sea geography, sometimes also mean the ocean current, current, the bottom of sea bottom quality and ice boundary, sail marking at the sea etc., the land water fastens to include the river, take, reservoir and garden pond and order the form water to fasten sign, water to fasten the adjunct and water to fasten to note to record mainly etc. The soil quality with plant a quilt is the object that a kind of noodles form distribute, in common usably type the boundary, the elucidation sign, dead color and elucidation note to record to match each other to match to mean. The request of the geography that the map means up mainly has an appearance characteristic of reflect the geography, meaning a different type of geography and distributing a characteristics, have can measurement, display stereoscopic feeling etc. in ground, usually adopt a contour line in maps method, layering to establish a dizzy method of the color method and geography to mean
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