CN104820721A - Method for broadcasting traffic emergency accidents based on landmarks and mileages - Google Patents
Method for broadcasting traffic emergency accidents based on landmarks and mileages Download PDFInfo
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Abstract
The invention relates to the technical field of map data processing, and provides a method for broadcasting traffic emergency accidents based on landmarks and mileages, and comprises 1 landmark data indexes which comprise mileage information fields are built; 2 road data indexes are built; and 3 traffic emergency accident information is converted and is broadcast to users. The method for broadcasting traffic emergency accidents based on landmarks and mileages rapidly and effectively converts latitude and longitude data of places happening traffic accidents into traffic information which is attached with mileages based on actual roads on the basis of building road and landmark indexes, enables users to more intuitively know the places which have traffic emergency accidents to happen, improves quality of road condition information service, and enables the users to be capable of more effectively evading heavy-traffic roads.
Description
Technical field
The present invention relates to technical field of map data processing, be specifically related to a kind of emergent traffic incident broadcasting method based on terrestrial reference and mileage.
Background technology
Emergent traffic incident has larger impact to road conditions, and road conditions can be caused to be blocked up from unimpeded becoming in a short period of time.Meanwhile, real-time road application system advocates the participation that user provides traffic information, on-the-spot in certain emergent traffic incident, when user is unfamiliar with peripheral path environment, when can only report the latitude and longitude information that traffic events place occurs to intelligent transportation center, how to transform reporting of user information in time, the place that emergent traffic incident occurs is reported to other users effectively, other users are enable to evade emergent traffic incident place exactly, avoid the generation of blocking up more greatly, to raising trip quality, there is very strong practical significance.
Significant in geographical space, the easy significant key element distinguished from multiple directions and remember is called terrestrial reference, the relative position of one or several terrestrial reference that the expression of positional information can close on by referring to it realizes, and the location expression information further adding mileage can make user have the place that accident occurs to be familiar with more clearly.
Summary of the invention
Solve the problems of the technologies described above, the invention provides a kind of emergent traffic incident broadcasting method based on terrestrial reference and mileage, on the basis setting up road and terrestrial reference index, fast and effeciently the longitude and latitude data that traffic accident site occurs are converted to based on real road, attach the transport information of mileage, make user more directly perceived to the understanding of emergent traffic incident scene, improve the quality of traffic information service, enable user more effectively evade congested link.
In order to achieve the above object, the technical solution adopted in the present invention is, a kind of emergent traffic incident broadcasting method based on terrestrial reference and mileage, comprises the following steps:
(1) the landmark data index comprising mileage information field is set up,
1. from POI data, extract relevant POI alternatively mark,
2. calculate the projector distance of alternative terrestrial reference and all roads, the minimum value chosen in projector distance is designated as d
minprojif, d
minproj< threshold value, be then selected into this alternative terrestrial reference in the terrestrial reference set of corresponding road;
3. the mileage between this projection road starting point corresponding to this being alternatively marked on corresponding road is calculated;
4. set up terrestrial reference index structure, this terrestrial reference index structure comprises terrestrial reference call number and landmark data item, and each terrestrial reference call number is used for this landmark data item of index, to sort from small to large storage in described terrestrial reference index structure according to terrestrial reference call number;
(2) road data index is set up
Set up path search index structure, comprise path search index item and road data item, path search index item is for retrieving road data item, road RID in path search index item is according to storage of sorting from small to large, in road data item, the terrestrial reference call number in terrestrial reference call number set contained by every bar road to sort storage from small to large by the numerical value of mileage field in terrestrial reference.
(3) transform generation emergent traffic incident information, report to user
1. after determining the road RID at latitude and longitude coordinates place, emergent traffic incident place that user uploads, according to road data index file, parameter field belonging to particular link RID is obtained by binary search,
2. calculate and emergent traffic incident place occur to the mileage of this road starting point, be designated as L1,
3. terrestrial reference call number set contained by this road, according to terrestrial reference index data file, obtained the terrestrial reference of particular link ID by binary search, the attribute field data that each terrestrial reference is corresponding can be obtained thus, comprise byte length, landmark names shared by mileage, landmark names.
4. calculate the distance between the projection of each terrestrial reference and emergent traffic incident place in terrestrial reference set, be designated as | Li-L1|, compare and obtain the terrestrial reference nearest with this emergent traffic incident scene, if the mileage that this terrestrial reference projects to this road starting point is designated as L,
5. basis | L-L1| combines early warning information and reports to user.
Further, alternatively relevant described in target POI field comprises outlet at a high speed, Entry to motorway, outlet fast, prompt access, viaduct, bridge spanning the river, tunnel, mountain range, mansion, community, service area, charge station, parking lot, refuelling station/gas station, paying trade company (type is not limit).
Further, terrestrial reference m index entry is included in mileage between road starting point described in reference position, terrestrial reference in landmark data item to terrestrial reference projection and landmark names byte length, and landmark data item comprises terrestrial reference m title.
Further, path search index item is regular length, path search index item comprises road RIDn, road RIDn title byte number, road RIDn point set number, terrestrial reference number contained by road RIDn length and road RIDn, n is positive integer, road RIDn in path search index item is according to storage of sorting from small to large, described road data item is indefinite length, described road data item comprises road RIDn title, terrestrial reference call number set contained by road RIDn point set longitude and latitude and road RIDn, terrestrial reference call number set contained by described road RIDn to be sorted storage from big to small by the numerical value of mileage field in terrestrial reference.
The present invention is by adopting technique scheme, and compared with prior art, tool has the following advantages:
The present invention is by the basis setting up road and terrestrial reference index, fast and effeciently the longitude and latitude data that traffic accident site occurs are converted to based on real road, attach the transport information of mileage, make the understanding of user to emergent traffic incident scene more directly perceived, improve the quality of traffic information service, enable user more effectively evade congested link.
Accompanying drawing explanation
Fig. 1 is the concrete utilization example schematic of embodiments of the invention.
Embodiment
Now the present invention is further described with embodiment by reference to the accompanying drawings.
As a specific embodiment, a kind of emergent traffic incident broadcasting method based on terrestrial reference and mileage of the present invention, comprises the following steps:
(1) the landmark data index comprising mileage information field is set up
1. extract from POI data and alternatively mark with the POI of Types Below: outlet at a high speed, Entry to motorway, outlet fast, prompt access, viaduct, bridge spanning the river, tunnel, mountain range, mansion, community, service area, charge station, parking lot, refuelling station/gas station, paying trade company (type is not limit).
2. calculate minimum projection's distance of alternative terrestrial reference and all roads, the minimum value chosen in projector distance is designated as d
minprojif minimum projection's distance meets threshold condition, i.e. d
minproj< 30 meters, be then selected into alternative terrestrial reference in the terrestrial reference set of corresponding road, and this alternative terrestrial reference is d with the projector distance of corresponding road
minproj;
3. calculate this and be alternatively marked on the projection on corresponding road and the mileage between this road starting point;
4. set up terrestrial reference index structure, this terrestrial reference index structure comprises terrestrial reference call number and landmark data item, and each terrestrial reference call number is used for this landmark data item of index, to sort from small to large storage in described terrestrial reference index structure according to terrestrial reference call number;
Terrestrial reference 1 index entry comprises: road starting point belonging to the reference position of terrestrial reference 1 in landmark data item, terrestrial reference to terrestrial reference projection between mileage and landmark names shared by byte length,
Terrestrial reference m index entry comprises: the mileage between terrestrial reference m road starting point described in reference position, terrestrial reference in landmark data item projects to terrestrial reference and landmark names byte length, landmark data item comprises terrestrial reference m title.
Each terrestrial reference has unique terrestrial reference call number to identify, and by the terrestrial reference call number in " contained by road RIDn the set of terrestrial reference call number " in road data item, sets up the corresponding relation between terrestrial reference and road RIDn.
Path search index item is regular length, path search index item comprises road RIDn, road RIDn title byte number, road RIDn point set number, terrestrial reference number contained by road RIDn length and road RIDn, n is positive integer, road RIDn in path search index item is according to storage of sorting from small to large, described road data item is indefinite length, described road data item comprises road RIDn title, terrestrial reference call number set contained by road RIDn point set longitude and latitude and road RIDn, terrestrial reference call number set contained by described road RIDn to be sorted storage from big to small by the numerical value of mileage field in terrestrial reference.
In the present embodiment, " shared by landmark names byte length " field can store by 1 of a fixed length byte when Computer Storage, in a computer, and the numeric representation scope of 1 byte: 0 ~ 255.
In the present embodiment, just only have landmark names in landmark data item, fixed-length data and random length data are separately stored, and are the needs in order to apply binary search below.
1. terrestrial reference number (taking 1 byte)=10 bytes contained by fixed length=road RIDn (taking 4 bytes)+road RIDn title byte number (taking 1 byte)+road RIDn point set number (taking 2 bytes)+road RIDn length (taking 2 bytes)+road RIDn are fixed
2. path search index item is used for according to road RIDn numerical value, retrieval road data item, and terrestrial reference call number is not contacted directly.
3. indefinite length does not have length range, stores shared byte number and is determined by the concrete condition of road.
(2) road data index is set up
Set up path search index structure, comprise path search index item and road data item, path search index item is for retrieving road data item, road RID in path search index item is according to storage of sorting from small to large, in road data item, the terrestrial reference call number in terrestrial reference call number set contained by every bar road to sort storage from small to large by the numerical value of mileage field in terrestrial reference.
(3) transform generation emergent traffic incident information, report to user
1. after determining the road RID at latitude and longitude coordinates place, emergent traffic incident place that user uploads, according to road data index file, parameter field belonging to particular link RID is obtained by binary search,
2. calculate and emergent traffic incident place occur to the mileage of this road starting point, be designated as L1,
3. terrestrial reference call number set contained by this road, according to terrestrial reference index data file, obtained the terrestrial reference of particular link ID by binary search, the attribute field data that each terrestrial reference is corresponding can be obtained thus, comprise byte length, landmark names shared by mileage, landmark names.
4. calculate the distance between the projection of each terrestrial reference and emergent traffic incident place in terrestrial reference set, be designated as | Li-L1|, compare and obtain the terrestrial reference nearest with this emergent traffic incident scene, if the mileage that this terrestrial reference projects to this road starting point is designated as L,
5. basis | L-L1| combines early warning information and reports to user, and this early warning information is: " on XXX (road name), distance YYY (landmark names) |, there is traffic hazard, please evade in L-L1| km ".
In order to the technical scheme of the embodiment of the present invention is better described, shown in figure 1, list the schematic diagram of approach application in instantiation that utilizes the present embodiment, Fig. 1 is practice schematic diagram of the present invention,
As shown in Figure 1, suppose that the traffic hazard point of reporting of user has judged on road RID2, road direction such as arrow indicates.
(1) the landmark data index comprising mileage information field is set up
(2) road data index is set up
(3) transform generation emergent traffic incident information, report to user
1. the road determining the latitude and longitude coordinates place, emergent traffic incident place that user uploads is RID2, according to road data index file, obtains parameter field belonging to road RID2 by binary search.
2. calculate and emergent traffic incident place occurs to the mileage of road RID2 starting point, be designated as L1.
3. terrestrial reference call number set contained by RID2, according to terrestrial reference index data file, obtains corresponding terrestrial reference by binary search, can obtain the attribute field data that each terrestrial reference is corresponding thus, as mileage etc.
4. the distance between the projection of each terrestrial reference and emergent traffic incident place in terrestrial reference set is calculated, be designated as | Li-L1|, more known, the ground nearest with emergent traffic incident scene is designated as in " teahouse, Wuyi ", if the mileage projecting to this road starting point of terrestrial reference " teahouse, Wuyi " is designated as L.
5. combining following information reports to user: " on democracy road, distance teahouse, Wuyi |, there is traffic hazard, please evade in L-L1| km ".
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; can make a variety of changes the present invention in the form and details, be protection scope of the present invention.
Claims (4)
1., based on an emergent traffic incident broadcasting method for terrestrial reference and mileage, it is characterized in that: comprise the following steps:
(1) the landmark data index comprising mileage information field is set up,
1. from POI data, extract relevant POI alternatively mark,
2. calculate the projector distance of alternative terrestrial reference and all roads, the minimum value chosen in projector distance is designated as d
minprojif, d
minproj< threshold value, be then selected into this alternative terrestrial reference in the terrestrial reference set of corresponding road;
3. the mileage between this projection road starting point corresponding to this being alternatively marked on corresponding road is calculated;
4. set up terrestrial reference index structure, this terrestrial reference index structure comprises terrestrial reference call number and landmark data item, and each terrestrial reference call number is used for this landmark data item of index, to sort from small to large storage in described terrestrial reference index structure according to terrestrial reference call number;
(2) road data index is set up
Set up path search index structure, comprise path search index item and road data item, path search index item is for retrieving road data item, road RID in path search index item is according to storage of sorting from small to large, in road data item, the terrestrial reference call number in terrestrial reference call number set contained by every bar road to sort storage from small to large by the numerical value of mileage field in terrestrial reference;
(3) transform generation emergent traffic incident information, report to user
1. after determining the road RID at latitude and longitude coordinates place, emergent traffic incident place that user uploads, according to road data index file, parameter field belonging to particular link RID is obtained by binary search,
2. calculate and emergent traffic incident place occur to the mileage of this road starting point, be designated as L1,
3. terrestrial reference call number set contained by this road, according to terrestrial reference index data file, obtained the terrestrial reference of particular link ID by binary search, the attribute field data that each terrestrial reference is corresponding can be obtained thus, comprise byte length, landmark names shared by mileage, landmark names;
4. calculate the distance between the projection of each terrestrial reference and emergent traffic incident place in terrestrial reference set, be designated as | Li-L1|, compare and obtain the terrestrial reference nearest with this emergent traffic incident scene, if the mileage that this terrestrial reference projects to this road starting point is designated as L,
5. basis | L-L1| combines early warning information and reports to user.
2. a kind of emergent traffic incident broadcasting method based on terrestrial reference and mileage according to claim 1, is characterized in that: alternatively relevant described in target POI field comprises outlet at a high speed, Entry to motorway, quick outlet, prompt access, viaduct, bridge spanning the river, tunnel, mountain range, mansion, community, service area, charge station, parking lot, refuelling station/gas station and/or paying trade company.
3. a kind of emergent traffic incident broadcasting method based on terrestrial reference and mileage according to claim 1, it is characterized in that: terrestrial reference m index entry is included in mileage between road starting point described in reference position, terrestrial reference in landmark data item to terrestrial reference projection and landmark names byte length, and landmark data item comprises terrestrial reference m title.
4. a kind of emergent traffic incident broadcasting method based on terrestrial reference and mileage according to claim 1, it is characterized in that: path search index item is regular length, path search index item comprises road RIDn, road RIDn title byte number, road RIDn point set number, terrestrial reference number contained by road RIDn length and road RIDn, n is positive integer, road RIDn in path search index item is according to storage of sorting from small to large, described road data item is indefinite length, described road data item comprises road RIDn title, terrestrial reference call number set contained by road RIDn point set longitude and latitude and road RIDn, terrestrial reference call number set contained by described road RIDn to be sorted storage from big to small by the numerical value of mileage field in terrestrial reference.
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