CN109974730A - A kind of point of interest terrestrial reference path guide method of spontaneous geography information - Google Patents
A kind of point of interest terrestrial reference path guide method of spontaneous geography information Download PDFInfo
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- CN109974730A CN109974730A CN201910195550.6A CN201910195550A CN109974730A CN 109974730 A CN109974730 A CN 109974730A CN 201910195550 A CN201910195550 A CN 201910195550A CN 109974730 A CN109974730 A CN 109974730A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 13
- 238000002203 pretreatment Methods 0.000 claims abstract description 4
- 230000010354 integration Effects 0.000 claims description 3
- 238000013077 scoring method Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims 1
- 230000019771 cognition Effects 0.000 abstract description 6
- 238000004364 calculation method Methods 0.000 description 4
- 238000013475 authorization Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000005252 bulbus oculi Anatomy 0.000 description 1
- 238000013506 data mapping Methods 0.000 description 1
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- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
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- VMXUWOKSQNHOCA-UKTHLTGXSA-N ranitidine Chemical compound [O-][N+](=O)\C=C(/NC)NCCSCC1=CC=C(CN(C)C)O1 VMXUWOKSQNHOCA-UKTHLTGXSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/34—Route searching; Route guidance
- G01C21/3453—Special cost functions, i.e. other than distance or default speed limit of road segments
- G01C21/3476—Special cost functions, i.e. other than distance or default speed limit of road segments using point of interest [POI] information, e.g. a route passing visible POIs
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Abstract
The invention discloses a kind of point of interest terrestrial reference path guide method of spontaneous geography information, it is related to surveying and drawing technical field of geographic information；Its path guide method are as follows: step 1 is registered the acquisition of data based on microblogging social platform VGI-POI；Step 2 obtains VGI-POI and registers the pretreatments of data；Step 3, VGI-POI register data validity calculate；Step 4, the selection of VGI-POI terrestrial reference Route guiding optimal path；Step 5, the VGI-POI terrestrial reference Route guiding based on optimal path；The present invention can go on a journey to people and provide Route guiding, generate the Route guiding description information for meeting people's spatial cognition habit, foundation and reference are provided for scientific Selecting Travel Paths, the limitation of conventional navigation method, POI and tradition POI terrestrial reference path guide method is overcome to a certain extent, help to reduce the pathfinding time, reduce psychological burden and improve navigation efficiency, and have Expenses Cost low, Route guiding meets people's spatial cognition habit, is convenient for the characteristics of actually using.
Description
Technical field
The invention belongs to survey and draw technical field of geographic information, the point of interest terrestrial reference path for being related to a kind of spontaneous geography information is drawn
Guiding method.
Background technique
Spontaneous geography information (Volunteered Geographic Information, VGI) is as a kind of novel big
Many geographic information data sources, it is intended to personal that geodata is voluntarily provided.
Point of interest (Point of Interest, POI) is the core content of numerical map, refers to that all can be abstracted
For the entity of point, urban infrastructure construction more especially relevant to people's life, can be a building, retail shop,
Bus station etc. can play a role in the services such as auxiliary positioning, position enquiring search, path query search, navigation.
The terrestrial reference of narrow sense refers to significant geographic object present in geographical space, and the terrestrial reference of narrow sense is contained in POI.
POI terrestrial reference is primarily referred to as in geographical space environment that cognition degree is higher, the Space Elements that should be readily appreciated that and remember, having in city
The POI of certain influence power can act as terrestrial reference.
Route guiding is referred to as navigating, and is the current path shape of real-time tracking user during path navigation
State guides user to next pilot point, so that constantly guidance user easily and quickly arrives at the destination.
Existing path guide method mainly includes following several method:
A kind of method is traditional air navigation aid.Most of this method using " steering-distance " Route guiding
Mode, the path of recommendation are all distance most short or time shortest paths, and shortest path first can be classified as by being substantially all.
Another method is the path guide method of POI.This method generally selects multiple POI as pilot point, on road
Path of navigation is constituted in diameter description with multiple POI.The acquisition of POI data is mostly acquired in a manner of surveying and drawing.
Still an alternative is that the path guide method of tradition POI terrestrial reference.This method chosen from POI be easy to remember and
Famous spatial object is constituted path of navigation on path description as terrestrial reference with multiple POI terrestrial references.The extraction master of POI terrestrial reference
It to be carried out by the on-the-spot record of multiple professional testing crews and the mode of memory and questionnaire.
It usually will not be fully according to most short since present people are when carrying out Path selection for traditional air navigation aid
Standard routes select, but are more likely to the route that selection meets people's spatial cognition habit, so existing conventional navigation
System is unable to satisfy the demand of people.
For the path guide method of POI, different POI is to the availability, efficiency and satisfaction of Route guiding not phases
Together, it to reduce distraction when people's pathfinding, needs to confirm effect of the POI based on user preference in Route guiding, leads to
Often need to establish a comprehensive mathematical model to evaluate its reasonability, it is more complicated, it is difficult to judge in a short time, Er Qiechuan
System POI data mapping mode, which acquires, needs to expend a large amount of professional and physical resources and financial resources.
For the path guide method of traditional POI terrestrial reference, since the time of consuming and human capital are too high, be not suitable for a large amount of
The extraction of POI terrestrial reference timely updates with geographical space.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of point of interest terrestrial reference roads of spontaneous geography information
Diameter bootstrap technique, i.e. VGI-POI terrestrial reference path guide method solve conventional navigation method and do not meet people's spatial cognition habit
Used, POI and the high technical problem of tradition POI terrestrial reference path guide method Expenses Cost, it is reasonable to realize Route guiding, convenient for reality
Border uses, and navigation efficiency improves, the technical effect that psychological burden reduces.
The technical scheme adopted by the invention is that:
Step 1 is registered the acquisition of data based on microblogging social platform VGI-POI.
Step 2 obtains VGI-POI and registers the pretreatments of data.
The VGI-POI obtained from microblogging social platform data of registering are pre-processed, including geographical cold spot and geography it is different
The pretreatment of structure point.
Handle the method that geographical cold spot is screened using frequency threshold value of registering is set:
LP={ VPi|Ni≤Nt, i=1,2 ..., n }
Wherein, LP indicates geographical cold spot, VPiIndicate that VGI-POI registers data, NiFor VPiCorresponding number of registering, NtFor
The frequency threshold value of registering of setting.
Geographical isomery point is handled using the method for merging isomery point, calculating isomery space of points similarity first is similar with attribute
Degree, then merges according to whether the threshold decision of setting belongs to same geo point:
MP=MD≥DtAnd MH≥Ht
Wherein, MP indicates the geographical isomery point that can merge, MDRepresentation space similarity, DtRepresentation space similarity threshold,
MHIndicate attributes similarity, HtIndicate attributes similarity threshold value.
Space similarity MDIt is measured using two-dimensional surface linear distance, the shorter space similarity of distance is higher.
Attributes similarity MHUsing same position with word and different word difference scoring methods, compare two isomery point title character strings it
Between similarity, score with position with word be to occurring counting with the number of word in two name character string same positions, it is different
It is that the number for including different words to two name character strings counts that word difference, which is scored, and two differences scored are bigger, attribute
Similarity is higher, and specific formula for calculation is as follows:
MH=R-T
Wherein, MHIndicate attributes similarity, R expression is scored with position with word, and T indicates that different word differences are scored.
Step 3, VGI-POI register data validity calculate.
It registers data to pretreated VGI-POI, calculates it from two index comprehensives of attention rate and spatial distribution characteristic
Validity, specific formula for calculation are as follows:
E=α A+ β S
Wherein, E indicates virtual value, and A degree of paying close attention to, S representation space distribution characteristics, α, β are weight coefficient, and alpha+beta=
1,α,β∈[0,1].When E is more than or equal to validity threshold value, it is believed that VGI-POI data of registering are effective.
Attention rate A is measured using number is registered, and number more multilist of registering shows that concerned degree is higher.
Spatial distribution characteristic S is measured using the cluster density that spacial distribution density clustering algorithm generates, and cluster density is got over
The big down town degree for indicating VGI-POI is higher.
Step 4, the selection of VGI-POI terrestrial reference Route guiding optimal path.
VGI-POI it is designated as the VGI-POI chosen after validity calculates.Integration schedules distances, VGI-POI in path
Mark quantity and traveler establish following optimal route selection model to quantity three aspect factor known to VGI-POI terrestrial reference:
Wherein, I indicates path index, the smallest path representation optimal path of I value；N1Indicate VGI-POI terrestrial reference in path
Quantity, N2VGI-POI terrestrial reference quantity known to indicating；E is natural constant；γ1,γ2,γ3For weight coefficient, and γ1+γ2+
γ3=1, γ1,γ2,γ3∈[0,1]；DsIt indicates two-dimensional surface path distance, (max and min points is normalized using following formula
Biao Shi maximum, minimum value):
(Ds-min(Ds))/(max(Ds)-min(Ds))
Step 5, the Route guiding of the VGI-POI terrestrial reference based on optimal path.
Implement according to the following steps:
1. setting the starting point and ending point in path；
2. choosing issuable path, and calculate the distance D in paths；
3. establishing buffer area with path center line and certain distance, the number N of VGI-POI terrestrial reference in buffer area is calculated1；
4. from N1Number VGI-POI terrestrial reference middle finger makes VGI-POI terrestrial reference known to passerby, and statistics numbers N2；
5. according to Ds、N1、N2Path index I is calculated, selecting the smallest path of I value is optimal path, and as traveler provides
Path of navigation；
6. generating the Route guiding description information comprising VGI-POI terrestrial reference for optimal path.
Compared with prior art, the beneficial effects of the present invention are: VGI-POI data from ordinary populace according to the emerging of oneself
The geodata of the spontaneous sharing of interest, mass data update timely and low in cost；It is close that data of registering are able to reflect people's life
The conspicuousness and life habit feature of related VGI-POI terrestrial reference carry out Route guiding using VGI-POI terrestrial reference, will reduce people
The psychological burden of pathfinding；The present invention overcomes conventional navigation method, POI and tradition POI terrestrial reference Route guiding to a certain extent
The limitation of method helps to reduce the pathfinding time and improves navigation efficiency, and there is Route guiding to meet people space and recognize
The characteristics of knowing habit, being convenient for actual use.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the point of interest terrestrial reference path guide method of spontaneous geography information of the present invention.
Specific embodiment
Social network-i i-platform based on geographical location is that a kind of representative platform of VGI is used by mobile microblogging client
Family can carry out registering in social networks position sharing whenever and wherever possible, and referred to as VGI-POI registers data.
Present embodiment uses following technical scheme: its path guide method are as follows:
Step 1 is registered the acquisition of data based on microblogging social platform VGI-POI.
VGI-POI register data acquisition the step of it is as follows:
A token is requested to software provider 1. logging in client.
2. software provider receives verifying client's application after request, a permission is authorized.
3. client obtain permission after, jump to software service provider authorization page request authorization, at this time permission and
The readjustment link of client is sent to provider.
4. after permission passes through, user passes through the API acquisition request resource for calling microblogging to provide.
5. the data that will acquire are parsed into VGI-POI sequence, location name, address, longitude, latitude, city codes, VGI-
The record format of POI class code and number of registering.
Step 2 obtains VGI-POI and registers the pretreatments of data.
The VGI-POI obtained from microblogging social platform data of registering are pre-processed, including geographical cold spot and geography it is different
The pretreatment of structure point.
The geographical cold spot expression less point of number of registering is not enough to attract public eyeball, not have since degree of concern is low
Navigation feature.Handle the method that geographical cold spot is screened using frequency threshold value of registering is set:
LP={ VPi|Ni≤Nt, i=1,2 ..., n }
Wherein, LP indicates geographical cold spot, VPiIndicate that VGI-POI registers data, NiFor VPiCorresponding number of registering, NtFor
The frequency threshold value of registering of setting.
Geographical isomery point is since cognition of the masses to same geographic object is different, and there are multiple alias, they belong to together
One atural object, but data difference in structure is obvious.Geographical isomery point is handled using the method for merging isomery point, is calculated first different
Then structure space of points similarity and attributes similarity are merged according to whether the threshold decision of setting belongs to same geo point:
MP=MD≥DtAnd MH≥Ht
Wherein, MP indicates the geographical isomery point that can merge, MDRepresentation space similarity, DtRepresentation space similarity threshold,
MHIndicate attributes similarity, HtIndicate attributes similarity threshold value.
Space similarity MDIt is measured using two-dimensional surface linear distance, the shorter space similarity of distance is higher.
Attributes similarity MHUsing same position with word and different word difference scoring methods, compare two isomery point title character strings it
Between similarity, score with position with word be to occurring counting with the number of word in two name character string same positions, it is different
It is that the number for including different words to two name character strings counts that word difference, which is scored, and two differences scored are bigger, attribute
Similarity is higher, and specific formula for calculation is as follows:
MH=R-T
Wherein, MHIndicate attributes similarity, R expression is scored with position with word, and T indicates that different word differences are scored.
Step 3, VGI-POI register data validity calculate.
It registers data to pretreated VGI-POI, calculates it from two index comprehensives of attention rate and spatial distribution characteristic
Validity, specific formula for calculation are as follows:
E=α A+ β S
Wherein, E indicates virtual value, and A degree of paying close attention to, S representation space distribution characteristics, α, β are weight coefficient, and alpha+beta=
1,α,β∈[0,1].When E is more than or equal to validity threshold value, it is believed that VGI-POI data of registering are effective.
Attention rate A is measured using number is registered, and number more multilist of registering shows that concerned degree is higher.Attention rate A needs normalizing
Change, step are as follows:
1. choosing critical value by divided rank number m, the number that will register is divided into several grades O1,O2,…,Oj,…,
Om；
2. In Grade assigns value Q from big to small from high to low by number size of registering1,Q2,…,Qj,…,Qm；
3. each grade point deviation standardization, is mapped to result section [0,1], the attention rate A of same levels takes identical qj
Value (max and min respectively indicate maximum, minimum value):
qj=(Qj-min(Qj))/(max(Qj)-min(Qj)), j=1,2 ..., m
Spatial distribution characteristic S is measured using the cluster density that spacial distribution density clustering algorithm generates, and cluster density is got over
The big down town degree for indicating VGI-POI is higher.Spatial distribution characteristic S needs to normalize, step are as follows:
1. choosing critical value by divided rank number m, cluster density is divided into several grades O1,O2,…,Oj,…,
Om；
2. pressing cluster density size, In Grade assigns value Q from big to small from high to low1,Q2,…,Qj,…,Qm；
3. each grade point deviation standardization, is mapped to result section [0,1], the spatial distribution characteristic S of same levels takes
Identical qjValue (max and min respectively indicate maximum, minimum value):
qj=(Qj-min(Qj))/(max(Qj)-min(Qj)), j=1,2 ..., m
Step 4, the selection of VGI-POI terrestrial reference Route guiding optimal path.
VGI-POI it is designated as the VGI-POI chosen after validity calculates.
When traveler is completely strange to route, traveler has psychological pressure, often thinks that actual range is compared in path
It grows, or traveling (walking) speed can be reduced, therefore is most short by distance, i.e., traditional shortest path first mode is not most
The selection mode of shortest path.Meanwhile when the VGI-POI terrestrial reference quantity that can be provided in path is more, traveler is to VGI-POI terrestrial reference
When known quantity is more, the self-confidence of traveler will be increased, be more advantageous to the path decision behavior of traveler.
VGI-POI terrestrial reference quantity and traveler are to quantity tripartite known to VGI-POI terrestrial reference in integration schedules distance, path
Face factor establishes following optimal route selection model:
Wherein, I indicates path index, the smallest path representation optimal path of I value；N1Indicate VGI-POI terrestrial reference in path
Quantity, N2VGI-POI terrestrial reference quantity known to indicating；E is natural constant；γ1,γ2,γ3For weight coefficient, and γ1+γ2+
γ3=1, γ1,γ2,γ3∈[0,1]；DsIt indicates two-dimensional surface path distance, (max and min points is normalized using following formula
Biao Shi maximum, minimum value):
(Ds-min(Ds))/(max(Ds)-min(Ds))
Step 5, the VGI-POI terrestrial reference Route guiding based on optimal path.
Implement according to the following steps:
1. setting the starting point and ending point in path；
2. choosing issuable path, and calculate the distance D in paths；
3. establishing buffer area with path center line and certain distance, the number N of VGI-POI terrestrial reference in buffer area is calculated1；
4. from N1Number VGI-POI terrestrial reference middle finger makes VGI-POI terrestrial reference known to passerby, and statistics numbers N2；
5. according to Ds、N1、N2Path index I is calculated, selecting the smallest path of I value is optimal path, and as traveler provides
Path of navigation；
6. generating the Route guiding description information comprising VGI-POI terrestrial reference for optimal path.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and all any modifications made within the spirit and scope of the present invention are equal
Replacement and improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of point of interest terrestrial reference path guide method of spontaneous geography information, it is characterised in that: its path guide method are as follows:
Step 1 is registered the acquisition of data based on microblogging social platform VGI-POI；
Step 2 obtains VGI-POI and registers the pretreatments of data；
Step 3, VGI-POI register data validity calculate；
Step 4, the selection of VGI-POI terrestrial reference Route guiding optimal path；
Step 5, the VGI-POI terrestrial reference Route guiding based on optimal path.
2. a kind of point of interest terrestrial reference path guide method of spontaneous geography information according to claim 1, it is characterised in that:
The pretreatment of step 2 includes the pretreatment of geographical cold spot and geographical isomery point, geographical cold spot take setting register frequency threshold value into
Row screening, geographical isomery point take whether setting space similarity threshold value and attributes similarity threshold decision merge, space
Similarity uses two-dimensional surface linear distance, and attributes similarity is used with position with word and different word difference scoring methods.
3. a kind of point of interest terrestrial reference path guide method of spontaneous geography information according to claim 1, it is characterised in that:
The validity of step 3 is calculated using two index comprehensives of attention rate and spatial distribution characteristic, and attention rate is weighed using number is registered
Amount, spatial distribution characteristic are measured using the cluster density that spacial distribution density clustering algorithm generates.
4. a kind of point of interest terrestrial reference path guide method of spontaneous geography information according to claim 1, it is characterised in that:
The optimal path of step 4 is ripe to VGI-POI terrestrial reference using VGI-POI terrestrial reference quantity in integration schedules distance, path and traveler
The optimal route selection model that the quantity three aspect factor known is established carries out judgement selection.
5. a kind of point of interest terrestrial reference path guide method of spontaneous geography information according to claim 1, it is characterised in that:
The Route guiding of step 5 constitutes path of navigation using VGI-POI terrestrial reference on path description.
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Cited By (1)
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Application publication date: 20190705 |