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CN106802958A - Conversion method and system of the CAD data to GIS data - Google Patents

Conversion method and system of the CAD data to GIS data Download PDF

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Publication number
CN106802958A
CN106802958A CN201710039533.4A CN201710039533A CN106802958A CN 106802958 A CN106802958 A CN 106802958A CN 201710039533 A CN201710039533 A CN 201710039533A CN 106802958 A CN106802958 A CN 106802958A
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China
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terrain data
data symbol
characteristic information
terrain
symbol
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CN201710039533.4A
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CN106802958B (en
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陈华
张超
郭喜亮
罗军
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Fujian G Mdt Infotech Ltd
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Fujian G Mdt Infotech Ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/29Geographical information databases

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Remote Sensing (AREA)
  • Data Mining & Analysis (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Processing Or Creating Images (AREA)

Abstract

The embodiment of the invention discloses the conversion method and system of a kind of CAD data to GIS data.The method includes:Mapping table between the characteristic information of the terrain data symbol in the terrain data model and CAD software system set up in generalized information system in the generalized information system in advance;When the topographic map that will be made in the CAD software system is imported in the generalized information system, the characteristic information of the multiple terrain data symbols in the topographic map is extracted;Characteristic information according to the multiple terrain data symbol for extracting in the generalized information system finds the multiple terrain data symbol in the mapping table and distinguishes corresponding terrain data model, so as to according to the multiple terrain data symbol, the topographic map being made in the CAD software system is converted to the corresponding terrain data model geographical terrain figure in the generalized information system respectively.The present invention can improve accuracy rate when importing the graphical symbol in the drawing in CAD in GIS software and be converted to the corresponding geographical graphic in GIS, while also improving drawing efficiency.

Description

Conversion method and system of the CAD data to GIS data
Technical field
The present invention relates to CAD data switch technology field, more particularly to a kind of CAD data is to the conversion method of GIS data And CAD data is to the converting system of GIS data.
Background technology
How symbol shares always one problem between CAD software and GIS software, to find out its cause, being data mould in GIS Type and CAD cartographic data model differences.GIS stresses geoanalysis, and centered on geographic object, and CAD drawing is in order to meet system The requirement of figure specification, centered on figure, cannot often keep the complete geographic significance of data, cause to be accorded with when geodata is shared Number information is lost, deformation.
The graphical symbol in the drawing in CAD is imported in GIS software at present and is converted to the corresponding geographical map in GIS Shape accuracy rate is relatively low, and drawing efficiency is also more low.
The content of the invention
It is an object of the invention to provide the conversion method and system of a kind of CAD data to GIS data, to improve the above-mentioned back of the body One or more problem present in the scheme that scape technology segment is mentioned.
A kind of first aspect according to embodiments of the present invention, there is provided the conversion method of CAD data to GIS data, described turn The method of changing includes:
A ground in the terrain data model and CAD software system set up in generalized information system in the generalized information system in advance Mapping table between the characteristic information of graphic data symbol;
When the topographic map that will be made in the CAD software system is imported in the generalized information system, the topographic map is extracted In multiple terrain data symbols characteristic information;
Characteristic information in the generalized information system according to the multiple terrain data symbol for extracting is in the corresponding relation The multiple terrain data symbol is found in table and distinguishes corresponding terrain data model, so as to according to the multiple terrain data The topographic map being made in the CAD software system is converted to the GIS systems to symbol by the corresponding terrain data model respectively Geographical terrain figure in system.
In a kind of exemplary embodiment of the invention, the landform set up in generalized information system in the generalized information system in advance Mapping table between the characteristic information of the terrain data symbol in data model and CAD software system includes:
The multiple terrain data symbols in the CAD software system are obtained, the property value to each terrain data symbol enters Row Hash calculation obtains a corresponding unique cryptographic Hash, using the cryptographic Hash as the characteristic information;
The identification with the recognition accuracy between each self-corresponding terrain data model is carried out to each terrain data symbol Training, when after recognition training the recognition accuracy be more than or equal to a predetermined threshold value when, by the terrain data model with it is corresponding The cryptographic Hash of the terrain data symbol associate to form the mapping table.
In a kind of exemplary embodiment of the invention, the spy for extracting the multiple terrain data symbols in the topographic map Reference breath includes:
Hash calculation is carried out respectively to the property value of the multiple terrain data symbol and obtains corresponding multiple cryptographic Hash, will The multiple cryptographic Hash as extract the topographic map in corresponding the multiple terrain data symbol characteristic information.
In a kind of exemplary embodiment of the invention, the feature letter according to the multiple terrain data symbol for extracting Breath finds the multiple terrain data symbol in the mapping table distinguishes corresponding terrain data model includes:
Corresponding multiple cryptographic Hash are distinguished according to the multiple terrain data symbol being calculated, in the corresponding relation The multiple terrain data symbol is found in table and distinguishes corresponding terrain data model.
In a kind of exemplary embodiment of the invention, the feature letter of the multiple terrain data symbols in the topographic map is extracted After breath, methods described also includes:
Judge the characteristic information of terrain data symbol described in extract whether described by Bloom filter algorithm In generalized information system:
If so, then the characteristic information in the generalized information system according to the terrain data symbol for extracting is in the corresponding relation Searched to carry out subsequent treatment in table;
If it is not, then the terrain data model in the characteristic information of the newly-built terrain data symbol and the generalized information system it Between corresponding relation.
A kind of second aspect according to embodiments of the present invention, there is provided the converting system of CAD data to GIS data, described turn The system of changing includes:
Data set up module, for the terrain data model set up in generalized information system in advance in the generalized information system with Mapping table between the characteristic information of the terrain data symbol in CAD software system;
Data extraction module, for being imported in the generalized information system when the topographic map that will be made in the CAD software system When, extract the characteristic information of the multiple terrain data symbols in the topographic map;
Data conversion module, according to the characteristic information of the multiple terrain data symbol for extracting in the generalized information system The multiple terrain data symbol is found in the mapping table and distinguishes corresponding terrain data model, so as to according to institute Multiple terrain data symbols topographic map that the corresponding terrain data model will be made in the CAD software system respectively is stated to turn It is changed to the geographical terrain figure in the generalized information system.
In a kind of exemplary embodiment of the invention, the data set up module, are used for:
The multiple terrain data symbols in the CAD software system are obtained, the property value to each terrain data symbol enters Row Hash calculation obtains a corresponding unique cryptographic Hash, using the cryptographic Hash as the characteristic information;
The identification with the recognition accuracy between each self-corresponding terrain data model is carried out to each terrain data symbol Training, when after recognition training the recognition accuracy be more than or equal to a predetermined threshold value when, by the terrain data model with it is corresponding The cryptographic Hash of the terrain data symbol associate to form the mapping table.
In a kind of exemplary embodiment of the invention, the data extraction module is used for:
Hash calculation is carried out respectively to the property value of the multiple terrain data symbol and obtains corresponding multiple cryptographic Hash, will The multiple cryptographic Hash as extract the topographic map in corresponding the multiple terrain data symbol characteristic information.
In a kind of exemplary embodiment of the invention, the data conversion module is used for:
Corresponding multiple cryptographic Hash are distinguished according to the multiple terrain data symbol being calculated, in the corresponding relation The multiple terrain data symbol is found in table and distinguishes corresponding terrain data model.
In a kind of exemplary embodiment of the invention, the converting system also includes data judge module, is used for:
After the characteristic information of the multiple terrain data symbols in extracting the topographic map, by Bloom filter algorithm Judge the characteristic information of terrain data symbol described in extract whether in the generalized information system:
If so, then the characteristic information in the generalized information system according to the terrain data symbol for extracting is in the corresponding relation Searched to carry out subsequent treatment in table;
If it is not, then the terrain data model in the characteristic information of the newly-built terrain data symbol and the generalized information system it Between corresponding relation.
The technical scheme that embodiments of the invention are provided can include the following benefits:
A terrain data model and CAD software that the embodiment of the present invention is set up in the generalized information system in generalized information system in advance Mapping table between the characteristic information of the terrain data symbol in system, so when will in the CAD software system make Into a topographic map import when in the generalized information system, the feature of the multiple terrain data symbols in the topographic map can be extracted Information, then the characteristic information in the generalized information system according to the multiple terrain data symbol for extracting is in the correspondence pass It is to find the multiple terrain data symbol in table to distinguish corresponding terrain data model, such that it is able to according to the multiple Graphic data symbol respectively the corresponding terrain data model topographic map being made in the CAD software system is converted to it is described Geographical terrain figure in generalized information system.Terrain data model and CAD software system are stored due to being pre-build in generalized information system In terrain data symbol corresponding relation between the two, figure conversion efficiency can be improved in conversion and then drawing effect is improved Rate, while so that the graphical symbol in the drawing in CAD to be imported the corresponding geography in GIS software and in being converted to GIS Accuracy rate during figure increases.
Brief description of the drawings
Fig. 1 shows conversion method flow chart of the CAD data to GIS data in exemplary embodiment of the present;
Fig. 2 shows conversion method flow chart of another CAD data to GIS data in exemplary embodiment of the present;
Fig. 3 shows the another CAD data of exemplary embodiment of the present to flow chart in the conversion method of GIS data;
Fig. 4 shows converting system schematic diagram of the CAD data to GIS data in exemplary embodiment of the present;
Fig. 5 shows converting system schematic diagram of another CAD data to GIS data in exemplary embodiment of the present.
Specific embodiment
Example embodiment is described more fully with referring now to accompanying drawing.However, example embodiment can be with various shapes Formula is implemented, and is not understood as limited to example set forth herein;Conversely, thesing embodiments are provided so that the present invention will more Fully and completely, and by the design of example embodiment those skilled in the art is comprehensively conveyed to.Described feature, knot Structure or characteristic can be combined in one or more implementation methods in any suitable manner.
Additionally, accompanying drawing is only schematic illustrations of the invention, it is not necessarily drawn to scale.Identical accompanying drawing mark in figure Note represents same or similar part, thus will omit repetition thereof.Some block diagrams shown in accompanying drawing are work( Energy entity, not necessarily must be corresponding with physically or logically independent entity.These work(can be realized using software form Energy entity, or these functional entitys are realized in one or more hardware modules or integrated circuit, or at heterogeneous networks and/or place These functional entitys are realized in reason device device and/or microcontroller device.
The embodiment of the present invention shows a kind of CAD data to the conversion method of GIS data.With reference to shown in Fig. 1, the CAD Data can include to the conversion method of GIS data:
Step S101:The terrain data model set up in generalized information system in the generalized information system in advance and CAD software system Mapping table between the characteristic information of the terrain data symbol in system.
In the present embodiment, the terrain data symbol can be the various graphical symbols of the Points And lines composition in CAD, such as just Square, rectangle, circle etc..The graphical symbol described in CAD has property value, the property value that such as SHP files are included, property value For characterizing the geographical terrain model representated by the graphical symbol.
It is in one exemplary embodiment, described to be set up in generalized information system in the generalized information system in advance with reference to shown in Fig. 2 Mapping table between the characteristic information of the terrain data symbol in terrain data model and CAD software system can include:
Step S201:The multiple terrain data symbols in the CAD software system are obtained, to each terrain data symbol Property value carries out Hash calculation and obtains a corresponding unique cryptographic Hash, using the cryptographic Hash as the characteristic information.Here, Specific Hash calculation may be referred to existing hash algorithm, no longer describe in detail.
Step S202:It is accurate with identification between each self-corresponding terrain data model that each terrain data symbol is carried out The recognition training of degree, when the recognition accuracy is more than or equal to a predetermined threshold value after recognition training, by the terrain data mould Type associates to form the mapping table with the cryptographic Hash of the corresponding terrain data symbol.
Here, the recognition training can be realized based on existing machine recognition training algorithm, such as clustering algorithm, tool Body refers to existing mature technology, and here is omitted.By being identified training to each terrain data symbol in advance, work as knowledge Not Xun Lian after recognition accuracy when being more than or equal to a predetermined threshold value (such as recognition accuracy reaches 85%~99%), set up each Corresponding relation between the corresponding terrain data model of individual terrain data symbol, to improve data symbol during actual converted Recognition accuracy.In addition, amount of calculation can be reduced above by Hash calculation, memory space is saved, improve data-handling efficiency.
Step S102:When the topographic map that will be made in the CAD software system is imported in the generalized information system, extract The characteristic information of the multiple terrain data symbols in the topographic map.
In one exemplary embodiment, the characteristic information for extracting the multiple terrain data symbols in the topographic map can To include:Hash calculation is carried out respectively to the property value of the multiple terrain data symbol and obtains corresponding multiple cryptographic Hash, will The multiple cryptographic Hash as extract the topographic map in corresponding the multiple terrain data symbol characteristic information.
Here, it is to be converted for one during actual converted after recognition training before sets up the mapping table The topographic map made in CAD, to the topographic map in the property value of multiple terrain data symbols carry out Hash meter respectively Calculation obtains corresponding multiple cryptographic Hash, subsequently to find each ground figurate number in the mapping table according to the cryptographic Hash According to the corresponding terrain data model in generalized information system of symbol.
Step S103:Characteristic information in the generalized information system according to the multiple terrain data symbol for extracting is in institute State and find in mapping table the multiple terrain data symbol and distinguish corresponding terrain data model, so as to according to described many The corresponding terrain data model is converted to the topographic map being made in the CAD software system to individual terrain data symbol respectively Geographical terrain figure in the generalized information system.
In one exemplary embodiment, the characteristic information according to the multiple terrain data symbol for extracting is described The multiple terrain data symbol is found in mapping table distinguishing corresponding terrain data model to include:According to calculating The multiple terrain data symbol for obtaining distinguishes corresponding multiple cryptographic Hash, is found in the mapping table described many Individual terrain data symbol distinguishes corresponding terrain data model.
Here, when multiple terrain datas symbol in step s 102 described in the actual CAD to be converted of extraction in topographic map Number characteristic information be cryptographic Hash after, each terrain data symbol correspondence is found in the mapping table according to cryptographic Hash The terrain data model in generalized information system.Then just can be in the generalized information system according to terrain data model is set up The corresponding geographical terrain figure of topographic map.Terrain data model and CAD software system are stored due to being pre-build in generalized information system In terrain data symbol corresponding relation between the two, figure conversion efficiency can be improved in conversion and then drawing effect is improved Rate, while passing through recognition training so that the graphical symbol in the drawing in CAD is being imported in GIS software and GIS systems are converted to Accuracy rate during corresponding geographical graphic in system increases.
With reference to shown in Fig. 3, on the basis of above-described embodiment, in one exemplary embodiment, in the extraction topographic map Multiple terrain data symbols characteristic information after, methods described can also include:
Step S301:By Bloom filter algorithm judge extract one described in terrain data symbol characteristic information whether In the generalized information system.Judge further reduce memory space by Bloom filter algorithm, it is to avoid take GIS systems Memory space in system and influence the normal operation of generalized information system.The specific calculating process of the Bloom filter algorithm can join Existing mature technology is examined, is no longer described in detail.
Step S302:If so, then the characteristic information in the generalized information system according to the terrain data symbol for extracting is described Searched to carry out subsequent treatment in mapping table.The subsequent treatment is the handling process in above-described embodiment, specific ginseng The correspondence description in previous embodiment is examined, here is omitted.
Step S303:If it is not, the then ground figurate number in the characteristic information of the newly-built terrain data symbol and the generalized information system According to the corresponding relation between model.Here, that is to say, that when judgement show that the terrain data symbol of extraction is not pre-building Mapping table in, i.e., the terrain data symbol is a new element, then need to the new element set up and terrain data Corresponding relation between model, specifically refers to recognition training process as shown in Figure 2, repeats no more.So so that the method Adaptability it is stronger, automatic identification judge make respective handling, further increase to a certain extent data-handling efficiency with And the efficiency of drawing.
It should be noted that although each step of method in the present invention is described with particular order in the accompanying drawings, This does not require that or implies must perform these steps according to the particular order, or have to carry out the step shown in whole Desired result could be realized.It is additional or alternative, it is convenient to omit some steps, multiple steps are merged into a step and is held OK, and/or by a step execution of multiple steps etc. are decomposed into.In addition, being also easy to understand, these steps can be For example either synchronously or asynchronously performed in multiple module/process/threads.
Further, in this example embodiment, a kind of CAD data to the converting system of GIS data is additionally provided.With reference to Shown in Fig. 4, system 100 can set up module 101, data extraction module 102 and data conversion module 103 including data.Its In:
The data set up module 101, for the terrain data set up in generalized information system in advance in the generalized information system Mapping table between the characteristic information of the terrain data symbol in model and CAD software system.
The data extraction module 102, described in being imported when the topographic map that will be made in the CAD software system When in generalized information system, the characteristic information of the multiple terrain data symbols in the topographic map is extracted.
The data conversion module 103, according to the spy of the multiple terrain data symbol for extracting in the generalized information system Reference breath finds the multiple terrain data symbol in the mapping table and distinguishes corresponding terrain data model, so that According to the multiple terrain data symbol ground that the corresponding terrain data model will be made in the CAD software system respectively Shape figure is converted to the geographical terrain figure in the generalized information system.
In a kind of exemplary embodiment of the invention, the data set up module 101, soft specifically for obtaining the CAD Multiple terrain data symbols in part system, Hash calculation is carried out to the property value of each terrain data symbol, and to obtain one corresponding Unique first cryptographic Hash, using first cryptographic Hash as the characteristic information;Each terrain data symbol is carried out with respectively The recognition training of the recognition accuracy between self-corresponding terrain data model, the recognition accuracy is more than after recognition training During equal to a predetermined threshold value, the terrain data model is associated to form institute with the cryptographic Hash of the corresponding terrain data symbol State mapping table.
In a kind of exemplary embodiment of the invention, the data extraction module 102, specifically for the multiple landform The property value of data symbol carries out Hash calculation and obtains corresponding multiple cryptographic Hash respectively, using the multiple cryptographic Hash as extraction The topographic map in corresponding the multiple terrain data symbol characteristic information.
In a kind of exemplary embodiment of the invention, the data conversion module 103 is calculated specifically for basis The multiple terrain data symbol distinguishes corresponding multiple cryptographic Hash, and the multiple landform is found in the mapping table Data symbol distinguishes corresponding terrain data model.
As shown in figure 5, in a kind of exemplary embodiment of the invention, the converting system 100 can also be sentenced including data Disconnected module 104, is used for:After the characteristic information of the multiple terrain data symbols in extracting the topographic map, by the grand mistake of cloth Whether filter algorithm judges the characteristic information of terrain data symbol described in extract in the generalized information system, if so, then existing Characteristic information in the generalized information system according to the terrain data symbol for extracting is searched to carry out in the mapping table Subsequent treatment;If it is not, then the terrain data model in the characteristic information of the newly-built terrain data symbol and the generalized information system it Between corresponding relation.
On the system in above-described embodiment, wherein modules perform the concrete mode of operation in relevant the method Embodiment in be described in detail, explanation will be not set forth in detail herein.
Although it should be noted that being referred to some modules or list of the equipment for action executing in above-detailed Unit, but this division is not enforceable.In fact, according to the embodiment of the present invention, it is above-described two or more The feature and function of module or unit can embody in a module or unit.Conversely, an above-described mould The feature and function of block or unit can be further divided into being embodied by multiple modules or unit.As module or list The part of unit's display can be or may not be physical location, you can with positioned at a place, or can also be distributed to On multiple NEs.Some or all of module therein can be according to the actual needs selected to realize the open scheme of wood Purpose.Those of ordinary skill in the art are without creative efforts, you can to understand and implement.
Through the above description of the embodiments, those skilled in the art is it can be readily appreciated that example described herein is implemented Mode can be realized by software, it is also possible to be realized by way of software is with reference to necessary hardware.Therefore, according to the present invention The technical scheme of implementation method can be embodied in the form of software product, and the software product can store non-volatile at one Property storage medium (can be CD-ROM, USB flash disk, mobile hard disk etc.) in or network on, including some instructions are causing a calculating Equipment (can be personal computer, server or network equipment etc.) performs the method according to embodiment of the present invention.
Those skilled in the art considering specification and after putting into practice invention disclosed herein, will readily occur to it is of the invention its Its embodiment.The application is intended to any modification of the invention, purposes or adaptations, these modifications, purposes or Person's adaptations follow general principle of the invention and including undocumented common knowledge in the art of the invention Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by appended Claim is pointed out.

Claims (10)

1. conversion method of a kind of CAD data to GIS data, it is characterised in that methods described includes:
A ground figurate number in the terrain data model and CAD software system set up in generalized information system in the generalized information system in advance According to the mapping table between the characteristic information of symbol;
When the topographic map that will be made in the CAD software system is imported in the generalized information system, in the extraction topographic map The characteristic information of multiple terrain data symbols;
Characteristic information in the generalized information system according to the multiple terrain data symbol for extracting is in the mapping table Find the multiple terrain data symbol and distinguish corresponding terrain data model, so as to according to the multiple terrain data symbol During the topographic map being made in the CAD software system is converted to the generalized information system by the corresponding terrain data model respectively Geographical terrain figure.
2. conversion method according to claim 1, it is characterised in that described that the generalized information system is set up in generalized information system in advance In terrain data model and CAD software system in terrain data symbol characteristic information between mapping table include:
The multiple terrain data symbols in the CAD software system are obtained, the property value to each terrain data symbol is breathed out It is uncommon to be calculated a corresponding unique cryptographic Hash, using the cryptographic Hash as the characteristic information;
The recognition training with the recognition accuracy between each self-corresponding terrain data model is carried out to each terrain data symbol, It is when the recognition accuracy is more than or equal to a predetermined threshold value after recognition training, the terrain data model is described with corresponding The cryptographic Hash of terrain data symbol associates to form the mapping table.
3. conversion method according to claim 2, it is characterised in that the multiple terrain datas in the extraction topographic map The characteristic information of symbol includes:
Carry out Hash calculation respectively to the property value of the multiple terrain data symbol and obtain corresponding multiple cryptographic Hash, will be described Multiple cryptographic Hash as extract the topographic map in corresponding the multiple terrain data symbol characteristic information.
4. conversion method according to claim 3, it is characterised in that described according to the multiple terrain data symbol for extracting Characteristic information the multiple terrain data symbol found in the mapping table distinguish corresponding terrain data model Including:
Corresponding multiple cryptographic Hash are distinguished according to the multiple terrain data symbol being calculated, in the mapping table Find the multiple terrain data symbol and distinguish corresponding terrain data model.
5. the conversion method according to any one of Claims 1 to 4, it is characterised in that extract the multiple ground in the topographic map After the characteristic information of graphic data symbol, methods described also includes:
Judge the characteristic information of terrain data symbol described in extract whether in the GIS systems by Bloom filter algorithm In system:
If so, then the characteristic information in the generalized information system according to the terrain data symbol for extracting is in the mapping table Searched to carry out subsequent treatment;
If it is not, then between the terrain data model in the characteristic information and the generalized information system of the newly-built terrain data symbol Corresponding relation.
6. converting system of a kind of CAD data to GIS data, it is characterised in that the converting system includes:
Data set up module, and the terrain data model for being set up in generalized information system in advance in the generalized information system is soft with CAD Mapping table between the characteristic information of the terrain data symbol in part system;
Data extraction module, for when the topographic map that will be made in the CAD software system is imported in the generalized information system, Extract the characteristic information of the multiple terrain data symbols in the topographic map;
Data conversion module, the characteristic information in the generalized information system according to the multiple terrain data symbol for extracting is in institute State and find in mapping table the multiple terrain data symbol and distinguish corresponding terrain data model, so as to according to described many The corresponding terrain data model is converted to the topographic map being made in the CAD software system to individual terrain data symbol respectively Geographical terrain figure in the generalized information system.
7. converting system according to claim 6, it is characterised in that the data set up module, are used for:
The multiple terrain data symbols in the CAD software system are obtained, the property value to each terrain data symbol is breathed out It is uncommon to be calculated a corresponding unique cryptographic Hash, using the cryptographic Hash as the characteristic information;
The recognition training with the recognition accuracy between each self-corresponding terrain data model is carried out to each terrain data symbol, It is when the recognition accuracy is more than or equal to a predetermined threshold value after recognition training, the terrain data model is described with corresponding The cryptographic Hash of terrain data symbol associates to form the mapping table.
8. converting system according to claim 7, it is characterised in that the data extraction module, is used for:
Carry out Hash calculation respectively to the property value of the multiple terrain data symbol and obtain corresponding multiple cryptographic Hash, will be described Multiple cryptographic Hash as extract the topographic map in corresponding the multiple terrain data symbol characteristic information.
9. converting system according to claim 8, it is characterised in that the data conversion module, is used for:
Corresponding multiple cryptographic Hash are distinguished according to the multiple terrain data symbol being calculated, in the mapping table Find the multiple terrain data symbol and distinguish corresponding terrain data model.
10. converting system according to claim 6, it is characterised in that the converting system also includes data judge module, uses In:
After the characteristic information of the multiple terrain data symbols in extracting the topographic map, judged by Bloom filter algorithm Whether the characteristic information of terrain data symbol is in the generalized information system described in for extracting:
If so, then the characteristic information in the generalized information system according to the terrain data symbol for extracting is in the mapping table Searched to carry out subsequent treatment;
If it is not, then between the terrain data model in the characteristic information and the generalized information system of the newly-built terrain data symbol Corresponding relation.
CN201710039533.4A 2017-01-18 2017-01-18 Conversion method and system of the CAD data to GIS data Expired - Fee Related CN106802958B (en)

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