Multilevel Updating Method of Three- Dimensional Spatial Database Presented By: Tristram Taylor SE521

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1 Multilevel Updating Methd f Three- Dimensinal Spatial Database Presented By: Tristram Taylr SE521

2 Written By: Yangting Liu, Gang Liu, Zhenwen He, Zhengping Weng Frm: China University f Gesciences Fr: th Internatinal Cnference n Geinfrmatics

3 Cntents What is a Spatial Database? Intrductin The Analysis f Features f 3D Spatial Data Update Multilevel Data Updating Methd and Its Applicatin Test Results and Analysis Cnclusin

4 What is a Spatial Database? Spatial Database - is a database that is ptimized t stre and query data that is related t bjects in space, including pints, lines and plygns. While typical databases can understand varius numeric and character types f data, additinal functinality needs t be added fr databases t prcess spatial data types. Spatial Queries - where predicates fr selectin deal with spatial parameters. Spatial Analysis Operatins - used t uncver spatial relatinships within and amng mapped data layers.

5 Intrductin Utilizes ArcSDE (Spatial Data Engine) In their system, they incrprate the SDO_Gemetry, which is an abstract data type prvided by Oracle Spatial. They incrprate Oracle C++ Calling Interface (OCCI) instead f ODBC r JDBC t access and update the spatial data. This paper intrduces the multilevel spatial data updating methd t schedule and update massive 3D spatial data, and imprve the efficiency, interactin and integrity f spatial databases.

6 The Analysis f Features f 3D Spatial Data Update

7 Features f 3D Spatial Data SDO_Gemetry is cmpsed f several parameters indicating gemetry type (pint, plane, line, etc.), dimensin, and an array with the x,y,z crdinates. Traditinal 2D data pses its wn challenges: Spatial features Unstructured features Spatial relatinship features Classificatin and cding features Massive data Nn-standard algebraic peratins 3D data pses thse challenges as well as: Semantics f abvegrund and undergrund Multiplicity f gemetry and texture prperties Huge quantity f data Cmplicated relatinships between mdels.

8 Difficulties During 3D Data Updating Traditinally, 3D spatial data is mdeled using the general mdel. Integrates abvegrund and undergrund. Gelgical bdies, pipelines, rads, discrete buildings, and ther bject differ significantly is aspects f: Gemetry Appearance Semantics Tplgy Massive 3D spatial data has multilevel and multi-categry features These features cause users t ignre the integrity f the spatial entity This leads t decreasing efficiency. This prject utilizes an bject riented mdel t imprve updating efficiency.

9 Multilevel Data Updating Methd and Its Applicatin

Multilevel Data Updating Methd The bject-riented mdel treats the bject entity as a unit t stre and manage spatial gemetric elements and emphasizes the integrity f the spatial entity.

10 Multilevel Data Updating Methd The bject-riented mdel treats the bject entity as a unit t stre and manage spatial gemetric elements and emphasizes the integrity f the spatial entity. Utilizes existing tplgical relatinships between entities t reduce the input quantity f data while hlding the basic features f spatial entities. Lcal updating f OO data mdels is mre cnvenient. Inserting, deleting, r updating ne entity will nt affect the ther entities, s efficiency is higher.

Multilevel Structure f Spatial Data In cmmn GIS systems spatial data is usually expressed by using a layered structure, s it s cnvenient t manipulate and stre features,

11 Multilevel Structure f Spatial Data In cmmn GIS systems spatial data is usually expressed by using a layered structure, s it s cnvenient t manipulate and stre features, but the elements have bvius hierarchy n the space used. This means cmbining features f structured, unstructured, and OO features. This prject adpts the fllwing lgic mdel:

12 Table 1: Lgic Mdel f Feature Objects

13 Updating Prcess f BLOB field

The updating f SDO_Gemetry field In the bject-relatinal mdel f Spatial the descriptin f the gemetry f spatial data entities is stred in the bject type SDO_Gemetry, which is

SDO_Gemetry is used t increase the speed f dispatching and querying data by string the bunding bx infrmatin f the spatial data Integrating abvegrund and undergrund infrmatin t

14 The updating f SDO_Gemetry field In the bject-relatinal mdel f Spatial the descriptin f the gemetry f spatial data entities is stred in the bject type SDO_Gemetry, which is defined in tables by users. SDO_Gemetry is used t increase the speed f dispatching and querying data by string the bunding bx infrmatin f the spatial data Integrating abvegrund and undergrund infrmatin t establish a spatial index. SDO_GTYPE type f spatial entity (fixed) SDO_ELEM_INFO (fixed) interprets the crdinate values defined by: SDO_ORDINATES crdinate value Defined by variable length array Type NUMBER t stre crdinate value and frm the bundary The prcess f updating SDO_GTYPE and SDO_ELEM_INFO is mainly t update SDO_ORDINATES.

15 Updating SDO_GEOMETRY Update feature(id, Feature) where ID is the feature class ID and Feature is the updating bject: Begin //update the attribute data Bund = Feature.Get bund(); //btain updated infrmatin f bunding bx SDO_GEOMETRY sd_gemetry; //establish new gemetry bject NUMBER gtype = 3008; Vectr<NUMBER> elem_inf; elem_inf.pushback (1); elem_inf.pushback (1007); elem_inf.pushback (3); //establish sd_gtype and sd_elem_inf sd_gemetry.set std_gtype (gtype); sd_gemetry.set std_elem_inf (elem_inf); sd_gemetry.set std_rdinates (bund); Set bject (sd_gemetry); //set infrmatin f SDO_GEOMETRY bject //update un-structured data End

16 The Design f the Adaptive Imprt Algrithm f Attribute Data Three types f file frmats: Txt text Excel sheet Access database Users select input data t judge if the attribute structure matches the existing ne currently in database. If it s a match, user selects input mdel Item-by-item Attribute item has t be chsen Entire mdel quantity cnsistency must be calculated If cnsistent, attribute data will be imprted t database successfully.

17 The Adaptive Imprt Algrithm f Attribute Data

18 The Design f the Update Mdule in the Applicatin Layer The main functins f the update mdule f the 3D Spatial Data Management Tl in the applicatin layer are: Insert Mdify Batch replace the feature bjects Adaptive imprt attribute data in multi-mde methd

19 Design f the Update Mdule Interface

20 Steps Fr Updating Data The data management tls in client-side send request t unifrm access interface f SDE, including the infrmatin f prject, feature class and feature bjects; T see if the awaiting updating data exist in cache. If it exists, dispatch them t applicatin layer, therwise, cnnect the database and dispatch data frm database. The data is updated in client side and transmits updated data t be warehused requires by users, then, the updated data waits t be laded int database while The cnsistency and integrity f data are checked. If it mismatches the cnditin, the errr message is returned t client side, then update is restarted If matches the cnditin, updated data will be laded int database, the updated feature bjects and the peratins are recrded by database lg, which can be cnsulted by users.

21 Flw Chart f Updating Data Prcedure

22 Imprting Attribute Data with DTA Management Tl

23 Test Results and Analysis

24 The Test The update mdule f 3D spatial data management tl GV3dCatalg is develped. It is used fr abvegrund and undergrund data. The Oracle_11g is adpted as the backgrund database. Visual C++ is used as the develping language. The tl supplies the functins f warehusing, brwsing, updating, and exprting abvegrund and undergrund data.

25 Imprting Original Data int Database The riginal data is imprted int the database. Element type f cmmercial building is selected.

26 Selecting Feature Object Select ne building t delete, and the thers t mdify in batch mdel.

27 Deleting the Appinted Feature Object During update the element bject t be mdified is checked t see if it matches cnsistency and integratin f data.

28 Cnclusin In rder t slve the issue f cmplexity, integrity and efficiency f spatial data, the OCCI technlgy and bject relatin mdel supprted by Oracle Spatial is adpted fr three dimensinal spatial data multilevel updating and its realizatin based n research and analysis n spatial data engine thery and technlgy. With applicatin f this methd in three dimensinal spatial data management tl fr scheduling and updating the massive spatial data, the updating efficiency is imprved significantly. Meanwhile, hw t crdinate the relatinship between updating spatial infrmatin and visualizatin envirnment, spatial analysis peratin, is still t be cnsidered in future.

29 Questins?

30 Surces Multilevel Updating Methd f Three-dimensinal Spatial Database : Yanting Liu, Gang Liu*, Zhenwen He, Zhengping Weng; Faculty f Cmputer Science and Technlgy, China University f Gesciences(Wuhan); Wuhan, China t%20n%203d%20spatial%20data%20(eng)%20revisin%201.1.pdf

Two-Dimensional Topology Structure between Vector Layers in GIS

Two-Dimensional Topology Structure between Vector Layers in GIS 2011, Scienceline Publicatin Jurnal f Civil Engineering and Urbanism Vlume 1, Issue 1: 10-14 (2011) ISSN-2252-0430 Tw-Dimensinal Structure between Vectr Layers in GIS Davd Parvinnezhad Hkmabadi* 1, Ali