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Bb geodatabase

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Goedatabase in MSSQL

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Bb geodatabase

  1. 1. BACK to TOC GEODATABASE A data model that supports transactional views of database, objects with attributes and behaviour A physical store of geographic information inside a database management system (DBMS)Birendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  2. 2. GEODATABASE A unique data format similar in structure to coverage data model and also includes functionality for multiuser editing A storage mechanism for spatial and attribute data that contains specific storage structures for features, collection of features, attributes, relationships between attributes and relationships between featuresBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  3. 3. Benefits of Geodatabase • Centralised management of GI in a DBMS • Large data management in a continuous integrated environment • Support for multiuser editing and versioning • Advanced data types and geometry (3D coordinates, measures, true curves) • Faster and efficient data entry (data rules and relationships) • Create and edit feature linked annotations • Create and edit geometric networks • Relationships with tabular data sources stored in any standard DBMS • Create and edit topologically integrated features • Create subtypes and domains for database integrity • Support for development of industry standard data modelsBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  4. 4. Type of Geodatabase Personal Geodatabase • Built into ArcGIS • Implemented using standard desktop tools and MS Access format • Project level GIS Multiuser Geodatabase • Deployed using ArcSDE • Requires DBMS such as IBM DB2, Informix, Oracle or MS SQL Server • Enterprise GISBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  5. 5. Data formats Supports multiple formats of spatial data - • Simple features (shape files) • Custom features with business logic and editing rules • Attribute data • Metadata • Images • Raster/ grid data • CAD dataBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  6. 6. Features of Geodatabase Multiuser Editing • Multiuser access to databases through the use of versioning and long transactions (not supported by personal geodatabases) Intelligent features, Rules and Relationships • Supports objects, features (objects with geometry), advanced feature types (geometric and logical networks), true curves and complex polylinesBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  7. 7. Features of Geodatabase Feature-Linked Annotation • Labels can be converted to Annotation feature class linked to spatial features Topologically Integrated Features • Topologically associated feature classes stored in an integrated feature data set • Topological editing tools for shared-edge editing of common boundaries or cornersBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  8. 8. Features of Geodatabase Integrity Constraints • Rules on how data can be edited to ensure attribute integrity of database • Subtypes - define categories of features to distinguish objects based on different behaviours and attributes • Domains - control the allowable set of values for any field in geodatabase table (can be coded values or a range)Birendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  9. 9. Features of Geodatabase Geometric Networks • Consists of edge and junction network features • sources and sinks to model real world systems Dimensions • Special kind of map annotation to show specific lengths and distances • Supports aligned and linear dimensionsBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  10. 10. Features of Geodatabase Relationships • Define advanced relationhsips among multiple tables in the DBMS • Organised into relationship classes Validation rules • Attribution rules - subtypes and domains • Connectivity rules - constrain the type of network features that may be connected to one another • Relationship rules - control which object subtypes from the origin class can be related to which object subtypes in destination class • Custom rules- rules can be created for specific data models using ArcObjectsBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  11. 11. Creating Geodatabase When designing a geodatabase, consider questions like: • What kind of data will be stored in the database? • In what projection do you want your data stored? • Do you want to establish rules about how the data can be modified? • How do you want to organize your object classes and subtypes? • Do you want to maintain special relationships between objects of different types? • Will your database contain networks? • Will your database store custom objects?Birendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  12. 12. Creating a new geodatabase from scratchBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  13. 13. Migrating existing data into the geodatabaseBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  14. 14. Building geodatabases with CASE toolsBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD)
  15. 15. Further refining the geodatabase • establish relationships between objects in different object classes • connectivity rules for objects participating in geometric networks • use geodatabase management tools in ArcCatalog to refine or extend a mature database throughout its lifeBirendra Bajracharya , International Centre for Integrated Mountain Development (ICIMOD) BACK to TOC

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