Geodatabase Intro
Transcript of Geodatabase Intro
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Feature classes can be organized in Featuredatasets.
All feature classes in a feature dataset share thesame coordinate system.
Feature classes in a feature dataset can beorganized into a geometric network. The networkmaintains topological relationships between its
feature classes.
Feature datasets..
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Dynamic Geocoding
Annotation subclasses
Subtypes within Feature classes
Coded attribute and range domains
Improved topology and editing
More advantages..
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Design process
What data layers to include in the geodatabaseShape files Coverages
Look-up tables
How to organize the feature classes into logicalfeature datasets
Think about what topolygy rules you may want toapply how are the feature classes related to eachother spatially?
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Importing existing data
In ArcCatalog orArcToolbox Tools and wizards areavailable Works with coverages,shapefiles, tables, CAD
etc.
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Coordinate Domains Calculations
Min X ~ 2,145,320Max X ~ 2,657,580Min Y ~ 1,632,610Max Y ~ 1,967,940
Precision 1000
These coordinates would putthe data in the lower leftcorner however we want toshift this to be able to
expand in all directions
(MinX + MaxX)/2 (2.14 x 109) / (1000 x 2) = X min2,401,450 1,070,000 = 1,331,450
(MinY + MaxY)/2 (2.14 x 109) / (1000 x 2) =Y min1,800,275 1,070,000 = 730,275
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Subtypes in feature classes
Subtypes can only be created in ArcEditor and ArcInfo
- A subtype is a group of objects that havesimilar properties within the Geodatabase
For example the attribute ZoneCode may have subtypes:- Commercial, Residential, Industrial
Landcover vegetation types may have subtypes:- Forest, Agriculture, Rangeland, Urban
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Attribute Domains
Attribute domains are properties of the Geodatabase- Multiple objects may use the same domain- Can be created using the Domains propertiesdialog box
Defines legal values for field attributes- Range domains (allowable numeric value range)- Coded value domain (in dropdown menus)
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