Geodatabase Intro

7/31/2019 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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Geodatabase Intro

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