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GIS Applications Geog 329 > Geodatabases / Introduction > Flashcards

Geodatabases / Introduction Flashcards

1
Q

Compare & contrast GI Systems vs GI Science

A
  • GI Systems is a tool
  • GI science is how that tool/how to use that tool, gathering , analyzing, interpreting, distributing, and using geographic info
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2
Q

What is GIS?

- Basic definition

A

GIS is the science & technology of gathering, analyzing, interpreting, distributing, and using geographic information

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3
Q

Quote describing the users of GIS

A

“The application of GIS is only limited by the imagination of those who use it”

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4
Q

Dark side of GIS

A

Exploitation, military, data ownership & accessibility

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5
Q

Form Vs. Process

A

Example:
Form-used a union
Process-why the union was used

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6
Q

Big Questions & skillsets of GI Science

A
  • Modelling
  • User interface (how to make better for people)
  • Data (Where to get it, how to create it, transformations of state
  • Visualization of geographic data/information
  • Process over Form
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7
Q

What is the theme for 329?

A

Science!

- data, applications, customization & spatial analyses

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8
Q

Attribute Data

A
  • Nature of data
  • Database approach to attribute
  • Geodatabase approach in ArcGIS
  • Descriptive info about spatial features (Quantitative, Qualitative)
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9
Q

Spatial Analysis

A

Need the what (attributes) and the where (location)

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10
Q

What do spatial data queries refer to?

A

The process of retrieving a data subset from a layer by working directly with the features

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11
Q

Database

A

Collection of related data usually stored as a single or multiple files

  • Distributed access
  • Streamline storage
  • Data stored independently of application
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12
Q

Shapefile vs. Feature class

A

Shape file used to be proprietary to ESRI but is now default and can be used by many applications
Feature classes are closed and can only be used by ESRI and certain groups

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13
Q

Relational Database Model in GIS

A
  • Defining things as actual objects, not just as vectors
  • Data are organized by records in relation which resemble a table
  • Must have a similar identifier between tables that are the exact same spelling
  • Based on unique ID’s that are present and the same in the tables
  • Custom designed
  • Direct link to commercial relational database models
  • Both spatial & attribute data
  • Standard Query language
  • Object relational database management system
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14
Q

Column =

A

Property

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15
Q

Row =

A

Object

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16
Q

Table =

A

Object Class

- Object classes with geometry called feature classes

17
Q

Geodatabase Basics:

Tables

A

Non spatial data

18
Q

Geodatabase Basics:

Feature Classes

A

Spatial data

19
Q

Geodatabase Basics:

Feature datasets

A

Containers for feature classes (multiple)

20
Q

Geodatabase Basics:

Relationship classes

A

Link tables

21
Q

Geodatabase tables

A
  • Collection of attribute rows and columns

- No spatial component

22
Q

Personal geodatabase

A

single user

23
Q

File geodatabase

A

multipule users

24
Q

Feature Classes

A
  • Tables that store geometry
  • Point, line & Polygon (Vectors)
  • Similar to shapefiles except shapefiles are not nearly as powerful/useful
  • Shapefile can’t integrate or perform complex operations
25
Q

Feature datasets

A
  • Store feature classes
  • Stand-alone at database level
  • Contained inside a feature dataset
  • Container for feature classes that have topological relationship and same spatial reference (a pure shape file can’t do topological stuff)
  • Efficient organizing and geoprocessing
  • ability to change the spatial reference for all feature classes in that dataset at once
26
Q

Using relationship classes

A
  • Related tables display separately
  • Can fetid quirky, symbolize or label related attributes
  • Can have behaviour rules
  • Referential integrity
  • If a relationship class has an error, then everything will have an error
  • Powerful tool but can be improperly used
27
Q

Referential integrity in a relationship class

A

Minimizes errors

- if relationship classes have an error, then everything will have an error

28
Q

Behaviour rules in a relationship class

A

The system will flag when something you’ve edited/done conflicts with a rule that has been setup

29
Q

What are the benefits of using relationship classes when editing/querying/symbolizing?

A

Can easily/efficiently change values

- Can edit a 3 to a & for all files without having to edit each individual file separately

30
Q

Editing in ArcGIS Geodatabase Model

A
  • Attributes fall within the permissible for the object (can’t place a fish count outside of a stream)
  • Feature can be placed adjacent or connected to a feature only if certain constraints are met
  • Geometry of a feature follows its logical placement
31
Q

Advantages of a Geodatabase

A
  • Optimized storage and access (personal geodatabase is just one file)
  • .mdb?
  • Single & multiple user access (personal vs. file)
  • Individual files have a limit of 1 Tb of storage

GIS Applications Geog 329 (7 decks)

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