GIS Spatial Analysis

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Questions and Answers

What is the primary function of GIS?

  • To display spatial data in a map format
  • To enable the analysis of spatial data and their attributes for decision support (correct)
  • To perform mathematical operations on spatial data
  • To collect and store spatial data

What is the purpose of reclassification in spatial analysis?

  • To overlay more than two layers
  • To rebuild the spatial data and the topology
  • To retrieve attribute data without altering the existing data
  • To reclassify attribute data by dissolving a part of the boundaries and merging into new reclassified polygons (correct)

What is the type of operator used in the conditional statement in a query?

  • Algebraic
  • Arithmetic
  • Relational (correct)
  • Logical

What is the purpose of the SELECT clause in a query?

<p>To specify the attribute name(s) to be retrieved (D)</p> Signup and view all the answers

What is the result of overlaying more than two layers in spatial analysis?

<p>Rebuilt topology of the merged points, lines, and polygons (B)</p> Signup and view all the answers

What is the primary purpose of connectivity analysis?

<p>To analyze the connectivity between points, lines, and polygon (D)</p> Signup and view all the answers

What is the main objective of spatial analysis in GIS?

<p>To analyze the locations, attributes, and relationships of features (B)</p> Signup and view all the answers

Which of the following is an example of a relational operator used in a query?

<p>All of the above (D)</p> Signup and view all the answers

What is the outcome of the Coverage Rebuilding process in spatial analysis?

<p>Rebuilding of the spatial data and the topology (A)</p> Signup and view all the answers

What is the purpose of the FROM clause in a query?

<p>To specify the table (B)</p> Signup and view all the answers

What is the primary function of a query in spatial analysis?

<p>To retrieve attribute data without altering the existing data (A)</p> Signup and view all the answers

What is the main application of overlaying more than two layers in spatial analysis?

<p>All of the above (D)</p> Signup and view all the answers

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Study Notes

GIS Function and Spatial Analysis

  • The primary function of GIS is to enable spatial data analysis and its attributes for decision support.
  • Spatial analysis involves examining locations, attributes, and relationships of features in spatial data using overlay and other analytical techniques to address a question or gain useful knowledge.

Spatial Analysis Categories

  • Query: retrieval of attribute data without altering the existing data through arithmetic and logical operations.
  • Reclassification: reclassification of attribute data by dissolving a part of the boundaries and merging into new reclassified polygons.
  • Coverage Rebuilding: rebuilding of spatial data and topology by "update", "erase", "clip", "split", "join", or "append" operations.
  • Overlay: overlaying of more than two layers, including rebuilding topology of merged points, lines, and polygons, and operations on merged attributes for suitability studies, risk management, and potential evaluation.
  • Connectivity Analysis: analysis of connectivity between points, lines, and polygons in terms of distance, area, travel time, and optimum paths.

Query Specifications

  • A query is used to retrieve attribute data without altering the existing data according to specifications given by the operator.
  • The specifications include three items:
    • SELECT: attribute name(s)
    • FROM: table
    • WHERE: condition statement
  • The conditional statement is represented by three types of operators:
    • Relational: >, <, =, etc.
    • Logical: AND, OR, NOT, etc.
    • Arithmetic: +, -, *, /, etc.

GIS Function and Spatial Analysis

  • The primary function of GIS is to enable spatial data analysis and its attributes for decision support.
  • Spatial analysis involves examining locations, attributes, and relationships of features in spatial data using overlay and other analytical techniques to address a question or gain useful knowledge.

Spatial Analysis Categories

  • Query: retrieval of attribute data without altering the existing data through arithmetic and logical operations.
  • Reclassification: reclassification of attribute data by dissolving a part of the boundaries and merging into new reclassified polygons.
  • Coverage Rebuilding: rebuilding of spatial data and topology by "update", "erase", "clip", "split", "join", or "append" operations.
  • Overlay: overlaying of more than two layers, including rebuilding topology of merged points, lines, and polygons, and operations on merged attributes for suitability studies, risk management, and potential evaluation.
  • Connectivity Analysis: analysis of connectivity between points, lines, and polygons in terms of distance, area, travel time, and optimum paths.

Query Specifications

  • A query is used to retrieve attribute data without altering the existing data according to specifications given by the operator.
  • The specifications include three items:
    • SELECT: attribute name(s)
    • FROM: table
    • WHERE: condition statement
  • The conditional statement is represented by three types of operators:
    • Relational: >, <, =, etc.
    • Logical: AND, OR, NOT, etc.
    • Arithmetic: +, -, *, /, etc.

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