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Methods of representing geographic space

Explore methods of representing geographic space through Raster and Vector models, understanding the advantages and disadvantages of each. Learn how spatial features are portrayed and how geographies make decisions when entering data into GIS.

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Methods of representing geographic space

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  1. Methods of representing geographic space Raster Model Vector Model

  2. Map as an Abstraction of space: • Spatial features can be represented as points, lines and area(polygons). • Some objects are selected for inclusion and another not spatial feature and it have attributes as 1- simplified 2-aggregated 3- classified. • When the geographies want to enter the data to GIS, they have some decision need to made based upon to can entered it to computer.

  3. The definition: • Raster Models: It is that features made of cells and each cells related with another cells. • Vector Models: It is that features included points, lines and polygons and their data is spaghetti.

  4. Vector Models • It is represent by (x , y) coordinates. • Vector model take less storage. • Example for vector model is digitization. • We take long time when make vector model.

  5. Raster models • It is represent by (pixel or cell) • It is take more storage. • Example for raster model is scanning. • We take short time when make Raster model.

  6. Geographic Representations • CELLS: a representation of geographic data on rows and columns . • PIXELS: a group of points with a color value but no data related to others

  7. Raster and vector representation • Raster representation Vectorrepresentation

  8. Continue

  9. RasterData: Advantages and Disadvantages

  10. VectorData: Advantages and Disadvantages

  11. Grid data (cells)

  12. Satellite image (pixels)

  13. Vector Vs. Raster

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