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Chapter 5

EATS 3300 chapter 5.docx

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Department
Earth, Space Science and Engineering
Course
ESSE 3600
Professor
Sohn
Semester
Winter

Description
EATS 3300 Chapter 5 Questions Lecture 5 1. List and explain types of vector data models. Types of vector data models are relation-based and object-based. Relation-based vector models are spaghetti data, topology data, and surface model. Object-based vector models are spatial features[objects], properties[attributes], and class and class relations. Spaghetti and topology are relation-based vector models. In spaghetti vectors, line ends don't meet and there is a lack of connections. It stores data in an unstructured way. This model stores the name of every object followed by the coordinates the object is composed of. Every object is described independently of the others. In a spaghetti model, points have umbers, lines are ordered strings of points that are associated with a searchable point identification number, and polygons are stored as closed loops of coordinate pairs. The topology vector model is a field of mathematics that uses diagrams or graphs to study the arrangements of geometric objects and the relationships between objects. Topological relationships are invariant under elastic deformation, without tear or merge. Nodes define the two endpoints of an arc, and then each arc has vertices that compose polygons. The surface model, is when surfaces are represented. Surfaces involve an elevation value(z) in addition to (x,y) values. 2. Define and explain relational based vector models, such as spaghetti data, topology data, and surface data. Please see above. In a spaghetti vector model, the spaghetti structure is usually derived from manual digitizing. It is a simple model that stores data in an unstructured way, it stores the name of every object followed by the coordinates that the object is composed of. Each object is described independently of the others. 3. Please see #1. Vector data consists of points, lines, and polygons. 4. A relational-based vector model is one that whereas an object-based vector model is 5. Please see #1. 6. Common errors in spaghetti vectors are the silver polygon, undershoot, dangling arc, and gap 7. The spaghetti model is simple, easy to understand, and fast for both input and output. It does however, not include SPATIAL relations with adjacent features and objects, this makes it ineffective for modelling and analysis. 8. ESRI's shape model(file) stores the geometry of each feature as a shape that contains the coordinates and links to the attributes. It is a vector data model. 9. Topology is a field of math that uses diagrams or graphs to study the arrangements of geometric objects and the relationships between them. Topology vector model consis
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