Geographical Information System · Unit 6
Raster Data Analysis
Exam-focused notes for Raster Data Analysis (Geographical Information System, BIT355): what the TU syllabus asks and how it has actually been tested, with 3 solved past questions from this unit.
What this unit covers
- Digital Elevation Model
- Triangulated Irregular Network
- Local raster operations
- Focal raster operations
- Raster operation examples
Focal raster operations
What do you understand by Focal Raster Operations? Explain with example. [5]
Focal Raster Operations are image processing techniques that compute output pixel values based on the values of a pixel and its neighboring pixels within a defined window or kernel. The operation is "focal" because it focuses on a local neighborhood around ...
Full solved answer →Local raster operations
What do you understand by Local Raster operations? Explain with example [5]
Local raster operations are image processing techniques that modify each pixel in a raster image based on the values of pixels in a small neighborhood (typically a 3×3, 5×5, or larger window) around that pixel. The operation is applied independently at each...
Full solved answer →Digital Elevation Model
Write short notes on: TIN Write short notes on: DEM [2.5+2.5]
Definition: A TIN is a vector-based representation of a continuous surface composed of non-overlapping triangles with vertices at irregularly distributed sample points. Key Characteristics: - Uses irregularly spaced data points (nodes) rather than a regular...
Full solved answer →Make Unit 6 stick
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