Elements and Performance Criteria
- Prepare 2-D or 3-D digital elevation model (DEM).
- GIS or CAD environment or surface elevation is designed according to project specifications and organisational requirements.
- Current remote sensing technologies for capturing raw elevation data are investigated.
- Views and layouts are established according to job specifications.
- Spatial computing platforms and software systems are selected and set up for suitability against job specifications according to organisational requirements.
- Create 2-D drawings.
- Availability of suitable data is verified with potential suppliers and constraints are assessed according to job specifications.
- Detailed views and layouts are created using various scales according to job specifications.
- -D drawings are finalised and existing -D model is modified as necessary to meet job specifications.
- Create 3-D model or DEM.
- Surface elevation is modelled by mathematically defined surfaces and by point or line data according to job specifications.
- Products that can be derived from a DEM are determined according to job specifications.
- Entities are created and manipulated in 3-D space according to job specifications.
- DEM is developed with a range of thematic data and profiles generated and draped over model according to project specifications.
- Contour map of area is created by employing procedures appropriate to data format and software according to job specifications.
- Slope map of area is created from gradient and aspect components according to job specifications.
- Shaded relief map of area is created from gradient and relief map representations according to job specifications.
- -D model is finalised and existing -D model modified as necessary to meet job specifications.
- Produce output.
- -D and 3-D outputs are documented according to project specifications and organisational requirements.
- Drawing files and elevation data outputs are saved in appropriate format according to job specifications and organisational requirements.
- Physical properties are extracted to job specifications and slope map of area is used for analytical purposes.