GEOM2001 L5-8
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| Why use data bases | Mapping products
Workflow to assess and manage activities
Provide support for businesses and become integrated with everyday activities
🗑
|
||||
| Queries | select rows in database tables based upon a logical expression and returns results as correct or incorrect
🗑
|
||||
| Relational tables are required to have | No repeating or redundant data
Represent a valid state of the world
Maintain a valid state representation of modelling application
Unique data in each row
🗑
|
||||
| Attribute join | creates a table view (for display and queries) as the combination of 2 tables based upon matching values between fields
🗑
|
||||
| Cardinality | relationship between parcel and owner
one-one - one parcel has 1 owner
one-many - 1 parcel has many owners or many parcels has 1 owner
many-many - many parcels have many owners
🗑
|
||||
| Advantages of raster analysis | oAbility to analyse continuous surface variable eg slopes, density etc
oFlexibility to perform other spatial analysis on proximity, hydrological models, filtering local trends etc i.e. hot spots, travel time to destination
🗑
|
||||
| Local operations | operating on each cell value in layer(s)
🗑
|
||||
| Neighbourhood operations | defined by focal cell and surrounding cells
🗑
|
||||
| Zonal operations | on groups of cells identified by zone
🗑
|
||||
| Global operation | incremental operations on entire raster ie distance, flow descent
🗑
|
||||
| Cost distance | movement through the cell can have friction
🗑
|
||||
| Aggregation (merging) | simplify and summarise data to reveal overall trend
🗑
|
||||
| Disaggregation (splitting) | divide data to analyse data relationships
🗑
|
||||
| 'Dissolve' feature | Output merged by geometry - groups by shape
🗑
|
||||
| Spatial join | query to relate features based on spatial relationships
🗑
|
||||
| Union tool | builds new feature class by combining features and attributes of input feature classes
🗑
|
||||
| Update tool | updates the attributes and geometry of an input feature class or layer by the update feature class or layer they overlap
🗑
|
||||
| Intersect tool | builds new feature class from the intersecting features common in both feature classes
🗑
|
||||
| Clip tool | builds new feature class from input features overlying the clip feature i.e. as a cookie cutter
🗑
|
||||
| Ecological fallacy | Errors due to performing analyses on aggregate data when trying to reach conclusions on individual units
🗑
|
||||
| Solutions to ecological fallacy | minimise spatial variation in data
Dasymetric mapping - uses correlated data to statistically relate disaggregate data
🗑
|
||||
| Sliver polygons | occurs as small slivers along versions of similar boundaries causing overshooting/undershooting on intersections when digitising features
🗑
|
||||
| Solutions for sliver polygons | Use a fuzzy tolerance to make boundaries common
Eliminate tool merges slivers
🗑
|
||||
| Terrain analysis | Deals with properties of topography/terrain
🗑
|
||||
| Digital elevation model | Is a raster model which refers to any digital rep of a topographic surface
🗑
|
||||
| Triangulated Irregular Network | A vector data model to represent the land surface with a series of non-overlapping triangles
🗑
|
||||
| Benefits and disadvantages of DEM | + Faster processing and more efficient
- Less flexible, can't update/add new data
🗑
|
||||
| Benefits and disadvantages of TIN | + Flexible with input data
- Less widely available than raster surface models
🗑
|
||||
| Slope | Change in elevation (a rise) with a change in horizontal position (a run) at a surface location
🗑
|
||||
| Aspect | compass direction that the sloping surface faces at each location
🗑
|
||||
| Vertical profile | Shows change in elevation along a line
🗑
|
||||
| 3D draping | Superimpose data such as satellite imagery, hydro features, land cover, vegetation, roads etc on the perspective view to make it more realistic
🗑
|
||||
| Viewshed | the portion of the land surface that is visible from one or more viewpoints
🗑
|
||||
| Watershed | the upslope area contributing flow to a given location
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
cmw001001
Popular Science sets