Strand 2: Basic Spatial Analysis Function in GIS Flashcards
What is Digimap?
An EDINA service that allows users to view and print maps
What is Mastermap Download?
Allows you to find, select and download Topography and Integrated Transport Network (ITN) data
What is the Topography layer?
A large-scale topographic database that offers the most detailed mapping available from UK
What are the 9 themes of the OS Mastermap Topography layer?
- Admin Boundaries
- Buildings
- Land
- Water
- Rail
- Roads, tracks, paths
- Structures
- Heritage and Antiques
- Terrain and Height
What is the OS Map ITN and what does it include?
Definitive road network dataset includes: Mini Roundabouts, Traffic Calming, Bridge Heights, One way roads, vehicle restriction, vehicle type access and time restrictions
What is Geocoding?
- Assigning X-Y coordinates to ‘something’ such that it can be plotted on a map
- The process of adding geographic information to a file or data base so that its objects can be displayed on a map
How is Geocoding typically shown as on a map?
A point on a map
What is a real world example of geocoding
Tracking phone location
What is Reverse Geocoding?
- Process of back coding of a point location (x,y) to a readable address or place name
- Uses already known x,y to find the nearest readable address
What is a real world example of Reverse geocoding?
- Emergency services
- Business/ Social media e.g Facebook Check-in
What have Geocoding and reverse geocoding enabled?
Geofencing
What can Geofencing be used for?
- Business deals
2. Location reminders
What can GeoConvert do? (UK Data service)
Converts a post-code to an XY coordinate such that it can be plotted
What are the 4 basic spatial analysis methods using MapInfo?
- Measuring lengths, perimeters and areas
- Selection/ Querying
- Buffering
- Map Overlay
What is Map Overlay?
Counting points in one layer with respect to polygons in another layer
What is querying? (Key function in Spatial Analysis)
- A request to select features or records from a data base
- Often written as statement or logical expression
- Associated with buffering
- Uses features in one layer to select features in another
What are the different types of spatial queries?
- Select by location
- Select by attribute
- Interactive
What are the 4 different type of selection tools in MapInfo?
- Marquee
- Radius
- Boundary
- Polygon
Define buffering
Measured distance outward from a line, point or polygon to produce a circular zone or a corridor around a feature.
What is Point-in-Polygon?
Form of map overlay e.g how many hospitals are there within each Local Authority
What is Geofencing?
A virtual perimeter for a real world geographic area
Use of GPS and smartphones to create virtual boundaries
By accessing locations and pinpointing locations, shops can send messages/notifications to users once they’re in the vicinity of a shop to remind them/inform them of certain events/offers
