Topic 08 Flashcards
(18 cards)
methods for advanced processing for locational data
1) methods for geocoding
2) route-based location references
geocoding addresses
geocoding refers to the process of converting a description of location into a geographic coordinates
geocoding engine
third party service or built engine
input data
addresses, typically that must be parsed prior to analysis
geocoding reference database
referencing information
address parsing
address info is broken into fields or elements that make up the full street address
zip or postal code matching
locate to a region or centroid of region define by code
parcel level geocoding
locate by cadastral parcels (property boundaries)
place name geocoding
matches a place to a geographic location stored in a table
reverse geocoding
converts point locations to decriptions
linear referencing
refers to locating relative positions along existing linear features
2 reasons to use linear referencing
1) record events along a route by measuring distance
2) associate multiple sets of attributes to line features without requiring the underlying lines to be split in the database
routes
linear features that have distances embedded inside the dataset
dynamic or versioned data
point events
such as auto collisions, construction sites etc
line events
winter road conditions, road construction zones, road surface condition etc
dynamic segmentation
combining a route with an event table to create new layer of info
benefits of dynamic segmentation
from a database view, it is efficient to separate the geometry of the route
limitations of dynamic segmentation
requires lots of editing and upkeep
