SPATIAL DATA - the modes of information stored in a...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
SPATIAL DATA phenomena in the real world can be observed in three modes: spatial, temporal and thematic o the spatial mode deals with variation from place to place o the temporal mode deals with variation from time to time (one slice to another) o the thematic mode deals with variation from one characteristic to another (one layer to another) all measurable or describable properties of the world can be considered to fall into one of these modes - place, time and theme an exhaustive description of all three modes is not possible when observing real-world phenomena we usually hold one mode fixed, vary one in a controlled" manner, and measure"the third (Sinton, 1978) o e.g. using a census of population we could fix a time such as 1990, control for location using census tracts and measure a theme such as the percentage of persons owning automobiles holding geography fixed and varying time gives longitudinal data holding time fixed and varying geography gives cross- sectional data
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: the modes of information stored in a database influence the types of problem solving that can be accomplished Location the spatial mode of information is generally called location Attributes attributes capture the thematic mode by defining different characteristics of objects a table showing the attributes of objects is called an attribute table o each object corresponds to a row of the table o each characteristic or theme corresponds to a column of the table o thus the table shows the thematic and some of the spatial modes Time the temporal mode can be captured in several ways o by specifying the interval of time over which an object exists o by capturing information at certain points in time o by specifying the rates of movement of objects depending on how the temporal mode is captured, it may be included in a single attribute table, or be represented by series of attribute tables on the same objects through time...
View Full Document

Page1 / 2

SPATIAL DATA - the modes of information stored in a...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online