ATTRIBUTE DATA MODELS
A separate data model is used to store and maintain attribute data for GIS software.
Looking at all your GIS attribute data along side one another can be very helpful when determining the proper way to join them together.
Relational Database Model & Attribute Data Structures
Overview:
Relational Databases
Types of Tables in ArcGIS
Tabular Operations in ArcGIS ...
Attribute data are descriptions, measurements, and/or classifications of the geographic features. Attribute data can be classified into 4 levels of measurement: nominal, ordinal, interval and ratio.
Attribute data: Data that relate to a specific, precisely defined location. The data are often statistical but may be text, images or multimedia. These are linked in the GIS to spatial data that define the location.
ATTRIBUTE DATA FUNCTIONS
INTEGRATED ANALYSIS OF SPATIAL AND ATTRIBUTE DATA
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attribute data - Characteristic or descriptive information about a geographic feature (points, lines, or areas) stored in either tabular format or relational format.
3.7 Attribute Data - Information about the spatial features you have recorded ...
Attribute data
Geographic features
Satellite and aerial images (raster data)
CAD data
Surface modeling or 3D data
Utility and transportation systems
GPS coordinates
Survey measurements ...
attribute data
Tabular or textual data describing the geographic characteristics of features.
ATTRIBUTE DATA ENTRY
Source Documents
There are a number of source documents which can be utilized as data for the attribute database.
Merging attribute data with spatial information has been a central issue in GIS applications.
Organising attribute data
GIS use raster and vector representations to model earth features or phenomena. Apart from the l locations, GIS must also record information about them.
ArcInfo coverages and grids use a georelational data model, a hybrid data model that combines spatial data (in coverages or grids) and attribute data (in tables). Other data models used in ArcInfo include tins, images, and grid.
These early records followed the two element structure of modern geographic information systems: a graphic file linked to an attribute data base.
as commercial vendors of GIS software, successfully incorporating many of the CGIS features, combining the first generation approach to separation of spatial and attribute information with a second generation approach to organizing attribute data ...
ascii for input from a text file containing coordinate and attribute data, and v.in.db for input from a database containing coordinate and attribute data. With v.
Organizing Attribute Data (Foote and Huebner/Geographer's Craft) -- Flat files and spreadsheets, hierarchical files, relational files. Overview of Database Design (ESRI) -- What influences dbase design?; what needs to be designed?
- Spatially reference data or geographic data (geospatial data, attribute data, metadata)
- Geospatial data:
o Characteristics of spatial data (mappable, discrete or continuous, spatial relationships) ...
Loading attribute data from flat files into GIS format
Reformatting Area Master Files from Packed Decimal a format interpretable by the workstation GIS
Creating an 'address match' coverage ...
Aronoff (1989) described four major GIS analysis capabilities: (1) maintenance and analysis of spatial data, (2) maintenance and analysis of attribute data, (3) integrated analysis of spatial and attribute data, and (4) output formatting.
To find different items in attribute data, the programmer can set a variable which allows the user to select one of the several items in HTML document.
Tables - A Table is a collection of attribute data, typically linked to spatial features in a Theme.
Charts - A Chart is a graphic representation of attribute data in a Table. A Chart can be dynamically linked to both a View and a Table.
[data analysis] A technique in which attribute data that is organized by a large or arbitrary area unit is more accurately distributed within that unit by the overlay of geographic boundaries that exclude, restrict, ...
The street centerline attribute data may be incorrect for the address range, street name or ZIP code.
A street may be "flipped" so the address is placed on the wrong side or at the opposite end of the street.
Bentley PowerMap Field supports disconnected use when access to the attribute database is simply not an option. Database attributes are extracted from the database and maintained as XML within the DGN file.
SSURGO is linked to a Map Unit Interpretations Record (MUIR) attribute data base. The attribute data base gives the proportionate extent of the component soils and their properties for each map unit.
Example 4: Create shapes from attribute data
Frequently, people gather geographic in numerical form. A GPS receiver, for example, gathers sequences of point coordinates.
Feature attribute tables - Relational tables used to store attribute data associated with graphics data in a geographic database.
A new database model that links soil-landscape components on the SLC map to soil attribute data bases.
Separate soil-landscape and base map layers which allow for easier maintenance and update of data.
- data structures for attribute data: flat file, inverted list, hierarchical, network, relational
Restructure
- a commonly performed operation could be very time consuming (e.g. tiger file to arc/info format) ...
The accuracy or reliability of attribute data within the limits described by feature completeness. If attribute accuracy information is not available in the above form, a description of known attribute accuracy characteristics may be substituted.
Shapefiles are ArcView's native file format for geographic features and attribute data.
Geographic Information System (GIS): A GIS is a computer system designed to allow users to collect, manage, and analyze large volumes of spatially referenced and associated attribute data.
A Shapefile is used to store information about the location of objects as well as information or attribute data that relates to each object.
Tabular and attribute data are non-spatial but can be linked to location.
Conventional GIS software extended these procedures to the digital map and linked map features to attribute data. Advanced analytical tools provide entirely new ways to address complex spatial relationships and model alternative management actions.
Individual files directly or indirectly related to geographic datasets (map layers) which store attribute data.
Metadata
Documentation explaining the characteristics of a dataset ...
(9). What is a GIS? What type of activities are carried out on these computerized systems? Describe the difference between element and attribute data.
Created by Dr. Michael Pidwirny, University of British Columbia Okanagan
Made with a Mac ...
In this document we use GIS database to refer to the part of the GIS dataset that contains user editable GIS feature attribute data.
Coverages: One of a series of data themes, such as wetlands or water lines, in a geographic information system with graphic and attribute data related to that topic.
edit
To correct errors within, or modify, a computer file, a geographic data set, or a tabular file containing attribute data.
Associated with the animal drawings are track lines and tallies thought to depict migration routes. These early records followed the two-element structure of modern geographic information systems: a graphic file linked to an attribute database.
asynchronous Calling application does not require immediate response to request before proceeding attribute data Source: OpenGIS Guide Descriptive information about features or elements of a database.
 See also: Attribute, GIS, Information, Database, Geographic
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