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Introduction to ArcInfo (Workstation). Getting started with ArcInfo.

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Presentation on theme: "Introduction to ArcInfo (Workstation). Getting started with ArcInfo."— Presentation transcript:

1 Introduction to ArcInfo (Workstation)

2 Getting started with ArcInfo

3 ArcInfo subsystems

4 ArcInfo data types Supported formats VectorRaster Coverage Map Library ArcStorm Library TIN Shapefile SDE Layer DXF File Grid Image

5 The coverage Basic unit for vector data Can be point, line, polygon Or region

6 Linking features and attributes Because every feature has a unique identifier, the uniqueness of each feature is guaranteed even if it shares attributes or spatial coordinates with another feature.

7 The workspace A directory (folder) Used in an ArcInfo session Contains geo datasets and an INFO


9 The geographic database Core of a GIS Completeness Accuracy Spatial data Attribute data

10 Operating ArcInfo Arctools (buttons+menus) –Limited to functions included Command-driven interface –Customized/automated by AML Open Development Environment (ODE) –Visual Basics, C, C++, Delphi, Power Builder

11 ArcInfo Commands Syntax rules <> Required argument {cover}{} optional argument {COVER}Uppercase indicates a KEYWORD {cover}Lowercase substitute the name of an object Choices are separated by vertical bars {POLY|LINE|POINT}For optional argument, first choice is the default #Optional argument place holder *Indicates the input for argument comes from the cursor

12 ArcInfo command example Arc: USAGE CLEAN Usage: CLEAN {out_cover} {dangle_length} {fuzzy_tolerance}{POLY|LINE} Arc: CLEAN STREET STREET2 # # LINE

13 Getting help for ArcInfo Get Usage by typing the command –No argument –Good habit to do that Arc: BUILD Usage: BUILD {POLY|LINE|POINT|NODE|ANNO.subclass } Arc: COMMANDS ….. Arc: COMMANDS B BATCHBUFFERBUILD

14 ARC Macro Language (AML) Use to communicate with the ARC system Full programming capabilities ArcInfo commands + OS commands AML elements: –Directives –Functions –Variables

15 AML directives Instruct AML to perform a specific operation Start with an ampersand (&) Examples: –Arc: &RUN my.aml Executes an AML program –Arc: &MENU Opens an AML menu –Arc: &TERM 9999 Sets the terminal type for AML menus

16 AML functions A function performs text substitution The function name appears in [] A function can return –A number –A character string –A Boolean value Returned value can be used further Arc: BUILD [response Enter the coverage to BUILD] POLY Arc: BUILD [getcov * -line]

17 AML Variables A way to store dynamic information Variable types: –Character strings –Integers –Real numbers –Boolean expressions &SETVAR – to set a variables value Examples: Arc: &SETVAR COV = LANDUSE Arc: &SV COV [response enter cov name:] Arc: BUILD %COV% POLY

18 Summary Subsystems Data formats: raster and vector ArcInfo workspace, INFO directory Commands, ArcTools AML: –directives, –functions, –Variables ArcDoc and Command Usage

19 ArcInfo Data Coverages

20 Topology A mathematical procedure that determines these for geographic features –Spatial properties –Spatial relationships Spatial RelationshipSpatial Property Each arc has a beginning node and an ending node Directionality and length of the arc Arcs connect to other arcs at nodes Connectivity Connected arcs form polygon boundaries Area and perimeter of polygon Arcs have polygons on their left and right sides Adjacency or contiguity

21 Topology-Spatial Property ArcInfo uses the inherent topologic relationships of lines and polygons to provide extensive geographic analysis capabilities.

22 Arc-node topology

23 Polygon-arc topology

24 Coverage features Coverages are either points, lines, or polygons A coverage can be both a line coverage and a polygon coverage Annotation –Descriptive text associated with other geographic features E.g. street names, soil types

25 Feature attribute tables FATs are INFO files Each object is associated with a record in an FAT A coverage may have more than one FAT (e.g. a PAT, AAT, & NAT) Feature Classes Feature Attribute Table Name Description Point.PATPoint Attribute Table Arc.AATArc Attribute Table Node.NATNode Attribute Table Polygon.PATPolygon Attribute Table

26 Records and feature identifiers RECNO – internal record number COVER# - ArcInfo assigned ID COVER-ID – user assigned ID

27 Points

28 Arcs

29 Nodes

30 Polygons

31 Features with subclasses

32 Routes A coverage can contain multiple route systems –Each is a separate subclass –Each is made up of sections –Each section is made up of arcs or portions of arcs

33 Route events Events are located using the routes measure units and the route contains sections that are associated to the arcs which contain the actual coordinate information.

34 Regions Regions contain attribute information but do not contain spatial or coordinate information. Spatial information is determined from the underlying polygons that make up the region.

35 Annotation Is a feature type Does not represent geography of a feature Can be associated with other existing feature types Or as independent of any feature

36 Summary Topology in ArcInfo coverage –Nodes, –points, –lines, –polygons, –regions, –subclasses

37 Exercises Ex1 – Understanding spatial relationships Ex2 – Introduction to GIS functions Ex3 - Use the ArcInfo help system Ex4 - Operate ArcInfo (commands, AML) Ex5 - Operate ArcInfo (ArcTools)

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