Slide 1 SDTSSDTS FGDC CWG 09-02-30031 SDTS Revision Project ANSI INCITS L1 Project to Update SDTS...

FGDC CWG 09-02-3003 1Slide 1

SDTS

SDTS Revision Project

ANSI INCITS L1 Project to Update SDTS

FGDC CWG

September 2, 2003


SDTS

SDTS Revision

Spatial Data Transfer Standard• Background/History

• Philosophy

• Model Levels

• Content

• Implementation


SDTS

SDTS Revision

Requirements for Change–Technology Evolution–Standards Evolution

• Role of SDTS• Revision scope• Candidate updates• Plans


SDTS

Background/History

• NCDCDS & FICCDC – 1980s

• NIST FIPSPUB 173-1 – 1994

• ANSI NCITS 320-1998

• INCITS L1–InterNational Committee for Information

Technology Standards

–L1 Geographic Information Systems


SDTS

SDTS Philosophy

• Self-documenting

• Complete - containing everything needed to enable informed use

• Includes metadata (reference system, data dictionary, data quality information, etc.)

• Information for software and users to read

• Abstract model based Implementation

• Modular


SDTS

Model Levels

• Conceptual [defns]– The philosophy, ideas, concepts and

definitions that form the basis and set the perspective

• Logical [modules]– give substantive shape to the ideas from the

conceptual layer

• Format [files]– Using the structures to build the end

product: “a set of files for data transfer”


SDTS

Content

What is the content of a transfer?

• Features & Spatial Objects– Vector: point, node, chain, polygon, string,

arc, link

– Raster: grid, pixel

• Attributes– user-defined

– standard list


SDTS

Content (2)

• Metadata–Data dictionary, spatial referencing,

data quality, symbology tables, security, global information

• Graphics

• Ancillary information

SDTS Module Categories

IdentificationCatalog

/Directory/Cross Ref/Spatial Domain

SecurityCodingSpatial Reference

InternalExternalRegistrationSpatial Domain

Data Dictionary/Definition/Domain/Schema

Transfer Statistics

LineagePositional AccuracyAttribute AccuracyLogical ConsistencyCompleteness

Vector:Point-NodeLineArcRingPolygon

Raster:Raster DefinitionLayer DefinitionDimension DefinitionCell

Composite

Text RepresentationLine RepresentationSymbol RepresentationArea Fill RepresentationColor IndexFont Index

Attribute PrimaryAttribute Secondary

DATA QUALITY

SPATIAL OBJECT

GRAPHICREPRESENTATION

ATTRIBUTE

GLOBAL


SDTS

SDTS Profiles


SDTS

Requirements for Change

• Technology Evolution–DCEs, etc.

• Standards Evolution– ISO TC 211 standards

–OpenGIS Consortiuum specifications

–W3C, Etc.


SDTS

Current SDTS Paradigm:Static Data Transfer

Manifest

catalogsschemacoord system...

Dataset

spatial objectsattributescomposites...

Encode from source

Decode to target app

Data Transfer


SDTS

Dynamic Interoperability

Database Server

catalogsschemacoord systemgeodata

Database Client

schemacoord systemrepresentationgeodata

Distributed computing environment

Requests, Features, & Collections


SDTS

SDTS Role

• SDTS is especially suited for–Blind exchange

–Archive

• the information content requirements necessitate –self-contained and

–self-describing datasets.


SDTS

Setting Revision Scope

1. Action item to INCITS L1 membership: Review SDTS to identify recent work that has been done that would affect the rewrite of the document, i.e., better/newer concepts, and technologies identified in more recent standards.

2. Select target constructs to which to map current SDTS constructs.

3. Select target enhancements (e.g. enhanced semantic modeling).


SDTS

Candidate Mappings

• SDTS Constructs map to targets

–Abstract (Conceptual) Model» bring into alignment w/ ISO TC 211

19100 suite of standards

– Implementation» bring into alignment with ISO TC 211 &

OGC specifications • Logical

• Encoding


SDTS

Abstract Model Mappings

• Conceptual Model ISO 191xx– Feature model

» Entity vs Representation 19109 …

» Entity Attribute model 19110 (and beyond?)

– Spatial Object model

» Vector 19107

» Raster 19123

– Graphic representation 19117


SDTS

Logical Components

• SDTS Logical constructs ISO 191xx– Global components

» Metadata 19115

» Data Dictionary 19010 (+?)

» Spatial Referencing 19111


SDTS

Implementation - Encodings

• Current SDTS encoding: – ISO 8211, Data Descriptive File

• Replace ISO 8211 encoding with – XML, specifically GML (Geography Markup Language,

OGC and ISO 19136 specification), and

– ISO 19115 metadata encodings.

• Replace Graphic Symbology with OGC Style Layer Descriptors?


SDTS

Revision Project, Next Steps

1. Scope the project

2. Develop work plan

3. Enlist resources


SDTS

SDTS Revision Contact

Robin Fegeas

[email protected]

703-648-4511

Slide 1 SDTSSDTS FGDC CWG 09-02-30031 SDTS Revision Project ANSI INCITS L1 Project to Update SDTS...

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