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MONUMENTS. LANDSCAPE. MonumentID Mnumber Name Type Datum Easting Northing Elevation LandscapeID HardscapeID BuildingID MSLINK MAPID. LandscapeID Type Easting Northing BuildingID MSLINK MAPID. There is a geometry error (undershoot) in the corner of the building. HARDSCAPE.

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MONUMENTS

LANDSCAPE

MonumentID

Mnumber

Name

Type

Datum

Easting

Northing

Elevation

LandscapeID

HardscapeID

BuildingID

MSLINK

MAPID

LandscapeID

Type

Easting

Northing

BuildingID

MSLINK

MAPID

There is a geometry error (undershoot) in the corner of the building

HARDSCAPE

HardscapeID

Type

Name

Length

Width

Easting

Northing

BuildingID

ParkingID

MSLINK

MAPID

1. The topology cleanup tool finds the undershoot

BUILDING_INFO

BuildingInfoID

Bnumber

Bname

Type

Bmanager

Bmanager_dept

Bdivision

Blocation

Mgr_Division

Mgr_Assistant

Asst_Division

Comments

MSLINK

MAPID

PARKING

ParkingID

PLname

Type

Row

Easting

Northing

BuildingID

MSLINK

MAPID

2. Repairs the undershoot

UTILITES

UtilityID

Type

Easting

Northing

BuildingID

MSLINK

MAPID

Evaluating MicroStation GeoGraphics GIS

Miho Matias, Brian Fuss, Catherine LeCocq

Alignment Engineering Group, Stanford Linear Accelerator Center

The Alignment Engineering Group has been evaluating the capabilities of the MicroStation/GeoGraphics package for the creation of a specialized GIS (Geographic Information System) at SLAC. The GeoGraphics package offers high precision in a CAD environment compatible with existing SLAC drawings. The GIS is being studied for future use to organize and maintain site-wide geometric data ranging from large structures such as buildings to smaller physics components. This poster summarizes the effort currently focusing on the inner loop road of SLAC where six general categories have been defined.

Coordinate System

Datum: NAD83

Projection: CCS83, Zone 3

Unit: Meter

The SLAC Loop Road

The SLAC loop road map was drawn from GPS and Total Station survey data in the MicroStation CAD system. Based on the CAD data, geographic features were built into the GeoGraphics GIS system. These features were linked using associated database tables which have attributes specific to each object.

Orthophotos created in 2001 Scale: ~1:3500

The Six General Category MicroStation/GeoGraphics Design Files

In this evaluation of the GIS, six general categories of map have been created: buildings, hardscape, monuments, parking, landscape, and utilities. These categories correspond to a unique CAD file where each represents a specific theme of interest to the SLAC community.

Entity Diagram

Shows relationships of tables in the database

1

1

BUILDINGS

1

1

BuildingID

Bnumber

Easting

Northing

Area

Perimeter

BuildingInfoID

MSLINK

MAPID

1

Topology Cleanup

3. After topology cleanup, the data is ready for GIS analyses.

Before features can be defined and later linked to attribute tables in a relational database, the CAD drawings need to be cleaned up. This means correcting or changing CAD elements so that they will be compatible with feature assignments. For example, unconnected line fragments need to be connected, similar line work removed or in the above example, empty space between elements eliminated.

*BUILDING_INFO table is non-graphic attribute data

Prepared using support of U.S. Department of Energy under Contract No. DE-AC02-76SF00515 by the Stanford Linear Accelerator Center, Stanford, California

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