gis and survey maps have completely different purposes

7/29/2019 GIS and Survey Maps Have Completely Different Purposes

1/23

Deceptively SimilarSurvey and GIS Maps

Have Different Purposes

WAURISA 2011

1

Holly Glaser

MappaMundiGIS

Tim Griffin

Tyee Surveyors


2/23

GIS and Surveyors Make Maps,

But thats just Part of the job

2

Maps are the Intersection of GIS and Surveying

Scaled Representation of Features in a Landscape

Coordinate System

Oriented in Space & Time

Title, Author, Source, Legend

| MappaMundiGIS & Tyee Surveyors 5/11/2011


3/23

WA State defines surveying in RCW 18.43

2011-04-213

(9) "Practice of land surveying" means assuming

responsible charge of the surveying of land for the

establishment ofcorners, lines, boundaries, and monuments, the lay

ing out and subdivision of land, the defining and locating of corners, lines,b

oundaries, andmonuments of land after they have been established, the survey of land areas for the purpose ofdetermining the topogra

phy thereof, the making of topographical delineations and thepreparing

ofmaps and accurate records thereof, when the proper performance of such services requires technical knowledge and skill.


4/23

Survey Evidence:

Process,

Research,

Result

Requirements

Practice &

Survey

Records

Surveyors are Part of the Legal System

2011-04-214

WA PLSLicenseBoard

Test/

License

Standards


5/23

GIS Specialist Duties

2011-04-215

To oversee all activities related to the design,

provision, development and maintenance of

the City's geographic information system to

maintain the integrity, security and reliability

of the City's spatial data and to develop and

implement policies and procedures to guidethe operation of the City's GIS program.


6/23

GIS

Experience

ProfessionalTraining & Service

GIS Puts Information In the Place

Where It Belongs

2011-04-216

Software

CertificationsCertifications

GIS

Community

Practice

?


8/23

2011-04-218

Cursed is the.Deuteronomy

} An area inhabited anddefended by anindividual animal or a

breeding group of

animals

} The geographicaldomain under the

jurisdiction of apolitical unit, especiallyof a sovereign state

Place Matters


9/23

The Old Land Boundary Problem

Land: Means of Existence Resources For Survival

2011-04-219

} Survival happens when

people are living in a place

where they can find ormake shelter, gather or

grow food, and live in

peace long enough to raise

a family.} Continuing for

generations.

} Land area resources are

limited.

} Great success brings a

growing population too

large to survive on the old

home turf.

} The growing populationneeds more resources to

support everyone..


10/23

Expanding Territories

2011-04-2110

Success and Boundary

Disputes

Risky

Lethal

Common

Solution:

Survey System

Social Engineering

MeasuringTechnology

Recording Method

Public Trust

Clear BoundariesSafe Records

Accepted Standards

Enforcement


11/23

2011-04-2111

Like two parties with

their measuring rods

arguing over the boundary

stones in a shared field,

contending in that narrow

strip for their rights, so the

battlements divided them.

Homer, the Iliad

Boundary Enforcement

Cursed is he whomoves his neighbours

boundary mark

Deuteronomy 27:17.

"The princes of Judah

have become like those whowould move a boundary. O

n them I will pour out

My Wrath. - Hosea 5:10.


12/23

Accuracy, Error, Measurement,

Datum & Why

GIS Data? I wouldnt use it to set boundaries.

2011-04-2112


13/23

Different Kinds Of Location

2011-04-2113

Geographic Coordinates

} Geometric Model

applied to Earth

PLSS:

Distance less distorted than

Shape or Position

Cant tile a

sphere with

squares


14/23

About Your Data

GIS View of Data Survey View of Data

2011-04-2114

} I dont care who made thedataset. metadata lets me

know if this dataset is OKfor this project.

} Its the analysis that isimportant

} Did I think of all the factors?

Is this what the customerwanted to know. Is this the

best data and bestprocedure? Like the map?

} Research

} Verification

} Prior field work} Deeds

} Before field data collectionbegins all research must becompleted and verified.

} Verify datum, monuments} My professional standing is

related to the quality of dataon maps released under myPLS stamp.


15/23

RULE OF LAW

Evidence ofOwnership

Disputes

Control ofLand

Ownership ofLand

2011-04-2115


16/23

Worst Nightmares of GIS, Survey

GIS Survey

2011-04-2116

} The groundwater is

moving the other way!

} They changed the

standards? When?

} Doing a terrible analysis

with a result that could be

harmful because you were

not careful.

} We worked on the wrong

parcel?

} Didnt read all of the legal

description, just noticed

except for the last 10 ft

from each boundary line

} Started at the wrongmonument


17/23

GIS is general purpose

An Entire System of Geographic Information

2011-04-2117


18/23

Close to the Truth

2011-04-2118

Survey

}All errors from using the

instruments to collect

data have been

corrected as far aspossible. Now I have a

measurement of the

boundary line length.

GIS

Hello function, go to this

segment and tell me

how long it is. Now I

have a measurement ofthe boundary line

length.


19/23

Background

Trainingand

Professional

Experience

Change The

Words We

Use

2011-04-2119

Words have everyday meanings.

Short words are easiest to use andunderstand.

During Training

} Attach new context-specific meaningsto common words.

Gaining Experience} Communicate fluently with other

experts in the field.

} Precise choice of words to improvecommunication.

Result} Communication between experts in

related fields is harder when the samewords are understood differently.


20/23

Sure, I know just what you mean

2011-04-2120

Our Scene

Kickoff Meeting for a Multi-Year Project

ManagerGIS Developer

Project Surveyor

GIS Tech

Database AdministratorHR Observer


21/23

Lets Update the Highway Mileposts

2011-04-2121

Word Surveyor GIS Tech Database

Admin

GIS

Developer

Manager

Direction N,S,E,W

bearings from

data recorded in

a survey

Geometric

direction

of a GIS

segment

Segment

with a From

point and a

To point

Direction of

increasing

measure in

a linear

referencing

system

Compass

directions:

NEWS

(North, East,

West,

South)

Distance Lineal

measurement

Displayed

by right

clicking on

segment

Loop

L = from

to

LL = L + LL

Last

Segment

End Loop

Value of LL

Depends on

the

coordinate

system and

datum

Commute

length

Line Physicalmanifestation of

a distance and

direction,

occurring either

on the ground

or on a map

Linesegment

Linesegments

which are

connected

A linearfeature

A geometrythat has a

length and

no width.


22/23

At the next meeting..

2011-04-2122

} Were those mileposts locationsverified on the ground. Is thedatabase really accurate?

} Should we put out and RFP fornew markers?

} We started to measure but what

line did you want marked? Wewerent sure- is that the centerline?Or the Fogline?

} What about dual carriageways

} Or did you want traffic lanecenterlines?

} The accuracy is not that importantas long as we can locate a car.

} Oops, We need to redo thedistances- they are fromgeographic coordinates but werenot reprojected to State PlaneWest so the highways measurelocations are all wrong.

} We looked at the as builts, is thisthe right datum and is the accuracygood enough for the project?

} I have to make sure the data weare using is right. Its part of thelicense and Im not comfortablewith how you got this data in thefirst place or sure your data isreliable enough to warrant itsaccuracy. I can verify it for you, butthats going to take a real budget.


23/23

Survey Data and Uses

Survey Data Applications Users of Survey Data

2011-04-2123

} Building Structures that

stay up.

} Create Legal Records

} Make Land Use Plans

} Create Maps

} Spatial Analysis Results

} Builders

} Surveyors

} Land Use Planners

} Tax Collectors

} Military Planners} Buyers and Sellers

gis and survey maps have completely different purposes

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