exactly defining precision with all accuracyexactly defining precision with all accuracy as viewed...
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Exactly defining Precision with all Accuracy
As viewed by a cadastral mapper
Presented by:
Emilio J. SolanoChief Cadastral Engineer
Mapping & G I S Services
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Exactly defining Precision with all Accuracy
Common DefinitionsDifferencesApplication of conceptWho do we work for?Questions
Main Topics
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Common DefinitionsPrecision:'1(The closeness of a repeated set of
observations of the same quantity to one another.
'2(The number ofSignificant digitsused to store numbers.
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Common DefinitionsSINGLE PRECISION STORAGE:)2.147 x 109 = 5m in a 1,000,000m extent
DOUBLE PRECISION STORAGE:)9.007 x 1015 = >> 1m in a global extent
more or less 0.25m in a 12,760,000m extent
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Common DefinitionsAccuracy: The degree to which a
measured value conforms to true or acceptedvalues.
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Common Definitions
HIGH ACCURACY
HIGH PRECISION
HIGH ACCURACY
LOW PRECISION
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Common Definitions
LOW ACCURACY
HIGH PRECISION
LOW ACCURACY
LOW PRECISION
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Common DefinitionsExact: Capable of accuracy of detail;
very accurate; methodical; correct.Exactitude: The quality of
being exact; precise;accurate.
From Latin exigere:To measure, to determine
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Common DefinitionsAmbiguity: When an object may appropriately
be assigned two or more values for a givenattribute.
Intention:Determination to do a specified thing or act ina planned manner.Anything intended or planned; purpose.An instrument, such as a concept, for knowingand referring to a thing as it exists in themind.
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DifferencesPrecision: It is a measure of exactness
Accuracy: It is a measure of correctness
A
B
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Application of conceptThe best outcome can be obtained by applying
a single concept:
Take the best from the experts Use it to do your jobShare the results
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Application of conceptApproach used by Mapping:
Registered subdivisions / control points Parcels 'tax parcel base(High resolution color orthophotos
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Application of conceptDPW can provide new subdivisions registered to control points
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Application of conceptThe Assessor's assembles the tax
parcel base 'GIS layer(
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Application of conceptA consortium can provide other elements
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Application of concept
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Application of concept
7,490 ft
5,910 ft
3,170 ft
2,230 ft
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Application of concept
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Application of concept
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Application of concept
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Application of conceptNow you have an ACCURATE product:
a TAX PARCEL GEODATABASE
That can be shared by:
DPW - DRP - ROV - FIRE - SHERIFF
And other local agencies
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Application of concept
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Who do we work for?The Office of the ASSESSOR, and
our primary function is to produce Assessor Maps.
We work ATthe Office of the AssessorFOR the TAX PAYERS!!!
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Who do we work for?
The TAX PAYER wants and expects:
FAIR and CORRECT valuations,which comes from us being able to choose
between
PRECISION and ACCURACY
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Who do we work for?ACCOMPLISHMENTS
2,600,000 assessmentsOver one TRILLION dollar roll
99.2% accuracy 'SBE audit(Over 25,000 new parcels mappedAMB pages updated every 2 hrs
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Questions?
Now... THIS is precision!