An appraiser consults a geographic information system for parcel boundaries. What limitation applies?
Correct Answer
A) Mapping layers are not a survey of the boundaries
A general GIS parcel layer is a mapped representation, not automatically a boundary survey. Consider its source, accuracy, and limitations rather than treating it as a certified legal boundary determination. Where a discrepancy materially affects the appraisal, seek appropriate legal-description, survey, or other reliable evidence and qualified assistance when necessary. Do not assume a deed text or a plotted line conclusively resolves every boundary conflict.
Why This Is the Correct Answer
Option A is correct because mapping layers are not a survey of the boundaries. A GIS parcel layer is a representation whose source and accuracy must be considered rather than treated as a certified legal boundary determination. Where a discrepancy materially affects the appraisal, the appraiser should seek a legal description, survey or other reliable evidence.
Why the Other Options Are Wrong
Option B: Such systems may not be cited in an appraisal report
Option B says such systems may not be cited in an appraisal report. USPAP allows appraisers to use maps and other information to identify the subject, so GIS sources can be cited with their limitations.
Option C: Mapping data is more accurate than a deed
Option C says mapping data is more accurate than a deed. GIS layers are approximations, and there is no general rule that they are more accurate than a deed's legal description.
Option D: Boundaries shown are certified by the county surveyor
Option D says the boundaries shown are certified by the county surveyor. A general GIS parcel layer is not a certified boundary determination.
A map is not a survey
GIS lines show roughly where a parcel lies; a survey is what measures where the boundary actually is.
How to use: Use this phrase whenever a question treats mapping data as a legal boundary.
Exam Tip
Treat GIS and online maps as helpful but limited sources, not as certified boundary evidence.
Common Mistakes to Avoid
- -Treating a GIS parcel line as a legal boundary
- -Believing GIS data cannot be cited
- -Assuming mapped boundaries are certified by a surveyor
Concept Deep Dive
Analysis
This question tests the limits of GIS parcel data. A general GIS parcel layer is a mapped representation of boundaries, not a boundary survey. The appraiser may use it to help identify the property but should consider its source and accuracy and seek better evidence if a discrepancy matters.
Background Knowledge
Appraisers identify the subject property using inspections, legal descriptions, maps, surveys, sketches and other information. GIS parcel maps are convenient but can be offset or outdated. Boundary disputes or material discrepancies may require a survey or qualified assistance.
Real-World Application
A GIS layer shows a neighbor's driveway crossing the subject lot. The appraiser notes the discrepancy, reviews the legal description and any available survey, and reports the issue rather than relying on the plotted line.
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