Surveys · 4 min read
Surveys: why the county's online map is not a boundary
Every county in Texas now offers a web map with parcel shapes on it, and those shapes are usually close. Close is not the standard for a boundary. Those polygons are digitised from older records and drawn for tax administration, and nobody signs them as a boundary opinion.
GIS lines, appraisal district polygons and satellite imagery are useful context. A sealed survey by a licensed Texas surveyor is the only boundary evidence you can rely on.
What a survey is
A boundary survey is field work plus record research, ending in a sealed document from a licensed Texas surveyor. It resolves where the corners are by reference to recorded calls, monuments and, where they exist, the physical evidence on the ground.
Different products answer different questions: a boundary survey for ownership lines, an ALTA/NSPS survey for a title-insurance-backed transaction, a topographic survey for design, and an elevation certificate for flood insurance.
Why online maps and imagery are not enough
County GIS layers, appraisal district polygons and aerial imagery are excellent for finding a tract and understanding its context. Their positional accuracy is a different matter, and a fence, a driveway or an outbuilding can sit feet — or in rural areas, tens of feet — off a boundary that the imagery implies.
Imagery also cannot show an easement. A pipeline right-of-way, a utility easement or a road dedication lives in records, not in a photograph.
🔶 Context: Our reports use parcel context and county GIS as screening evidence and label it as such. We never present a map polygon as a legal boundary, and neither should a contract.
What a survey commonly reveals
Encroachments the other way (a neighbour's shed or fence over the line), missing or displaced corners, an old fence that has been treated as the line for decades, acreage materially different from what a deed or advertisement states, and overlapping claims of record.
That is why the survey normally belongs early in the process — before you fence, build, clear, divide, or hand over money on the assumption that the map was right.
Who must confirm the open items
- Licensed Texas surveyor (RPLS) — boundary, ALTA/NSPS, topographic, elevation certificate
- Title company — easements and rights of way that no survey will show on the ground
- Texas attorney — if a survey reveals an encroachment or an overlapping claim
None of these roles is LXVentures. Our reports assemble cited public data and label every open item as requiring professional confirmation — they never substitute for these professionals.
General sources
- — Texas Board of Professional Engineers and Land Surveyors (licensing authority)
- — County clerk recorded plats and field notes
- — County appraisal district GIS (context only — not boundary evidence)
These are general public sources for the background above, not the sources of a report on any one property. A property report lists every source it actually used, with its URL and retrieval time.
Keep reading
Next step: request a Property Intelligence Snapshot
Education gets you the questions. A report answers them for one specific property — verified public data, scored analysis, and the items only a named professional can confirm, all labeled as such.
Research and screening — never an appraisal, legal, tax or investment advice. A report tells you what public data shows and which authority must confirm the rest.