How to create buffer and setback zones for parcels, lines and sites
Buffers make distance rules visible around points, lines and polygons.
Field takeaways
- A buffer is a zone generated at a specified distance around geometry.
- Setback rules come from law or project requirements; the app creates geometry.
- Metric buffers should be interpreted in a suitable projected CRS.
- Point, line and polygon buffers serve different field decisions.
- MapLab Survey can keep buffers as layers and export them.
What a buffer answers
A buffer draws a band at a fixed distance around a point, line or polygon. It answers questions like "what is within 10 metres of this line?", "what remains if I step 5 metres back from this boundary?", "where is the 50-metre safety radius around this point?". It looks simple in GIS terms and seriously raises decision quality in the field.
A buffer is not automatically a setback
Technically, a buffer produces geometry. A setback is a rule — defined by planning regulations, a project, an institution or a safety procedure. MapLab Survey lets you draw and share the distance in the field; the legal validity of the distance comes from the applicable regulation or specification. And measure from the right edge: centreline, bank or legal boundary give three different bands. Determining an official boundary is licensed survey engineering work; the app speeds up the field side and does not replace the side that signs.
Field uses
- A working corridor along a pipeline or cable route.
- Seeing the setback distance inward from a parcel boundary.
- A safety radius or sampling zone around a single point.
- A pre-check band around a stream, road or power line.
- Planning spraying, irrigation or planting strips in agriculture.
The coordinate system caution
A buffer in metres only makes sense in a metre-based coordinate system; thinking "10 metres" in WGS84 degrees needs technical care. Buffers are also horizontal distances — on sloping ground the surface distance is longer, which matters the day the band is staked out.
Share it, then walk it
Send the buffer as KML to another phone, DXF to the CAD office or GeoJSON to a GIS system, with the distance and source geometry in the filename: "stream_buffer_25m_TM36.kml". Then export it as a layer and walk it — seeing where the band actually falls catches the conflicts a plan view hides.
See it in action
MapLab Survey | Professional Mobile GIS, GPS Surveying & Land Measurement App
Visit the YouTube channel ->Try these steps on your own phone.
MapLab Survey handles RTK/GNSS point capture, drawing, area and volume calculations and coordinate conversion, then exports to DXF, KML/KMZ, GeoJSON, Shapefile, GeoPackage, NCZ or CSV. Capture, calculation and export work offline. Live NTRIP corrections and online basemaps need a connection.
Frequently asked questions
What is a buffer?
A zone created at a specified distance around geometry.
Can MapLab Survey draw setbacks?
It can draw the geometry; the rule must come from the project or regulation.
Can buffers be exported?
Yes, to KML/KMZ, DXF or GeoJSON.
Does CRS matter?
Yes, especially for metric distances.
Technical references
The field guidance in this article is aligned with the technical and official references below.
Related: Finding parcel corners · Exporting field data to CAD/GIS · Open DXF on phone · MapLab Survey