In addition to ordinary image tabs, JustMeasure can create a georeferenced cadastral tab from Czech ČÚZK data. The feature is available in Basic, Trial and PRO.

Identify a property by address

  1. Click Property in the top bar.
  2. Enter an address and choose Search RÚIAN.
  3. Select the matching address point.
  4. JustMeasure fills in the municipality, cadastral area, related parcel or parcels and, when the KN service is available, the title sheet (LV).
  5. Choose Save to project.

The identification data is stored in the .justm project.

Select a property on the map

If you do not want to search by address, or the object has no address point, choose Property → Select on map.

  1. Search for a municipality or cadastral area.
  2. Zoom to the required location.
  3. Click a building or parcel.
  4. Choose Use selected object.

This also works for buildings without a house or registration number. In that case JustMeasure shows No address point and works with the building, parcel and cadastral-area identifiers.

Cadastral tab

After identifying a property, choose Load cadastral map. JustMeasure creates a separate cadastral tab containing vector geometry for parcels and buildings.

The cadastral source is georeferenced in S-JTSK / EPSG:5514, with one coordinate unit equal to one metre. The cadastral tab therefore does not require calibration. Raster-correction tools are not used on this tab.

Downloaded vector geometry is stored in the .justm project as a snapshot of the data. The project therefore preserves the cadastral geometry that was used when it was saved.

Cadastre, orthophoto and layers

The cadastral tab offers three background modes:

  • Cadastre – vector cadastral geometry only,
  • Orthophoto – ČÚZK aerial imagery,
  • Orthophoto + KN – aerial imagery with the vector cadastral drawing over it.

You can adjust Orthophoto opacity and independently show or hide the Parcels and Buildings layers.

Note: Orthophoto imagery is loaded online and is not embedded in .justm. Vector cadastral geometry stored in the project remains available without reloading the orthophoto.

Snapping to cadastral geometry

The Snap to cadastral geometry option snaps measurement points to parcel and building vertices and edges. A vertex has priority over an edge.

Visually hiding the Parcels or Buildings layer does not disable its snapping geometry. To disable snapping, switch off Snap to cadastral geometry itself.

Convert a parcel or building to an area measurement

With the Select tool, click a parcel or building. Information about the selected feature and the Convert to area button appears in the left panel.

JustMeasure creates a normal editable area measurement. It can then be edited, renamed, moved to a measurement group, hidden or deleted just like an area traced manually.

Parcels with one or more interior holes are supported. A common example is a parcel surrounding another parcel containing a house. Interior areas are automatically subtracted from the resulting area, while their boundaries are included in the perimeter.

For unusual geometries consisting of several separate outer parts or deeply nested polygon structures, automatic conversion may reject the geometry. In that case, trace the object accurately using cadastral snapping.

PDF report

When a project contains property identification, the PDF report can include the address or no-address indication, municipality, cadastral area, parcel or parcels and title sheet (LV) for selected tabs. For a cadastral tab, the drawing in the report also respects the currently selected map background and measurements.

Accuracy of cadastral data

A cadastral tab does not require user calibration, so there is no additional error from manually setting the image scale. Measurement accuracy is still limited by the accuracy of the source geometry supplied by ČÚZK.

A cadastral map is not a substitute for a land survey and should not be used as the sole basis for legally determining a property boundary. For work where the exact boundary position is critical, use appropriate surveying or authoritative documentation.

Connectivity and data

Address and area searches use public RÚIAN ČÚZK services. To retrieve KN information, the identifier of the selected address point, building or parcel is sent through the JustMeasure licensing backend to the official ČÚZK KN REST API. Drawings, photographs and the complete project are not uploaded to the JustMeasure server for this feature.