LandXML FAQs

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What is the maximum LandXML extract file size?

The original constraint of 2mb for a LandXML file was set almost a decade ago when email limits, system performance and internet speeds were significantly lower than they are today.

We have therefore increased the LandXML extract file size to 20mb. The maximum number of objects that are allowed to be extracted has also increased to 200,000. We strongly recommend that customers performing LandXML extracts always select ‘Now’ as the Delivery Option.  This option downloads the file direct from Landonline to the local PC, avoiding email file size limitations. Surveyors can contact LINZ Customer Support to request a temporary file size increase if an extremely large extract is required.

Does Landonline allow data to be extracted in Old Cadastral Datum (OCD) coordinates?

Landonline does not allow data to be extracted in Old Cadastral Datum (OCD) coordinates; nor can Landonline import LandXML files with an OCD coordinate system.

 

What Survey Software checks should I make before saving to LandXML?

Before saving the LandXML file in your survey software, and before importing the LandXML file into Landonline, you need to ensure that:

  • The parcel areas have been rounded to the nearest 1m2 (0.0001 Ha). XML allows the area of each parcel to display to less than 1m2 while LINZ requires areas to the nearest 1m2 (0.0001Ha).
  • All the arc information is correct, especially the arc length. Some survey software calculates the arc length, which may be different by 0.01m to the arc length in Landonline.
  • Check that the LandXML attribute 'lengthAdoptionFactor' (which may just be called 'Length Correction' in survey software) has a value of '1' and is shown lengthAdoptionFactor=’1’

What about editing in Landonline after a LandXML file has been imported?

All imported LandXML files still require edits to be made in Landonline to the e-survey once imported. The amount of editing will depend on the:

  • Survey software used to create the LandXML file.
  • Pre-validation report failures.
  • Survey purpose of the e-survey.

Ensure all the following screens have been opened and checked for completeness:

  • Survey Header.
  • Spatial Window.
  • Mark List.
  • Mark Details.
  • Vector Capture.
  • Parcel List.
  • Parcel Details.

 

How do I name new Marks in Landonline?

Mark names in Landonline for new marks should be made up of three components:

  • Mark type abbreviation e.g. PEG, IT, LP, UNMK.
  • Mark number, e.g. 1, 2, (preferably alpha numeric instead of roman).
  • Mark plan reference, e.g. DP 523456.

The LandXML schema requires mark names to be unique even if Landonline does not have unique mark names. Landonline cannot import an XML file with non-unique mark names. Therefore in your survey software, the marks should be made unique.

 

Do I need to include Bearing corrections?

Yes. Please ensure all Referenced Surveys have Bearing Corrections entered against them even if the bearing correction is 0.00000.

 

What about Parcel mappings?

Some LandXML Parcel Classes do not map the Parcel Intent and Topology Class. The LandXML schema does not cater for every field in Landonline, nor does it cater for every field to be mapped. Where there is more than one import value for a schema value, Landonline will not map it. This requires you to make a conscious choice in Landonline.

You need to enter the parcel details in Landonline and update the observations associated with the parcel in the Observation Layers in the Vector Capture screen. The updated parcels will require linking to the spatial representation.

 

What happens if LandXML files fail to import due to parcel topology problems?

If there are parcel topology errors, Landonline cannot import the LandXML file.

To identify if the parcel topology problems are caused by the new survey or the underlying Landonline data the survey must be visible in Landonline.

To get the survey into Landonline, unlink the marks in your survey software and create a new LandXML file. Import this file into Landonline. If the problem is with the Landonline data, you should enter the exception process and request LINZ to amend Landonline.

When the data is corrected you have two options:

  • Continue in Landonline and re-link the marks in Landonline, or
  • Extract the corrected Landonline data and read this into your survey software, unlink and re-link the marks and create a new LandXML file, then import this file into Landonline.

Preferably, any anomalies in the Landonline data should be identified and corrected before the LandXML file is created and imported into Landonline.