Critical Step 1.1.2: Scalable models based on an integrated geospatial platform

Project team: 

Lead: David Hamilton

Moritz Lehmann, Chris McBride, Piet Verburg

Project description:

This critical step involves the development of a platform ("Takiwa Lakes") to provide information on the 3,800 New Zealand lakes of area greater than 1 hectare. The platform is geospatially referenced so that users can visualise data for individual lakes or for lakes across regions or the whole of New Zealand. We have partnered with an information technology company, Waiora Pacific, who are developing code to support the extensive data handling and visualisation requirements in Takiwa Lakes. Some of the information contained within Takiwa Lakes includes:

  • Lake morphology relating to the area, depth and volume of lakes.

  • High-frequency lake sensor data in a small number of lakes (approximately 15) where lake monitoring buoys have been deployed.

  • Geospatial layers or maps derived from national databases, including aerial photos, land uses, stream networks and soil types.

  • A national risk map of potential invasive fish incursions and establishment.

  • Key remote sensing parameters (clarity, etc.) across all lakes.

  • Catchment nutrient loads for each lake.

  • Predicted nitrogen, phosphorus and chlorophyll concentrations using load models.

  • A database ("LERNZbB") that provides geospatially referenced raw data files.

Links to other critical steps:

CS1.1.1 (Applying time-series models to evaluate impacts of variability in contaminant delivery): catchment nutrient loads for visualisation and for input to the models that predict nitrogen, phosphorus and chlorophyll concentrations for individual lakes.

CS1.1.3 (Geospatial platform to support mana whenua restoration of lakes): this critical step essentially uses the same geospatial platform, Takiwa Lakes, for display of mana whenua information.

CS1.2.1 (Improving real-time high-frequency in-lake monitoring technologies): display of high-frequency lake buoy data was one of the original drivers for setting up Takiwa Lakes and these data are being displayed as a component of the platform.

CS1.2.2 (Ground-truthing new remote sensing technologies): the visualisation platform of Takiwa lakes is ideal for displaying remote sensing generated as a part of CS1.2.2.

CS1.3.4 (Prioritising lakes and interventions for management action): Access to comprehensive databases as well as modelling tools for prediction of lake trophic state provide the basis for prioritising lakes for management actions.

Action partnerships:

  • This Critical Step relies heavily on the ability to access data from a range of organisations. We have relationships with MfE and DOC which allow access to national databases, with other research organisations that also provides for access to national databases (e.g., Landcare Research: Land Cover Data Base) and with local and regional councils.

Current work:

Key sites:

All NZ lakes.


Conference Presentations

  • Hamilton D, McBride C, Lehmann M, Tempero G, Taitoko M, Ullrich T, Burnie S. 2017. Modelling of trophic state of New Zealand lakes and visualisation with the geospatial platform Takiwa. Oral presentation, 5th Biennial Symposium of the International Society for River Science: Integrating Multiple Aquatic Values. Hamilton, New Zealand. 19-24 November 2017.

  • Hamilton D, Lehmann M,  McBride C, Taitoko M, Burnie S, Ullrich T (2016). Advances in 'Takiwa'; a geospatial platform and information repository for New Zealand lakes. Poster presentation at the New Zealand Freshwater Sciences Society Annual Meeting, Invercargill, 5-8 December 2016.