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Uso de QField para mapear aves reproductoras en el Mar de Wadden

Por Benjamin Gnep, Schutzstation Wattenmeer e.V.

29.07.2019

Objetivo y restricciones de campo

The Wadden Sea in Denmark, Germany and The Netherlands is of outstanding importance for many breeding bird species. Annually, the Schutzstation Wattenmeer participates in the Wadden Sea wide trilateral monitoring and assessment program (TMAP) and monitors the number of breeding birds in more than 100 monitoring areas in Schleswig-Holstein / Germany. For a number of species we monitor a significant share of the entire German breeding population.

Sketch of the project and the monitoring areas of Schutzstation Wattenmeer (yellow).
Sketch of the project and the monitoring areas of Schutzstation Wattenmeer (yellow).

Most fieldwork is carried out by annually changing volunteers which usually do not have much experience. Good supervision during the monitoring period in spring is thus very important. At the same time the amount of collected data is a significant bureaucratic challenge.

Hasta 2018 se utilizaban mapas impresos en papel para recopilar los datos en el campo. Las principales desventajas del sistema analógico fueron:

  • la orientación en el campo era bastante difícil sin GPS posicionamiento
  • todos los resultados tenían que ser contados y transferidos a tablas de datos y GIS manualmente, era probable que se produjeran errores de transmisión (alrededor de 18.000 las observaciones se recopilan cada año)
  • los datos solo podían revisarse después del período de seguimiento y las observaciones improbables no se pudieron verificar directamente

For this reason, we have implemented a digital monitoring workflow using the power of QField, the advantages of a cloud storage system and the computational power of R. Most tasks are now fully automatized in R. Via the cloud data from all areas can be accessed and evaluated with daily topicality.

Sketch of the data transmission system. Field observations are logged in QField on a tablet and uploaded into a cloud storage. Data from all areas are accessed and automatically treated by an R script.
Sketch of the data transmission system. Field observations are logged in QField on a tablet and uploaded into a cloud storage. Data from all areas are accessed and automatically treated by an R script.

In spring 2019 we tested our system with seven tablet devices spread over seven of in total 12 different monitoring stations.

Preparación del proyecto

On a desktop computer we set up a QGIS project containing a high-resolution aerial image as background layer for orientation in the field. For the monitoring data we created a custom Geopackage database with predefined dropdown columns and entry restrictions. Additionally, we added predefined walking paths to guide the volunteers and to further standardise our monitoring.

Sketch of the QField Interface. For data entry we used a geopackage file with custom dropdown list and entry restrictions.
Sketch of the QField Interface. For data entry we used a geopackage file with custom dropdown list and entry restrictions.

Logged observations are clearly laid out in QField.
Logged observations are clearly laid out in QField.

We used an additional synchronisation App that automatically uploaded the field data from the tablet to a Google Drive cloud after fieldwork. For data download, automatized backup, data review and export we wrote a R script.

After data was automatically synchronized with the cloud the results from all the different areas can be reviewed via a custom R script.
After data was automatically synchronized with the cloud the results from all the different areas can be reviewed via a custom R script.

Also visual review of the collected data is possible via R.
Also visual review of the collected data is possible via R.

The general concept of QField as a simplified field application of QGIS turned out to be very useful for our work with volunteers. While we can set up a project with a high level of customization including all our needs in QGIS, field workers only need to understand the basics. A big advantage: unwanted changes are almost impossible in QField.

Trabajo de campo

During field work orientation was much easier on the tablets compared to printed paper maps especially in the extensive salt marshes. Data entry was pretty fast thanks to the possibility to automatically reuse the last entered value. Logging observations on the tablet only took a little bit extra time in comparison to paper maps.

The field kit.
The field kit.

The field kit.
The field kit.

Evaluación y futuro

We had no software problems during a testing period in spring 2019 and everything worked as planned. In an evaluation survey all participants stated that they preferred using the tablet rather than the analogue paper maps for field work. The use of the custom QField project was evaluated as straightforward and easy.

In total more than 18.000 data points were collected in the field. Due to automatized data treatment we saved a huge amount of office time and avoided transmission errors. Also, data collected with tablets and GPS-positioning will be of much higher spatial accuracy. In the future we will thus fully switch to tablet based fieldwork.

Reconocimiento

We thank the Ernst-Commentz Stiftung, the Europäischer Tier- und Naturschutz Stiftung and the Adolf und Hildegard Isler Stiftung for generously supporting our project. Additionally, we want to thank the developers of QField and R for offering fantastic open source software. It is great that, due to free software, such projects can be implemented by a comparatively small conservation society.

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