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Linking Planet imagery with a plantation monitoring system

9 November 2020

One benefit of high-revisit satellites is their ability to re-image the same location daily or weekly. In this example, we use temporal satellite observations (2016 to 2020) to track drought impact, using PlanetScope imagery to confirm the change.

Working with Scion’s Geomatics team, Indufor has extended the science and developed a monitoring approach that can be used to link satellite imagery with environmental surfaces. The particular method illustrated correlates long-term rainfall trends with satellite imagery to extract key breakpoints or thresholds that flag sustained changes in canopy cover. The monitoring system generates an ‘alert’ where canopy deterioration exceeds a pre-determined benchmark.

By way of illustration, a graph highlighted in the article here plots the vegetation index (green line) and rainfall records (blue bars) over a four-year period, across a single stand. The inclusion of rainfall data assists in explaining the temporal patterns and highlights the corelation between the satellite-derived vegetation index and monthly rainfall. For reference, the dotted line shows Indufor’s Canopy Index baseline, which for this particular stand helps to highlight the difference between the expected and actual canopy condition value.

Such an approach demonstrates the benefits of using temporal information from satellite imagery and environmental data as a screening tool. In the past, such areas may remain unnoticed unless re-mapped or visited. The appeal of the method demonstrated is that it provides a scalable monitoring solution. As alerts are created, they are synchronised to mapping dashboards using a process that provides an efficient way of sharing information across an organisation. More >>.

Source: Indufor

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