Satellite remote sensing is a useful tool to estimate CRC efficiently on a regional scale. Meyer’s study used both optical and microwave Synthetic Aperture Radar (SAR) data to estimate CRC for the Lower Trent Region. SAR data is particularly useful for this type of study as it is not dependent on clear weather conditions to get an accurate picture of what’s happening on the ground. However, SAR is not always a go-to data type since it has an undeserved reputation for being difficult to work with.
NV5 Geospatial offers the software package ENVI® SARscape Analytics, which provides easy-to-use workflows for some of the most common SAR processing applications. "ENVI SARscape Analytics opened a window for us to operationalize SAR in a way we didn't think possible. Before it seemed abstract and experimental, but now we understand that's far from the truth," said Meyer.
Image: Optical vs SAR imaging
“ENVI SARscape Analytics opened a window for us to operationalize SAR in a way we didn't think possible"
- Jeff Meyer
Lower Trent Conservation Authority
Meyer acquired Sentinel- 1 and Sentinel- 2 images over a period of time "We made heavy use of the Sentinel Download tool and Time Series tool in ENVI SARscape Analytics to extract a wealth of information for this project,” said Meyer. The Sentinel Download tool provides automatic download of Sentinel-1 and Sentinel-2 data. The workflow lets users choose an area of interest, dates, and other filters, and downloads multiple Sentinel-1 and Sentinel-2 scenes to use instead of having to manually download them one at a time from a web service.
“ENVI SARscape Analytics greatly reduced the burden of downloading and processing Sentinel-1 data,” said Meyer. “In the future we are interested to explore the Flood Mapping tool in the software to get near near-real time observations during flood events. Flood warning and forecasting is an important part of what we do here, so getting actual observations is very useful for future planning."