Homogeneous Distributed Scatterer (HDS) InSAR

The Homogeneous Distributed Scatterers (HDS) technique extends the traditional point target approach of CTM to find neighbourhoods of pixels that show a statistically similar response. By aggregating similar pixels, the signal to noise ratio is improved, and additional coherent pixels can be found with improved accuracy. This approach results in a very high density of trustworthy points.

HDS is a monitoring technique that provides excellent data extraction in mixed use regions, such as urban environments, which contain both the strong persistent scatterers and homogeneous neighbourhoods of pixels with similar radar return characteristics. As with all of MDA’s advanced processing options, the HDS technique employs proven techniques to reduce noise from atmosphere, topography, and orbit error.

HDS Lower Density
HDS Higher Density
Example of the use of HDS over the Vancouver Airport. The identification and processing of homogenous pixel neighbourhoods has resulted in a significant increase in the density of surface movement measurement points.