white papers

Overview Uplift and subsidence are ground displacements that can put dangerous strain on critical infrastructure, such as pipelines, buildings, dams, and roadways. To facilitate affordable, repetitive monitoring of millimeter-level ground movement, we have unveiled a new InSAR workflow called Small-baseline Subset Persistent Scatterer Interferometry (SBAS-PSI) in our CATALYST solutions.  Download The PDF Why Monitor Ground …

Monitoring Ground Movement Risk with State-of-the-art InSAR Read More »

The Kennaugh–Huynen scattering matrix condiagonalization is projected into the Pauli basis to derive a new scattering vector model for the representation of coherent target scattering. This model permits a polarization basis invariant representation of coherent target scattering in terms of five independent target parameters, the magnitude and phase of the symmetric scattering type introduced in …

Target Scattering Decomposition Read More »

The data in this mosaic covers a wide range of sea states and wind speeds which accounts for the variation of the backscattering from the water. The final output mosaic contains five layers which represent total power followed by calibrated σ0 intensities for all combinations of horizontal and vertical polarizations (i.e. HH, HV, VH and …

SAR Orthorectification and Mosaicking Read More »

The ability to identify and measure significant changes in target scattering and/or polarimetric parameters at known and co-located image locations provides a very powerful tool for large area military and/or environmental monitoring applications. This paper describes the techniques developed by PCI to calculate a “change measurement” derived from co-registered polarimetric parameters. The detected changes are …

Change Detection using SAR Data Read More »

Wetlands play a key role in regional and global environments and are critically linked to major issues such as climate change, water quality, the hydrological and carbon cycles, and wildlife habitat and biodiversity. Their existence is crucial to maintaining a balanced hydrological system, and wetlands act as indicators of environment health. Mapping wetlands and monitoring …

Wetland Characterization Read More »

The need for airphoto processing in resource, security, planning and other applications is continually increasing. How can these demands be met? Large scale projects require fast, efficient processing of thousands of images every year, providing critical information about our cities, our natural resources, our transportation, our climate, and more. In a way that traditional maps …

Improving Airphoto Processing with Automated Functions Read More »

An Empirical Line Model (ELM) was tested to correct Sentinel-2A (MSI) images acquired in the tropical archipelago of San Andrés, Colombia. This approach uses a linear regression to model the relationship between the average ground reflectance and radiance on bands 2, 3, 4, and 8, for 32 spectrally homogeneous targets. The model was validated from …

Empirical line model for the atmospheric correction of sentinel-2A MSI images in the Caribbean Islands Read More »

Geometric Correction of historical imagery is a complicated, time consuming and expensive operation. Due to a lack of development related to streamlining these operations, a significant amount of manual processing time must be invested into current projects. A system capable of achieving reliable accuracy that considerably reduces project turnaround time is required to help manage …

Semi-Automated Historical Airphoto Processing Read More »

After demonstrating the exceptional performance improvement in the orthorectification module (approximately fourteen-fold – see CATALYST Enterprise Ortho Performance Whitepaper), the same approach has been applied to the pansharp module by taking advantage of newly developed code, modern, multi-core processor architecture and nVidia Graphical Processing Units (GPUs). Download PDF