It is not necessary to use expensive GPS-monitoring for exploring displacements and deformations of the earth's surface. Nowadays we have a powerful and effective tool - radar interferometry, which can be used as an alternative to GPS-monitoring. Radar interferometry allows to make precise measurements on vast territories without using expensive equipment.
Radar interferometry detects displacements of the surface and of all objects located on it with the accuracy up to several millimeters. The main advantage of the radar interferometry method – independent remote assessment of changes on a large territory (from tenss to hundreds sq.km.). In addition, the dataset of satellite images, that is used for calculations, updates up to 8 times per month.

Stages of radiolocation monitoring:

1. Tasking and ordering a radar satellite surveying.
At this stage we calculate the best parameters of surveying and make a series of radar images of the AOI. The main aim of this stage is to collect a reliable dataset of satellite images which we will process later. The periodicity of collecting images depends on the task - it can be a single pair of images (differential interferometry D-inSAR) or images depicting changes throughout a month or a year (Persistent Scatterer Interferometry).

2. Data processing and analysis.
At the second stage basing on collected data we create maps of displacements and deformations of the earth's surface in a specialized software (e.g. GIS software).
As a result a customer gets the map of displacements, on which all changes of the earth's surface are displayed accordingly to each date of satellite image acquisition. The map is accompanied by a detailed technical report. Additionally maps for each of the directions (including horizontal) can be created. 

Examples of maps of city buildings' displacements are shown below:

Динамика-смещений-зданий-и-инфраструктуры-Рима.jpg

Интерферометрическая обработка изображений Рима-1.jpg

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