Satellite image interpretation consists of two stages: preliminary and basic. At the preliminary stage the pre-processing of remote sensing data are carried out. This stage includes image synthesis, histogram adjustment, mosaic creation and image coordinate system conversion. The basic stage is attempting to classify features in an image uses the elements of visual interpretation to identify various features or land cover classes of interest. Digital image classification uses the spectral information represented by the digital numbers in spectral bands.
Thematic projects
The specialists from SOVZOND Company have implemented a great number of projects in the field of thematic data processing of remote sensing and GIS analysis. The majority of modern methods of interpretation and analysis of satellite imagery (including original ones) give the required results regardless of a degree of task complexity, the differences in terrestrial and temporal conditions.
During the work over every project the remote sensing data that are the most appropriate for the interpretation of the object, responded to the scope of the research, selective and flexibly adaptive to local conditions and client’s requirements to the algorithms of satellite imagery processing, are selected, the additional sources of information which increase the accuracy of the results and work efficiency are defined. Field work aimed at collecting reference and proved information is carried out.
Working over every project SOVZOND specialists use only images which are the most appropriate for the purpose of target objects identification. SOVZOND experts always try to find the best methods of image interpretation taking into account customers’ requirements and local conditions of territory. If it is needed the specialists use auxiliary data and conduct field experiments for resulting map verification. All of this allows us to gain accurate imagery interpretation results and improve efficiency of the work.
SOVZOND thematic products:
- thematic vector or raster maps;
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specialized navigation systems, ready to be downloaded into a PDA (Personal Digital Assistant) or GPS-receivers;
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geographic information systems (GIS), including digital maps layers, satellite images for the area of interest, as well as user interfaces, which provides a fast and easy access to any spatially distributed information;
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statistical calculations, explication, inventory lists, statistical data graphics as well as economic and environmental assessment and practical recommendations;
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reports with detail target objects features descriptions, including practical recommendations for the territory management.
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| Fig. Dominated forest trees | Fig. Crops |
Thematic mapping aims to identify spatial distribution patterns of specific attribute (thematic) features. A thematic map is defined as a map that is specifically designed to show a particular theme. A cartographer can utilize the points, lines and polygons for map features. In map compilation, symbolization (graphic variables) is used to represent features on the earth surface. The legend explains the meaning of all the symbols on a map hence making it easy to interpret and analysis a map.
Satellite image interpretation results (vector layers and thematic maps) can be used as a source of additional information about the studying objects derived in geoinformation systems. Geoinformation systems help users to capture, store, manipulate, analyze, manage, and present all types of spatial data using methods of geospatial analysis. Geospatial analysis is an approach applying statistical analysis and other informational techniques to geospatial data. It includes geometrical processing, map algebra, surface analysis, a network and location analysis, a model building.