Geospatial survey is essential to identify the different features present in an area. Field surveys should be planned to increase accuracy and quality in data.
Global Positioning Systems (GPS) and DGPS are a vital component of field survey and the selection of an appropriate system will depend on the mapping objectives and type of remotely sensed imagery being used.
Almost every remote sensing exercise will require field surveys at some stage. For example, field surveys may be needed to define habitats, calibrate remotely sensed imagery (e.g. provide quantitative measurements of suspended sediments in surface waters), or for testing the accuracy of remote sensing outputs. The importance of assessing the accuracy of remote sensing outputs is necessary for client???s satisfaction.
The aims of field survey are three-fold.
To identify each feature of interest.
To locate representative areas of each feature in order to generate spectral signatures (spectra) from the imagery.
To generate adequate additional data to test the quality or accuracy of the image classification.
Geo Resource and Infra Developers also carries out Surveys for collection of Geological and geophysical data and their validation on different maps. We offer the following services:-
A geological survey is to investigate the interested land and its subsurface soils and rocks for environmental concerns, hazard reductions and mining prospecting, etc. The goal of geological surveys usually is to build some base maps or models, including topography, stratigraphy, rock distribution and geological structure delineation, etc.
Depending on the purpose of the geological surveys, the methods involved include visual inspection, land surveying, outcrop studies, soil and rock sampling through borehole drilling, geochemical analysis, remote sensing, and geophysical surveys, etc. For example, in order to address the landslide problem in a historically problematic area, a base geological map showing the topography and subsurface stratigraphy need to be built through the geological survey. The geological map thus can be the base for further studies such as the landslide mechanism and prediction.
The geophysical survey methods involved in geological surveys include gravity, magnetic, direct current resistivity and induced polarization, seismic refraction and reflection, borehole logging, cross hole tomography, airborne geophysics and remote sensing, etc. Geophysical surveys can delineate subsurface materials in large areas more efficiently. For example, for groundwater exploration, geophysical surveys can delineate underground water reservoirs in a large area more efficiently. Based on the map provided through the geophysical surveys, more informative decisions can be made on choosing water well locations.
Field investigations carried out for the purpose of compiling hydro-geological maps and evaluating the overall hydro geological conditions of an area.
In the process of hydrogeological surveying studies are made of the rocks forming water-bearing levels, complexes, and zones, the filtering properties of these rocks, and the persistence in area and thickness of water-storing and water-resistant rocks, as well as the amount of pressure and the types, quality, and regime of underground water.
Elevation Models & Contour Creation
Lidar data is very useful to create different elevation models like DTM, DSM and DEM. The Contours of earth surface are generated from DTM. Some editing and smoothing of the DTM will also apply to get the accurate shape of the earth surface. We carry out precise contour generation to the extreme satisfaction of our clients with high pixel resolutions.
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