Planning and Cost Analysis in Orthorectification IKONOS Satellite Images
In this study, cost calculations and its activities for satellite image rectification project have been completed. Planning of satellite image rectification by the use of working flow chart and Gannt diagram have been done. Image rectification is the process of making image data to conform a map projection system. Most often the image is also oriented in such a manner that the north direction corresponds with the top of the image. Images can be converted to real-world ground coordinates by referencing the image to another source that is in the desired map projection. Source information may be obtained from another image, vector coverages, or map coordinates. In order to accomplish this task, Ground Control Points (GCPs) need to be selected from both the input source and the reference source. GCPs are points that are used to depict the same location on the Earths surface Depending on the needs of the satellite imagery in the GIS system, there are advantages and disadvantages to using either method. GCP orthorectification is a faster process and can be accomplished using existing paper maps to establish the GCPs. Using DEMs for orthorectification is a more accurate process by which to geocode digital imagery but require an existing Digital Elevation Model (DEM) or Digital Terrain Model (DTM) for processing. Once an image has been orthorectified it can be used with vector and raster data of the same coordinate system. This image can have roads, streets, buildings, etc. Spatial data can accurately measure in terms of distances and area. These data can use for more complex spatial analysis. At the same time cost of project is important criteria in this study project planning with IKONOS satellite image has been made and cost analysis investigated using 5 km*5 km Selcuk Unıversity Kampus area in Turkey. According to results cost and accuracy criteria orthorectificated satellite images have important advances for most of GIS applications.
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