Planning and Cost Analysis in OrthorectificationIKONOS Satellite Images

摘要

In this study, cost calculations and its activities for satellite image rectificationproject have been completed. Planning of satellite image rectification by the use of workingflow chart and Gannt diagram have been done. Image rectification is the process of makingimage data to conform a map projection system. Most often the image is also oriented insuch a manner that the north direction corresponds with the top of the image. Images canbe converted to real-world ground coordinates by referencing the image to another sourcethat is in the desired map projection. Source information may be obtained from anotherimage, vector coverages, or map coordinates. In order to accomplish this task, GroundControl Points (GCPs) need to be selected from both the input source and the referencesource. GCPs are points that are used to depict the same location on the Earth's surfaceDepending on the needs of the satellite imagery in the GIS system, there are advantages anddisadvantages to using either method. GCP orthorectification is a faster process and can beaccomplished using existing paper maps to establish the GCPs. Using DEMs fororthorectification is a more accurate process by which to geocode digital imagery but requirean 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 samecoordinate system. This image can have roads, streets, buildings, etc. Spatial data canaccurately measure in terms of distances and area. These data can use for more complexspatial analysis. At the same time cost of project is important criteria in this study projectplanning with IKONOS satellite image has been made and cost analysis investigated using5 km*5 km Selcuk University Kampus area in Turkey. According to results cost andaccuracy criteria orthorectificated satellite images have important advances for most of GISapplications.