Verify the rectification by displaying the new image in a viewer and Geo.Enter a file name for the output (know where on the drive you will put the file) - select the Nearest Neighborhood resampling method - click to exclude zero file values in the statistics.Ī job status dialog opens to let you know when the processes is complete. Click on the resampling icon from the Geo Correction Tool Menu.We'll use the Nearest Neighborhood algorithm. The best known algorithms for resampling are Nearest Neighborhood, Bilinear Interpolation, and Cubic Convolution. All of the raster data layers (all bands) in the source file are resampled. Resampling is the process of calculatin the values for the rectified image and creating the new file. Our next task is to resample the image.Repeat this for Top-Right, Bottom Left and Bottom Right Corners in the Topo sheet(Anti clock wise direction).You need not convert Geographic coordinates whhich are in Degree Min Sec to Decimal coordinates.Īdd them as 17 45 50 in the table provided X and Y Reference, they will be added as Decimal Coordinates. Note: In ERDAS Imagine you have to first add Longitude and later Latitude. You have to manually add the Geographic coordinates to the control, i.e, longitude and Latitude.
As soon as you click on the viewer paper coordinates are added to the GCP control.From the GCP tool bar, select GCP tool and click on the cross hair in the Viewer1(Top Left Corner).Now adjust the Maginifer box in the viewer to the top left corner of the topo sheet where you can see a cross hair mark having coordinates.In the Viewer1 you would observe a magnifier box pointing to some area and the respective area is visible in the Viewer2 at a best zoom level.As you observer there are two viewers, one in which the image to be rectified is displayed and in the other a magnified part of the image is displayed. The Ground Control Points (GCPs) are the small targets which are place on the image using the GCP tool. To open and display a raster image you can do either of the following: From the ERDAS Application select File - Open Raster Layer (Data will. GeoTIFF, BigTIFF, DEM TIFF, Geospatial PDF, ERDAS IMAGINE Raster, ECW, MrSID. Erdas Imagine 2011 with a blank 2D View 1will appear. The zoom window display that part of the image which is inside the "box" (some time called the link box). To begin your Imagine Session, double-click on the ERDAS Imagine / Imagine Icon or select it from the start-up menu. First, each viewer now has it's own "zoom" window above it.You are now ready to begin assigning real world coordinates to the non-geographic registered image. This option differs when you are Georectifying Image/Topo sheet from an existing Geometrically corrected Image/Topo sheet. You would observe the following dialog box: From the Polynomial model properties click on Projection Tab->click on Add/Change projection.Ĭlick on GCP tool Reference Setup from the Polynomial model properties.The first one is Geo Correction Tools Window and the other is Polynomial model properties.
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