ERDAS – RADARSAT MosaicPro 2D Tutorial
Open your georeferenced images into your viewer
Under the toolbox menu, open MosaicPro from 2D View
The following information is straight out of the ERDAS Imagine help files. Refer to the help file for more information.
Exclude Areas Set areas to exclude from the Image Dodging, Color Balancing, and Histogram Matching processes.
Use Illumination Equalizing Illumination Equalizing process is suitable for aerial photographs where there can be a dramatic difference in brightness across the image.
Use Image Dodging Correct light imbalance in the image. Image Dodging works by calculating statistics for the image and then applying a statistical correction to the intensity values of each pixel in each data layer.
Using satellite imagery with this option will typically not render the best results.
Use Color Balancing The Color Balancing tool attempts to remove the variations within the scene Automatic color balancing computes the correction parameters from the areas of overlap of the input images. Manual Color Manipulation provides greater control over the type of surface being applied to the image.
Use Histogram Matching Match the overall color and shading among images before the mosaic process. Histogram Matching converts the histogram of one band of an image to resemble another histogram.
As a Default I would recommend to try Histogram Balance. If this doesn’t work the first time, try switching the order of the images (dependent on which you open first). Which image is kept in the overlay area is dependent on which image is listed first. If you want to average the images in the overlap area try using the Edit à Set Overlap/Seamline Function Tool. The help file will explain the options within this tool
The NDVI tool displays stages of growth by normalizing the difference between the Red and Near Infrared bands using the equation (NIR-Red)/(NIR+Red).
From Raster—Spectral—Principal Component. Look at the output text in a text editor. Arrange it similar to this and calculate the variance (2nd row value / sum of 2nd row). If you wish you can rerun PCA on your original file and only use the first 2 or 3 […]
ERDAS Top of Atmosphere Correction To do this calculation the Spatial Model extension was used with a *.gmdx file. Select the Spatial Model file to use. This tutorial does not go into the creation of these files. You will need to learn to model this which is why for the beginner the costly atmospheric correction […]
To extract the data follow these steps. Select your input and output files and click ok. The following screen will pop up. Please note that although I’m not sure why, I find it helps to first set the file directory so that the saving folder is default. Sometimes it doesn’t work properly otherwise. (File – […]