ERDAS : Import GLOBE DEM Data (Assign Origin)
The import manager will open the dialogue to the right. Select the data to be imported and the export location. Click Ok. The next dialogue has information that needs to be provided (highlighted below). For the example dataset BIL and Signed 16 bit should be used. For more info on what signed/unsigned bits are look […]
ERDAS – Normalized Difference Vegetation Index (NDVI) Tutorial
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).
ERDAS – Tesseled Caps Transformation Tutorial
You may not be able to select a Landsat 8 Sensor as we are only using a subset of the entire data (i.e no thermal or pan band to read)
ERDAS – Principal Components Analysis (PCA)
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 for Landsat 8
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 […]
ERDAS – Extract Landsat8 data
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 – […]
ERDAS – Mosaicking using MosaicPro 2D Tutorial
ERDAS – RADARSAT MosaicPro 2D Tutorial MosaicPro 2D Open your georeferenced images into your viewer Under the toolbox menu, open MosaicPro from 2D View To see the raster image select And check “Vis” beside both images You can save this workspace by selecting save Go to Edit –> Colour Corrections This opens up the Color […]
ERDAS – OrthoRADAR Orthorectifying Tutorial
ERDAS – RADARSAT OrthoRADAR Tutorial OrthoRADAR Tool Open the OrthoRadar tool. The purpose of this tool is to warp the image to fit a DEM model. It can also georectify an image using satellite orbital information. Data will be more accurate if previously georectified. Choose to geometrically correct a file either from a viewer or […]
ERDAS – RADARSAT AutoSync Georeferencing Wizard Tutorial
ERDAS – RADARSAT AutoSync Georeferencing Wizard AutoSync Georeferencing Wizard Images that have not been assigned positional information need to be georeferenced. There are multiple ways to do this in ERDAS including using the georeferencing wizard. This method may not always work and does require that you have accurate imagery to georeference your image to. Open […]
ERDAS – RADARSAT Import
importing RADARSAT data into ERDAS Imagine ERDAS – RADARSAT Import Setting Preferences For any project you are working on it can be beneficial to set up a default folder so that you aren’t constantly having to change where data is being saved to or losing files to temp directories. Import RADARSAT Data RADARSAT data must […]