If you are looking for a specific tutorial I hope you can find it below! If you can’t, drop me a line so I know what people would like to see more of and I can think about creating one. If you are generally trying to learn a workflow, I would suggest looking through my portfolio pieces which link up to tutorials in an appropriate order.
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 […]
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 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 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 […]
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 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 […]
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 […]
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).
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 […]
Opening TerraSolid Software in MicroStation TerraSolid is a software that is integrated with microstation to process LiDAR. Through the series of these tutorials we will go through the uses of many of their products. The first step is to show you how to sign out your license (if not node locked) and load the integrated […]
Creating a Microstation Project File –> New Select your project location and name your project. Change the seed type to the appropriate kind (2d or 3d) By hitting ok above you will open up your new project which automatically displays with 4 viewers. Why 4 viewers? So you have more views! i.e top, side, oblique.
Level Manager MicroStation levels are used to separate and distinguish your drawing objects. When the drawing become complex, you will need to control the object appearances. You will need to show them in different colors, different line weight, and different line style… or you may need to show/hide objects in a certain category. You can […]
Creating Blocks Within TerraScan Terrascan organizes LiDAR data into blocks to reduce memory usage and processing times. These blocks can also be processed and edited individually. Blocks can be overlapping or non-overlapping. If you make the blocks non-overlapping you may run into future issues with connectivity of the blocks (i.e if you are trying to […]
Select the helicopter in the TerraScan menu and open the desired *.las file for viewing. If you do not know how to open the TerraScan extension then refer to that tutorial. Select the helicopter in the TerraScan menu and open the desired *.las file for viewing. If you do not know how to open […]
LiDAR : Classifying Points Typical Classes 1 – Unclassified 2 – Ground Solid 3 – Low Vegetation 4 – Medium Vegetation 5 – High Vegetation 6 – Building 7 – Low Point (noise) 8 – Model Keypoints (mass point) 9 – Water If the point class you want is not already defined…DEFINE IT! Don’t forget […]
Radar imagery interpretation is difficult and variable without ground truthing. It is not based on a spectral response that we are similar with (visible, infrared or thermal) but is instead based on polarized microwaves. What this means is that it is sensitive to the roughness and orientation and nature of the ground surface. Radarsat can […]
This tutorial goes through how to direct your project to your trajectories folder and then how to open up the trajectory window and display the trajectory in your main viewer/add it to your project. It then discusses how to clip the trajectory by an area of interest and give individual flightline names. Import Trajectories Tutorial
Causes of Errors include positional erros with the GPS/IMU, range, scan angle, boresight angles, lever-arm offsets. These are systematic errors and corrections can be applied over the entire dataset. Range Errors – Not corrected for, occur due to recording of the time between emission and return of laser – centimeter scale. Beam Divergence – Common […]
Correct Flightline Errors The measure match tool is used to determine flightline shift. The find match tool is then run to determine necessary corrections After the find match tool finishes analyzing your dataset, apply the corrections Run the measure match tool a second time to see the decrease in flightline shift. RMS error should be […]
Open up Terrascan and Read Points. It’s important to only open every 100th point for processing time. The next step is to export a lattice model. Grid spacing of 500m is acceptable because the geoid model has km long arcs. Filling gaps will prevent gaps in your TIN. Three decimal places will give you mm […]
MicroStation can only read PXYZ (point, easting, northing elevation (orthometric height)) files. You must first change your files to this format and save as *.csv. Load in a vector (*.shp file) of control point locations. This can aid in determining accuracy issues. Go to MicroStation–>Tools–>Toolboxes and select it. Turn on XYZ Text Next you […]
PCI uses landsat 8 imagery different than ERDAS Imagine. ERDAS extracts imagery for you into it’s own stacked format. For PCI you must extract the files using an unzipping program which gives you B1 etc. Open Focus Next open or drop and drag the .txt file onto Focus Select the band you would like to […]