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.
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).
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 […]