Portfolio

  • MicroStation : Accuracy Assessment

    MicroStation : Accuracy Assessment

    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 […]

  • Microstation : Geoid Adjustment – Ellipsoidal to Orthometric Heights

    Microstation : Geoid Adjustment – Ellipsoidal to Orthometric Heights

    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 […]

  • ERDAS – Normalized Difference Vegetation Index (NDVI) Tutorial

    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

    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)

    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 […]

  • PCI – Top of Atmosphere Correction

    PCI – Top of Atmosphere Correction

    Once you have all of your landsat 8 bands ingested into PCI (click here for more details) you can run an atmospheric correction on them. Once you choose your *.pix image the rest of the information should load for you.

  • ERDAS – Top of Atmosphere Correction for Landsat 8

    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 […]

  • PCI – Extract Landsat8 Data

    PCI – Extract Landsat8 Data

    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 […]

Portfolio

 

Remote Sensing

Geoprocessing and Spatial Analysis

GIS and Thematic Maps

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