Some MultiSpec Tutorials/Exercises
The following are some small tutorials or exercises that one can follow to gain some experience using MultiSpec. These tutorials will illustrate how to display multispectral and thematic images, run unsupervised classification (ISODATA), run supervised classifications view the results, learn how to combine separate image files into one image file, overlay shape files onto images, enhance images and work with the coordinate view. There is a separate pdf document for each tutorial. Note that there are some tutorials in Spanish provided by a MultiSpec user at the bottom of the page.
The documents are in Adobe Acrobat Format and can be read within your web viewer
if you are using version 3 or later of Netscape Navigator and version 4 or later
of Acrobat Reader. An Acrobat Reader for Macintosh, Windows, or Unix can be downloaded
Tutorials 1-4 & 6-7 were revised in October 2009; tutorials 8 & 9 were added in June/July 2010; tutorial 5 was revised in September 2013. Tutorial 10 was added in August 2014.
- Display and Inspection of Image
Data with MultiSpec
In this exercise, you will display an aircraft image file and view the data in several ways using MultiSpec.
- Image Enhancement
This exercise illustrates how you can control the enhancement of the image in the multispectral image window by setting five different options in the Enhancement portion of the Display Specifications dialog box.
- Unsupervised Classification
Two Clustering algorithms are available in MultiSpec. They are useful in grouping similar pixels in the image into clusters or categories. One algorithm implemented is a simple one-pass type. The second is an iterative type called ISODATA. You will use the ISODATA algorithm for this exercise.
- Supervised Classification
You can also do a supervised classification of an image file by selecting training areas for selected classes from known areas.
- Combining Separate
Image Files into a Single Multispectral Image File
One can use the "Logically Linking" capability in MultiSpec to link several image files together to be treated as one image file in an image window and/or create a new image file that incorporates all of the separate images. For example many times one will receive Landsat images from the EROS Center via ftp or on a DVD that contains one file for each of the 4-10 Landsat bands. This tutorial will illustrate how to do this. (A sample set of individual bands can be downloaded or you can provide your own set of files.)
- Overlay Shape
Files on Image Window
This exercise will illustrate how to open ArcView Shape files and overlay them onto an image.
- Selecting Areas and the Coordinate
One can make selections of areas within an image using line-column units, map units or latitude-longitude units. The map and latitude-longitude units are only available for images where the required map projection information is available. This exercise will illustrate how this work.
- Creating Vegetation Indices
One can create images that represent algebraic combinations of the original channels of an image to try to enhance the image. This technique is used to enhance the vegetation or mineral variations in the image. One example is the Normalized Vegetation Index (NDVI) image. This exercise will illustrate how to do this.
- Handling HDF and netCDF Formatted Image
HDF and netCDF formatted files can contain from one to many data sets. The data sets can be any combination of tables, arrays and raster images. Each of the raster images can contain multiple channels and represent different spatial resolutions and data types. This exercise illustrates how to use MultiSpec to select HDF/netCDF image datasets (or a group of image data sets) to be used like any other raster image file. An ASTER HDF file is used as the example.
- Visualizing Growing Degree Day (GDD) Images
This exercise illustrates how MultiSpec can me used for handling and analysis of general geospatial images. The image data used in this example is not multispectral data collected by a satellite or aircraft or the results of analysis of those data. Rather it is a geospatial image created from gridded data obtained from the Applied Climate Information System (ACIS); the data is derived from measurements collected by many weather stations.
Tutorial/Exercise Image Files
Image file used for exercises 1, 2, 3, 4 and 8 (ag020522_DPAC_cd.lan).
Image file and shape files used for exercise 5 (L7_20000606_Indy band files).
Image file and shape files used for exercise 6 (L7_20000606_Indy.tif).
Image files used for exercise 7 (three pampas files).
Image file used for exercise 9 (AST_L1B_003100120051001.hdf).
Image file and shape file used for exercise 10 (gdd_2012_accumulated.tif).
AmericaView Middle to High School Tutorials
AmericaView helped sponsor the development of tutorials which introduce middle to high school students to land cover classification using MultiSpec. They can be accessed from AmericaView's Earth Observation Day web site. They were developed by the University of Georgia Chapter of the America Society for Photogrammetry and Remote Sensing (ASPRS).
Tutorials (Greek) provided by Konstantinos Papatheodorou of Geomatics & Surveying Department, Technological Education Institute, Serres, Greece.
Tutorials (Hungarian) provided by Imecs Zoltán of Babes-Bolyai University, Cluj, Romania.