This section reviews band rations and how to perform some common band ratios and transformations.
These videos use the following Pro Project package (PPKX) file contained within the Band Ratios and Transformations zip file. Download and extract the PPKX file anywhere and double click on it to open the Pro project. All data used in the videos are contained within the PPKX. The user derives the output (which are not part of the PPKX). Export the results or save the Pro project once the different ratios and transformations are performed.
Band Ratios and Transformation Pro Package file: Band Ratios and Transformations zip file
Simple Band Ratio
This video shows how to use ArcGIS Pro to use the Band Arithmetic function in the Raster Functions–Data Management geoprocessing toolset. The example shows how a user can create a unique band ratio and then apply it to the image source. Check the ArcGIS Pro help for more details on many pre-defined common ratios and algorithms to perform “Band Math.” Some of the algorithms can be complex, so using some of the pre-defined options is a great way to save time, provided the image sources support such algorithms.
NDVI Several Ways
NDVI (Normalized Difference Vegetation Index) is a very common algorithm used to identify healthy green vegetation. The result can be used as-is or an an input into other subsequent image processing and modeling processes.
This video shows several ways to perform the NDVI. Although the results are effectively the same, there are some various differences explained in the video. One of the more difficult aspects of “remote sensing” analysis is the ability to interpret the results, especially, when multiple methods exist to derive the result.
Tasseled Cap Transformation
The Tasseled Cap Transformation is another common transformation used in remote Sensing. The Tasseled Cap transformation can only be applied to certain satellite systems. See the Pro help for more details.
The original tasseled cap transformation can be found here:
Kauth, R.J. and Thomas, G.S. 1976, The Tasselled Cap—A Graphic Description of the Spectral-Temporal Development of Agricultural Crops as Seen by LANDSAT. LARS Symposia, paper 159.
This video reviews the Tasseled Cap Transformation found in the Raster Functions–Analysis geoprocessing toolset. The output generates a 3 band image (band 1 – brightness, band 2 – greenness, and band 3 -wetness, respectively). It may be easier for the analyst to review each output band separately and is shown and explained in the video.