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| Name | Caption |
|---|---|
| Input Scenes | Input scene folder |
| Output Folder | Output folder |
| Output File Type | Output file type |
| Output File Options | Output file options |
| Overwrite Results | Overwrite existing results |
| Send Email | Email notification settings |
| DEM Source | DEM tile source |
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Input Scenes
The path and name of the folder containing multispectral (MS) images to process.
Output Folder
The path and name of the folder to which to write the output files.
If you do not specify a value, the output file is written to the folder specified for Input Scenes.
Output File Type
The format of the output file.
For more information on the supported file formats, see GDB-supported file formats.
Output File Options
The options to apply when creating the output file or files. The available options are specific to the file format; in each case, the default of no options is allowed.
For more information on the options available for the output file type you specify, see GDB-supported file formats.
Overwrite Results
Select this check box to overwrite the existing output files, if any exist. If this check box is left clear, and an output file exists in the relevant folder, the status of the job displays a message informing you of the existence and name of the output file. The message is also written to the event log of the job.
Send Email
If necessary, you can set up CATALYST Enterprise to send an email notification on job start and job completion.
With this check box selected, an email message is sent to each address specified in the Email Addresses box after the job starts and on completion.
You can specify one or more addresses, and each must be separated by a comma or a semi-colon. The email address of the user currently logged in displays by default.
DEM Source
The name of a file or folder containing DEM tiles.
This value may be the name of a single DEM file, the name of a folder containing DEM tiles, or the name of an index.txt file.
If the name of an existing folder is specified, the module reads the folder for a file named index.txt, and a set of DEM raster tiles. The index.txt file lists the DEM files contained in the specified folder and provides information describing each raster tile.
For more information on the format of the index.txt file and specific requirements for the individual DEM tiles, see Format of the DEM index file.
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Before running this module, the following requirements must be met to ensure the job processes successfully and produces accurate results:
That is, the available number of bands determines the levels of classification applied.
Module details
The algorithm used by the Spectral Classification module is applied according to specific rules to derive spectral indices and features from spectral bands. The features are calculated from several sensors and normalized to allow for cross-sensor comparison.
At the first classification level, only basic features are derived, and a limited number of classes are extracted, such as clouds, water, shadow, vegetation, and bare ground.
At the second level, the shortwave infrared (SWIR) band is required, and basic classes are subdivided into subclasses, such as thick or thin clouds; snow; turbid, green, shallow, or deep water; various types of active and senescent vegetation, and so forth.
The last level uses a cirrus band, if available, to extract a high-cloud class.
You can use the Spectral Classification module to generate a basic quality layer to guide further radiometric and geometric processing.
The output from the Spectral Classification module can be recoded to meet the requirements of a class layer for topographic normalization, which can be achieved by running the TOPOSOLNORM algorithm.
The possible output classes are as follows:
| Class Name | Pixel Value |
|---|---|
| no data value | 0 |
| invalid data | 1 |
| cloud master class | 10 |
| thick clouds | 12 |
| clouds detected in the cirrus band | 14 |
| semi transparent clouds | 16 |
| master class of dark area that could be shadow or water | 20 |
| shadow introduced by cloud | 24 |
| fully shaded area introduced by topography | 26 |
| shaded areas or water not attributed to cloud or topography | 28 |
| snow master class | 30 |
| water master class with a very low SWIR signal | 40 |
| deep water | 42 |
| water with algae / aquatic vegetation | 44 |
| turbid water with suspended particles | 46 |
| shallow water wit signal from the bottom substrate | 48 |
| bare land surfaces with no vegetation master class | 50 |
| bare bright soil | 52 |
| bare red soil | 54 |
| bare dark soil | 56 |
| bare burnt area with a high SWIR signal | 58 |
| vegetation master class with weak to strong vegetation response | 60 |
| senescent vegetation master class of either dark or bright areas | 70 |
| dark senescent vegetation | 72 |
| bright senescent vegetation | 74 |
| actively growing vegetation master class | 80 |
| woody actively growing vegetation | 90 |
| conifer actively growing trees | 92 |
| broad leaved actively growing shrubs and trees | 96 |
| actively growing herbaceous vegetation | 100 |
Job results
For each valid input scene, the Spectral Classification module creates a spectral-classification child job. Each output image contains one channel computed from the input file. The names of the output image files are based on the name of the input image file. That is, the name of the output file is appended with CLS to indicate it is a spectrally classified file; for example:
| Input file: | 2014-12-29T033054_RE3_1B-NAC_18998309_270548_RAW_MS.pix |
| Output file: | 2014-12-29T033054_RE3_1B-NAC_18998309_270548_RAW_CLS.pix |
| Input file: | 51194180908010853222J.pix |
| Output file: | 51194180908010853222J_CLS.pix |
You can open the processed scenes in CATALYST Professional Focus to perform quality assurance (QA).
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