- About Us
- Mission Statement
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- Loan application and report forms
- Example loan forms
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- Reflectance Panel and Short Term Loans
- Instruments
- Field Spectroradiometers
- SVC HR-1024i
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- Sunphotometers
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- Legacy Equipment: GER1500
- Resources
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FOV Calculator- Post Processing
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FSF User Group
The Field Spectroscopy Facility User Group provides a selection of useful utilities designed to facilitate the handling and processing of data recorded by field-portable spectroradiometers. The utilities include a set of MATLAB scripts for importing and processing spectral data as well as spectral response functions for various satellite and airborne instruments to allow comparison of these instruments' spectra with field spectra.
All the utilities and data are freely available to the user community from this page. We hope that other users will contribute any code or programs they have for spectral data handling and processing, which may be useful to others.
If you have any questions regarding the User Group, or wish to contribute any utilities for inclusion in this resource, please contact us. If you have questions or comments about specific programs in this resource, please contact the contributor. And don't forget, if you use any of the resources here, please acknowledge their use in any resulting publications!
Python scripts for 6S and ProSAIL
Py6S is a Python interface to the respected 6S atmospheric Radiative Transfer Model which makes it significantly easier to use and adds useful new functionality. All of the functionality of the 6S model is supported, and various helper methods are provided to make common operations - such as running a simulation for a number of angles, or for all of the bands of a satellite sensor - very easy. Field spectroscopy data can also be imported and used to configure the ground reflectance of the model, allowing simulations of the at-sensor radiance that would be measured for a set of field spectral measurements. Py6S is fully integrated with the Python NumPy, pandas and Matplotlib modules to allow easy plotting of results and import/export of data. The code for Py6S can be accessed here.
PyProSAIL is a very simple Python interface to the ProSAIL combined leaf and canopy reflectance model. In a similar manner to Py6S, it provides a far nicer interface to the model, and allows easy plotting of the results. PyProSAIL can also be integrated very easily with Py6S, for example, to simulate how changes in leaf properties, and thus the reflectance of the canopy, would be manifested in the radiance received at a satellite. The code for PyProSAIL can be accessed here.
FSF Post Processing Toolbox for MATLAB
The Field Spectroscopy Facility (FSF) Post Processing Toolbox provides functions for importing and processing spectra in MATLAB. MATLAB is a numerical computing environment and processing language that enables flexible handling, plotting, analysis and processing of spectral data.
Import functions
The toolbox can import data from the file formats used by a number of portable spectroradiometers into the MATLAB workspace. The suported file formats are shown in the table below.
Supported file formats
| Manufacturer | Instrument | File format | Supported? |
|---|---|---|---|
| Analytical Spectral Devices | FieldSpec Pro | ASCII | Yes |
| Binary | Partially* | ||
| FieldSpec 3 | ASCII | Yes | |
| Binary | Partially* | ||
| Spectra Vista Corporation | GER 1500 | Signature | Yes |
| GER 3700 | Signature | Yes | |
| HR-1024 | Signature | Yes | |
| FSF | V-SWIR | DTA | Yes |
| Ocean Optics | USB spectrometers | OOI Binary | Partially |
| * We recommend converting binary files to text files with ViewSpec Pro which is freely available from ASD Support Central. | |||
Processing functions
The toolbox provides a range of additional processing functions to:
- Pair target and reference spectra using information from a logsheet
- Calculate relative reflectance
- Calculate absolute reflectance using a panel calibration spectrum
- Smooth spectra with a Savitzky—Golay filter
- Remove water band spectral regions
- Convolve spectra with the spectral response functions of satellite or airborne instruments
Get the toolbox
Download from MATLAB Central.
Installation instructions
- Unzip the file.
- Copy the FSFPostProcessing1.3.0 folder into a location accessible from MATLAB (e.g. onto the server on which MATLAB runs).
- Start MATLAB.
- Add the folder to the MATLAB path using the search path tool.
Documentation
Documentation is provided in a User Guide (PDF file). Additional help is available within MATLAB in the Help Browser.
Contributor information
These post processing scripts were written my Alasdair Mac Arthur and Iain Robinson. We welcome comments, suggestions, bug reports and user-contributed features.
Spectral response functions
Spectral response functions (bands) are provided for a number of instruments. These can be convolved with field spectra for comparison, ground truth or calibration purposes. The files can be loaded into MATLAB using the Post Processing Toolbox described above.
The Field Spectroscopy Facility does not gaurantee the accuracy or vailidty of these data. Please use them with care! We welcome all corrections, additions and contributions; please email iain@physics.org.
| File | Instrument |
|---|---|
| ALI | Advanced land imager |
| ASTER | Advanced spaceborne thermal emission and reflection radiometer |
| ATSR-1 | Along track scanning radiometer 1 |
| ATSR-2 | Along track scanning radiometer 2 |
| AVHRR | Advanced very high resolution radiometer |
| CHRIS | Compact high resolution imaging specrometer |
| CZCS | Coastal zone color scanner |
| Formosat | |
| IKONOS2 | Ikonos earth observation satellite |
| IRS | |
| Kompsat2 | Korea multi-purpose satellite 2 |
| Landsat4TM | Landsat 4 thematic mapper |
| Landsat5TM | Landsat 5 thematic mapper |
| Landsat7TM | Landsat 7 thematic mapper |
| LandsatMSS | Landsat multispectral scanner |
| MERIS | Medium resolution imaging spectrometer |
| MISR | Multi-angle imaging spectroradiometer |
| MODISAqua | Moderate resolution imaging spectrometer flight model 1 |
| MODISTerra | Moderate resolution imaging spectrometer protoflight model |
| MOS | |
| Meteosat-MSG | |
| OCTS | Ocean color temperature sensor |
| OSMI | Ocean scanning multispectral imager |
| POLDER | Polarization and directionality of the earth's reflectances |
| QuickBird | |
| SeaWiFS | Sea-viewing wide field-of-view sensor |
Contributer information
These sets of spectral response functions were provided by Michael Steven and Tim Malthus.
Disclaimer for FSF user group resources
By providing these resources to the user community the Field Spectroscopy Facility (FSF) takes no responsibility for the use of the software or any other resources provided on this webpage. While all reasonable steps have been taken by FSF to ensure that the resources contributed to this group perform the task described, the FSF cannot be held responsible for any problems experienced while using the datasets. Any questions or technical issues relating to an individual item should be directed to the original contributor, and not directly to the FSF. The original contributor retains the IPR for their software/program.
