Changes between Version 11 and Version 12 of Downloads/Processing/tuiview


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Timestamp:
Apr 18, 2017 2:36:54 PM (5 months ago)
Author:
dac
Comment:

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  • Downloads/Processing/tuiview

    v11 v12  
    11= TuiView =
    22
    3 [http://tuiview.org/ TuiView] is an open source data viewer similar to ENVI / ERDAS Imagine, the initial development was funded Landcare Research NZ Ltd. It is build on top of GDAL and is capable of opening any data formats GDAL can read, including BIL, BSQ and GeoTiff. ARSF have contributed a number of features to TuiView for better handling of hyperspectral data.
     3[http://tuiview.org/ TuiView] is an open source data viewer similar to ENVI / ERDAS Imagine, the initial development was funded Landcare Research NZ Ltd. It is build on top of GDAL and is capable of opening any data formats GDAL can read, including BIL, BSQ and GeoTiff. NERC-ARF-DAN have contributed a number of features to TuiView for better handling of hyperspectral data.
    44
    5 Within ARSF it is used as a general image viewer for hyperspectral data and DEMs and as part of the procedure for determining SCT values.
     5Within NERC-ARF it is used as a general image viewer for hyperspectral data and DEMs and as part of the procedure for determining SCT values.
    66
    77TuiView is opened from the command prompt by typing:
     
    1111}}}
    1212
    13 Add images using the 'Add Raster' button in the top left, select the format from the dropdown menu. It is also possible to add zipped bil files (such as those ARSF deliver) by selecting 'All files' and clicking on the .zip file.
     13Add images using the 'Add Raster' button in the top left, select the format from the dropdown menu. It is also possible to add zipped bil files (such as those NERC-ARF deliver) by selecting 'All files' and clicking on the .zip file.
    1414
    1515The range of pixel values within an image often does not fall between 0 - 255, as required for display, therefore it is necessary to 'stretch' the values for display. Within TuiView the stretch of the image is adjusted using the 'stretch' dialogue, brought up by through the 'edit -> stretch' menu or right clicking a layer in the list of layers. Within the stretch dialogue the bands displayed and the type of stretch can be selected. A standard deviation stretch which will scale the pixel values to from the image mean - n*standard deviation to the image mean + n*standard deviations. The stretch can be applied to a single image (single arrow) or all open images (multiple arrows) as shown below.
     
    1717[[Image(tuiview_stretch.png, width=500​, align=center)]]
    1818
    19 You can set up the default stretch to apply using the File -> Default Stretch dialogue. There are a number of rules which can be set to determine which stretch to apply given the number of bands in an image and if a colour table is present or not. Changing rule 2 (single band - no colour table) and rule 3 (three bands - no colour table) to use a standard deviation stretch, rather than the default of none is a good idea. The stretches are stored in the TuiView preferences file (~/.config/Viewer/viewer.conf), a config file with rules for ARSF data is attached to this page.
     19You can set up the default stretch to apply using the File -> Default Stretch dialogue. There are a number of rules which can be set to determine which stretch to apply given the number of bands in an image and if a colour table is present or not. Changing rule 2 (single band - no colour table) and rule 3 (three bands - no colour table) to use a standard deviation stretch, rather than the default of none is a good idea. The stretches are stored in the TuiView preferences file (~/.config/Viewer/viewer.conf), a config file with rules for NERC-ARF data is attached to this page.
    2020
    21 It is possible to get pixel values and view spectral profiles of the top image layer using the query tool and selecting 'plot' in the pop up as shown below. Where wavelenghts are stored in the header file these will be used for the x-axis.
     21It is possible to get pixel values and view spectral profiles of the top image layer using the query tool and selecting 'plot' in the pop up as shown below. Where wavelengths are stored in the header file these will be used for the x-axis.
    2222
    2323[[Image(tuiview_spectral_profile.png, width=500, align=center)]]