envi 5.2 - release notes
DESCRIPTION
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ENVI 5.2 Release Notes
Revised 18 September 2014
Supported Platforms
New Features
Known Issues
Fixed Issues
Backward-Compatibility Notes
Please visit the Help Articles section of the Exelis website (www.exelisvis.com) for the most
up-to-date release notes.
Supported Platforms
Platform Hardware Supported Versions
Windows Intel/AMD 32-bit XP SP2, Vista, 7, 8
Intel/AMD 64-bit XP, Vista, 7, 8
Macintosh Intel 64-bit OSX 10.8, 10.9
Linux Intel/AMD 64-bit Kernel 2.6.32, glibc 2.12
An X-Windows manager is required for Macintosh. The software products were tested using
XQuartz 2.7.4.
ENVI Classic is also supported on Solaris 10 SPARC 64-bit systems.
For optimal performance, your video card should have a minimum of 1 GB of RAM and
should support OpenGL 2.0 or later. Also be sure to install the latest drivers for your video
card. An HTML5-compatible browser is required to view the ENVI Help.
New Features
ENVI 5.2 includes the new and enhanced features listed below. See the following sections:
Sensors and Data Formats
Image Processing
Esri Integration
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User Interface
Programming
Sensors and Data Formats
ENVI reads and displays imagery from the following sensors and data formats:
AlSat-2A
Deimos-1
Gaofen-1
GRIB-1 and GRIB-2
Multi-page TIFF
NetCDF-4
Proba-V S10 TOC products, including NDVI
Proba-V S1 TOA and TOC products
SkySat-1 Image Frames
WorldView-3
Ziyuan-1-02C and -3A
ENVI plays videos files, including those from Skybox Imaging. The Full Motion Video player
displays MISB metadata if the video file contains it. Export individual frames to the
ENVI display for further analysis, or convert a video file to a time-enabled raster series.
ENVI reads the following video formats in the Full Motion Video player:
Adobe Flash Video (.flv, .f4v)
Adobe Shockwave Flash (.swf)
Animated Graphics Interchange Format (.gif)
Apple Quicktime (.mov)
Audio Video Interleaved (.avi)
Google WebM Matroska (.webm)
Matroska Video (.mkv)
Motion JPEG (.mjpeg, .mjpg)
Motion JPEG2000 (.mj2)
MPEG-1 Part 2 (.mpeg, .mpg, .mp1, .m2v)
MPEG-2 Transport Stream (.ts)
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MPEG-2 Part 2 (.mpeg, .mpg, .mp2, .mpg2, .mpeg2, .mpv, .m2v)
MPEG-4 Part 12 / 3GPP / 3GPP2 (.3gp, .3g2)
MPEG-4 Part 14 (.mp4, .mpg4, .mpeg4, .m4v, .h264)
Skybox (SkySat) video files
Image Processing
Spatiotemporal Analysis
You can build a series of images (also called a raster series) for spatiotemporal analysis,
which provides the ability to understand and predict Earth surface processes or human
activities over space and time. ENVI automatically reads raster "acquisition time" metadata
from a wide variety of sensor data sources. Use the following tools:
Build Raster Series: Create a series file that references the file locations of images
in your collection. You can order the raster series sequentially according to
acquisition time metadata.
Reproject Raster Series: Normalize a stack of rasters to a common spatial grid
with automatic resampling and reprojection.
Series/Animation Manager: View and animate a spatiotemporal series with time
slider and wheel controls. Also export a raster series to common video formats.
Write IDL scripts to perform all of these tasks; see the Programming section
below.
Learn how to build and animate a series of Landsat images in the Time Series
tutorial.
Spectral Indices
Use the Spectral Indices tool to compute various indices (one at a time), including
vegetation, geology, man-made features, burned areas, and water. It includes all of the
existing vegetation indices from the Vegetation Index Calculator.
The following are new vegetation indices:
Difference Vegetation Index
Global Environmental Monitoring Index
Green Atmospherically Resistant Index
Green Difference Vegetation Index
Green Normalized Difference Vegetation Index
Green Ratio Vegetation Index
Green Vegetation Index
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Infrared Percentage Vegetation Index
Leaf Area Index
Modified Chlorophyll Absorption Ratio Index
Modified Chlorophyll Absorption Ratio Index - Improved
Modified Non-Linear Index
Modified Simple Ratio
Modified Triangular Vegetation Index
Modified Triangular Vegetation Index - Improved
Non-Linear Index
Normalized Difference Water Index
Normalized Multi-band Drought Index
Optimized Soil Adjusted Vegetation Index
Red Green Ratio Index
Renormalized Difference Vegetation Index
Soil Adjusted Vegetation Index
Simple Ratio
Transformed Chlorophyll Absorption Reflectance Index
Transformed Difference Vegetation Index
Triangular Vegetation Index
Visible Atmospherically Resistant Index
WorldView Improved Vegetative Index (WV-VI)
The following are new indices for other features:
Burn Area Index
Clay Minerals Ratio
Ferrous Minerals Ratio
Iron Oxide Ratio
Normalized Burn Ratio
Normalized Burn Ratio Thermal 1
Normalized Difference Built-Up Index
Normalized Difference Snow Index
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WorldView Built-Up Index
WorldView New Iron Index
WorldView Non-Homogenous Feature Difference
WorldView Soil Index
Use the ENVIQuerySpectralIndices API routine to determine which indices can be computed
for a given image.
Write IDL scripts to compute spectral indices; see the Programming section below.
An EO-1 Hyperion Vegetation Indices tutorial shows how to pre-process Hyperion data and
use vegetation indices to examine areas of unhealthy vegetation in a forest.
A Burn Indices tutorial shows how to create and compare spectral indices of burned areas
from Landsat-8 imagery.
Other New Image Processing Features
The NNDiffuse Pan Sharpening tool uses the nearest neighbor diffusion (NNDiffuse) pan
sharpening algorithm to create a pan-sharpened raster from a low-resolution multispectral
raster and a high-resolution panchromatic raster.
A hyperspectral analysis tutorial explains how to use Spectral Angle Mapper (SAM)
classification and Spectral Feature Fitting (SFF) to compare image spectra to reference
spectra.
The Scatter Plot tool has been updated for the new ENVI interface. Select bands from
different rasters, create density slices, import/export ROIs, create a spectral profile,
calculate mean spectra and class statistics, export plots to common formats, etc. The
"dancing layers" functionality highlights pixels that correspond to the cursor location in the
Image window.
The Raster Color Slice tool performance has improved; the histogram plots have tick marks
and labels, the ability to zoom in/out, and a cursor crosshair that reports pixel values.
The Feature Counting tool has been redesigned:
Features are listed in a table view that provides colored text and the ability to sort
features.
Symbols, labels, and counts can be turned on and off in the display.
New symbols have been added.
Geolocation parameters are automatically determined for features derived from a
georeferenced image.
Features contain an optional Description field for capturing additional details.
A Grid option allows you to overlay grids on the top-most layer listed in the Layer
Manager.
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Save features to an ENVI Feature Counting file (.efc) and restore this type of file
in a future ENVI session. You can also save features to shapefiles and
geodatabase files.
Restoring ENVI Classic ROI files (.roi) maintains their original geometry without converting
polygons to pixels.
The n-D Visualizer Export All function exports ROIs back to the ROI Tool.
Esri Integration
The Layer Manager and Data Manager have right-click Refresh options to reload saved
modifications to an Esri Layer file in a concurrent session of ArcMap software.
Create a new File Geodatabase in ENVI and write directly to it.
ENVI reads and writes to ArcGIS 10.2 Enterprise SDE Geodatabases via .sde connection
files.
ENVI's 32-bit application shortcuts for use with ArcGIS for Desktop software are located
under the ENVI 5.2 > ENVI for ArcGIS folder in the Windows Start menu.
The Remote Connection Manager has been enhanced as follows:
ENVI lists the same Enterprise SDE Geodatabase connections as ArcCatalog software's "Database Connections."
ENVI displays the same user interface dialogs as ArcGIS for Desktop software, for
establishing Enterprise SDE Geodatabase connections.
For ArcGIS for Server connections, ENVI only lists the supported Image Services
data assets on the server.
A Mouse Wheel Zoom Direction preference controls the direction of the mouse wheel, so you
can match the direction that ArcMap software uses.
Send datasets to ArcMap software using the Data Manager, Layer Manager, and the File >
Chip View to ArcMap menu option.
Save data to a new geodatabase that is compatible with the currently installed version of
ArcGIS software.
User Interface
Export the contents of a display view to a Geospatial PDF file. Chip the view at display
resolution, or export all raster dataset layers in the view at full resolution.
Export the contents of a display view to Google Earth.
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Animate through bands of an image by selecting Display > Band Animation. Or, right-click
on an image layer in the Layer Manager and select Band Animation.
A Preview option is available for NNDiffuse Pan Sharpening, Classification Aggregation, and
Spectral Indices that allows you to dynamically preview processing results for the area
displayed in the Image window before processing the full image.
The Layer Manager and the Toolbox panels can be widened by clicking and dragging on the
side of the panel.
The snail trail in the Overview window can be saved to a file.
Create placemarks of geographic locations to quickly find different places in the Image
window.
The vector and annotation buttons have been merged into two drop-down lists on the
toolbar.
The Preferences dialog has a new search field. Preferences are stored in JSON format, and
both 64-bit and 32-bit application modes share the same preferences.
The Undo and Redo buttons have been removed from the toolbar; these functions are still
available under the Edit menu and by using Ctrl-Z and Ctrl-Y keyboard shortcuts.
The Select HDF5 Datasets dialog was renamed to the Dataset Browser; use this dialog to
build raster files from NetCDF-4 and HDF5 datasets.
The Favorites section of the Toolbox has more options for managing favorite tools.
You can select a quick stretch type while defining a spatial subset.
You can right-click on an image in the Layer Manager and select Quick Stats to view image
statistics.
Highlight a vector record in the Attribute Viewer table, then click Go To in the menu bar to
center the image window over its location and to highlight the selected vector.
Use the File > Save As menu option to save images to ASCII, ArcView Raster, CADRG, CIB,
ER Mapper, ERDAS IMAGINE, JPEG2000, and PCI formats. These save options were
previously available through the Toolbox.
Programming
A new ENVI API Programming Guide in the ENVI Help explains how to write IDL scripts to
extend ENVI functionality.
Use these new routines to write scripts that perform image-processing tasks. You can also
publish these tasks to client applications using ENVI Services Engine.
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Task Description
ENVIAutoChangeThresholdClassificationTask Perform image change detection using
automatic thresholding.
ENVIBuildBandStackTask Combine bands from different images into a
single image. Use a combination of this
routine and ENVIRegridRasterTask to create
a layer stack.
ENVIBuildRasterSeriesTask Build a raster series file for spatiotemporal
analysis.
ENVIBuildTimeSeriesTask Build a raster series file, ordered by
acquisition time, for spatiotemporal analysis.
ENVIChangeThresholdClassificationTask Perform image change detection using
manual thresholding.
ENVIClassificationAggregationTask Clean up classification results using an
aggregation operation.
ENVIClassificationSmoothingTask Clean up classification results using a
smoothing operation.
ENVIClassificationToShapefileTask Export one or more classes to a single
shapefile.
ENVIColorSliceClassificationTask Create a classification raster by thresholding
select data ranges and colors.
ENVIDarkSubtractionCorrectionTask Perform dark subtraction atmospheric
correction.
ENVIDimensionsResampleRasterTask Resample an image to different spatial
dimensions.
ENVIForwardICATransformTask Perform a forward independent component
analysis (ICA) transform.
ENVIForwardMNFTransformTask Perform a forward minimum noise fraction
(MNF) transform.
ENVIForwardPCATransformTask Perform a forward principal components
analysis (PCA) transform.
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ENVIFXSegmentationTask Perform a Feature Extraction segment-only
workflow.
ENVIGramSchmidtPanSharpeningTask Perform Gram-Schmidt pan sharpening.
ENVIImageBandDifferenceTask Perform a difference analysis on a specific
band in two images.
ENVIImageIntersectionTask Compute the overlapping area of two
images.
ENVIImageThresholdToROITask Define one or more ROIs using at least one
threshold.
ENVIISODATAClassificationTask Perform unsupervised classification using
the ISODATA method.
ENVIMahalanobisDistanceClassificationTask Perform Mahalanobis Distance supervised
classification.
ENVIMappingResampleRasterTask Resample an image to different dimensions
using column and row mapping.
ENVIMaximumLikelihoodClassificationTask Perform Maximum Likelihood supervised
classification.
ENVIMinimumDistanceClassificationTask Perform Minimum Distance supervised
classification.
ENVINNDiffusePanSharpeningTask Perform NNDiffuse pan sharpening.
ENVIPCPanSharpeningTask Perform PC pan sharpening.
ENVIPercentThresholdClassificationTask Segment an image into anomalous and non-
anomalous regions.
ENVIPixelScaleResampleRasterTask Resample an image to different dimensions
by multiplying the pixel size by a scale
factor.
ENVIQuerySpectralIndicesTask Determine which spectral indices are
available for a given image.
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ENVIRadiometricNormalizationTask Create an image from two rasters that
minimizes their differences caused by
inconsistent image acquisition conditions.
ENVIRasterStatisticsTask Calculate basic image statistics.
ENVIRasterViewshedTask Calculate a viewshed from a DEM.
ENVIRegridRasterSeriesByIndexTask Reproject a raster series to a spatial grid,
using the grid parameters of a selected
raster index.
ENVIRegridRasterSeriesByIntersectionTask Reproject a raster series to a spatial grid,
using the geometric intersection of all of the
rasters.
ENVIRegridRasterSeriesByUnionTask Reproject a raster series to a spatial grid,
using the geometric union of all of the
rasters.
ENVIRegridRasterTask Reproject an image to a spatial grid.
ENVIROIToClassificationTask Create a classification image from ROIs.
ENVIRXAnomalyDetectionTask Perform Reed-Xiaoli (RX) anomaly detection.
ENVISpectralAngleMapperClassificationTask Perform Spectral Angle Mapper (SAM)
supervised classification.
ENVISpectralIndexTask Create a spectral index image from one pre-
defined index.
ENVISpectralIndicesTask Create a multi-band image, where each
band is a different spectral index.
ENVIThematicChangeTask Input two classification images of the same
scene taken at different times and identify
differences between them.
ENVITrainingClassificationStatisticsTask Compute statistics from classification
training regions.
ENVIVectorAttributeToROIsTask Create ROIs from geometry records in a
vector.
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ENVIVectorRecordsToROITask Create one ROI from all geometry records in
a vector.
ENVIVegetationSuppressionTask Remove the vegetation spectral signature
from multispectral and hyperspectral
imagery.
ENVIVideoToRasterSeriesTask Export frames from a video file to a raster
series.
Use the ENVIGridDefinition routine to create a spatial grid definition, which is used to
georeference rasters and vectors to a common coordinate system. ENVIGridDefinition is
only a definition, not a spatial reference or raster. It can be used as an input to
ENVISpatialGridRaster or to define the grid parameters for an empty raster.
Use the ENVIMetaspectralRaster routine to create an image that consists of bands from
different images. Or, use this routine in combination with ENVISpatialGridRaster to create a
georeferenced layer stack.
Use the ENVINNDiffusePanSharpeningRaster routine to create nearest neighbor diffusion
(NNDiffuse) pan sharpened rasters from a low-resolution raster and a high-resolution
panchromatic raster.
Use the ENVIPreferences and ENVIPreferenceItem routines to manage preference settings.
Use the ENVIRasterSeries routine to build a series of images for spatiotemporal analysis.
Then use the ENVIRasterSeriesLayer routine to display the raster series.
Use the ENVIRasterStatistics routine to get statistics for all bands of an image.
Use the ENVIResampleRaster routine to resample images.
Use the ENVISpatialGridRaster routine to project an image to a standard spatial reference.
Use the ENVISpectralIndexRaster routine to create new rasters based on common spectral
indices.
The ENVIView routine has a new ChipToVideo method that saves an animation from
spatiotemporal analysis to a variety of video file formats.
The ENVIRaster::Subset method has been deprecated. Use ENVISubsetRaster for spatial
and spectral subsetting.
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Known Issues
ID Description
ENVI-
70066
Opening two GF-1 WFV images results in image artifacts
Opening two Gaofen-1 images in the same view results in gaps of data. Workaround:
Display multiple Gaofen-1 images in separate views.
ENVI-
70110
Georeferencing from GLT produces holes in a south polar
stereographic projection
When using Latitude/Longitude bands to create a geographic lookup table (GLT), images
geogreferenced using the GLT in a southern hemisphere polar stereographic projection
contain holes near their center.
ENVI-
70139
Vector layer is hidden temporarily on "Accept" while animating a
raster series
If you draw a polygon vector layer and accept it while a raster series is animating, the
polygon layer disappears. Workaround: Pause the animation between Accept operations,
or step through the series one frame at a time while editing the vector layer.
IDL-69220 Java bridge not configured properly when running 32-bit IDL from a
64-bit installation
The software installer builds a Java bridge configuration file specific to 32-bit or 64-bit
platforms. When running 32-bit IDL from a 64-bit installation, the Java configuration file
does not work and IDL issues an error message that it cannot initialize the Java bridge.
This affects the ENVI "Chip to Geospatial PDF" feature.
Installation error on Windows platforms: "Key not valid for use in
specified state"
Some customers have reported this error during the installation process. It is caused by a
Microsoft update (KB2918614), which affects the Windows installer service. Workaorund:
uninstall this Microsoft update. For more information, see the Microsoft
Community website.
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Fixed Issues
ID Description
ENVI-48044 ENVI could not animate a sequence of layers or bands.
ENVI-68875 Decision Tree did not update results.
ENVI-67602 AVNIR-2 data were not accurately georeferenced when using JAXA RPCs.
ENVI-69964 Toolbox and Layer Manager did not horizontally resize while docked.
ENVI-69923 Default bands changed in image display when the Edit Header tool was
open and closed.
ENVI-69872 Convolutions and Morphology dialog did not have a Queue button.
ENVI-69843 ENVI did not have spatial bookmarks.
ENVI-69689 FLAASH issued error message with large files: "POINT_LUN Negative
position argument not allowed."
ENVI-68930 ENVI should support the Esri 10.1 projection engine.
ENVI-68862 Slovenian geographic transformations were incorrect.
ENVI-70130 ACE calculation should be mean-centered and have an option to include the
sign component.
ENVI-70071 Documentation had incorrect PIXELSTATE keyword name for
ENVIRaster::GetData.
ENVI-70064 Updates to CLASS COLORS metadata did not take effect in Layer Manager.
ENVI-70051 ENVICoordSys documentation code examples were incorrect.
ENVI-70042 Multi-byte band names displayed incorrectly in the Layer Manager and Data
Manager.
ENVI-70038 New spectral libraries were not documented in the ENVI Help.
ENVI-70015 The Esri projection engine did not return an entry for
GCS_WGS_1984_Major_Auxiliary_Sphere.
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ENVI-70002 RPC Orthorectification "Advanced Options" documentation needed better
clarification.
ENVI-69996 Setting an open-ended ROI threshold produced an incorrect pixel selection.
ENVI-69870 ENVI shifted DTED files by half a pixel.
ENVI-69857 Regridding was incorrect with data containing bad data, data-ignore values,
or NaN values.
ENVI-69847 ENVI did not open NITF files with a custom GEOSDE projection in the API.
ENVI-69733 Home and End keyboard keys produced the opposite effect for ENVI toolbar
sliders.
ENVI-69717 ENVI displayed artifacts along the border of SICD multi-segment images.
ENVI-69706 The Snail Trail did not properly reset after closing all layers in a view.
ENVI-69698 ENVI needs to support the new JGD2011 datum for Japan.
ENVI-69604 Shortcuts conflicted with pre-defined shortcut definitions for text
annotation.
ENVI-69562 The "Replace selected cells with value" option did not work correctly with
View/Edit Attributes.
ENVI-69504 ROI subsetting with ENVIRasters did not work when the ROI was projected
to a spatial reference.
ENVI-69462 Issuing a .RESET_SESSION command crashed IDL if ENVI was building
pyramids.
ENVI-69398 R/G/B check boxes in the Change Color Table dialog should be radio
buttons instead.
ENVI-69168 Calling ENVI::OpenRaster() on some external formats multiple times
resulted in an error message.
ENVI-66801 The Overview could not be selected when first switching to a view.
ENVI-66055 Users should be able to set preferences in the API.
CLASSIC-
49097
SPEAR tools should check if the default output directory is writeable before
processing.
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CLASSIC-
68532
The Seamless Mosaic tool issued error messages with some TIFF images.
CLASSIC-
66760
ENVI Classic crashed when opening seven-band ERDAS Imagine files from
a geodatabase.
CLASSIC-
59642
ENVI needs a bookmark system to save locations of interest in a scene.
Backward-Compatibility Notes
These items pertain to the ENVI application programming interface (API):
ENVITaskParameter: the DIRECTION property now returns INPUT or OUTPUT. In
previous releases, it returned IN, OUT, or IN/OUT.
ENVIRPCOrthorectificationTask: the options for the
DEM_IS_HEIGHT_ABOVE_ELLIPSOID property are true or false. In previous
releases, the options were 0 or 1. The OUTPUT_INTERPOLATION_METHOD
property was renamed to RESAMPLING. It uses string values instead of integers.
ENVIReprojectGLTTask: the options for the POLAR property are true or false. In
previous releases, the options were 0 or 1.
ENVIRadiometricCalibrationTask: the CALIBRATION_TYPE and
OUTPUT_DATA_TYPE properties use string values instead of integers.