Questions tagged [envi]
A remote sensing and image analysis software package produced by Exelis Visual Information Solutions (Exelis VIS).
291
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Preparing raster Image for correlation in ENVI 5.5
I am working with two raster image of the same location with the same extent, both projected to the same coordinate system and having the same cell size. I want to correlate the raster value on the ...
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ENVI fmask Error for Landsat 5 data
I'm trying to mask cloud cover of multi-spectral Landsat 5 image containing bands 1-7 that have been preprocessed using dark object subtraction and Landsat calibration.
I am using the fmask tool in ...
CommunityBot
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Converting ENVI file to TIFF using ArcPy
I have ENVI files one ASCII file .hdr and a flat_binary raster file which is a file without an extension
I'd like to convert them to TIFF files
These are the steps I followed:
Rename flat_binary ...
CommunityBot
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Matching extent (samples & lines) to get multi-temporal stack
I downloaded several Landsat scenes (4x3) to create some multi-temporal stacks to see the phenological difference in April/March - mid summer - autumn. I actually use The EnMap Box which has been ...
CommunityBot
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Color correcting/balancing for mosaic hyperspectral raster images
I have two rasters (hyperspectral images with 810 bands). I need to mosaic them, and I am doing it in ArcMap using Data management tools>Raster>raster dataset>create raster dataset>mosaic. ...
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ENVI band math incorrect values
I'm attempting to calculate vegetation indices in ENVI 5.2 using level-2 AVIRIS data in band math.
The indices I'm working with are Vogelmann Red Edge 2, normalized difference red edge, and red edge ...
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996
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Make layer stacking in ENVI for Landsat 8
I downloaded Landsat image 8 and I made layer stacking for RGB layers in ENVI (Bands 4,3,2) to classify the land cover types. But the problem appeared when I conducted supervised classification.
I ...
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Specifying band combinations when loading LANDSAT MTL files in ENVI IDL?
I'm somewhat new using ENVI and have a very limited background in programming. I was asked to compile 12 RGB and NIR composites of LANDSAT scenes within a specific timeframe and would like to use ENVI'...
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Extracting NDVI values from hdr file
I have a dataset of hdr files of MYD13A2 MODIS product including 4 bands NDVI, EVI, quality, and reliability.
I want to extract the NDVI values for a group of points; I have the geographic coordinate ...
CommunityBot
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3
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Merging georeferenced images that have overlapping information?
Having trouble to mosaic two overlapping .tif files. I need to merge these two images together into one resampled raster image. Unfortunately I cannot do this with my ability and resource available to ...
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Problems trying to intersect two shapefiles
I keep having problems trying to intersect two shapefiles.
One of them is a normal file that I downloaded from geoamenagement.com. The other I created by using the classification protocol tool on an ...
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Converting SPOT 4 level 1A from TOA reflectance to Surface Reflectance in ENVI
I downloaded the SPOT scene Level 1A: Reflectance at the top of the Atmosphere, not orthorectified to use in land use and land cover mapping applications. I would like to convert them to Surface ...
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Exporting landcover clasiffication from ENVI to SAGA
I have basic knowledge in remote sensing and GIS. I have generated landcover map in ENVI 4.7. How can I transfer or Export/Import this into SAGA so that I perform other functions in SAGA. I want to ...
CommunityBot
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Opening ENVI file in R gives error
I'm new at using GIS with R and I'm trying to open an ENVI file containing hyperspectral data following the suggestions from this post https://stackoverflow.com/questions/57474186/r-how-to-read-envi-...
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Display Failure of image in ENVI
Fig.1 is the image in zoom of 15.5% ,and Fig.2 is fixed zoom in 59.0%.
Obviously,Fig.1 window fails to display.However,the image can display regularly after zooming into a certain percentage.
What ...
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Computing stats with data ignore values - ENVI classic
I'm using ENVI classic (5.4.1) and trying to compute basic statistics from a Landsat-8 scene. When I mask out certain pixels (water set to 'No Data', for instance) the built-in ENVI statistics still ...
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RPC sensor model coefficient auxiliary data structure
I am part of a college team building a hyperspectral small satellite (3U). We would like to use ENVI's orthorectification module to do ortho. However, we need to generate our own RPC or sensor model. ...
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113
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Mosaic different data Sentinel-2 L2A image with color difference
I have downloaded two L2A level sentinel-2 images at 2022-09-05 and 2022-09-07 from scihub. After subset and resampling on SANP, I used seamless mosaic in ENVI to mosaic the two scenes, and I found ...
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How to repair topology of a shapefile?
I performed an object-based image analysis using ENVI EX, and each of the classified features were exported as a shapefile. I transferred those shapefiles into ArcMap 10, and tried to intersect them ...
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Using one set of ROIs to classify multiple raster layers in ENVI?
I am attempting to run a SAM classification on an airborne hyperspectral dataset with six total flight lines, and the files are too large to mosaic before processing. Is it possible to create an ...
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Reclassifying Landcover Raster in ENVI 5.3?
I have produced a landcover raster using Landsat 8 OLI, Pansharpened image. The derived landcover classified image is placed below:
Now, I am intending to reclassify this image to change its class ...
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NDVI value from different download sources
I downloaded the Level 2 image of landsat-8 in GEE and calculated the NDVI value in ENVI. At the same time, the Level 1 image of the corresponding date was downloaded from the USGS, and the NDVI value ...
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Katalog for Envi
I am working In Process of Image Cataloging of Satellite Imagery. For That I have found Free extension software in ENVI called "KATALOG" but I cannot find any useful resources for ...
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Classifying different surfaces having almost similar Reflectance responses
I am using ENVI 5.3 to classify a Region of Interest clipped from Landsat 8 OLI. I have already performed calibration of my DNs by transforming it into Radiance and derived Reflectance image using ...
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How to read/write ENVI metadata using GDAL?
I am trying to use GDAL to read and write images in ENVI format (for example a .bsq file with an associated .hdr file). The GDAL Formats Info page states "Starting with GDAL 1.10, all ENVI header ...
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How to open FGDB raster in ENVI?
I have File GeoDatabase raster image that is combined with multi-bands and I want to do classification (ISO unsupervised) in ENVI.
How can I open a FGDB raster in ENVI?
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3
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425
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Mosaicing of multitemporal Sentinel-2 images using ENVI
My aim is to combine several Sentinel-2 Level2A images of the same location/orbit number but at different dates of a year.
I would like to have different options to create that mosaicing (e.g., if ...
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49
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FLAASH produces weird peaks
I am applying FLAASH to atmospherically correct and convert to reflectance a hyperspectral image acquired by our airborne system. The problem is that FLAASH (using ENVI) outputs an image where all ...
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3
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problems of display modis ndvi with TIMESAT
I use MODIS MRT tool mosicia tow tiles MODIS NDVI data, then use TIMESAT image view to display the mosaic data, encounting file size waring :
and after drawing data, the sequences of two tiles is ...
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NetCDF to Geotiff file conversion
How would I convert NetCDF files to Geotiff format? The data I am using is air temperature data that comes from the Climatic Research Institute and I want to display it on ENVI. I am not familiar with ...
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Error during FLAASH Atmospheric Correction
I am trying to carry out Atmospheric Correction for LISS4 data using FLAASH. Since LISS4 is not available in the sensor list of ENVI, I have made the filter function file using the spectral builder ...
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QUAC atmospheric correction for Landsat-8 (ENVI 5.0)
I try to realize QUAC atmospheric correction for the band 4 and band 5 of Landsat-8 in ENVI5.0. This version doesn’t support Landsat8 (doesn’t have parameters of Landsat-8).
At the first step I glued ...
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How to use the same ROI for multiple LANDSAT images in ENVI?
Suppose that I have 3 landsat images with the same datum ( WGS-84 ) and projection system ( UTM, Zone 39N ) as follows:
TM LANDSAT 5 image for July 1987
ETM+ LANDSAT 7 image for July 2001
OLI_TIRS ...
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73
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Digitizing photographs of a map
Is it possible to digitize the photographs of very old maps, having no co-ordinates. The photographs are exactly like this. If possible, could somebody tell me how to proceed? I have access to ArcGIS ...
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ENVI error class_doit: An error has occurred during processing Error: "LA_LUDC: Singular matrix encountered, STATUS=2." The result may be invalid
I do a Maximum Likelihood Classification in ENVI 5.3. But after the process read the ROI, then appear pop up "ENVI error class_doit: An error has occurred during processing Error: "LA_LUDC: ...
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Extracting spectral signatures from ROI using ENVI5.3
I used ENVI's Band Math functionality for calculating a certain index to find out the dominance of a mineral. The output is one monochrome band as seen below, I really need your help to learn how to ...
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Converting NTF to TIF using ArcGIS Pro in order to run FLAASH Correction
I received worldview 2 files but some are in the .ntf while others are in the .tiff format. I am able to work and FLAASH the files that are in the .tiff format but I am unable to FLAASH the .ntf files....
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Correcting effect of solar elevation angle in tagged areas for Landsat 8 L1T images using ENVI
Someone said the L1T images did not correct the effect of solar elevation angle.
I want to know how can I get the parameters for doing such correction in ENVI?
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1
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EVI and NDVI range value
I've used a Landsat 8 image for vegetation analysis in an urban area. I've got a large maximum number of EVI value as shown in this image:
Is this normal in calculating EVI and NDVI? Because I know ...
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95
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Getting pixel values from lat/long values using ENVI
I am using ENVI software to process satellite image. I have two images from two different satellites and I want to get the value of the same point in the two images. I got random points from the first ...
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Error reading envi file from zip using /vsizip and gdal in python
I am having an issue reading an ENVI binary file (with .hdr file) from a zip file using GDAL in Python and the /vsizip driver.
I know the ENVI file (binary and header) itself is fine, since when I ...
CommunityBot
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Atmospheric correction in ENVI, export to ERDAS
I am working on a project using Hyperspectral imagery and have ERDAS Imagine on my home PC and have access to ENVI on another PC at University. Is it possible, for example, to perform the atmospheric ...
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385
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Linear Spectral Unmixing in ENVI 5.3
Trying to perform some Linear Spectral Unmixing on a LandSat 7 scene. I have 6 bands, and after MNF-transformation have kept 4 of them.
I want to perform a Vegetation, Impervious surface, Soil (V-I-S)...
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1
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Designing a Low Pass Filter
How can I design a similar Low Pass Filter as given below which takes into account only 4-connectivity and ignores the pixels that complete 8-connectivity?
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LPF and HPF filters in ENVI
Since we know about convolution filter in image processing, it is basically a matrix applied to an image and a mathematical operation comprised of integers and it works by determining the value of a ...
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443
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Opening MOD17A3 in ENVI so it is properly georeferenced?
I am using ENVI 5.1 on Windows 8. I am trying to open a MOD17A3 (MODIS Net Primary Productivity standard product - L4) .hdf file which I downloaded from the USGS website. I am still a beginner at ENVI,...
CommunityBot
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Spectral signatures difference between a raw image and an atmospherically corrected image
I did atmospheric correction of Landsat 5 image by Quick atmospheric correction method(QUAC), now I want to compare atmospheric corrected spectral signatures from ENVI QUAC with the input spectral
...
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156
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Difference between two atmospherically corrected Images
I corrected Landsat 5 image with two different methods, first atmospheric correction through calibration (means converting raw image into radiance), second atmospheric correction through QUAC ...
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180
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Mosaic multiple 7gb TIFF into one big TIFF
I have data of 10 sets each with 361 channels in format of ENVI.
Each set contain:
7gb format-less file (BSQ #UPDATE)
2.4gb .ENP file
9kb .HDR file
I try to mosaic all of them in one big file.
What ...
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Planet filter file for ENVI atmospheric correction
I have 4 band Planet Scope multispectral imagery that I am trying to process in ENVI. It is the analytic data, so it is already radiometrically corrected. I have converted the .tif to a BIL, and ...
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