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Questions tagged [envi]

A remote sensing and image analysis software package produced by Exelis Visual Information Solutions (Exelis VIS).

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7 views

Is it possible to convert the SPECPR spectra files in to envi readable format?

The SPECPR files available with USGS spectra files are readable using the plugins which are tested with envi. specially envi 4.5 and 4.8. how ever is it possible to convert the full spectrum of specpr ...
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12 views

Landsat 8 Level 2 products. Converting Pan & Thermal bands to spectral reflectance

We have downloaded around 20 Landsat Level 2 Surface Reflectance scenes for our AoI. The processed bands available in the downloaded scenes are, as you people know - Aerosol,B,G,R,NIR,SWIR,Cirrus. ...
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6 views

Normalizing a single band of landsat 8 imagery w.r.t an adjacent one

We have 23 landsat 8 level 2 imageries which has to be mosaiced. Based on date, we have mosaiced individual bands (B1, B2, B3, B4, B5, B6) and now it's down to 5 imageries. But we are not getting a ...
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2answers
64 views

Read aviris data with python

I try for too ling to read the envi file in python. Normally this is very easy. First, I extract necessary values from the .hdr: for line in open("../../local_storage_only/aviris/...
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1answer
16 views

Finding sericite alteration in ENVI 5.3 spectral library?

I work on an area where there is a sericite alteration and i searched for the sericet and did not find a word. I want to know what is called sericet in the spectral library of ENVI 5.3? Sericite is ...
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1answer
43 views

How to 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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1answer
35 views

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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1answer
41 views

Pleiades atmospheric correction

I have phr1a and phr1b images (Pleiades) and I need to make atmospheric correction. First, I tried to do this by using Envi FLAASH. by the way, I tried also ERDAS atcor but there was also same ...
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1answer
65 views

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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1answer
34 views

ENVI 5.1 - ANN Classification - Background was classified into one of the class

I'm new to Remote Sensing and I'm having trouble in ENVI 5.1 where the background was classified as one of the classes in the ROI I used, which is not right. How can I exclude the background or at ...
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1answer
146 views

Radiometric, reflectance and atmospheric correction for Landsat 8 image

I am struggling with the pre-processing process for landsat8 imagery. I want to use some indices (e.g. NDVI, SAVI, EVI, NDMI) and create a land cover map at the end using ENVI and ArcGIS. As a ...
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1answer
32 views

“BAD_ALLOC Memory” PSI on ENVI

I'm currently working on S1-images, and I want to process PSI on them. I use ENVI 5.5 with SarScape. Here are the steps I followed : I opened 23+1 images (Import Data) and I cropped them using SAR ...
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1answer
77 views

I can apply tasseled Cap transformation in surface reflectance (not ToA)?

I can not understand if I should adjust the Tasseled Cap index with the surface reflectance values or the Top of Atmosphere
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0answers
23 views

Zenith and Azimuth Angles of OLI sensor of Landsat 8 [duplicate]

I am working with l8. How i can calculate Zenith and Azimuth Angles of for Landsat 8?
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0answers
41 views

When to rescale reflectance data to calculate vegetation indices

I'm attempting to calculate a number of vegetation indices using hyperspectral AVIRIS data in ENVI. Some of these indices are normalized, such as NDVI, whereas others are not, such as the Transformed ...
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112 views

Converting SPOT 6 and 7 DN to Top of Atmosphere Radiance/Reflectance for use in envi

I am used to working in envi, but I do not really understand using SPOT image data. I have obtained SPOT 6 and 7 image data in order to convert the DN value to reflectance value for use / analysis in ...
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1answer
104 views

Using COSI Corr Interior Orietation Fiducial Marks in UAV Imagery?

I am working on COSI Corr an ENVI Plugin, i am using it for Landslide Displacement using UAV Imageries. How do I select fiducial marks? I dont know what does it mean by "X loc (pix) and Y loc (Pix) ...
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1answer
24 views

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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12 views

ENVI Example Based FX segment selection slow

I am using the Example Based FX workflow in ENVI 5.5 and the segment selection tool is extremely slow. It used to be fairly fast but now takes a long time (30 seconds or more) to process one small ...
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0answers
79 views

ENVI seamless mosaic incorrectly altering data?

I'm using ENVI 5.2 build 9/28/2014. I'm using AVIRIS data and calculated a vegetation index for six adjacent flight lines. For each individual flight line I know I calculated the index correctly, ...
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0answers
43 views

NoData and Multiband Calculations

I was recently trying to perform some band math calculations in multiband images. I have a big chunk of images witch contains more than 300 bands (dates) each. So I first choosed ENVI to do this ...
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82 views

Creating shapefile for ENVI in MATLAB

I am new to ENVI. I want to create a shapefile in the Matlab and export into ENVI. I used the MATLAB shapewrite(data,'ROI.shp'). It generated shapefile, but when I uploaded to ENVI it didn't show ROI. ...
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67 views

Endmember batch processing in ENVI - linear spectral unmixing

I am trying to run linear spectral unmixing on a few hundred Landsat images. I am using this Harris Geospatial ENVITask example as a basis for batch processing these images. However, I want to select ...
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61 views

Using the Triangulation Method in ENVI's Gapfill tool

There is tool in ENVI, Landsat gapfill , is there any documentation on how the triangulation method works? Can anyone please explain how that particular method works in landsat gapfill tool?
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1answer
664 views

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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91 views

masking in ENVI [closed]

I have surface reflectance generated NDVI which I got from ESPA interface, https://espa.cr.usgs.gov. How do I mask cloud with Qa band in ENVI?
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31 views

white image while Trying to mosiac two hyperspectral data in ENVI

I am trying to mosaic two aviris-ng georefrenced hyoerspectral data but one of them become white in preview. so I am not able to mosaic the image.enter link description here error ink
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0answers
39 views

Applying a mask when running MESMA using VIPER tools plugin for ENVI

I am running MESMA on a landsat image that has large areas masked out, but I keep having all the background (value = 0 in all bands) pixels included in the analysis. They all end up unmodeled (no ...
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0answers
292 views

Atmospheric Correction of Sentinel-2 using QGIS

How can I get the ENVI output format from the Sentinel-2 images after Atmospheric Correction in QGIS ?
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1answer
132 views

Is it required to do DOS using Sentinel 2 image for land cover change detections

Sentinel 2 imagery is already ortho-corrected and georeferenced. However I wish to know how important it is to correct further and which correction to carry out.
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161 views

Confusion Matrix for a binary raster

I have a raster GeoTIFF with two classes (1 and 0) which was produced with gamma from a SAR image, so therefore no "real" change detection because it was classified based on texture characteristics. ...
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1answer
33 views

Direct input of Bias and gain value?

I have facing a problem on arranging the SAM Classification on ENVI. I applied the Landsat 8 and want to classify the area using SAM on my private libraly, thus the system notice that for band 9 to 11 ...
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85 views

Exporting region of interest (ROI) from scatter plot in ENVI

I have a scatter plot of LST (y-axis) amd NDVI (x-axis) on ENVI 5.3. I selected some points from the distribution as a region of interest. When I export the ROI, I found only the value of Y. However, ...
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0answers
106 views

Supervised classification using endmember spectra (using ENVI 5.1)

We are trying to map land cover classes over a small watershed. We have selected training sites (during a field campaign in early 2017) and determined their spectral profiles on a Landsat 8 image ...
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1answer
153 views

Apply mask in bulk ENVI

I have a stack of MODIS images consisting of 400+ bands. A stack of NaN masks is created corresponding to each layer of the MODIS stack. I wonder if there is a way to apply the mask layers in bulk in ...
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1answer
93 views

Why ENVI IDL writing gifs upside down?

I have a binary classification file shows urban areas. I need to convert this file to 8 bit unsigned integer GIF format. ENVI can't save images as GIF so I've used IDL and write a few lines to ...
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1answer
231 views

How to export latitude and longitude values of each pixel corner? [closed]

I want to extract latitude and longitude values for each pixel's corner of a TIFF image. The latitude and longitude values for the top right and top left are known. How should I perform this task in ...
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2answers
116 views

NDVI from ENVI to Arcmap stretched value

I calculated NDVI in ENVI by band math. When I drag and drop the image in ArcMap it becomes a black image with stretched value =0 for all pixels. However, by identity clicking each pixel has a value ...
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1answer
107 views

Batch ENVI IDL PointCloudFeatureExtraction results in unprocessed areas [closed]

I have an IDL-ENVI code to batch PointCloudFeatureExtraction for lidar tiles across a large area, however, when run, the output results in lower areas of each tile as "unprocessed". So my question is ...
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1answer
287 views

Generating confusion matrix using classified image with geotiff format?

I am working on yielding a confusion matrix with importing an image which is a geotiff format. After classified by a python program, The image has two values (two classifications). However, when I ...
1
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1answer
77 views

Again Band swap when reading created image with Gdal

As previously seen here I created a function to save a raster with gdalon python: def array2raster2(fname, rasterOrigin, pixelWidth, pixelHeight,array, proj, shape): originX = rasterOrigin[0] ...
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1answer
164 views

Topographic correction in ENVI

I work with LS8-data in a mountainous area where the illumination is poor especially in the winter months. My thought is to use either a shadow mask or apply topographic correction. I will use all ...
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0answers
101 views

Scaling surface reflectance product in ENVI?

I am using ENVI 5.4, specifically 'Data Stretch' tool in a bid to scale down my Landsat 8 OLI surface reflectance product values. I have populated the dialogue box (as below) and compared the ...
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0answers
90 views

Removing “Bow-tie deletion line ” from my raster dataset

I am working on VIIRS SDR dataset where I have created geolocated and projected raster of "BrightnessTemperature" using "Latitude" and "Longitude" dataset given in HDF5 format using ENVI. Now my study ...
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0answers
22 views

Register an image using mutual information

I want a procedure for registering two images based on their mutual information. I took a pair of georeferenced radar images of the same location, edited the metadata of one so its position was off by ...
1
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1answer
461 views

Convert netcdf file to tiff (with spatial referencing information preserved)

I was trying to convert a netcdf file (~5 GB in size) to a tiff format using both Gdal_translate and ENVI. Was successful in ENVI but I'm missing spatial information. Using gdal_translate (...
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0answers
64 views

Interpretation of local incidence angle map obtained from ENVI

I obtained a Local Incidence Angle (LIA) map from ENVI while geocoding an ALOS satellite SLC image. It is said in the documentation of ENVI that the LIA map (in .tiff format) contains the angle at ...
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0answers
176 views

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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1answer
513 views

TypeError: 'BilFile' object does not support item assignment

I want to use Python and Spectral library to open a hyperspectral image as ENVI file (.hdr + .dat), rewrite some bands and then save the file in the same format. I have problem with this: "...
2
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1answer
123 views

Opening rrd file in ENVI 5.3

I have three files with RRD extension, which are data files for ASTER and I do not know how to open them in ENVI 5.3?