Questions tagged [envi]

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

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22 views

Is there a Post-classification Majority Analysis feature on Google Earth Engine (Similar to ENVI)?

In ENVI there's a Majority/Minority Analysis function that allows you to to change spurious/"wrongly classified" pixels within a large single class to that class (it also allows you to enter kernel ...
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12 views

Co-registering multiple temporal orthomosaics?

I have multiple (19) orthomosaics of the same approximate region taken regularly over the course of a couple months with a UAV. Some, but not all, include ground control points we placed in the scene....
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11 views

Creating a subset in ENVI Classic

I'm new to using ENVI Classic so this question might seem basic. I want to create a subset of 2000 by 2000 pixels of a bigger image. I understand that I should use the ROI tool, but how do I specify ...
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16 views

Understanding SNR Test Results

I am working with to images in ENVI that were taken with the same sensor. I have run SNR Test for them using to targets, dark and light. The SNR calculation was using this formula for each target- ...
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17 views

Scaling factor for MODIS (MY09GA 006 or MYDTBGA 006) product for timeseries data

I was using Modis data (MYDO9GA) product for my research and I was following this document as a user guide. https://landweb.modaps.eosdis.nasa.gov/QA_WWW/forPage/user_guide/MOD09_UserGuide_v1.4.pdf ...
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26 views

How to increase memory and CPU allocation for ENVI Graphic User Interface (GUI) Classic

Long time reader, first time writer. I want to know if there is a way to increase the memory and CPU used/allocated by ENVI 5.5 classic in the GUI. Both 32 and 64-bit versions are only using around 20%...
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1answer
48 views

Converting ENVI grid to Esri shapefile?

I have build geographic coordinates grid for raster in ENVI. It can be saved in grd format only, but I need shp (shapefile) format for opening it in ArcGIS Desktop or MapInfo. Does anyone know how ...
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23 views

Checking Spectra of image from Google Earth Engine in ENVI?

I download image on GEE from sentinel and it seems to work, but when I take the TIF image and upload it to ENVI and check the spectra, I get weird spectra. I know that the area that i'm checking is ...
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1answer
31 views

Mosaicing of multitemporal Sentinel-2 images

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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21 views

Matching endmember spectra to library spectra in ENVI using spectral analyst

I am working with hyperspectral M3 chandrayan image. I have done spectral hourglass wizard in ENVI for water ice detection in lunar region. But the endmember spectra is not similar to spectral library ...
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41 views

gdal_translate not recognizing file format [duplicate]

I am trying to convert a .dat file to a .tif file using gdal_translate. The .dat file comes with an associated .Hdr file of the same name with the metadata (these are geospatial data from SNODAS). ...
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10 views

How to calculate true reflectance from M3 data?

I am working with chandrayan 1 M3 data,that is refelectance data.I am trying to calculate true reflectance of shadowed region. Can it be done using ENVI software? If not ENVI than any other method by ...
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18 views

Why the Masking in ENVI does not give different statistical result

I want to run statistical band correlation of an image in ENVI. The image has been masked with polygon of interest, and shows no-data value outside the polygon. I expected that it calculated only the ...
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110 views

Planetscope images atmospheric correction

I have downloaded an image which is level 3B processed (so I already have surface reflectance), but my assignment is to compare the data values of the SR file with my results. At first I applied ...
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19 views

Stacking lidar-derived height raster as ancillary data for segmentation in ENVI?

I get a a black and white image after following these steps. Does anyone know why I'm not getting a color aerial image beneath the mask? My setup consists of these steps: I mosaicked several NAIP ...
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34 views

How do I remove the black background of ASTER in Envi Classic 5.3 “display window”?

I want to change color or remove black bacground of my aster imagery when "save image as" from display window (that loaded as RGB to display.. is there a quick way to do it? here is the what i ask in ...
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2answers
148 views

Explaining ENVI equations?

Could you please explain the meaning of this equation: (b1 le 0) * 0 + (b1 ge 10000) * 1 + (b1 gt 0 et b1 lt 10000) * float (b1) / 10000 b1. What do ge, gl etc mean?
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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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1answer
74 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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10 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
129 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
31 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
180 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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54 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
94 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
149 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
86 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
269 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
50 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
101 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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69 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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1answer
143 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
35 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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18 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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46 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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2answers
969 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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132 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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41 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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43 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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1answer
161 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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1answer
43 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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0answers
101 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
135 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
219 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
147 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
335 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
150 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
113 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
349 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 ...
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1answer
82 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] ...