Questions tagged [envi]

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

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7
votes
1answer
366 views

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,...
4
votes
1answer
335 views

Identifying pixels with sun glint in a satellite image (for atmospheric correction)

Wondering if anyone knows a way (perhaps objective) to identify pixels that are infected with sun glint in an image. I'm using Hedley's 2005 approach in a python to deglint my image but this approach ...
3
votes
0answers
55 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 ...
3
votes
1answer
340 views

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 ...
3
votes
0answers
321 views

Import GPS SINEX (for velocity analysis) into Sarscape or processing with others software

I try to import GPS snx. into Sarscape 5.2 (use GPS Import tool) and getting error 115) ) gps_type : [sinex] 116) ) generate_kml : [OK] 117) ) generate_shape : [OK] 118) ) ...
2
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0answers
34 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 ...
2
votes
1answer
232 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 ...
2
votes
2answers
2k 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 ...
2
votes
0answers
157 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 ...
2
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0answers
33 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 ...
2
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0answers
239 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 ...
2
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0answers
180 views

ENVI shows colors of different RGB code the same in a bitmap image wrongly?

As you see in this picture which I've captured in MATLAB, there are two colors. Red with the RGB code (255,0,0) Brown with the RGB code (138,139,1) I've tried to show the same picture in ENVI, ...
2
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0answers
337 views

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)...
2
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0answers
315 views

DSM and buildings height

How can I create a Digital Surface Model in order to collect the height of buildings and what's exactly needed to create a Digital Surface Model? Any software provide creating it (ENVI or PCI ...
2
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0answers
148 views

Producing a high-res jpeg with grid from GEOTIFF and Shapefile in Python

I have a bunch of 4-band GeoTIFFs that I would like to save as high resolution JPEG images. But, in the output image, I also need a separate point .shp to be overlayed and labeled with one of the ...
2
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0answers
35 views

Snapping vectors to vertices for ROI delineation?

I am trying to manually extract a set of ROIs in ENVI 5.0. However, I can't seem to successfully line up the vector to be flush with the boundary of the pixels, which means I don't have fine-tune ...
2
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0answers
563 views

Interpolating values for NaN pixels using ENVI?

I'm currently using MODIS data and am running into problems with NaN values in the final product caused by clouds. I'm interesting in a simple way to spatially interpolate (fill in) these NaN values. ...
2
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0answers
1k views

Resample Landsat 8 to 60m Resolution

I have two Landsat images for the same study area. One of them in 1975 (Landsat 2 MSS with 60m resolution) and the other in 2014 (Landsat8 OLI with 30m resolution). I want to do change detection ...
2
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0answers
95 views

How to overlay Radiance (Top-of Atmospheric radiance) over Digital Numbers Image?

I am trying to process INSAT-3D images, which contain six different bands. I have to extract each and every band form the .h5 data file, so when I extract first band (MIR) band form the data set, I ...
2
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0answers
62 views

“Back calculating” to quantify the “atmospheric effect” of water vapor or other gases in a “corrected” hyperspectral image using QUAC?

I know that when using FLAASH in ENVI, you can produce a water vapor map (caveats considered) from your atmospheric correction. My question is if it is possible to "back-calculate" a water vapor map ...
2
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0answers
398 views

ENVISAT ASAR .N1 file is not being opened by ERDAS IMAGINE 2011

I am not able to open ENVISAT ASAR .N1 file in ERDAS IMAGINE 2011. The software has direct read option for files of this format. Whenever I try to open the file, software closes automatically giving ...
1
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0answers
29 views

Cloud Shadow interferring with NDWI Analysis

I'm working on surface water identification in Northern Kenya. I'm using Landsat 5TM and Landsat 8OLI data in ENVI 5. I've masked clouds using the QA band (although have also tried the fmask tool- ...
1
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0answers
25 views

Map info extraction ENVI header

Does anyone have any idea about getting the map info from an ENVI header file? This is my file.hdr as shown in the text editor: ENVI description = { C:\xxxx\yyyy\Desktop\filename.} samples = 36000 ...
1
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0answers
33 views

GEMI vegetation index calculation in ENVI

I want to calculate gemi index, but I can't write its formula in ENVI, this doesn't work. gemi formula is: (n(1−0.25n)−RED−0.1251−RED) n = ( 2 * ( NIR ^2 - RED ^2) + 1.5 * NIR + 0.5 * RED ) / ( NIR ...
1
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0answers
37 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....
1
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0answers
48 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 ...
1
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0answers
288 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 ...
1
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0answers
35 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 ...
1
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0answers
104 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 ...
1
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0answers
20 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 ...
1
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0answers
48 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
1
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0answers
55 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 ...
1
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0answers
123 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, ...
1
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0answers
184 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 ...
1
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0answers
92 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 ...
1
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0answers
60 views

Automate band combination process

Everytime I get a new scene, I have to build a specific number of band combinations. It's almost 50 band combinations. I have to do it for almost every scene, over and over. Is there any automatic ...
1
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0answers
107 views

Applying mask to 40 Landsat images on ENVI?

I'm new to ENVI and am working on a time series for a section of the Santa Barbara Channel. I have a mask I made from the ROI tool, but was wondering if there is an efficient way to mask all 40 of ...
1
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0answers
89 views

Endmember selection when applying SAM, SVM and MLC to PCA

I intend to apply the Spectral Angle Mapper (SAM), Maximum Likelihood (MLC) and Support Vector Machine (SVM) algorithms on a hyperspectral dataset in ENVI but I am slightly confused as to how to ...
1
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0answers
101 views

Understanding ENVI images Display mode

A Sentinel-1 image shown in ENVI is 41% in scale(Fig.1,normal) and 51% in scale(Fig.2, unnormal with mussy in black or white dots). I don't know the reason for the situation, the pyramid-building ...
1
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0answers
278 views

Opening ENVI files in ArcMap?

I have calculated NDVI (vegetation index) in ENVI 5.2 and I saved it in TIFF format. Now I am trying to open it in ArcMap, but its not opening properly. The image is total black and the values are ...
1
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0answers
92 views

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 ...
1
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0answers
60 views

Make Chessboard stack Image

I am learning some literature of works and came across a beautiful representation of image in chessboard form. That misaligned is not my current concern. We are group of bachelor students and are ...
1
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0answers
207 views

Error when trying to edit the header of an envi file?

I have a file with the following Metadata in Envi 5.3 when I click on Edit Metadata or when I try to access the option through Raster Management > Edit ENVI Header, I get the error: Does ...
1
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0answers
93 views

Projecting VIIRS EDR Data

Does anybody know of a software that can project VIIRS EDR products. I used ENVI 5.3 to project vegetation index products available on NOAA CLASS but ENVI project the images in a weird way. The two ...
1
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0answers
225 views

Value of longitude of central meridian for sinusoidal projection

I am trying to project a PDS 3 dataset into sinusoidal projection using ENVI. How do I calculate the longitude of central meridian value? It is required for projecting the dataset. I have four ...
1
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0answers
379 views

Atmospheric correction using FLAASH

I want to run atmospheric correction on my Landsat TM5 picture using FLAASH (ENVI 4.8) but when I input radiance image (BIL format) into it, then this message is shown: "Enter ASCII filename ...
1
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0answers
242 views

Mosaic Worldview images

I have 4 tiles of worldview images. in some part of each image they overlap each other. I would like to have a single output having them all together. As far as I know I should Mosaic them, right? I ...
1
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0answers
70 views

How to make LISS-III image coloured

In order to study land use and land cover change from LISS-III images I want to see the image coloured (i.e. false-colour composite RGB) using ENVI 5.0. What is the procedure?
1
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0answers
188 views

Difference between radiometric correction at surface and at sensor in ENVI

I want to ask you about the difference between the radiometric correction at surface and at sensor in ENVI software, I do the two in flash and radiometric correction and the results was same image. ...
1
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0answers
143 views

Hard wood tree and Soft wood(shrubs) Vegetation Differentiaton

How I Differentiate Hard wood tree (like Mango, Sal) and Soft wood(shrubs like reed) Vegetation using Multispectral or Hyperspectral Image? I have TM, ETM, OLI, Hyperion, Aster Image and ERDAS 2011, ...