Questions tagged [envi]
A remote sensing and image analysis software package produced by Exelis Visual Information Solutions (Exelis VIS).
296 questions
0
votes
0
answers
10
views
ENVI Random Forest ROI file causing crash
I am trying to run the ENVI Random Forest Classification tool. I know there are better ways to set up a Random Forest classifier, but as this is the software provided for the course I am doing, I need ...
0
votes
0
answers
8
views
OOB Statistics for ENVI Random Forest Classifier
I am running the Random Forest Classifier in the ENVI Machine Learning module. In the settings, there is a tick box for Out-of-Bag (OOB) Score. When you hover over the OOB Score text it says, "...
0
votes
0
answers
28
views
How to resolve ENVI Flaash ACC error
I am currently preprocessing aster radiance at sensor(level 1b) images which I downloaded as .tif files, and can be accessed via this link from Earthdata. These are radiometric and geometrically ...
0
votes
0
answers
12
views
ENVI change fontsize in panels
I'm a newbie to ENVI 6.0. I have bad vision. The text in the panels is way too small, but I can't find where to change the font size in the panels (lots of other places, but not there).
Can anyone ...
- 101
0
votes
1
answer
120
views
Python notebook causing ArcGIS Pro to crash
On my laptop are student licenses to ArcGIS Pro 3.2, ENVI 6.0 and Agisoft Metashape 2.0.3. I'm in an intro to GIS programming class and when I try to open a Python notebook in ArcGIS Pro (from the ...
- 1
0
votes
0
answers
36
views
Classification in ENVI
I classified multiple images using ENVI modeler and I would like class statistics for each image. Is there a task available in ENVI modeler that can do this? I know I can right click each image and ...
- 1
0
votes
0
answers
46
views
ENVI 5.6.2 HSV problem
I've used ENVI a lot in the past, but am a bit rusty. I have never ran into this problem and can't find anything online about it. I'm trying to do HSV sharpening with 3 band multispectral data and a ...
0
votes
0
answers
38
views
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 ...
0
votes
0
answers
206
views
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 ...
0
votes
1
answer
86
views
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. ...
0
votes
0
answers
93
views
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 ...
- 23
0
votes
1
answer
58
views
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 ...
- 1
0
votes
1
answer
193
views
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 ...
- 35
1
vote
2
answers
90
views
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 ...
- 13
0
votes
1
answer
592
views
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: ...
1
vote
0
answers
376
views
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 ...
user168625
0
votes
1
answer
811
views
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-...
0
votes
0
answers
289
views
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....
- 1
1
vote
0
answers
50
views
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?
- 141
1
vote
1
answer
518
views
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 ...
- 11
0
votes
1
answer
242
views
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 ...
- 11
0
votes
0
answers
138
views
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 ...
2
votes
1
answer
145
views
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?
- 151
0
votes
0
answers
73
views
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 ...
- 151
1
vote
0
answers
52
views
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
...
- 151
0
votes
0
answers
189
views
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 ...
- 151
0
votes
0
answers
234
views
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 ...
- 43
1
vote
1
answer
867
views
GeoTIFF to ENVI GDAL translation causes rotation
I have a GeoTIFF(you can download it here ~16MB) which I want to convert to ENVI raw. I'm using this GDAL command:
gdal_translate -ot UInt16 -scale -of ENVI -outsize 1025 1025 dgm1_32372_5680_2_nw.tif ...
- 157
1
vote
0
answers
267
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- ...
0
votes
1
answer
271
views
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 ...
1
vote
1
answer
1k
views
Merging 7 Satellite Images into 1 Image
I want to join 7 images [that is in .tiff] and merge and than subset the area using shapefile. But i am not able to merge it. I have loaded the images as raster layer and than merge it Using Qgis and ...
- 55
0
votes
0
answers
79
views
Rescaling MNDWI to normalize
This statistic report shows the scale after done the MNDWI index process by using software ENVI 5.1.
Normally expect result have to be -1 to +1 scale.
How to get which scale?
0
votes
1
answer
74
views
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 ...
1
vote
0
answers
152
views
Enhance Vegetation Index ( EVI ) equation in ENVI IDL [closed]
I'm using ENVI 5.3 to find EVI, when I'm applying the equation it doesn't run, anybody can provide me the exact equation or formula for running the index. For more clarification, I'm using Landsat 8 ...
- 11
1
vote
1
answer
473
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
...
- 21
1
vote
0
answers
204
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 ...
- 11
2
votes
1
answer
4k
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 ...
- 61
1
vote
0
answers
84
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
vote
0
answers
315
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
...
- 13
0
votes
1
answer
212
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 ...
- 1
0
votes
3
answers
484
views
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 ...
- 140
0
votes
0
answers
957
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). ...
1
vote
0
answers
662
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 ...
- 11
3
votes
0
answers
76
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 ...
- 319
0
votes
1
answer
262
views
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 ...
- 1
0
votes
2
answers
496
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?
1
vote
0
answers
101
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
vote
1
answer
467
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.
...
- 1,449
2
votes
2
answers
1k
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/...
- 117
0
votes
1
answer
1k
views
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 ...
