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

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9 views

Why rescaling disturbs Band Order of FLAASH derived Reflectance image?

I have derived Reflectance values (MS bands) by calibrating Landsat8 OLI using ENVI's FLAASH module. The outcome of the FLAASH derived Reflectance values are scaled by 10,000 (by default), The reason ...
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29 views

How to classify difference 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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2answers
25 views

Reclassifying Landcover Raster in ENVI 5.3?

I have produced 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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18 views

Creating raster image using Shapefile in ENVI?

I have shapefile containing polygon boundaries and want to change them as a raster image in ENVI 5.3. Although, this could easily be done in ArcMap or other GIS software, however, I will have to ...
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11 views

Facing “unknown sensor error” in using Alos Polsar 2 (Geotiff format) at ENVI 5.3

For calculation of Radar Backscatter for Alos 2 (2015) whit Geotiff format via ENVI 5.3, I faced following error: "The target file does not appear to be a valid sensor type" The question is; how ...
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2answers
19 views

Installing Viper tools for ENVI?

How can I install the VIPER TOOLS plug-in (for Multiple Endmember Spectral Mixture Analysis) in ENVI 5.1 (and later ENVI versions)? I have failed to complete the process following the VIPER TOOLS 1.5 ...
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2answers
37 views

Removing black background in ENVI

I am trying to compare two DEM products ASTER and SRTM v.3, but the ASTER has the black background which i think will interfere with my analysis. I don't have access to ArcGIS where I can do this ...
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15 views

Hydrocarbon Index in eCognition

I would like to use the Hydrocarbon-Index from Kühn, Oppermann, Hörig in eCognition. Formula for Envi: HI=2(float(b3-b1))/3+b1-b2 So I imported a Hyperion Dataset and try to create an arithmetic ...
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12 views

How to snap 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 ...
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26 views

How to set background value as transparent in ENVI 5

How might I set the nodata/background value as transparent in ENVI 5.0? I know that I can edit the header of the file and set the "ignore value" field, which I tried (setting the field to ...
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12 views

atmospheric correction using Envi FLAASH

I'm using FLAASH for atmospheric correction in envi. an error comes up as shown in the picture. Does anybody know what's wrong with that? It is difficult for me to describe the information in the ...
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17 views

abnormal DN value after atmospheric correction

I'm using QUAC for atmospheric correction in ENVI (with data after radiometric calibration), but all DN values are 0 in the result. Does anybody know what's wrong with that?
2
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1answer
36 views

LANDSAT 8 Resolution too low for coastline difference measurement?

I recently extracted coastlines (for my master thesis) for a Bangladesh region for the years 2013 and 2014. Regardless of the method I used, the distance between the 2 coastlines was always the same: ...
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2answers
39 views

Modis MOD11A1 band math expression

I am trying to calculate the temperature of MOD11A1 and I can't find the expression of band math. How the expression temp < 273 could be written at band math?
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24 views

Inserting scale bar in ENVI without resolution loss

I am currently using ENVI version 5.3.1 and am trying to insert a scale bar to the image, in addition to the north arrow already provided by default. I have tried searching on how to do this with most ...
2
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1answer
90 views

Extract coastline as a vector from landsat 8 imagery?

I am trying to detect some sea level rise/fall for a specific region, from Landsat imagery. I went through the recommended methods of identifying water/land (MNDWI, AWEI, Bandratio 5/2, etc.). Now ...
2
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1answer
38 views

Converting an ENVI raster as point shapefile for editing in ArcGIS?

I have an ENVI raster with multiple classes inside. I tried to export this to a vector so that I can convert it to a shapefile in ArcGis (I want to manually edit/delete points in the raster), but the ...
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2answers
84 views

How to spatial subset (clip) TerraSAR-X SSC data (.cos) using vector files and one of the softwares (ENVI, PCI Geomatica, Erdas Imagine, etc)?

I have SSC data of San Francisco which I have extracted their extent as a KML file using: SARscape > Import Data > SAR Spaceborne > TerraSAR-X Then through some operations in ArcGIS, I have ...
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17 views

How can I find pixel spacing in azimuth and range and look angle from envi sarscape?

I have a quad-pol ALOS-PALSAR dataset, which I have read using Envi SarScape. Now I find to read the header or where the following information is written: pixel spacing azimuth pixel spacing slant ...
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20 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?
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49 views

Maximum Likelihood Classification in ENVI

I am a new ENVI user and I am trying to perform a supervised classification of a Landsat 8 image with the maximum likelihood algorithm. In order to run the classification, I have to insert a Scale ...
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30 views

How to sync ENVI image window with Google Earth Pro?

I am unable to find documentation explaining how to sync an view in ENVI with Google Earth. I am zooming in and out of a RapidEye image in ENVI for an object-oriented classification and it would be ...
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1answer
62 views

Estimation of Land Surface Temperature using ENVI 5.2

I am doing research about land surface temperature using Landsat 8 image. However, I have a problem with them. I have read literature but i can not do it in ENVI 5.2. Could you help me ...
4
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3answers
77 views

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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26 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. ...
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20 views

Loading a lot of raster into ENVI

I have a lot of raster in different folder and subfolder. I need to load them, because I would like to do seamless mosaic. I know the patch of each file but I don't know how to do a kind of loop that ...
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2answers
53 views

Which one is best for atmospheric correction?

My aim is to determine surface temperature extraction by computing NDVI from Landsat 7 and Landsat 8. suggest me which method DOS (dark object subtraction) or FLAASH atmospheric correction in ENVI ...
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1answer
26 views

Call Toolbox operators of ENVI from IDL code

Is it possible to call the clustering/classification algorithms included in the toolbox of ENVI (gui) from IDL (source code) and how?
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4answers
115 views

Transform raster donuts to circles

Let's assume I have a raster image consisting of 0's and several donut-shaped rings of 1's. This raster could for example be the result of classifying a satellite image with ponds and lakes in it into ...
3
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175 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) ) ...
0
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1answer
114 views

How to remove shadows from high resolution imagery (IKONOS 1M)

I have dataset imagery comes from IKONOS satellite, the dataset contains "imagery with 1m resolution - metadata - rpc file", the metadata file contains the information about "Sun Angle Azimuth - Sun ...
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84 views

Reprojecting MODIS NDVI and reading the hdf output file in ENVI

I'm working with ENVI5.3 and want to open a MODIS NDVI (MOD13Q1) in hdf format. Firstly, I used the Modis Reprojeciton Tool to reproject the modis tile. And I opened the reprojected file in hdf format ...
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3answers
292 views

Open LiDAR DEM of the UK with *.asc extension

I've downloaded a tile of a freely accessible LiDAR DEM of the UK from http://environment.data.gov.uk/ds/survey#/download. But I don't know how to open it. The files inside have the *.asc extension. ...
1
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1answer
47 views

How to create a map from separate ascii files without merging them?

I have three ascii files including longitudes, latitudes and pixel values. I just wonder whether there is anyway to display a map from the three files and save it in geotiff without merging them into ...
2
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0answers
67 views

How to interpolate 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. ...
4
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1answer
74 views

Where are the “band names” of an ENVI file once it is imported in R?

I have a .dat file (ENVI format) with specific band names, as you can see in the snapshot. I've imported this file in R, but I cannot find the band names in the R object. The command ...
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1answer
415 views

Open Sentinel-1 products using ENVI 5.3

Is it possible to open Sentinel-1 products using ENVI 5.3? GeoTiff Sentinel-1 images can be opened independently but I can't open the product (from its xml file) using ENVI. I mean, is SARscape ...
4
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0answers
34 views

What's the binary format of ENVI (Classic) ROIs?

I'm a (lonely) Pythonist in an office full of ENVI/IDL users. I've created some tools to help bridge the gap, but one big stumbling block is ENVI Classic .roi files, which my colleagues use a lot. I ...
6
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2answers
282 views

Landsat8 DN to TOA Reflectance (minus values)

I'm learning how to perform atmospheric correction manually, hence not using the automated methods available in ENVI metadata (band 1) for my Landsat 8 scene is as follows; RADIANCE_MULT_BAND_1 = ...
2
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1answer
73 views

NDVI in ENVI: Output format issue

I am working on NDVI in ENVI... the output file is in Envi Standard format... I required it in Envi Classification format, which can be done through Envi Edit Header tool... This requirement is for ...
2
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1answer
158 views

Is possible to merge landsat 8 with High Resolution Satellite Imagery?

i have landsat8 and High Resolution Imagery (1m) in the same study area, is possible to merge them to get one imagery so that i can take advantage of the accuracy satellite imagery.
2
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1answer
74 views

How to add new feature class to already classified image

I have at hand this already classified image with 8 vegetation classes. Now I would want to change a part of existing vegetation class to a NEW vegetation class, making it 9 classes. I do not want ...
1
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1answer
134 views

Enhanced Vegetation Index Value

Can enhanced vegetation index have values greater than 1? I am using the ENVI software to calculate enhanced vegetation index (EVI) of a hyperspectral image and my EVI value range was from 0 to 1.9. ...
1
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1answer
59 views

Parameter names and meaning of their values in an ENVI header file

This is the header of an Envi file: ENVI description = { PolSARpro File Imported to ENVI} samples = 8407 lines = 5569 bands = 1 header offset = 0 file type = ENVI Standard data type = 4 ...
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44 views

why ENVI displays colormap classified image as a RGB image

I want to do accuracy assessment in ENVI. My ground through image has 19 classes (Unsigned 16bit) when I opened it ERDAS and ARCGIS. But when I opened it in ENVI, ENVI displays these image as a RGB ...
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32 views

Derive individual land cover classes from .jpg map

I have a .jpg image which is land cover classification image with 9 classes. I want to extract raster image (.img file) which contains the same classes as .jpg image (9 classes too). Is there any tool ...
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69 views

Reflectance calibration inLandsat 5 TM met vs Envi Landsat Calibration tool

I am having a problem calibrating a Landsat 5 TM image to reflection TOA. I am using Envi Classic to perform the calibration in the Landsat Calibration tool. Part of the problem is the .met file only ...
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36 views

Problem using ENVI/IDL ENVITask('BuildBandStack')

I am trying to stack 2 bands together from 2 different landsat images using ENVITask('BuildBandStack'). These are landsat images from two different years, and Band 1 in both years. When I run my code ...
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51 views

How to transform ENVI Hdr to PNG using GDAL?

I am trying to transform a ENVI Hdr image into a PNG (or other RGB image format) in order to visualize this image. I am selecting the three default bands (55, 41, and 12). I am using GDAL by using ...
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55 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, ...