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

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5
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135 views

How do I open MOD17A3 in ENVI such that 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 ...
4
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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 ...
3
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0answers
26 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 ...
3
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0answers
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 ...
3
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0answers
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) ) ...
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. ...
2
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327 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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45 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
50 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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254 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
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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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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0answers
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, ...
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0answers
87 views

Atmospheric correction using ENVI Flaash

I want to perform atmospheric correction of both Landsat 7 and Landsat 8 data. I am using ENVI 4.5. What scale factor should I choose for Landsat 7 and Landsat 8? Plese suggest.
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122 views

ENVI: Postclassification, remove pixels of certain size

I did a classification over multiple Landsat imagery in ENVI 5.1, which turned out not too bad (ice and snow in Cyan in the picture below). Now I am about to do a postclassification to filter out ...
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243 views

Asking linear regression between NDVI and LST using ENVI

Here I have a problem to calculate a linear regression. I Have two images of NDVI and LST derived from Landsat 8 and want to calculate the linear regression for between them obtaining the dry edge and ...
1
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0answers
25 views

Working with Aura's OMI Data in Envi

I have downloaded Aura's OMI data from h++p://mirador.gsfc.nasa.gov website but I can not work with them..How can I open these data in envi and what preprocesses are needed for these images? Thank ...
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67 views

What is the Pro or Cons for mosaic 30 GB jp2000?

Has anyone tried mosaic jp2000 imagery in ERDAS, ArcGIS , ENVI or any softwares that they have accomplished ? I have three jp2000 files that is total about 28.1 GB that I want to mosaic with ?
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203 views

Retrieving Aerosol Optical Depth (AOT) from Landsat multispectral data

I need to retrieve Aerosol Optical Depth from Landsat multispectral datasets. Has anyone successfully tried something like that before?
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112 views

convert headerless flat binary files to tif

I have set of headerless flat binary files (those are out put files of TIMESAT software). I want to convert those to .tif format. I did it using ENVI. but it does not overlap with the original input ...
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64 views

Urban Heat Island USING ENVI

I have downloaded MODIS images for a specified area.. Its my first time that I am working on UHI (Urban Heat Island).. I need to know the methods to work on it.. I am using ENVI for this.
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34 views

Exporting landcover clasiffication from ENVI to SAGA

I have basic knowledge in remote sensing and GIS. I have generated landcover map in ENVI 4.7. How can I transfer or Export/Import this into SAGA so that I perform other functions in SAGA. I want to ...
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331 views

Conversion problem of projection of MODIS LAI from sinusoidal to geographic

I am trying to change MODIS data's (LAI) sinusoidal projection to geographic. Actually I did it. But when I reproject it by ERDAS, the output LAI raster moved about 10 km to west side of actual shape ...
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0answers
405 views

problem of using TIMESAT to processing MODIS NDVI

I want to use TIMESAT software to analyse time series MODIS NDVI data. Firstly, I use MRT tool to mosaic,subset and project MODIS NDVI data and output data as GEOTIFF format, and save as ENVI standard ...
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172 views

How to convert MODIS (Vegetation Continuous Fields - MOD44B) to (.img and hdr) in ENVI

Please can anyone help me to convert MODIS (Vegetation Continuous Fields) to (.img and hdr) formats? In ENVI, anytime i try using the MODIS conversion toolkit, a dialog box appears telling me to ...
0
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0answers
8 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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17 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 ...
0
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0answers
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 ...
0
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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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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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0answers
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 ...
0
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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?
0
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0answers
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 ...
0
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0answers
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 ...
0
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0answers
48 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 ...
0
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0answers
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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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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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 ...
0
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0answers
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 ...
0
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0answers
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 ...
0
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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 ...
0
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0answers
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 ...
0
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0answers
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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61 views

Unsupervised (ISODATA) classification in ENVI returns fewest classes possible

Running an unsupervised (ISODATA) classification in ENVI 5.2 consistently returns the fewest classes possible. For example, set to produce anything between 50 and 70 classes, the classification ...
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76 views

How to export/reproject GEOTIFF with UTM latitude band from ENVI

I'm trying to export GEOTIFFs from ENVI 5.1 SP1 to an app (GIS Pro on an iPad) that seems to require that the zone represent the latitude band and not the hemisphere (e.g. 30U, not 30N). Is there ...
0
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0answers
43 views

remove black margin of georeferenced image before overlay to google maps

i used envi to georeference satellite imagery. then I tried to overlay that geo image to google map. all fines BUT the black margin appears on the map. is there any way to git rid of that black ...
0
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0answers
335 views

EVI and NDVI range value

I've used a Landsat 8 image for vegetation analysis in an urban area. I've got a large maximum number of EVI value as shown in this image: Is this normal in calculating EVI and NDVI? Because I know ...
0
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0answers
25 views

Runnig of LSMA method in ENVI sotware

I am going to run LSMA method. However, I have some problems. First, how could I identify a correct threshold value from the PPI image? Second, how could I find correct places to draw ROIs ...
0
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0answers
106 views

PALSAR 50m Orthorectified K & C Mosaic it's possible to create interferometry?

JAXA is providing free access to PALSAR 50m Orthorectified K & C Mosaic. According to the website, data are provided in raw (HDR) and png. ALOS PALSAR K&C Mosaic or New global 50m-resolution ...
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30 views

Coordinates of ENVI exported vectors completely reversed when loaded in ArcGIS Desktop?

I have a problem with the coordinates of vector evf in ENVI. I'm working with a well referenced raster doing a supervised classification. The exported vector is completely reversed when loaded in ...