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

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3
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1answer
193 views

ENVI raster file with nodata change to 0

I have a geotiff that I converted to a ENVI raster file with the following command: gdal_translate -of ENVI srtm_05_08.tif data.bil The geotiff has water values supposedly set to nodata. I am ...
3
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1answer
281 views

Applying pixel reliability mask to time series MOD13Q1

I am working with a 23-band GEOTiff in which each band is a 16-day MVC MODIS NDVI image. The MODIS .hdfs include a "pixel reliability" image with the following values: [-1]: Fill/No Data-Not ...
1
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1answer
111 views

Landsat 8 dataset processing in batch?

I´m trying to open Landsat images at Geotiff with metadata in ENVI. I have a dataset of 101 Landsat 8 images and I want to open all the images and then save them to do some band math either on ...
1
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1answer
33 views

How to convert an endmember collection spectral signature file from OLI sensor to TM and ETM+ sensors

I'm working on some supervised classifications using scenes from the landsat legacy archive wich include ETM+, TM 5 and OLI data from 2001 to 2014. I have training and validation points for each scene ...
1
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1answer
218 views

ENVI5.0. Is it possible to use “Quickmap” option? How to create a simple map?

I used to work in ENVI 4.8, but now have to move on ENVI5.0 I found it was changed a lot comparably with the previous versions, obtained many good new options, but some old options, in ENVI4.8, are ...
1
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1answer
355 views

Raster vs. Raster Scatter Plot in ArcGIS

I created two raster datasets from the same world view 2 image. One dataset is NDVI, the other is a normalized surface water index (NDSWI). I would like to create a scatter plot for a pixel by pixel ...
1
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1answer
72 views

How can I change the highest and lowest value of image?

I want to change the highest and the lowest value of raster image. I want it to have the highest value of 345 and the lowest of 0. The highest value of original image now is 265 and the lowest is ...
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97 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 ...
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0answers
163 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 ...
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35 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 ...
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44 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 ...
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0answers
517 views

Enhanced vegetation index using ENVI 4.7 bandmath

I computed Enhanced Vegetation Index using band math in ENVI 4.7 software. The expression used was: 2.5*((float(b1)- float(b2))/(float(b1)+ (6*float(b2)) +(7.5* float(b3)))) BYTSCL(float(b1), min = ...
2
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0answers
211 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 ...
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0answers
30 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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25 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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64 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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134 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 ...
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0answers
17 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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0answers
59 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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129 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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74 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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54 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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26 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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207 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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270 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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140 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 ...
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10 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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8 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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28 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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15 views

MOD13Q1 data (2008-2012)

i ordered MOD13Q1 images (2008 -2012) from NASA and there came in hdf format, now i want to extract only NDVI images but the hdf made up of all vegetation indices data.Please how can i solve this?
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20 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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24 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 ...
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0answers
30 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 ...
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21 views

georeferencing envi data with lat/lon in arcmap

I need to georeference gridded ENVI files or rather add georeferencing to the metadata. I do have the lat/lon of the corner points of the data and the spatial resolution. Any suggestions of how to put ...
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11 views

Georeferencing of ROI in ENVI?

I had an image which is not georeferenced for my study area. I have processed the data and made roi files in envi 4.7. Now I have georeferenced the image data. I have a doubt that whether the roi ...
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0answers
8 views

ENVI 4.7 editing overlapping individual classified layer

Does anybody knows how to erase/ eliminate an overlapping individual classification output in ENVI? Thank you
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164 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 ...
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16 views

denoising modis data using envi

I have remove the noises in MODIS ndvi and evi raw data to subject them into regional lulc classification. I am using envi 5.0 . Which module in it will do the job by automated process . I dont ...
0
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0answers
24 views

lulc unsupervised classification in envi for modis 250m data

I've got modis 250m data with NDVI,RED,BLUE,NIR,MIR bands....i have to obtain 10 classes such as Urban,Evergreen,decidious,cropland,fallowland,plantaion,water,barrenland,land with scrub,land without ...
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0answers
29 views

Suppress values from multiband rasters

I have a raster stack with 84 bands . It is a time series raster. It so appears that the cloud is causing error in my processing and hence i need to suppress or replace them by a NaN to eliminate them ...
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0answers
20 views

Data conversion from IDRISI to ENVI

I have signature data generated with idrisi selva programme(rgf format). How is transfer signature data to ENVI? I want to classification by this signature data in ENVI. Could you answer, please
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19 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
40 views

How to write a UNIX ANSI text file under windows by IDL

I want to use openw in IDL to write a UNIX ANSI text file under windows. But the result are always in the format of PC UTF-8. Does some one know how to solve this issue? Thanks!
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0answers
89 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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0answers
27 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 ...
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0answers
243 views

How to clip Spot Image using shapefile in ENVi 4.7 or 5.0?

I have a Spot image that I would like to clip using the bounds of a town in shapefile format using ENVI 4.7 or ENVI 5.0. How do I do this?
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53 views

Extract individual land cover classes from NLCD dataset in ENVI

I have a National Land Cover Dataset with 16 different classes. Is there a way to extract the pixels from each individual class and save it as a GeoTiff using ENVI (either Classic or 5.0) so that in ...
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0answers
50 views

Vectorized a historical soil map advice

I received a PDF file of a soil map in the Middle Rio Grande Valley near Albuquerque, New Mexico however it is dated in 1914. I was able to split the north and south because it came in one map and ...
0
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0answers
30 views

How to derive acquisition date from short unsigned file using ENVI

I need to derive a processing date from a file which is unsigned short file using ENVI software. The files are in ENVI standard format (image and header file format). I have searched this on Google as ...
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68 views

Python Error in recognising ENVI file

I am trying to read a .bip AVIRIS file using GDAL in Python. here is the code: from osgeo import gdal from osgeo import ogr from osgeo import osr from osgeo import gdal_array from osgeo.gdalconst ...