Questions tagged [envi]

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

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3answers
1k 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. ...
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1answer
188 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
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. ...
4
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1answer
516 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 names(...
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2answers
3k 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 ...
11
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1answer
1k views

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

I'm a 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 can ...
8
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2answers
3k 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 = 1....
2
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1answer
356 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
688 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. some_text http://...
2
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1answer
119 views

Adding new feature class to already classified image in ArcGIS Desktop?

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 ...
2
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1answer
2k 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. ...
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1answer
851 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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0answers
50 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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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, ...
0
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1answer
29 views

Sub-Shapefile Attribute Ineritance

I have two shapefiles: a shapefile of plant communities: each polygon there covers a wide swath of land and names the plant community there. I also have another shapefile that identifies a bunch of ...
1
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1answer
85 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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0answers
431 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.
2
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3answers
7k views

NetCDF to Geotiff file conversion

How would I convert NetCDF files to Geotiff format? The data I am using is air temperature data that comes from the Climatic Research Institute and I want to display it on ENVI. I am not familiar with ...
1
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1answer
169 views

How do you digitize an ROI in envi 5.2?

Is there a way to digitize an ROI in ENVI 5.2 that is larger than the area shown in the viewer? I'm setting up labs for an intro to RS class, and the next step is to subset the image to get rid of ...
2
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1answer
446 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 ...
2
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1answer
1k views

Mosaicking many tif files in ArcMap for ENVI

my question is how to go about mosaicking ~120GB, 1200+ tif files into one raster within ArcMap. I am currently splitting up the region in smaller sets and then plan to mosaic all these together to ...
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1answer
2k views

Doing Accuracy Assessment using test data from shapefile in ENVI?

ENVI 5.2.1. From a .tiff image (4 bands) I created a Supervised Classification Maximum Likelihood .dat file. Now I want to perform an Accuracy Assessment using test data from a shapefile. I've tried ...
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1answer
219 views

Analyzing MODIS MCD12Q1 level 3 data in ENVI?

How can i see the classes of the product MODIS MCD12Q1 and analyze them in ENVI exelis? Seadas open them but ENVI not.
2
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1answer
131 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 ...
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1answer
825 views

How to call Exelis ENVI tools with python and ArcGIS?

I am writing a script for geopocessing landsat data using ArcGIS 10.3. But ArcGIS doesn't have tools for landsat calibration (converting from DN to reflectance) and ENVI have this tool called "...
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1answer
4k 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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1answer
810 views

mosaicking and projecting modis land cover data MCD12Q1

I have modis land cover MCD12Q1 data .Its in the sinusoidal projection (.hdf native format ). I have to study the land cover characters from the data for which i have to convert them into .tif format ,...
0
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1answer
183 views

DEM data processing

I downloaded ASTER GDEM Tiles and mosacked them in ENVI. After that I exported the Mosaic in tiff format and I opening it in Arcgis, the image is gray all through but the pixels are showing correctly. ...
3
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1answer
881 views

Applying savitzky golay filter to MODIS NDVI data

I want to smooth the NDVI MODIS 16 bit integer data .tif for LULC classification. I have timesat 3.1 software on windows but I don't how to apply the SG filter. I am not that good in programming. I ...
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3answers
9k views

how i calculate land surface temperature using landsat 8 in Envi 5.1

I am doing research about land surface temperature using Landsat 8 image. However, I have a problem with them. I have read document from Landsat.org, but i can not do it in Envi. Could you help me ...
0
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1answer
54 views

Need to develop a model for measuring inter-annual and seasonal variability in pasture cover using modis 16 day composites

Aiming to use statistical methods in ArcGis and Envi image analysis to measure inter-annual and seasonal variability in paster cover using MODIS 16 day composite image from 2000-2014. Quite stuck on ...
2
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2answers
434 views

How to destripe the thermal band in SLC_off LandSat 7 ETM+ data?

I am working on a special study in one of my subject. My study would require me to extract land surface temperature each year for 2007-2014. Since LandSat 5 ceaseed to operate last 2011, my 2012-2014 ...
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2answers
3k views

set cells with specific values as NoData in afloating raster

I have a raster file which includes floating values. I need to set cells with specific values as Nodata. For Raster integer values, the setnull tool can be applied, is it any tool for floating point? ...
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1answer
933 views

Spectral mixture analysis from GeoTIFF in ENVI

I have a single GeoTIFF created from some NGB aerial photography that has been stitched in Agisoft Photoscan to create a single image of an area of heath. I would like to perform spectral mixture ...
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1answer
2k views

ENVI 5.1 Help with clipping irregular shapes

Does anyone know how to clip files using an irregular shapefile so that I don´t get the rectangle geometry in the end?
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0answers
695 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 ...
0
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1answer
578 views

atmospheric correction in ENVI 5.1

I want to perform atmospheric correction on Landsat 8 images in ENVI 5.1. In order to create radiance image, I selected basic tools> preprocessing> calibration utilities> Landsat calibration. However, ...
2
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1answer
826 views

ENVI 5: High resolution export of multiband imagery

I have to export some multiband Landsat imagery (Landsat channel combination 543) in high resolution in ENVI 5 for a Figure which I later will edit in Adobe Photoshop and Illustrator, best would be ...
0
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1answer
660 views

creating multi band raster from one GeoTiff

I'm using AgiSoft photoscan to create a photo mosaic from aerial images. The images are being captured using a camera modified for NIR and RGB data capture. I want to be able to perform spectral ...
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 ...
1
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1answer
577 views

Pro vs Con on using export to JPEG or JP2000 files for large imagery files

What is the preference among GIS Specialist and Remote Sensing Specialist using the JPEG vs JP2000. Yes, I am aware of other compressed files such as ECW or MrSID... I am more of concern of how to ...
7
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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,...
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1answer
121 views

Working with Aura's OMI data in ENVI

I have downloaded Aura's Ozone Monitoring Instrument (OMI) data from http://mirador.gsfc.nasa.gov website but I can not work with them. How can I open these data in ENVI and what pre-processes are ...
0
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1answer
168 views

Pyramid Creation Utility for ArcGIS 10.1 or later

Someone wrote a really neat ENVI Pymramid Creation Utility I am wondering if there is similiar one for ArcGIS
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1answer
711 views

Analyzing stacked time series NDVI images in ENVI? [closed]

I just started playing around with stacking NDVI images from different years into one RGB value and am unsure how to read the photos or analyze them. The image on the left had R 2011 G 2011 and B ...
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0answers
87 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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2answers
136 views

How to load two images in ENVI 5.1?

I am using ENVI 5.1 and when I use the Data Manager to load several images and if I want to load two adjacent images, why would one of them load and the other doesn't?. Am I missing something here ?
1
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1answer
3k views

Loading ENVI file into ArcGIS Desktop?

I received a series of *.img files with a single .hdr file that contains the necessary georeferencing information (i.e., samples, lines, coord system, etc.). I presume this is an ENVI header file ...
0
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1answer
642 views

opening a georefrenced image in IDL in ENVI

I am working with idl in envi,I want to use ENVI_CONVERT_FILE_COORDINATES in case of finding pixel value of specified point,for this porpuse I have lat and long data of my point but I need to open ...
1
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2answers
230 views

Modis LandCover processing

is there any tool to open and process MCD12Q1(modis landcover product)? apparently ENVI doen't work for this. any help highly appriciated.