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2 Replies and 91 Views
Forward MNF to Spectra 91 2
Started by Ludovic Legros
Hello, I'm trying to use the tool 'Forward MNF to spectra' to realize a MTMF. However, I tried different spectra from the USGS library and I got eveytime the same MNF spectra no matter what spectra I choose (alunite, opal, chlorite, ...). I probably did a mistake somewhere. Is it a problem from the tool, or the MNF Thank you, Ludovic
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by Ludovic Legros 03 May 2018 07:19 AM |
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2 Replies and 84 Views
Sentinel-2 XML Error 84 2
Started by Grant Pearse
Hi, I am aware of the previous issues opening long filenames or opening Sentinel-2 L1/L2 images in older versions of ENVI but the issue seems to have cropped up again with the latest version of ENVI in combination with the latest outputs from Sen2Cor. I processed some L1C images to L2A using Sen2Cor 2.5 and attempted to open them using ENVI 5.5 from the XML file. Immediately after the first 'Reading Sentinel 2' dialog box I get a second dialog box saying 'ENVI Error: IMAGEINFO.' The files...
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by Grant Pearse26 Apr 2018 02:14 PM |
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0 Replies and 20 Views
Sentinel-2 XML Error 20 0
Started by Grant Pearse
Hi, I am aware of the previous issues opening long filenames or opening Sentinel-2 L1/L2 images in older versions of ENVI but the issue seems to have cropped up again with the latest version of ENVI in combination with the latest outputs from Sen2Cor. I processed some L1C images to L2A using Sen2Cor 2.5 and attempted to open them using ENVI 5.5 from the XML file. Immediately after the first 'Reading Sentinel 2' dialog box I get a second dialog box saying 'ENVI Error: IMAGEINFO.' The files...
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25 Apr 2018 04:48 PM |
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1 Replies and 74 Views
FLAASH crashing (ACC error: archive file header) 74 1
Started by Joshua Kelly
Hello, I am trying to perform atmospheric corrections on PlanetScope 3m imagery using FLAASH but the tool is crashing with the following dialogue: https://imgur.com/a/8g1fxQy I should mention that I had to import my own Spectral Library as ENVI hasn't yet set one up for Planet. Can anyone diagnose what the problem is here Thank you in advance, Josh
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by Mari Minari23 Apr 2018 08:54 AM |
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3 Replies and 59 Views
DarkSubtractionCorrection Task 59 3
Started by Russell Ives
I created a short API to take radiometrically calibrated, top of atmosphere reflectance data from Woldview 2 image and apply the DarkSubtractionCorrection Task to it. Where ever the pixel_state was set to 1, data values to ignore set to 0 in the input image, returns negative values in the resulting output image. How can this be corrected so the result doesn't apply the subtraction to the pixels to ignore
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by Mari Minari23 Apr 2018 08:50 AM |
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1 Replies and 73 Views
Export to ENVI failing 73 1
Started by Adam Levine
Hi guys, I am trying to export to ENVI an resampled L2A product, but the process completes only to 60 or so, and then it disappears. When I check the folder selected for export, I can only notice a folder called product_name.data and inside of it there is a 'vector_data' folder and 4 files (2 .hdr and 2 .img). I know that I should be expecting a single product_name.hdr file. Isn't this correct Also when I want to open the original file in ENVI it tells that is not a valid Sentinel 2 pro...
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by Mari Minari19 Apr 2018 12:41 PM |
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0 Replies and 72 Views
A IDL script for the decision tree 72 0
Started by Lorenzo Bernardi
How can I perform a raster classification using a decision tree by running an IDL script I just know the logic sintax and how write it into IDL, but I do not undestrand how produce a classification layer with 5 classes performing the execution of a decision tree by using ENVI API or IDL script. Thank you for any suggestion.
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72 |
10 Apr 2018 02:00 AM |
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1 Replies and 103 Views
ENVI 5.5 Apply mask 103 1
Started by jucasas
I installed version 5.5 of the ENVI, and I want to apply a mask to an image to assign NaN values, but when looking for this tool in the ENVI menu, I could not locate it. In this new version there is a tool that replaces the 'Apply MAsk' Best regards. Juan Casas
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by Mari Minari09 Apr 2018 01:51 PM |
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1 Replies and 128 Views
Edit ENVI Header 128 1
Started by Dulci Avouris
Hello, I have been processing Landsat 8 images with ENVI/IDL and I have run into a problem when I try to save a VPCA band with data ignore values. After the image goes through the PCA to VPCA rotation, I import the VPCA bands to ENVI from IDL. After the memory file is saved, I select the edit ENVI header management file option to enter a data ignore value of 9999 which is the mask value I created earlier in the process. After I enter in the data ignore value, the recently saved VPCA file gets r...
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by Mari Minari28 Mar 2018 07:49 AM |
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3 Replies and 186 Views
NDWI with TOA or Surface Reflectance 186 3
Started by Jose Manuel Lattus
I review many papers and documents related to NDWI ((Green-NIR)/(GreenNIR)) but in some documents they une Surface Reflectance and in other TOA Reflectance. I perform the NDWI with both formats and even the results are similar, with TOA the NDWI is greater than 0 for water bodies, and with Surface is a little higher (>0.2)... but to be rigurous, wich format I have to use regards Jose Manuel Lattus
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by Mari Minari20 Mar 2018 12:59 PM |
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2 Replies and 157 Views
Tasseled Cap in Landsat 8 157 2
Started by Jose Manuel Lattus
Hello! I know that TassCap use coefficients derived from Landsat images (MMS, TM), in case of Landsat 8 it's necesary to redefine those coefficients What if I perform a Spectral Subset to Landsat 8, saving just the same 6 bands present in Landsat 7 and apply the Tasseled Cap transformation in ENVI selecting this Pseudo Landsat 7 TM (derived from Landsat 8) thanks for any comment José Manuel Lattus
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by Jose Manuel Lattus19 Mar 2018 11:00 PM |
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1 Replies and 170 Views
Level 0/RAW ERS data 170 1
Started by Salvatore Savastano
For my PhD project I need to work with Level 0/RAW ERS data, collecting all possible info recorded during the acquisition step and used in the focusing stage. I have the permission from ESA to download them through Eolisa. Unfortunately currently the files have extension .E1 or .E2 and and not .dat (as requested in ENVI that reads ERS-1 Level-0 with extension dat*.001, CEOS format). Is there someone who has worked with this type of data Is under development an update in ENVI to consider also t...
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by Mari Minari13 Mar 2018 12:14 PM |
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1 Replies and 202 Views
Landsat Level 2 Surface Reflectance xml to MTL 202 1
Started by Gus Williams
We are looking for a more automated method for loading the new Landsat Level 2 products from USGS. This was discussed in the Joe Peters blog post titled 'Working with Landsat Surface Reflectance High Level Data Products in ENVI'. As stated in the post, we can load the individual tif files and then add the information to the header's manually. However we are working with time series analysis (lots of images), a more automated tool would be beneficial. Mr. Peters mentioned in his blog post ...
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by Mari Minari05 Mar 2018 11:02 AM |
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4 Replies and 123 Views
Maintain background pixels through raster stretch 123 4
Started by Solar Smith
I'm trying to write automated processing routines to stretch and reformat my binary file data. I have floating point raster data in which the background pixels are zero and all valid values are greater than zero. I need to stretch the data to byte values and keep the background pixels distinct from the data pixels. I'm trying to use ENVILogStretchRaster to stretch the data. Unfortunately, pixel values near the MIN value are being mapped to zero which then look like background values. I'd li...
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by Mari Minari05 Mar 2018 10:59 AM |
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3 Replies and 154 Views
Classification to Vector -- Length attribute 154 3
Started by Chana Sara Ivgi
I used the maximum likelihood classifiers. I want to measure the length in the direction of wind of one of my classes. Is there a way to specify how to measure length In addition, how is length currently measured in the algorithm
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by Mari Minari26 Feb 2018 01:36 PM |
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1 Replies and 163 Views
Satellite Imagery - depth of sub-folder structure issue 163 1
Started by Frank Obusek
Just in case other folks are having issues. Something I have noticed with ENVI 5.5 is that XML files do not appear to be read or ingested by ENVI processes (QUAC) if the xml file exists deep within a file folder structure. For example, I am working with Pleiades imagery. Once copied onto the harddrive, you have to drill deep into a sub-folder structure with very long naming conventions to access the multispectral and panchromatic xml dimap tif files. If you input the xml into the QUAC or s...
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by Mari Minari23 Feb 2018 01:15 PM |
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1 Replies and 154 Views
Band for Water Removal 154 1
Started by Jay Mishra
At time of FLAASH execution, water band removal option creates the error. Error message is : https://drive.google.com/file/d/1jINQ4QSQqqXr-ZV5LbbLrd0zWak78-PX/viewusp=sharing. I have changed the tile from 100 to 2000 MB. But the error is same. When the water removal option is deactivated, the FLAASH correction done properly. But the required data shows some abrupt value.near the water absorption bands and the overlapping bands create the difficult value and spectra become very bad. It iskindly ...
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by Mari Minari23 Feb 2018 12:49 PM |
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1 Replies and 119 Views
overlay NDVI created from different satellites 119 1
Started by khaled zerroug
Hi, I work on a diachronic map of vegetation, I use RGB NDVI technique , this technique is based on the use of three ndvi taken in three different dates to quantify the change of the green biomass through the three dates (1984, 2001, 2016), The three NDVI are assigned to red green and blue channels respectively. in my case, NDVI's of 1984 and 2001 are produced from Landsat TM 5 images, but NDVI 2016 is produced from a Landsat 8 image,I want to know if the use of NDVI from different sensors (la...
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by Mari Minari23 Feb 2018 10:51 AM |
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0 Replies and 151 Views
File Size Limit to Rasters when Mosaicking? 151 0
Started by Jenny Bloom
I had an ENVI user post this question: 'I've been trying to mosaic several rasters (each representing a different city in my location) into a single raster. The mosaic preview suggests that this is doable. The processing also seems to finish. However, no mosaic output file is generated. Is there a file size limit on individual rasters Assuming that the 'no data' areas between rasters are not adding much to the file size, the input rasters should add up to about 9 GB. Do you have any ideas ...
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20 Feb 2018 11:20 AM |
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1 Replies and 159 Views
Exported ROI coordinates 159 1
Started by Kathryn Powell
I'm exporting ROIs to CSV in ENVI 5.4. The 'Map X' and 'Map Y' coordinates are exported as integers, but I need additional precision. Is it possible to change this setting
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by Mari Minari15 Feb 2018 12:41 PM |