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2719 Topics and 4729 Replies ENVI  2719  4729
RE: band math - if
by  Marcos Montes
15 Sep 2023 07:51 AM
2719 4729
RE: band math - if
by  Marcos Montes
15 Sep 2023 07:51 AM
20 Topics and 48 Replies ENVI LiDAR  20  48
RE: Classification functi...
by  asdfsdf asdfsd
15 Jun 2020 07:05 PM
20 48
RE: Classification functi...
by  asdfsdf asdfsd
15 Jun 2020 07:05 PM
68 Topics and 122 Replies ENVI SARscape  68  122
RE: PSinSAR processing is...
by  Karim Abdelmalik
04 Sep 2023 09:19 AM
68 122
RE: PSinSAR processing is...
by  Karim Abdelmalik
04 Sep 2023 09:19 AM
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0 Replies and 172 Views DEM Extraction Wizard: CORONA  172  0 Started by  Matt Peacey I am currently trying to process a number of CORONA images using the DEM extraction Wizard. I have ben successful in building RPC's, GCP's and tie points. I am now on step 7, however I am getting no values for X Y pixel size. Has anyone encountered this or knows whether there is an error in an earlier stage of processing causing this Many thanks
0 172
22 Jun 2023 02:38 AM
0 Replies and 174 Views Georeferenced Projection with different variables  174  0 Started by  Maxime Pineau Dear all, I have a .sav file with the variables described here that I have imported from IDL into ENVI Classic: ALTI - FLOAT = Array&91;640, 420&93; : altitude FLAT3 - FLOAT = Array&91;640, 420, 438&93; : hyperspectral cube with 438 channels CUBE3 - FLOAT = Array&91;640, 420, 15&93; : spectral parameters calculated on FLAT3 to highlight different surface materials LATI - FLOAT = Array&91;640, 420&93; : latitude LONGI - FLOAT = Array&91;640, 420&93; : longi...
0 174
26 May 2023 02:55 AM
0 Replies and 212 Views No data areas classified  212  0 Started by  Vistorina Amputu Hi, I use ENVI 5.6.3 for my drone imagery analysis. The background around of my region of interest is set to No Data via edit metadata with the data ignore value set to 0, and thus appears as white (or mabye this is transparent). I am applying thresholds via the decision tree classifer to classify my drone imagery into bare, herbaceous and woody classes. But, the background area also gets classified as bare, which affects the statistics and the confusion matrix calculations. I tried to subset th...
0 212
20 Apr 2023 09:43 AM
0 Replies and 182 Views No data areas classified  182  0 Started by  Vistorina Amputu Hi, I use ENVI 5.6.3 for my drone imagery analysis. The background around of my region of interest is set to No Data via edit metadata with the data ignore value set to 0, and thus appears as white (or mabye this is transparent). I am applying thresholds via the decision tree classifer to classify my drone imagery into bare, herbaceous and woody classes. But, the background area also gets classified as bare, which affects the statistics and the confusion matrix calculations. I tried to subset th...
0 182
20 Apr 2023 09:43 AM
0 Replies and 184 Views No data areas classified  184  0 Started by  Vistorina Amputu Hi, I use ENVI 5.6.3 for my drone imagery analysis. The background around of my region of interest is set to No Data via edit metadata with the data ignore value set to 0, and thus appears as white (or mabye this is transparent). I am applying thresholds via the decision tree classifer to classify my drone imagery into bare, herbaceous and woody classes. But, the background area also gets classified as bare, which affects the statistics and the confusion matrix calculations. I tried to subset th...
0 184
20 Apr 2023 09:43 AM
0 Replies and 199 Views No data areas classified  199  0 Started by  Vistorina Amputu Hi, I use ENVI 5.6.3 for my drone imagery analysis. The background around of my region of interest is set to No Data via edit metadata with the data ignore value set to 0, and thus appears as white (or mabye this is transparent). I am applying thresholds via the decision tree classifer to classify my drone imagery into bare, herbaceous and woody classes. But, the background area also gets classified as bare, which affects the statistics and the confusion matrix calculations. I tried to subset th...
0 199
20 Apr 2023 09:43 AM
3 Replies and 1520 Views ENVI fails on OSX 12.0.1  1520  3 Started by  Peter VOGT Using ENVI 553 on macOS 12.0.1: EnviClassic as well as ENVI start and work fine. Using ENVI 561 on macOS 12.0.1: EnviClassic as well as ENVI fail to start without any error message. Also the LicenseAdministrator application fails to start. Any ideas what changed here ENVI 5.6.1 or how to fix making it work again under Monterey
3 1520
by  Ben CastellaniJump to last post
24 Mar 2022 01:33 PM
0 Replies and 1022 Views Average NDVI Per Land Cover Class  1022  0 Started by  Dylan Johnston Hi! I'm currently working on a project assessing the reduction in NDVI following a hurricane. I've created pre and post hurricane NDVI images, and have also undertaken a supervised land cover classification of the Landsat 8 imagery. I was wondering if anyone knew how I might go about calculating the average NDVI value per land cover class, so that I can quantify the difference. I would truly appreciate some ideas. Thanks!
0 1022
29 Sep 2021 09:50 AM
0 Replies and 1124 Views FLAASH model atmospheric correction error  1124  0 Started by  Martin Chari May you please assist with how to resolve this error (ACC error: convert 7). I am trying to convert SPOT 6 from top of atmosphere to surface reflectance.
0 1124
16 Apr 2021 02:00 AM
1 Replies and 3229 Views ASTER Crosstalk Correction  3229  1 Started by  Jose Manuel Lattus Hi! I read that ASTER need crosstalk correction, there is a processing level that have this correction, does ENVI can do this correction in any tool Do you know if ASTL1T needs also crosstalk correction thanks Jose Manuel Lattus
1 3229
by  sedat sedatJump to last post
17 Nov 2020 10:34 PM
0 Replies and 9631 Views Sentinel 2 QUAC  9631  0 Started by  Motoshi Honda I have Sentinel 2A Level 1C imagery from USGS EarthExplore and would like to perform QUAC atmospheric correction, but Sentinel 2A does not appear in the Sensor Type dropdown box of the QUAC window. Which sensor type should I use Can't QUAC handle Sentinel 2A
0 9631
18 Mar 2020 04:02 PM
0 Replies and 5407 Views Georeference with IGM  5407  0 Started by  Silvie Cafarella I have three ASCII files: 1) pixels values, 2) upper left corner longitudes, and 2) upper left corner latitudes. All three files are 1350 X 1350, left-to-right, top-to-bottom. The coordinates are in a polar stereographic projection with a 4.5km resolution (‘ a=wgs84 proj=stere lat_0=70.0000000 lon_0=-45.000000’). I tried using 'Geoference with IGM', but I either get an error, often 'an attempt to subscript DXS was out of range' or there is an output grid of 77 X 2330, with a weird arrangem...
0 5407
12 Dec 2019 01:31 PM
1 Replies and 1985 Views Hyperspectral Image Background Removal  1985  1 Started by  Catherine Chan I'm unable to remove or make transparent the black backgrounds that come with my hyperspectral images, making processing and analysis more difficult. I have attempted setting the 'zero' or other black background values as invisible, but I actually can't access metadata editing. When I click on 'edit metadata', a message with 'Parameter; averagepixeldisp, ';averagepixeldisp' is not a valid IDL variable name.' shows up and the program will often close itself after.
1 1985
by  Mari MinariJump to last post
02 Dec 2019 11:14 AM
2 Replies and 3209 Views Radiomteric Calibration of WorldView 3 in ENVI 5.5  3209  2 Started by  Jessica Mitchell Has anyone experienced the Radiometric Calibration tool not working in ENVI 5.5 I am trying to convert World View 3 multispectral file from DN to TOA radiance for FLAASH input. I have tested pretty much all parameters (e.g., radiance, reflectance; float, double; flaash settings; bil, ). The same tool runs in ENVI 5.5 Classic.
2 3209
by  Afolarin LawalJump to last post
13 Nov 2019 04:53 PM
2 Replies and 2256 Views How to apply threshold on output Fraction RGB Image from Linear Unmixing tool.  2256  2 Started by  Nasir Hameed I am intending to apply threshold on output RGB Fraction Image produced by the Linear Unmixing tool in ENVI. The resultant image consists of three RGB bands (Soil, Vegetation and RMS Error), how would I apply threshold on Soil and Vegetation fractions contained within. Whether I am supposed to add them independently and apply threshold or there is alternate option/tool enabling me directly apply threshold on RGB image to isolate range of pixel values representing vegetation or soil
2 2256
by  Nasir HameedJump to last post
02 Sep 2019 01:24 AM
1 Replies and 2678 Views Opening an image using xml file  2678  1 Started by  Rajeev Bhattarai Hi, when I try to open a tile of Sentinel-2 file in ENVI using XML file it takes me to a dialogue box with a name 'header info' asking for the number of samples, lines and bands, without doing this, it doesn't allow me to open the image. What am I supposed to specify there Thanks in advance.
1 2678
by  Mari MinariJump to last post
29 Jul 2019 05:10 AM
1 Replies and 1999 Views Envi 5.5.2 seems to be running slowly  1999  1 Started by  Charles Umbanhowar I am running 5.5.2 and am experience slow performance and multiple crashes (at least one time a Kernel error was reported). I am working with a Sentinel -2 Image that 4720 x 2826 which doesn't seem that large. I am trying to run band statistics subsetting with ROAs (14 classes) that I created from a shape file that I imported from ArcMap that has about has about 320000 individual ROAs. Is this where my problem lies All I want to do is summarize band stats by ROA. I have 32 gigs of RA...
1 1999
by  Jenny BloomJump to last post
19 Jun 2019 01:49 PM
1 Replies and 1628 Views n-D Visualizer and ROI's  1628  1 Started by  Nikolaos T Hi, I am new to ENVI so excuse me if I did not explain in a clear manner my problem. I am trying to create some ROI's using the n-D Visualizer tool &91;for simplicity I have created 6 classes (Class-New)&93;. Of course I have searched for pixels located at the corners of the plot, while rotating the n-D Visualizer. Here is the problem: when I am exporting the ROI's and add them in the Layer Manager there are no pixels/ROI's even though in the n-D Visualizer I have picked more than 100 pixels f...
1 1628
by  Jenny BloomJump to last post
06 Jun 2019 10:31 PM
1 Replies and 2430 Views Extracting raster values from point vector location  2430  1 Started by  Rajeev Bhattarai Hi, I want to extract the pixel value of the vector points from a stack of raster and secondly I want to establish a rectangle around that point and extract the value in that rectangle. How can I do that Thanks in advance.
1 2430
by  Jenny BloomJump to last post
06 Jun 2019 10:20 PM
1 Replies and 5121 Views Error''expression must be a scalar or 1 element array in this context<BYTE array[20]''  5121  1 Started by  Yassine Manyari Hello! I'm trying to add the RPC coefficients manually in the tab ''Edit Envi header'' but it shows me an error entitled : ''expression must be a scalar or 1 element array in this context
1 5121
by  Jenny BloomJump to last post
31 May 2019 11:50 AM
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