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10 Replies and 2034 Views
Color Slice Classification ENVItask 2034 10
Started by Deleted User
Hello! I am trying to apply a color table to a geo-referenced single band image so I can export it as a GeoTIFF with the original pixel values intact using an ENVI task or ENVI API. So far, I have been able to stretch the image (in IDL using ENVITask 'linearpercentstretchraster') with a 2 linear stretch, but the data ignore value (-9999) is changed to 241. When I display the stretched raster in ENVI, even though the metadata says -9999 is the data ignore value, ENVI still ignores the pix...
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by MariM 19 Nov 2018 02:20 PM |
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1 Replies and 1374 Views
ENVI Modeler 1374 1
Started by Deleted User
Hi, I have been looking at the ENVI Modeler to create simple batch programs. What I would like to do is write out the means for each band in a raster subset. The documentation on ENVI model has a tip that suggests the basic node, 'Output Parameters', would work. I tried it (several different ways), and I can't get the output means even printed on the screen. The list of tasks in the modeler does not include a 'Print' task. It would be icing on the cake if I could write the output of each rast...
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1374 |
by MariM19 Nov 2018 09:17 AM |
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1 Replies and 1253 Views
ENVI crashes on startup for Mac OS 1253 1
Started by Deleted User
Hi all! So I just installed ENVI 52 IDL84 on one of our laboratory's new computers. I copied a license file from one of our computers and it got IDL running. Now the problem. Everytime I try to run any of the 'ENVI' apps, then xterm/xquartz loads and then briefly shows a terminal showing the licensing information before closing. Nothing happens. Below are details about my system and license: System: OS: Mac OS High Sierra Version 10.13.6 software version: ENVI 52 and IDL84 XQuartz ...
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1253 |
by MariM19 Nov 2018 08:31 AM |
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6 Replies and 1808 Views
Statistics Calculations 1808 6
Started by Deleted User
I have calculated the statistics for an image raster (that has been masked, and contains NaN values) using the ENVI calculate statistics GUI, and the ENVIRasterStatisticsTask. These two options give me the exact same eigenvectors and eigenvalues for my raster. However, I am using these statistics for a PCA rotation. When I use the ENVI Forward Rotation with New Statistics GUI tool, the resulting eigenvectors and eigenvalues are NOT the same as calculated with the statistics only tools. This ...
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by Deleted User13 Nov 2018 01:40 PM |
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1 Replies and 2183 Views
Resize Data with ENVI Basic Tools 2183 1
Started by Deleted User
Hello, I have been trying to extract single bands from a 12 GB multi-band Sentinel-2 mosaic but it always give me some errors: First error: Read error at row 6144 column got 0 bytes then when I click OK it gives me another error WRITEU: Error encountered writing to file. Unit 104. The result may be invalid. Any help would be greatly appreciated. Thank you.
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2183 |
by MariM08 Nov 2018 10:05 AM |
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14 Replies and 2885 Views
ENVI API GLTreproject 2885 14
Started by Deleted User
Hello! I am trying to open and then re-project Sentinel 3 data using the ENVI API commands in IDL. The reprojectGLT ENVITask requires raster bands with the lat/lon values, but this is not how the Sentinel-3 data is opened in IDL. How do I do this The GUI in ENVI works beautifully, but I am hoping to streamline the processing. Thanks so much, Dulci
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2885 |
by MariM06 Nov 2018 12:18 PM |
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1 Replies and 2513 Views
ENVIROIMASKRASTER: Mask ROI does not contain any valid pixels for input raster 2513 1
Started by Deleted User
I am trying to do a simple masking of an AVIRIS scene using a single polygon shapefile that indicates my study extent. I've converted the shapefile into an ROI using the vector to ROI tool. I've been getting the 'ENVIROMASKRASTER: Mask ROI does not contain any valid pixels for input raster' error. I can clearly see that the shapefile overlaps with the image and that they both have the same projection. Also, I have attempted the same procedure using the shapefile/vector directly and that resulted...
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2513 |
by MariM31 Oct 2018 08:36 AM |
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4 Replies and 1519 Views
KazEOSat-1/2 sattelites support 1519 4
Started by Deleted User
Dear Mr. or Ms. We have a several stereo scenes of KazEOSat-1/2 satellies (https://directory.eoportal.org/web/eoportal/satellite-missions/k/kazeosat-1) We should to make a processing 1. Create DEM 2. Orthoresampling We tried to find the KazEOSat satellite sensor model among the supported satellites but we couldn't do it Do ENVI support KazEOSat satellite sensor model and we have a photogrammetric processing of data regards
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by Deleted User30 Oct 2018 09:16 AM |
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2 Replies and 2197 Views
Help need for Local spatial statistics Moran's I and Geary's C 2197 2
Started by Deleted User
I need come clarification regarding the Local Spatial Statistics tools(Getis-Ord G, Gearys C and Moran's I)
From the literature ENVI cited(And from other sources) I found that
"Moran’s I varies from -1 (negative autocorrelation) to 1 (positive autocorrelation).
Geary’s c ranges from 0 (Positive Autpcorrelation) 1 (no auto correlation) and 2 (negative spatial autocorrelation)."
However ENVI 4.5 is not obeying this rule, when I ran these methods on a raster file ...
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2197 |
by MariM29 Oct 2018 12:08 PM |
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0 Replies and 21574 Views
Digital elevations models editing 21574 0
Started by Deleted User
Dear Mr or Ms we have a DEM file and stere pair of satellite images But DEM file have a lot of 'noise' and we want to edit/filter it. Also we should make DTM file file from DEM. We have a special stereo monitor supports the passive polarization stereo mode (Planar) 1. Does ENVI support the editing of DEM file in stereo mode 2. Can I overlay the DEM file over the stereopair 3. Can I visualize and edit DEM file as TIN regards
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21574 |
29 Oct 2018 10:06 AM |
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1 Replies and 1337 Views
Forest Health Tool add parameters 1337 1
Started by Deleted User
To account for the Forest Health, I need to take into account 5 parameters, however, since the code is not public I can not make any changes or add the parameters myself. Please let me know a way around it. If the equation is available then it will be great and I can myself work my way around it by coding it myself.
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1337 |
by MariM28 Oct 2018 03:45 PM |
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3 Replies and 2040 Views
orthorectification error - image DEM not overlap 2040 3
Started by Deleted User
Hello,
I'm trying to orthorectify a QB image, using a DEM. Both images cover roughly the same area, with the DEM having a slightly larger extent than the QB image. I can link the viewers or geographically link them and the areas correspond (see link here: https://dl.dropbox.com/u/42285242/_ENVI_orthorectification_overlap_issues.jpg). The DSM on the right side is just there for reference and corresponds to the DEM 1:1.
However when I try the orthorectification (Map-Orthorectification-Quickbird-...
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by Deleted User11 Oct 2018 09:30 AM |
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6 Replies and 2194 Views
spot orthorectification 2194 6
Started by Deleted User
Has anyone orthorectified Spot images with 2A pre-processing These images don't appear to come with RPCs so not sure if I can use the ENVI orthorectification tool. Thanks!
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2194 |
by MariM08 Oct 2018 08:33 AM |
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1 Replies and 21377 Views
Spectral Hourglass wizard crashed halfway-- how to resume? 21377 1
Started by Deleted User
I am using Spectral Hourglass wizard to identify endmembers in AVIRIS data. However, it crashed after the n-Dimensional viewer. I have all the files saved from the previous steps, so how do I resume progress in the wizard at the n-Dimensional Viewer without having to go through all the previous steps Related question: Since I could not figure out how to resume the wizard, I've been trying to reconstruct the wizard workflow manually. However, I can't find the ENVI tool for spectral coherence...
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21377 |
by MariM24 Sep 2018 08:24 AM |
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1 Replies and 2043 Views
Confusion Matrix with ROIs 2043 1
Started by Deleted User
Hi Everyone, I have several ROIs that represent different objects on the ground and in every ROI I have same number of pixels. But when I generate the confusion matrix, the Envi multiply the number of pixels in each ROI by 4. For instance, if I have a ground truth ROI that represent water and comprised of 10 pixels, I will see the 'water' class in confusion matrix with total number of 40. I have tried many times and each time, Envi multiply it by 4 ( even when you have only 1 pixel in the ROI,...
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by MariM10 Sep 2018 02:20 PM |
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1 Replies and 20947 Views
Apply SAM classified pixels to larger scene 20947 1
Started by Deleted User
I used Spectral Angle Mapper to pull out pixels of interest to me, which creates a binary image, where those pixels with value 1 are pixels of interest. Specifically, I applied SAM to locate pixels which represent only sunlit vine leaves in a vineyard scene. How can I now use the SAM classified image to pull out only the vine pixels (with associated 272 bands) from the larger vineyard scene I would like to only operate on those pixels which I pull out as vine pixels and not all pixels in the vi...
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20947 |
by MariM10 Sep 2018 01:38 PM |
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4 Replies and 3025 Views
Sentinel 3 OLCI water product flags 3025 4
Started by Deleted User
Hello! Is there a way to read in the pixel quality flags for the Sentinel 3A water reflectance product. The flags are in a separate .nc file in the product, but I have not been able to load them into ENVI to create specific masks for land, or clouds. What am I missing Thank you! -dulci
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by MariM31 Aug 2018 09:13 AM |
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5 Replies and 6094 Views
Landsat 8 surface reflectance _MTL.txt file note recognized 6094 5
Started by Deleted User
Hello! I am using ENVI 5.4.1 & the open_as function to import Landsat 8 OLI Surface Reflectance files in GeoTIFF format with an _MTL.txt is not reading in the data. I know that there has been some support for that format, but the program is not recognizing the MTL.txt files as valid. Importing the GeoTIFFs and creating a metafile has created a host of problems because the data periodically is moved around on our computer, so while we have used this work-around for a couple of years, it is not...
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by Deleted User30 Aug 2018 03:08 PM |
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2 Replies and 2160 Views
Editing metadata in ENVI 5.3 2160 2
Started by Deleted User
This is an old question that was asked in a different thread, but the original question was not phrased very clearly so I am re-starting it here. The question is this: when I try to edit the ENVI metadata file in ENVI 5.3 to add a 'data ignore' value, the metadata window disappears, and the ENVI .dat file also disappears from the file manager. We need to be able to edit the metadata to include both an ignore value and also to import georeferencing from another file. But when the .dat file is...
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by Deleted User30 Aug 2018 03:04 PM |
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0 Replies and 2493 Views
Subtracting ROIs 2493 0
Started by Deleted User
Hi Every one, I have a Large ROI and I am generating a random sample out of that. Then I want to subtract the new generated one from the big original one to create another ROI. Is there any suggestion on how to do that Thanks.
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24 Aug 2018 02:35 PM |