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1 Replies and 2123 Views
Radiometric calibration of Parrot Sequoia image 2123 1
Started by Deleted User
Hi, I'd like to conduct radiometric calibration of the image captured using Parrot Sequoia. However, there are not gain and offset data of Parrot Sequoia images uploaded on ENVI5.5. Then, Is it possible that conduct radiometric calibration of Parrot Sequoia image using ENVI5.5
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2123 |
by MariM 26 Jun 2019 05:36 AM |
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1 Replies and 2180 Views
Classification workflow 2180 1
Started by Deleted User
We have many orthographic images that we are using ENVI 5.2 to do supervised classification. They all share many of the same characteristics and are form the same region. We want to do some supervised learning on a few images, but carry over the results and then automate the process. We have far too many images to do them all by hand. We would like to train on a few, automate the process, check some by hand, and add new classification data as needed to resolve mistakes. Any idea how to do this ...
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2180 |
by MariM20 Jun 2019 08:00 AM |
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0 Replies and 3587 Views
Surface Energy Balance Algorithm for Land (SEBAL) for Evapotranspiration calculations 3587 0
Started by Deleted User
Jeffrey Snoddy University Of Southern California (USC) Spatial Science Department,, M.S. Table 5. Summary of equipment and software needs for Normalized Difference Vegetation Index (NDVI) equation Equipment/Software Source Application ENVI ENVI Visualization/Analysis/ Data Organization ArcMap ESRI Visualization/Analysis ArcCatalog ESRI Data Organization Sankey www.Sankeymatic.com Mode Flow Charts S3 Amazon Web Services Database Storage Slack Slack.com Team Posting USC Library Se...
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14 Jun 2019 12:46 PM |
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3161 |
by Deleted User06 Jun 2019 10:23 PM |
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1 Replies and 2114 Views
Assessment of DEMs based on GCPs 2114 1
Started by Deleted User
Hello, I have 3 different Digital Elevation Models and GCPs of the same area and I want to assess the accuracy of each DEM based on those GCPs. I want to know the tools that I have to use to do so in ENVI 5.3. I have also a question about how to generate a DEM from stereo images. Thank you,
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2114 |
by Deleted User06 Jun 2019 10:07 PM |
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1 Replies and 2273 Views
Seamless Mosaic problem 2273 1
Started by Deleted User
I have problem with Seamless Mosaic tool. I would like to save my seamline, But when I try to restore it I get the message: 'The scene names in the vector must match the scene names for the mosaic'. What does it mean. When I have 4 rasters: LAN_2009_001, LAN_2009_002, LAN_2009_003, LAN_2009_004, how should I name my seamline I have tried i.e. LAN_2009_001.shp, but it still doesn't work.
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2273 |
by MariM22 May 2019 09:41 AM |
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1 Replies and 2301 Views
Problem by creating a connection graph 2301 1
Started by Deleted User
I made a sample selection in SARscape with SAR data, using a georeferenced shape and D.E.M. In the sample selection the input file was a multilooked .pwr file, so the output is a .pwr file. I have to input the .pwr file because the slc_list file is to small (5 kb) to be cut and because I have to process the images with the multilooking. The problem is that in the next step, the connection graph creation, ENVI tells me that the 20 or more input files has to be slc_list file, but I need to make th...
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2301 |
by MariM20 May 2019 09:07 AM |
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6 Replies and 2675 Views
NNDiffuse Pan Sharpening error 2675 6
Started by Deleted User
I try to do a big model with whole workflow of pre-procesing and I can not connect PanSharpening with Dark Substraction Correction. My model looks like bellow: multispectral rasters -> iterator -> radiometric calibration -> raster statistic -> dark substraction correction ->agregator -> iterator -> NNDiffuse PS -> -> panchromaticl rasters -> iterator -> radiometric calibration -> raster statistic -> dark substraction correction ->agregator -> Extract Element -> NNDiffuse PS -> ->...
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by Deleted User17 May 2019 12:47 AM |
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5 Replies and 5397 Views
How compute class stats over a ROI 5397 5
Started by Deleted User
Hi all,
I am trying to compute the classes statistics of a classification maps obtained from a masked raster. The masked pixels are No Data.
I am interested to compute the percentage of surface classified by each class. The class stats provide a percentage with respect on the total area of the raster, but i need the statistic value only for the not masked area.
Here below a briefly description of workflow in ENVI 5.4:
Right click on a class
Select Compute Class stats
Select the mask...
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5397 |
by MariM16 May 2019 05:31 AM |
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1 Replies and 1824 Views
the backgroud value of DEM after extraction 1824 1
Started by Deleted User
Hello, I have used the Dem extraction wizard for an Ikonos stereo pair images and I have found out after importing the tif file to Arcgmap that It takes into account the background value in the elevation scale. The value is -999 and I want to know if I can extract the dem without the background values.
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1824 |
by MariM13 May 2019 08:03 AM |
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4 Replies and 2047 Views
Radiometric & atmospheric correction of ASTER_L1T thermal bands 2047 4
Started by Deleted User
Hello, I have performed radiometric and atmospheric correction of ASTER_L1T thermal bands. Firstly, I have performed the radiometric correction and after that the atmospheric. Lastly, I did the emissivity normalization. More specifically, I have insert the images into ENVI 5.3 new UI, and then I performed the corrections (when I performed the radiometric correction I did NOT apply FLAASH). As a result I had 1 image instead of 5 (as my original thermal bands). My question is why I get only 1 ima...
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by MariM13 May 2019 07:58 AM |
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1 Replies and 1988 Views
generation of PPI error message in processing sentinel 2 mosaic data 1988 1
Started by Deleted User
I have a layer stack image which i made using the bands of 7, 8a, 11 and 12 of sentinel 2 data where each band is a mosaic of 7 sentinel images. the resolution is 20m. I executed the MNF operation. But when i try to execute PPI it generates an error message of 'an error occurred while attempting to load the data in to memory. Unable to continue. error: end of file encountered. unit 100'. My computer is windows 10 64 bit machine with a 20 GB ram. I want to know the reason for this error messa...
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1988 |
by MariM08 May 2019 01:00 PM |
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2 Replies and 1448 Views
ENVIReprojectGLT MODIS or VIIRS with seperate geo file 1448 2
Started by Deleted User
I'm trying to use the ENVIReprojectGLT task to georeference MODIS or VIIRS data when the geographic rasters are not in the same file as the image raster. I would like to use the new API rather than resort to the old classic api. The example in the documentation has those raster automatically generated with the 'openraster' function when opening an hdf5 file that includes the image data and the geographic data together. I'm not sure how to use the task when that information is coming from se...
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by Deleted User07 May 2019 11:14 AM |
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5 Replies and 4052 Views
Replace bad values Error 4052 5
Started by Deleted User
I have set of Landsat 7 images. I need to remove "black lines" from images and i use Remove bad Values tool. Tool works fine on most images but when i try to use it on some of them i get error like: "dem_bad_data_doit:
An error has occured during processing Error: "TRIANGULATE: Points are co-linear, no solution" The result may be invalid.
What's the problem And how to fix it Why some of images are processed fine and some not They are from same source (https://earthe...
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4052 |
by Deleted User29 Apr 2019 08:09 PM |
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7 Replies and 2092 Views
EO-1 Hyperion Orthorectification 2092 7
Started by Deleted User
Hello,
I am want to Orthorectify Hyperion images, what is the best way of doing so
Hyperion sensor is not defined in ENVI.
Best Regards
Mustafa
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2092 |
by Deleted User20 Apr 2019 11:00 AM |
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1 Replies and 1910 Views
Mathematical operation in Raster stack 1910 1
Started by Deleted User
Hi, I have a raster stack of 15 rasters and another stack of the same number of raster layers. Now I want to subtract one layer from another from two stacks. How can I do that quickly ENVI allows me to do calculations only in a single band basis. Is there any way to do operations in a stack quickly Thanks in advance.
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1910 |
by MariM18 Apr 2019 10:08 AM |
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5 Replies and 3088 Views
QUAC 3088 5
Started by Deleted User
*sorry if this is a duplicate post. I didn't see a confirmation that the other was submitted successfully, so am posting again.
I'm trying to run QUAC on a Hyperion image but keep getting the error "QUAC correction failed. Unable to extract the endmembers from input raster. Try a different sensor option or apply a mask." I tried this choosing Hyperion and choosing Generic/ unknown sensor. When I run it on a radiometrically corrected image, it says "QUAC correction failed. Max...
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by MariM01 Apr 2019 10:38 AM |
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2 Replies and 1296 Views
NDVI and Band math 1296 2
Started by Deleted User
Hello all, I have 2 images of the same are taken before and after a natural disaster. I converted them to NDVI images and now I want to see the differences between the 2 NDVI images to see where and how much changes occurred. I know I need to use band math, but not sure how to do it. Can anyone help Thank you
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1296 |
by Deleted User01 Apr 2019 09:19 AM |
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1 Replies and 2218 Views
Extending ENVI with IDL - read .hsi and .hdr files 2218 1
Started by Deleted User
Hi, I have .hsi and .hdr files (hyperspectral images) which I can open and process in ENVI. I tried using IDL and extend ENVI but these files would not be read. Please help me what codes or procedures to perform to achieve this first task. Thanks, Tiffany
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2218 |
by MariM01 Apr 2019 07:23 AM |
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27 Replies and 6193 Views
Hyperion Preprocessing 6193 27
Started by Deleted User
Can the Vertical stripe removal in the SPEAR tools of ENVI 4.7 be used for hyperion preprocessing and if yes kindly do send me details on how this tool works as the information about this tool is not sufficient in ENVI help.Expecting a reply soon.
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6193 |
by MariM28 Mar 2019 02:35 PM |