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1832 |
02 Dec 2015 06:42 AM |
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2 Replies and 2158 Views
Editing spectral library (.SLI) header files 2158 2
Started by Deleted User
I have .ASD field spectrometer data that I exported to ASCII and then imported into ENVI and saved as a spectral library file (.SLI). Is it possible to create a bad bands list (or something similar) to mask out measurements affected by atmosphere I cannot find any way to direct way to edit the header file associated with my spectral library file either. When I run the "Edit ENVI Header" tool I get redirected to the Spectral Library Viewer when I open a .SLI, but the Spectral Library V...
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2158 |
30 Nov 2015 03:23 PM |
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2 Replies and 2393 Views
Reading landsat from AmazonWS TIF format 2393 2
Started by Deleted User
I am having problems reading the TIF format from the Landsat repository on AmazonWS . ENVI 5.1 does not recognize this single-band TIF format. I have to read it in QGIS then save it as GeoTiff and then open it in ENVI. Any idea
You can try at
http://landsat-pds.s3.amazonaws.com/L8/007/053/LC80070532015333LGN00/index.html
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2 |
2393 |
30 Nov 2015 07:17 AM |
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4 Replies and 2361 Views
WorldView-2 Calibration 2361 4
Started by Deleted User
<p>I am having trouble radiometrically calibrating WorldView-2 multispectral imagery. In the past, I was able to do so using ENVI&39;s Radiometric Calibration tool to produce nice results with appropriate spectral profiles. Now, my results for different images acquired at various times of year in different study areas are all unusable. Even using the exact same approach in ENVI with the same image that produced good results before now gives me unusable results. I have tried ENVI, IDL and ...
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4 |
2361 |
23 Nov 2015 07:57 AM |
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2 Replies and 2850 Views
remove cloud and shadow 2850 2
Started by Deleted User
How to remove cloud and shadow from ALI (Advance Land Imagery)
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2 |
2850 |
23 Nov 2015 05:40 AM |
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2 Replies and 2201 Views
Correcting color / white balance in R-G-NIR images 2201 2
Started by Deleted User
<p>Hello,</p>
<p>I have two sets of images of vegetation plots taken on an NDVI camera (standard digital camera modified to record red, green and NIR)</p>
<p>One set is correct and produces good NDVI values. This set was taken after the camera&39;s white balance was set to a white card which is visible in the image. The other set does not have white balance set (so it was on auto), although white cards are still visible in the images. This second set is currently n...
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2201 |
22 Nov 2015 08:13 AM |
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1 Replies and 2154 Views
Problem with Neural Net and SVM classification 2154 1
Started by Deleted User
<p>Hi,</p>
<p>I have a problem to get a reasonable result from classification. When I make classification using pixel/based class like maximum likelihood, minimum distance etc. everzthing is ok. But when i what to perfome Neural net or SVM classification i recive white raster. I tried with menz diffrent parameters and nothing help.The data which i want to classify are raster dataset from arcgis. I make in in envi 32bit mode because it is compatible with arcGIS, but i also tried...
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2154 |
19 Nov 2015 03:20 AM |
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0 Replies and 1722 Views
Annotations and Display Borders 1722 0
Started by Deleted User
<p>From a question a few days ago, I see that map keys and some other annotations are not yet available in ENVI 5. Programmatically, I can use envi_user_defined_annotation to construct an annotation file. I can display the data with envi_display_bands. I can obtain the display number, and I can even use the undocumented feature (2008 Forum question/answer that I found: thanks Mari!) ann_init to automatically display it. </p>
<p> However, I really wan...
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1722 |
18 Nov 2015 11:50 AM |
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1 Replies and 2334 Views
Batch &39;Build RPCs for Digital Frame Central&39; 2334 1
Started by Deleted User
<p>Is it possible to run &39;Build RPCs for a Digital Frame Central&39; Camera in batch mode We are processing a bunch of MSI data from framing cameras using batch processes, but currently are stuck manually using ENVI buttons/tools to georeference and stack images.</p>
<p><br />
</p>
<p>Brian Collins</p>
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1 |
2334 |
17 Nov 2015 01:57 PM |
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0 Replies and 1841 Views
Inconsistent Mahalanobis distance Results 1841 0
Started by Deleted User
<p>Task: compare the Mahalanobis distance from different region.</p>
<p>I made two raster datasets: 1) grassland from region A and grassland from region B; 2) grassland from region A and grassland from region C.</p>
<p>Then:</p>
<p>> created ROI using all pixels (e.g. roi_A1 means all grassland pixels located region A in dataset 1;roi_A2 means all grassland pixels located region A in dataset 2)</p>
<p>>&nbs...
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1841 |
13 Nov 2015 03:02 PM |
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1 Replies and 2725 Views
Opening WV1, WV2, WV3 data in ENVI 5.3 2725 1
Started by Deleted User
<p><span style="font-family: Arial;">I recently downloaded several images from Digital Globe. These include WV2 and WV3 images of my study site, and they are currently in *.til format. I have previously downloaded WV2 imagery of this area and successfully worked with it in ENVI (a previous version). My organization recently upgraded to ENVI 5.3. </span></p>
<p><span style="font-family: Arial;">I have two issues: U</span><s...
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2725 |
13 Nov 2015 12:52 PM |
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3 Replies and 2256 Views
UAV-Based Radiometric Correction 2256 3
Started by Deleted User
<p>Hi All- </p>
<p><br />
</p>
<p>Just curious, as I have non-calibrated UAV imagery. The radiometric correction tools in ENVI, at first glance (I am a novice) seem to be more focused towards satellite based sensors. Are there known tools or techniques in place to take care of issues such as Bidirectional Reflectance from low altitude UAV images </p>
<p>Basically, my current imagery is of RAW DN values. I wish to convert to radia...
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3 |
2256 |
11 Nov 2015 09:01 AM |
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2 Replies and 1761 Views
Legend fo r Relative water depth 1761 2
Started by Deleted User
<p>Hello,</p>
<p> There does not seem to be a way to create a legend from the Spear Tool relative water depth. Or is there and I am just missing it Anyway, this would be very handy to have. </p>
<p> </p>
<p>Thanks</p>
<p> </p>
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1761 |
10 Nov 2015 02:48 PM |
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2 Replies and 2350 Views
spectral math for performing mathematical operations 2350 2
Started by Deleted User
<p>Dear forum members,<br style="color: 222222; font-family: arial, sans-serif; font-size: 13px;" />
<br style="color: 222222; font-family: arial, sans-serif; font-size: 13px;" />
Lately I was trying to use ENVI software to perform a mathematical operation for some data cubes I collected from a hyper spectral system. The process can be summarized as below: the hyper spectral system usually generate 3 data cube fi...
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2350 |
10 Nov 2015 02:25 PM |
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2 Replies and 2175 Views
Adding legend to a time series 2175 2
Started by Deleted User
<p>Hi all,</p>
<p><br />
</p>
<p>I have processed a set of rasters (dat files) of the NDVI derived from MODIS and constructed a time series from my rasters using ENVI 5.3.</p>
<p>Now, I need to add a legend to this time series before export that as an animation. How could I do that in ENVI</p>
<p>I would appreciate if you could provide me with a detail answer, since I am not a professional user.</p>
<p>Thanks.<...
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2 |
2175 |
09 Nov 2015 08:00 PM |
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4 Replies and 1880 Views
Anomalous reflectance value in ASTER Band 9 1880 4
Started by Deleted User
<p>I have converted a set of ASTER level 1b data to reflectance using FLAASH algorithm. After reflectance conversion I am getting anomalous high value for band 9 for each and every pixel. Band statistics of both radiance and reflectance data have given bellow. Please help me to locate the problem. </p>
<p>Band Statistics of Radiance data</p>
<table border="0" cellpadding="0" cellspacing="0" width="384" style=&q...
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4 |
1880 |
09 Nov 2015 12:38 AM |
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1 Replies and 1696 Views
Classification methods 1696 1
Started by Deleted User
<p>I am using ENVI to do something relatively simple: I have taken photos of plants and want to categorize the different colors to count the number of pixels in each (i.e. green=living, dead=brown, background=white). The photos are tracking the same plants over time and have been taken in the same place against a white background. I have done unsupervised classification (kmeans) and supervised classification (maximum likelihood). The maximum likelihood produced the results I was looking fo...
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1 |
1696 |
05 Nov 2015 02:37 PM |
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4 Replies and 1925 Views
UAV-Ortho&39;s Histograms Alter when Opened in ENVI 1925 4
Started by Deleted User
<p>Hi All, </p>
<p>I will say first that I am a new ENVI user. I have proprietary UAV ortho products which have been calibrated for white and color balancing. They open fine in ArcGis. When I open them in ENVI, the histograms are slightly different than histograms from the same ortho images in ArcGIS. What process occurs when opening something in ENVI which causes this histogram/intensity alteration And is there any way to prevent this I wish to perform spectral anal...
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4 |
1925 |
05 Nov 2015 01:58 PM |
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1 Replies and 1806 Views
inputs for image/thematic change workflow 1806 1
Started by Deleted User
<p>When using these workflow tools, can one use uncorrected (atmospheric) data with DN values For example Landsat images downloaded directly from Earth Explorer, or the like. </p>
<p>Or is it recommended to first use QUAC or FLAASH and calibrate to reflectance</p>
<p>Thank you</p>
<p><br />
</p>
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1 |
1806 |
03 Nov 2015 02:27 AM |
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7 Replies and 5163 Views
NaN interplation 5163 7
Started by Deleted User
<p>Hello,</p>
<p>I&39;m currently using MODIS data and am running into problems with NaN values in the final product caused by clouds. I&39;m interesting in a simple way to spatially interpolate (fill in) these NaN values. Is there a menu function that can easily/simply do this without delving into the intricacies IDL</p>
<p>Thanks</p>
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7 |
5163 |
29 Oct 2015 05:36 PM |