Search this forum:
You are not authorized to create a new topic
Page 1 of 3123 > >>
 Last Post
3 Replies and 1057 Views Trouble Verifying Account  1057  3 Started by  Claire Leyden I received a verification e-mail, but when I click on it, I'm prompted to login. Once I login I receive the message 'You are using an unverified account. Please verify your account by clicking on the link contained in the verification email that has been sent to you.'
3 1057
by  Mari MinariJump to last post
11 Jun 2019 10:24 AM
17 Replies and 2506 Views Access Denied - Verification Pending  2506  17 Started by  Lisa Upton Why did I receive an "Access Denied - Verification Pending" error message
17 2506
by  Zoe KearneyJump to last post
22 May 2019 12:49 AM
8 Replies and 201 Views PCA-All the information are detected at the first band  201  8 Started by  Stavroula Giannakopoulou Hello everyone! I implemented at Hyperion data the PCA method, in order to reduce dimensionality. After the implementation, I observed the results and the 99.5 of the information is detected at the first band (the total number of bands is 112). So, I would like to ask if this is OK or I should look again at the procedure. Thank you very much in advance for your help!
8 201
by  Mari MinariJump to last post
09 May 2019 08:34 AM
1 Replies and 103 Views Dark Substraction Correction in Modeler  103  1 Started by  Anna Wojtowicz-Nowakowska What should I put in values when I use dark subtraction correction function in Modeler I have tried 'STATS.MIN' but I received massage box: Invalid parameter named Values. Expression must be a structure in this context: STATS.
1 103
by  Mari MinariJump to last post
25 Apr 2019 10:26 AM
4 Replies and 193 Views Worldview-3 CAVIS bands  193  4 Started by  Aysegul Daggez Hello everybody, I am going to get a Worldview-3 MS and SWIR bands for mapping alteration in our project area. For the accuracy of atmospheric correction do you think that I need CAVIS bands. Has anybody used CAVIS bands for this purpose before I will be very happy if you could you share your experiences about Atmospheric correction of WV-3 data. By the way I have FLAASH module. Thanks in advance Aysegul Daggez
4 193
by  Aysegul DaggezJump to last post
11 Apr 2019 01:41 AM
1 Replies and 211 Views Georeferencing - Orthorectification - Mosaicking  211  1 Started by  Stavroula Giannakopoulou Hello! I' m trying to apply a methodology that icludes georefercing - orthorectification and mosaicking. First of all because of the fact that the stripes of my images have lost their georeference, i import the right georeference from the spatial reference of images that have more bands. After that, i don't know if i should orthorectify my images and how. Is it essential Finally, because my images iclude parts that are repeated, i want to create a mosaic with those stripes of images so i don't ...
1 211
by  Mari MinariJump to last post
20 Feb 2019 11:10 AM
1 Replies and 106 Views How to calculate Nitrogen index (NDNI) from Micasense Rededge?  106  1 Started by  Stefanus Agung How to calculate Nitrogen index (NDNI) from Micasense Rededge
1 106
by  Mari MinariJump to last post
18 Feb 2019 04:57 AM
2 Replies and 203 Views PCA-Forward PCA  203  2 Started by  Stavroula Giannakopoulou Hello, I'm trying to implement the PCA method. I chose the bands that i think that they don't contain noise and i implemented 'Forward PCA Rotation New Statistics and Rotate'. After that i implemented th 'Forward PCA Rotation Existsing Statistics' but i can't figure out what should i change in this method. Should i choose the PCs that i think that they contain the information that i needAnd after that i should implement the Reverse PCA with the bands that contain information so as to have a ...
2 203
by  Stavroula GiannakopoulouJump to last post
14 Feb 2019 02:48 AM
4 Replies and 193 Views Represent pixels from different bands to an image  193  4 Started by  Stavroula Giannakopoulou Hello!I' m trying to represent at my image pixels from the same image but from different bads. In many bands i have very high values of reflectance because of the sensor. So i' m trying to find alla those pixels, which may be different from the one band to the other. Please let me know if you have any advice! Thank you very much!
4 193
by  Stavroula GiannakopoulouJump to last post
30 Jan 2019 10:39 AM
1 Replies and 180 Views Reflectance formula for SPOT 6  180  1 Started by  mega I have tried to calculate manually from digital number to radiance for SPOT 6. The result is the same with Envi Tool that is from DN to radiance. But, when I calculate manually from radiance to reflectance, the result is not the same with Envi Tool. So, how the formula to Envi to calculate radiance to reflectance for SPOT 6
1 180
by  Mari MinariJump to last post
24 Jan 2019 05:23 AM
23 Replies and 1251 Views FLAASH ACC Error  1251  23 Started by  kdsingh85
(Topic has multiple pages1 2 )
Hi Ben, I was trying to use FLAASH for my hyperspectral data atmospheric correction, but it is not processing any data and continuously showing error messages (ACC_AUTOCHAN: No water absorption channels selected). I fixed Error-1 by choosing water absorption band, but I never understand why it is still showing Error-2 (ACC error: convert7; IDL error: End of input record encountered on file unit:0); ACC_CONVERT7 ACC_HYPER2.... I am also attaching my FLAASH restore file. Let me know how I...
23 1251
by  Stavroula GiannakopoulouJump to last post
21 Jan 2019 11:35 AM
3 Replies and 190 Views Iterative SVM classification  190  3 Started by  Prabha Rupasinghe Hello, I am trying to iterate SVM classification for 100 outputs and I need classification error matrices for all 100 outputs so that I can perform some statistical analysis to compare time series. I need to do this for several time series for two sites, so I guess my only option is using IDL as this is lots of work to be done manually. I used the IDL example given in the link; for my images. I ch...
3 190
by  Mari MinariJump to last post
16 Jan 2019 01:08 PM
2 Replies and 255 Views Convert an image with BSQ to BIL or BIP  255  2 Started by  Stavroula Giannakopoulou Hello!I have a very simple question about my image. It' s an image that is radiometrically corrected with bsq interleave. I want to convert it to bil or bip in order to correct it atmospherically with the FLAASH method, but I don't know how!Any advice will be very useful! Thank you very much in advance!
2 255
by  Stavroula GiannakopoulouJump to last post
16 Jan 2019 10:10 AM
0 Replies and 19648 Views Access Denied - Verification Pending  19648  0 Started by  jeong hoon hyun As stated in the subject, why did I receive an 'Access Denied - Verification Pending' error message when I clicked 'Downloads' in my account page to download 'IDL'. How can my account be verified
0 19648
19 Dec 2018 03:35 AM
1 Replies and 221 Views BASE IS ARBITRARY error  221  1 Started by  kdsingh85 Hi, I can't open a file in ENVI associated with the below .HDR file. It is showing 'BASEISARBITRARY' error. Let me know what is this 'BASEISARBITRARY' means Thanks, Keshav ---------------.HDR File-------------------- ENVI description = &91;' Georeferenced Image built from input GLT. &91;'Mon Sep 17 16:36:09 2018'&93;'&93; samples = 1326 lines = 932 bands = 150 header offset = 0 file type = ENVI Standard data type = 4 interleave = bip sensor type = Unknown byte order ...
1 221
by  Mari MinariJump to last post
03 Dec 2018 07:17 AM
4 Replies and 262 Views Sub-pixel classification to Sentinel 2 images  262  4 Started by  Prabha Rupasinghe Hi, I am trying to use sub-pixel classification to Sentinel 2 image to map an invasive plant. I tried spectral hourglass wizard and tried to modify the endmembers by comparing the ROIs with my image to be classified. I need only 5 classes for my end product. Should I use only the endmembers for those 5 classes or should I use all the possible endmembers Also, the SAM classification results at the end is very poor. Can I use another set of ROIs I created to re-run another classification method (...
4 262
by  Prabha RupasingheJump to last post
10 Oct 2018 10:41 AM
1 Replies and 393 Views TOA conversion  393  1 Started by  zarifet I have a set of Landsat images (TM, ETM and OLI) for change detection analysis and I would like to convert Top of the Atmosphere OLI images from 16-bit to 8-bit. How to do it with ENVI 5.3. Thank you in advance
1 393
by  Mari MinariJump to last post
20 Sep 2018 08:37 AM
4 Replies and 1085 Views Combining classified images in ENVI  1085  4 Started by  Prabha Rupasinghe Hello, I am using Sentinel 2 images for image classification for a pretty large area. So I had to break the images into smaller blocks before classification and process them separately. Now I want to do a change detection for the entire area at once. Is there a way to combine these blocks into a one classified image in ENVI I could not find a specific tool for that. I tried to do it with ArcGIS, but couldn't find a good way to do it. I really appreciate any help on this. Thank you!
4 1085
by  Mari MinariJump to last post
21 Aug 2018 04:07 PM
1 Replies and 682 Views Color a number of pixels in a grayscale image  682  1 Started by  Malcolm Druett I have grayscale images and wish to highlight specific, fairly large groups of pixels in each image, e.g. by re-coloring those pixels. I have arrays of all the pixels to highlight for each image. Overplotting with a transparent mask seems like an arduous way to go about this. Is there a better way Thanks.
1 682
by  Mari MinariJump to last post
05 Jul 2018 06:54 AM
15 Replies and 648 Views ENVI - Estimate Noise Statistics From Data - Error  648  15 Started by  Vicente Jeria Hi everyone! I have this problem: when I am calculating the Estime Noise Statistics From Data in ENVI, I get the following error: 'The number of the pixels in the shift difference spatial subset should greater than the number of input bands. Please enlarge the spatial subset for noise statistics'. In other topic, I read that this problem may occur due bad bands, maybe identical min and max values or values equal to 0 and that I have to edit the header of image. In this sense, I don´t know how...
15 648
by  Mari MinariJump to last post
06 Jun 2018 06:33 AM
You are not authorized to create a new topic
Page 1 of 3123 > >>