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1 Replies and 1467 Views
Classification Neural Net 1467 1
Started by Deleted User
Hi,
I have a problem with classification by neural net in ENVI. I need to classify SPOT with 4bands and I have 5 ROIs classes(forest, water, ...) If I choose Maximum Likelihood, everything is OK and perfect. But I have to make a comparison Maximum Likelihood and Neural Nets Classification.But the Neural Nets reports an error:
envi_neural_net_doint: An error has occured during processing
Error:"Attempt to subscript with K is out of range." The result may be invalid.
My paramet...
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1 |
1467 |
10 Aug 2012 05:35 AM |
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1 Replies and 1076 Views
LiDAR Toolkit on Mac 1076 1
Started by Deleted User
Hi all,
I want to add the LiDAR Toolkit on ENVI 4.7 on a Mac. I know the "save_add directory" must be edited, but not sure how to get there. I don't use IDL yet, so any instructions I've found are not so intuitive.
Does anyone have any directions on this Thanks in advance!
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1 |
1076 |
09 Aug 2012 03:27 PM |
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5 Replies and 1280 Views
Spectral Resampling 1280 5
Started by Deleted User
I am trying to resample an archer image to Landsat 5. Originally the archer was in PCI format, which was saved as an ENVI file. From there I used the default Of 0 for bad values. When I ran the resampling the output image had no values in RGB. In other words I got no image. Any thoughts
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5 |
1280 |
07 Aug 2012 07:44 PM |
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4 Replies and 883 Views
Mosaicking images? 883 4
Started by Deleted User
How do I mosaic 4 images together so they appear as one big image without any black lines in between them Basically, i want them to appear next to each other... Pixel based
Using ENVI 4.8
Thanks!
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4 |
883 |
07 Aug 2012 02:26 PM |
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3 Replies and 1145 Views
extracting points elevations from satellite images 1145 3
Started by Deleted User
Hi All,
Can anyone help me out on the best and most simple way of extracting point elevation from satellite images. I would like to draw a profile line over a path on the image and extract the elevations along such path. thanks
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3 |
1145 |
06 Aug 2012 12:41 AM |
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1 Replies and 1190 Views
Problem with REIP 1190 1
Started by Deleted User
Hi,
I have problem with calculation Red Edge Inflection Point. I need to calculate it for my WorldView-2 image. At first I orthorectified this image and than I used Quick Atmospheric Correction, so it should be reflectance now. I want to calculate REIP, I tried this options:
700.0 ( ( ( ( float (b3) float (b4) ) / 2.0 ) - float (b3) ) * 40.0 ) * ( 1 / ( float (b4) - float (b3) ) )
((((((b3b4)/2)-b3)/(b4-b3))*40)700)
After using the first formula I get the image with value 720.00 on ...
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1 |
1190 |
04 Aug 2012 09:50 AM |
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0 Replies and 1223 Views
Testing sample sets for accuracy assessment 1223 0
Started by Deleted User
Dear All,can somebody kindly help me:
i have to choose 2 independent sets in classifikation of land use as:
Training sample set for classifikation procedure
Testing sample set for accuracy assessment
In "Generate Random Sample"-toogle i can define ROIs for training set (in my example should be equalised random sampling= 240 pixels for training set) and conduct any classifikation. But i do not understand, how should i make a testing set only for accuracy assessment (with other sampl...
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1223 |
04 Aug 2012 06:24 AM |
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4 Replies and 1416 Views
Amateur IDL-ENVI problem with Band Math 1416 4
Started by Deleted User
Hi, I am amateur in IDL and ENVI
I have a problem. I am working with 2 arrays of 1440 x 720 and I made a little function in IDL to run in ENVI and despite that I could compiled it without any problem in IDL and ENVI, when I tried to run in Band math, IDL console tell me that
“Expression must be a scalar or 1 element array in this context: .”
It is the function:
FUNCTION dir_viento, b1, b2, dbl=dbl
Wx = b1
Wy = b2
Grad = DOUBLE (180) /!DPI
Rad = !DPI /DOUBLE (180)
...
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4 |
1416 |
30 Jul 2012 12:13 PM |
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3 Replies and 1088 Views
How to overlay one Landsat image to cover only the data gaps of another 1088 3
Started by Deleted User
Hi, I have 2 Landsat images from 2 years, one with the scanline corrector working, so there is clear image (with no data gaps) while the other has data gaps caused by the failure of the scanline corrector. I have created a mask of the data gaps and now want to overlay the missing information from my first clear image onto the areas where the data is missing from my second image. Could anyone help with this
Many thanks in advance.
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3 |
1088 |
27 Jul 2012 09:33 AM |
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1 Replies and 1145 Views
question 1145 1
Started by Deleted User
Hello
I downloaded ENVI 5 but I do not like it. Can I download ENVI 4.8 and using same license.
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1 |
1145 |
27 Jul 2012 02:16 AM |
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3 Replies and 1186 Views
Problems with EVI 1186 3
Started by Deleted User
Hi Everyone, im having real problems trying to get my EVI calculations to work. Im using Landsat data and band math to create an EVI image for each data set. The formula i have been using is this:
2.5 *( (float(B4)-B3)/(B46*float(B3) - 7.5 *float(B1)1) )
But all the results seem to be a negative value an the grey scale evi output image seems to be inverted in colour, so the areas that should be dark are bright and vise versa.
Any help would be hugely appreciated as ive been stuck on this f...
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3 |
1186 |
25 Jul 2012 09:12 AM |
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0 Replies and 1028 Views
Problems with EVI 1028 0
Started by Deleted User
Hi Everyone, im having real problems trying to get my EVI calculations to work. Im using Landsat data and band math to create an EVI image for each data set. The formula i have been using is this:
2.5 *( (float(B4)-B3)/(B46*float(B3) - 7.5 *float(B1)1) )
But all the results seem to be a negative value an the grey scale evi output image seems to be inverted in colour, so the areas that should be dark and bright and vise versa.
Any help would be hugely appreciated as ive been stuck on this f...
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0 |
1028 |
25 Jul 2012 09:12 AM |
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7 Replies and 1174 Views
Matching with multitemporal scenes 1174 7
Started by Deleted User
Hello!
I `ve been working with map image-to-image registration to match 5 RapidEye-Scenes (multtemporal, same georeferencing and spatialspektal size, but they have to be match), i need it to coduct later combined classifikation from these 5 multitemporal data (from 2011,Juni-August). My question is, whether this method of image-to-image registration could be suitable for this art of matching Is there another good method in ENVI-Classic Programm for this purpose
I already tried to work with ...
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7 |
1174 |
22 Jul 2012 12:42 AM |
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1 Replies and 1092 Views
Error in Envi modis tool kit 1092 1
Started by Deleted User
I am getting an error while executing Modis tool kit in ENVi it says "Unable to aloocate memory to make arrat, Result may be invalid".
The file i am getting after this message is just an image and does not have ANY ATTRIBUTE DATA.ANY HELP ON THIS
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1 |
1092 |
18 Jul 2012 11:32 PM |
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1 Replies and 1159 Views
resclae using band math 1159 1
Started by Deleted User
I am trying to rescale a raster into a 1-10 scale but not sure about the min and max operators.
Is this correct (((b1)-(b1b1)-(b1
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1 |
1159 |
18 Jul 2012 03:52 PM |
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1 Replies and 876 Views
ENVI 5.0 default preferences 876 1
Started by Deleted User
Is there a way to change the ENVI 5 default preferences for all users In 4.x and Classic I can change the envi.cfg file so any user opening ENVI will, by default, have their input and output directories pointing to the server rather than the local C: drive. Students can be instructed to set preferences, but each time they sit at a different PC they will NOT remember to change the preferences.
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1 |
876 |
17 Jul 2012 03:07 PM |
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1 Replies and 1236 Views
Problem with NEURAL NET CLASSIFIER 1236 1
Started by Deleted User
Dear Users,
trying to conduct classifikation with Neural Net i had this error message:
"envi_neural_net_doit: An error has occured during processing
Error: "Attempt to subscript PtHeapVar944 with K is out of range. The result may be invalid" "
WHAT DOES IT MEAN, WHY I CANNOT WORK WITH NEURAL NET CLASSIFIER
Thanks a lot!!
Nadia
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1 |
1236 |
12 Jul 2012 11:48 AM |
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1 Replies and 984 Views
Ground Truth data on RapidEye with ROIs 984 1
Started by Deleted User
Dear All!
I have one problem, i have a RapidEye Scene in ENVi 5 (Student Version) and i also have map with Ground Truth data (crop fields that are with codes for each crop and land use type). So, now i have to create ROIs from this data on this satellite scene.
Just by "create a ROI"- its possible to draw polygone, polyline etc. but the fields on satellite scene are pretty small to distinguish them, as they are on normal topographic map. Can someone help me pleaseee Thanks!!!! Nadia
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1 |
984 |
12 Jul 2012 08:23 AM |
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1 Replies and 862 Views
image and vector superposition 862 1
Started by Deleted User
Hello
I have a georeferenced image witch on I superimpose a vector file .
On the general zoom the topics on the image and the vector file are superimposed but as soon as I zoom different the entities are not superimposed any more.
that to make
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1 |
862 |
10 Jul 2012 05:28 AM |
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0 Replies and 1418 Views
DISPEC Routine 1418 0
Started by Deleted User
Anybody worked with DISPEC routine (ref: Page 5 of link http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/40148/1/JPL-PUB-92-2.pdf) to calculate spectrometric information and absorption parameters. Please share me the routine or let me know the source of the routine from where I can get it.
Thanks in advance.
Partha Ghosh
Partha.GhoshNIIT-Tech.Com
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0 |
1418 |
04 Jul 2012 03:13 AM |