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1 |
1583 |
02 Dec 2008 02:23 PM |
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1 Replies and 1472 Views
New user of quickbird imagery in ENVI--couple of questions 1472 1
Started by Deleted User
Hi there.
I'm doing some archaeological work in Central Asia, and have been exploring some quickbird imagery.&160; I notice that the DN's don't seem to go between 0 and 255--apparently this is due to the fact that it works with 11-bit data&160; Ultimately, I would like to create a layer stack with the first 4 bands as Quickbird bands, and the rest as ASTER middle IR bands and do a bit of analysis.
Even if I'm working with QB alone, is it advisable to convert the imagery to a 0-255 scale, an...
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1 |
1472 |
01 Dec 2008 02:21 PM |
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4 Replies and 1554 Views
problem in ENVI_OUTPUT_EXTERNAL_FORMAT OR bug in ENVI4.5 1554 4
Started by Deleted User
I try to transform the envi file to erdas 8.7 and I use the function ENVI_OUTPUT_EXTERNAL_FORMAT
ENVI_OUTPUT_TO_EXTERNAL_FORMAT, dims = dims, /IMAGINE , FID=FID, $
pos=pos, OUT_NAME=out_name
the output file will be OK while the projection parameters are not right.
I use the alers conical equal area and the Longitude and latitude of origin is "0E,36N"
while the parameters of the output file is "0E 0N"
what's wrong with it , what should I do to solve this question
whe...
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4 |
1554 |
29 Nov 2008 02:49 AM |
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3 Replies and 1392 Views
exacty programming equivalent of save image as > image file 1392 3
Started by Deleted User
I need a programming routine that gives the exact equivalent of loading an image in the ENVI display, and using Save Image As > Image File > then leaving all the defaults as they are (Resolution =24 bit color ( BSQ) , output file type ENVI, and then saving the file with no file extension.
This method produces two files (and envi file and a header) that look identical to what you get by using envi_output_to_external_format, /envi
but there must be some slight difference as the programme i am us...
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3 |
1392 |
27 Nov 2008 04:09 AM |
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3 Replies and 1395 Views
Problems in georeferencing images with envi_glt_doit 1395 3
Started by Deleted User
Hi all, I am experiencing several problems in writing a code for georeferencing satellite data (MODIS, AMSR-E and also smaller images, eg 200x200 pixels). I am using the code I found in the ENVI help (which I attached at the bottom of the post). Unfortuately, when the ENVI_GLT_DOIT command is executed I get this error:
envi_built_glt_doit: An error has occurred during processing
Error:"The array must be a scalar in this context: ." Results may be wrong
I get this error independently...
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3 |
1395 |
23 Nov 2008 04:21 AM |
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2 Replies and 1185 Views
Using FLAASH with SPOT 5 imagery 1185 2
Started by Deleted User
I am relatively new to image processing and need to know how to convert SPOT 5 imagery to radiance so that I can use FLAASH for atmospheric correction.&160; Is there a tool for ENVI that can process this for me, or are there steps I will need to undergo in processing the data
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2 |
1185 |
21 Nov 2008 09:15 PM |
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5 Replies and 1584 Views
Orthorectifying without GCPs 1584 5
Started by Deleted User
Is it possible to orthorectify a digital photo without GCPs We are 2000 miles away from the site and cannot afford to collect them (We could possible collect them via Landsat). What we were provided with is:
- Digital and Hard Copy of Airphoto (Fiducials included).
- Camera Type (Wild RC 20), Lens and Focal Length, Filter Type and Scale.
- Center Point of Camera (X,Y,Z)
&160;
Thanks
&160;
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5 |
1584 |
20 Nov 2008 08:33 AM |
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0 Replies and 1132 Views
aster mineral ratios 1132 0
Started by Deleted User
Hi, I'm working on a L1A aster images in order to obtaingeological data. I'm using aster mineral ratio (by mminari) but I have a lot oh vegetation in the image... the L1A images is good for this purpose is good (since Envi apply the 1A to 1B correction when opening the image) or not do the result is heavily affected by the vegetation how can I 'filter' the vegetation effect (as maximum as possible I mean..) thanks antonio
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0 |
1132 |
19 Nov 2008 10:54 AM |
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4 Replies and 964 Views
aster mineral ratios 964 4
Started by Deleted User
Hi, I'm working on a L1A aster images in order to obtaingeological data. I'm using aster mineral ratio (by mminari) but I have a lot oh vegetation in the image... the L1A images is good for this purpose is good (since Envi apply the 1A to 1B correction when opening the image) or not do the result is heavily affected by the vegetation how can I 'filter' the vegetation effect (as maximum as possible I mean..) thanks antonio
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4 |
964 |
19 Nov 2008 10:54 AM |
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0 Replies and 1134 Views
aster dem noise 1134 0
Started by Deleted User
Hi, I'm working on aster images in order to extract dem. The dem extraction module is really fast and easy to use, but maybe my poor knowledge in the core of the process, result in a noisy output dem image. I used the maximum level (5), and a minimum correlation of .8 At a first look the dem is good, but there is a sort of granule noise with a z variation of 5 to 7 meters. Yes, I can use a filter routine but....: is a normal output the one I obtained (please, see a subsubset of the image at htt...
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0 |
1134 |
19 Nov 2008 10:47 AM |
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0 Replies and 1045 Views
aster dem noise 1045 0
Started by Deleted User
Hi, I'm working on aster images in order to extract dem. The dem extraction module is really fast and easy to use, but maybe my poor knowledge in the core of the process, result in a noisy output dem image. I used the maximum level (5), and a minimum correlation of .8 At a first look the dem is good, but there is a sort of granule noise with a z variation of 5 to 7 meters. Yes, I can use a filter routine but....: is a normal output the one I obtained (please, see a subsubset of the image at htt...
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0 |
1045 |
19 Nov 2008 10:47 AM |
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3 Replies and 1099 Views
How to plot time-series MODIS data? 1099 3
Started by Deleted User
Hi,there
I am a new user of ENVI, and have a question like this:
I got time-series MODIS data, and want to got a polt in which the X axias is the time (date) obtain from these data, and Y axias is the DN number (such as NDVI or EVI). How can I got it
Do I need to realize it by using IDL programming, or The ENVI has the function
pls reply in detail because I just learn ENVI from last week.
Many thanks for your help!
&160;
ps: I capy and paste this thread bucause I am not sure this topic...
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3 |
1099 |
17 Nov 2008 09:45 AM |
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2 Replies and 1147 Views
Preparing DEM in order to image Orthorectification 1147 2
Started by Deleted User
Normal
0
false
false
false
MicrosoftInternetExplorer4
I have a doubt about the georeference of the DEM when it will be using in order to orthoretification a image. In few words, the DEM must be register with the reference data, like a image reference or Ground control Point, or must be register with the image that is want to correct. For example, in the case of ASTER image and the DEM generated with their stereo pair bands, the DEM is register with the i...
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2 |
1147 |
15 Nov 2008 11:18 AM |
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1 Replies and 1551 Views
How to install SARscape 4.1 for ENVI 4.5? 1551 1
Started by Deleted User
I use a floating license for ENVI 4.5. The installation guide downloaded from the following link is the guide for installation of SARscape 4.0 for ENVI 4.5, not SARscape 4.1.
http://www.ittvis.com/download/download.aspurlProductCode=27
I followed this guide, but I was not prompted to input the serial number. After installation, I cannot use SARscape because it cannot find a license. Anyone can help me solve this problem Many thanks.
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1 |
1551 |
14 Nov 2008 09:30 AM |
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1 Replies and 1368 Views
How can a MASK file be used with a Convolution Filter? 1368 1
Started by Deleted User
I have lots of files with many null values (zero in this instance). I need to use Convolution Filters (High and Low Pass) on these files to reveal certain features, but the zeros severely bias the filtering. I can easy create a Mask file for the zero pixels, but how can I use this with the filters
&160;
Many thanks in advance.
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1 |
1368 |
14 Nov 2008 06:29 AM |
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3 Replies and 1014 Views
Felling detection using alos palsar data 1014 3
Started by Deleted User
Hey my first post here and a newbie to the envi enviroment also...
What i want to do is try to compare "alos palsar images" (plain images), the images are separated by time and sometimes they dont overlap perfectly. The comparison should be on the difference between db before cutting and after cutting... via a simple thresholding algorithm. This would preferably generate a vector (or raster) outlining the edges of what can be identified as clear cuts. This would then be compared again...
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3 |
1014 |
14 Nov 2008 03:44 AM |
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1 Replies and 1418 Views
using MASK in ENVI 1418 1
Started by Deleted User
I have a question in mask.
I am using envi and I want to mask the special value in the file
for example I want to mask the value below 100 and reserve the value great 100.
the mask menu will change the the value great than 100 to 1.
what should I do, I want to set the value below 100 to 0 while reserve the value great than 100.
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1 |
1418 |
12 Nov 2008 06:08 PM |
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5 Replies and 3273 Views
extracting digital numbers from ENVI image file 3273 5
Started by Deleted User
Hi,
&160;
I am rather new to ENVI and image processing in general. Can anyone pls tell me how I can extract the digital numbers (DN) from an image file Mine is a SPOT 4 image, so each pixel has 4 separate DNs as I am not using the panchromatic band. Do I need to write some program to do it, or is there some function in ENVI that can do it too
&160;
Thx in advance!
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5 |
3273 |
11 Nov 2008 08:35 PM |
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0 Replies and 1486 Views
maybe a bug IN MCTK 1486 0
Started by Deleted User
I use MCTK to process MOD021KM data and
I have to read solar zenith angle from the MOD03 data, for I have hundreds of data to process.
So I write a pro file based on yours to process them
But I found the MOD03 can not be processed,
I just change the MOD021KM ,the pro file is running OK, I don't know why this happen.
but I can process the MOD03 file by file in GUI.
What's wrong with me.
&160;
Thank you in advance.
&160;
&160;
&160;
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0 |
1486 |
04 Nov 2008 06:21 AM |
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1 Replies and 1496 Views
Legend in Quickmap 1496 1
Started by Deleted User
Dear friends,
I need to add a legend in my Map. Showing range of temperature for my MODIS images.
How could I do that in ENVI
Thanks.
&160;Idham
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1 |
1496 |
04 Nov 2008 01:42 AM |