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0 Replies and 1574 Views
How do I access a rater attribute table? 1574 0
Started by Deleted User
Hi, all --
I am a newbie to ENVI, but what I've seen so far of ENVI 5.0 is really impressive and I want to adapt my remote sensing course to use it. I have been unable, however, to find anything in ENVI analogous to the raster attribute table of ERDAS. If I have a thematic image -- e.g. a raster soils map -- where a significant attribute is the soil series, how do I show these attributes It would seem that ENVI is a lot more flexible than ERDAS on continuous images, and there's the "c...
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1574 |
04 May 2012 02:09 PM |
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0 |
2060 |
04 May 2012 10:45 AM |
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1 Replies and 1741 Views
Overlay ROI files? 1741 1
Started by Deleted User
I'm new to remote sensing and ENVI. I have two images, one a panchromatic aerial photo and one a NAIP image, that I am using to look at changes in treeline/tree density. I have already identified all the ROI's I need in each image. Is there any way to overlay two separate ROI files I thought it would be an effective way to show any change--to have the ROI's from the earlier image overlaid upon the more recent image. Maybe this is not possible Thank you in advance for your insight.
Kim
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1 |
1741 |
03 May 2012 06:48 PM |
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0 Replies and 1876 Views
Creating a Simple Orthographic Map 1876 0
Started by Deleted User
Hi, I'm new to ENVI but am familiar with the IDL MAP_SET commands used to create an orthographic map of the globe and display it.
So I have a very basic question. How does one go about creating and displaying such a map in ENVI.
I found some online docs about creating an empty image and then defining a map projection for that image. I did this and picked "Create World Boundaries" (Under the ENVI "Vector" Menu). But the results do not look correct. It's not Orthogra...
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1876 |
03 May 2012 05:13 PM |
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1 Replies and 1650 Views
NED DEM will not display in ENVI 1650 1
Started by Deleted User
I'm a novice ENVI user and I am having trouble opening a USGS NED DEM. I have an 1/3 arc second NED DEM that was downloaded as GeoTiff, mosaicked and projected to UTM zone 18 in ArcGIS. I am now trying to open it in ENVI. I have tried the .tif file, the world file (.tfw) and neither have worked. I either get a "not a valid file" message or the file opens but displays with every pixel the same value (a flat grey image). I have tried to open it using Open Image menu item and the To...
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1 |
1650 |
03 May 2012 07:14 AM |
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2 Replies and 1773 Views
PPI threshold 1773 2
Started by Deleted User
Hi,
What is PPI threshold value (default 2.5). How to decide what should be the threshold value for your data
Thanks in advance.
Regards
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2 |
1773 |
03 May 2012 01:10 AM |
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0 Replies and 2438 Views
Introducing ENVI 5 – The Next Generation Of Image Analysis 2438 0
Started by Deleted User
Exelis Visual Information Solutions is pleased to announce the release of ENVI 5.0, the latest version of the premier software solution for visualizing and analyzing geospatial imagery. ENVI 5 was developed to introduce efficiency and speed into the previously complex workflow of converting raw imagery into actionable information. The new streamlined user process benefits today's changing imagery consumer, from the GIS professional who needs to enhance a mapping applications for better geographi...
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2438 |
01 May 2012 02:00 PM |
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3 Replies and 1595 Views
Spatial shift in SWIR bands of Hyperion data 1595 3
Started by Deleted User
Hyperion L1R data has spatial shift of 1 pixel in SWIR bands at column 128. How to correct this misalignment.
Any idea correcting this in ENVI or any other application.
Thanks,
Anuj Singh
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3 |
1595 |
25 Apr 2012 01:00 AM |
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1 Replies and 1308 Views
Apply Forward MNF Transform to Spectra 1308 1
Started by Deleted User
I applied a forward MNF transform to ASD spectra in order to create an MTMF classification endmember. The MNF scores range from -40 to 40 for the ASD transformed spectra while the MNF transformed HyMap image has scores that on average range from -2 to 2. (I first resampled the ASD spectra to HyMap bands before applying an MNF transform). I checked to make sure that the number of input bands used to calculate the statistics for the HyMap MNF transform was the same as the number of output bands.
...
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1 |
1308 |
24 Apr 2012 06:02 PM |
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0 Replies and 1545 Views
Apply multiple masks in a single multitemporal classification 1545 0
Started by Deleted User
Hi All,
I want to classify 5 Landsat images together, of the same path/row but of different date. What I used to do is to stack the images together and the result in this case is one images with 30 bands (6 bands per image). But in order to classify them all I have normally to apply one mask.
What I am wondering is… if it possible to apply different masks (0 or 255 value to particular pixels) to different images, and then to classify them all together.
In that case I am thinking that ...
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1545 |
24 Apr 2012 04:27 AM |
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2 Replies and 1582 Views
SWIR- Error 1582 2
Started by Deleted User
I'm trying to edit Headerinfo RPC/RSM for ASTER-SWIR bands its giving error "error importing RPC coefficient parameters". Help appreciate.
Thanks
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2 |
1582 |
22 Apr 2012 09:35 PM |
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1 Replies and 1854 Views
Flaash help for error 1854 1
Started by Deleted User
problem: the flaash program exited with the following errors:
ACC error:adjacent5:smcutoff
IDL error:
HISTOGRAM: ILLEGAL binsize or max/min.
ACC_ADJACENT5
ACC_HYPER2
ACC_ACC
ENVI_ACC_EVENT
ENVI_FLAASH_PROCESS_MANAGER
IDLRTMAIN
$MAIN$
this is the error while processing.
help me anyone in this.---- thanks in advance
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1854 |
21 Apr 2012 03:35 PM |
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2 Replies and 2431 Views
READ or VIEW WORLDVIEW-2'S METADATA (.IMD) 2431 2
Started by Deleted User
Hii guys...
i'm a newbie in ENVI. Now i use that to finish my thesis, but i have some problem to use ENVI.
my thesis is about bathymetry derivation, therefore need information in IMD file such as distance between the earth and sun at the time of collection, solar irradiance, solar zenith angle to calculate the formula. but i can't find it within IMD file. i don't know how to read or view the information inside that file.
Anyone can help me
i need a fast respond guys...
th...
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2431 |
19 Apr 2012 10:29 PM |
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2 Replies and 1901 Views
FLAASH ERROR 1901 2
Started by Deleted User
dear all
I am facing problem with FLassh and it exit with following error. EAGLE DATA AIRBORNE 255 bands.
ACC error: h2oinv:h2oinv
IDL error: unable to allocate memory: not enough space.
some time it gave error : non blank pixel found .
and when tile is increased to 200 its exit in same way.
Many thanks
Prem
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2 |
1901 |
19 Apr 2012 09:45 AM |
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2 Replies and 1372 Views
Gram-Schmidt Spectral Sharpening problem 1372 2
Started by Deleted User
Hi dear all
I have some problem to make Gram-Schmidt Spectral Sharpening. Already i used low resolution and panchromatid data from ALOS. I dont know the result is not satesfied. Please make some effort about this matter. Thank you
Best, Hadi
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2 |
1372 |
18 Apr 2012 10:23 PM |
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2 Replies and 1320 Views
Orthorectification 1320 2
Started by Deleted User
Hi,
I have some problem with result of orthorectification my SPOT image. I work with SPOT Level 1b. I have some shapefiles of rivers. Both have the same projection, but the rivers doesnt fit on SPOT, there are shifted about 200 meters. So I decide to provide orthorectification. I created DEM in ArcGIS from contour lines (interval: 5m) by the help of Topo to Raster.
But I dont know how orthorectify my image correctly. I tried Orthorectification with RCP, but the result is wrong. I dont know wh...
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2 |
1320 |
16 Apr 2012 10:16 AM |
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2 Replies and 1557 Views
Need help to interpret the header file parameters of an epipolar image 1557 2
Started by Deleted User
Hi,
I want to know how to transform between image coordinates epipolar image coordinates in DEM extraction.
It seems all the parameters need to achieve this purpose are inside the header file, as I attached to the end of this email.
but I don't know how to interpret all the parameters inside the header file, such as: adj coef, dlt coef,kx, ky,parallax correction.
what's they mean How can I use these parameters to achieve the transformation
Thank you,
Regards,
Chris,
--...
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1557 |
12 Apr 2012 08:25 PM |
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1 Replies and 1483 Views
subpixel fractions 1483 1
Started by Deleted User
Hi
Is there an efficient or easy way to investigate / plot the subpixel fractions of a given pixel after abundance images are created using SMACC or Spectral Hourglass Wizard
Thanks
Lucky
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1 |
1483 |
12 Apr 2012 01:47 AM |
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0 Replies and 1415 Views
Orthorectify SPOT 1415 0
Started by Deleted User
Hi,
I have some problem with result of orthorectification my SPOT image. I work with SPOT Level 1b. I have some shapefiles of rivers. Both have the same projection, but the rivers doesnt fit on SPOT, there are shifted about 200 meters. So I decide to provide orthorectification. I created DEM in ArcGIS from contour lines (interval: 5m) by the help of Topo to Raster.
But I dont know how orthorectify my image correctly. I tried Orthorectification with RCP, but the result is wrong. I dont know wh...
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0 |
1415 |
11 Apr 2012 03:15 PM |
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3 Replies and 2435 Views
Output to ASCII 2435 3
Started by Deleted User
Hello,
I'm exporting many QuickBird Images into ASCII XYZ format. The problem is the file is way too large, 1-2 GB. I'm only interested in the pixel values that represent some physical meaning and not the zero values. Is there a way to leave out the zero values when exporting to an ASCII I'm also using IDL to do this, so I'm open to IDL code.
Thanks
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3 |
2435 |
06 Apr 2012 02:00 PM |