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2 Replies and 1876 Views
Statistics and null values 1876 2
Started by Deleted User
I am using the MODIS NDVI productwhich has a data range of -2000 to 10000 with a null value of -3000. When I run statistics on the file, or a classified image based on it, I keep getting a minimum value of -3000, not the real data values. I have set the 'Data Value to Ignore' parameter in the header file to -3000.
Is there any way to exclude these values when calculating statistics The statistics are bad because it is creating mean values that are too low.
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2 |
1876 |
25 Oct 2005 07:44 PM |
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0 Replies and 1989 Views
how to display wavenumber & wavelength in Z-profile window in ENVI 1989 0
Started by Deleted User
Hi,
I would like to display both wavenumber and wavelength on the X axis
(top and bottom) of the Z-profile window in ENVI. I can import one of
them say, 'wavenumber' for the bottom part but would like to know the
additional changes needed for the ENVI header file to import the
wavelength to be displayed on the top part of the axis. Y axis can be
imported easily.
ENVI header reads like this:
ENVI
description = {
Create New File Result &91Sat Nov 10 13:11:40 2001&...
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0 |
1989 |
24 Oct 2005 10:39 AM |
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0 Replies and 2076 Views
spectral library 2076 0
Started by Deleted User
hi to all,
I am applying some mathemaical expression on a spectral library with the help of band math. when I open the spectral library it shows a single band , but it has 242 bands. now my expression in band math wants to select two bands as input variable. Is someone tell me how could this be possible.....................
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0 |
2076 |
23 Oct 2005 11:52 PM |
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0 Replies and 1929 Views
Spectral Library 1929 0
Started by Deleted User
Hello:
I have a spectral library created for my in ENVI, the data is ASCII. I want converted this data in a image or pixel for used the 'spectral feature fitted'. (SFF).
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0 |
1929 |
23 Oct 2005 11:52 PM |
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0 Replies and 1924 Views
11 bit format 1924 0
Started by Deleted User
Some of the ASTER data can be delivered in 11 bit format.
When ENVI imports this kind of data, it is written to a 16bit image channel
Is it possible to specify 8bit as output band type
thanks
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0 |
1924 |
12 Oct 2005 04:19 AM |
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0 Replies and 2713 Views
Sun glint removal from imagery 2713 0
Started by Deleted User
Greetings,
I have some hyperspectral images over a water body that are affected by sun glint.
Does anyone have any code or good ideas on how to remove or decrease the effect of the glint in my images.
Appreciate any comments.
Thanks
Dan
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0 |
2713 |
11 Oct 2005 06:41 AM |
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0 Replies and 1837 Views
stretching 1837 0
Started by Deleted User
I have some MODIS chlorophyll data that I'm trying to visualize with a log stretch. But I have some problems finding out how. Can anyone help
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1837 |
10 Oct 2005 04:00 AM |
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0 |
2027 |
07 Oct 2005 08:51 AM |
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0 Replies and 1680 Views
Process radar image 1680 0
Started by Deleted User
Could anyone please tell me how to process the radar image (CEOS format) into intensity / backscatter image
I have the following files, but i do not know how to utilize them in order to process into intensity image.
dat_01.001
lea_01.001
nul_dat.001
par_dat.001
vdf_dat.001
Thank you very much
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0 |
1680 |
06 Oct 2005 08:43 AM |
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0 Replies and 2048 Views
Import ENVI raster to ArcGIS 2048 0
Started by Deleted User
I want to import a large amount of ENVI rasters to an Oracle database using ArcCatalog via a ArcSDE-server. I have downloaded the DLL (ENVI Reader for ArcGIS 1.1 (Microsoft Windows NT 4.0, 2000, XP)) and installed it. This made ArcCatalog recognize the .dat-file and I can import it to the database. The problem is that I can not build statistics on the dataset and if I try to preview the dataset it is all white. Something has gone wrong here and I don´t know what to do. Can anyone please give me ...
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0 |
2048 |
04 Oct 2005 04:36 AM |
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0 Replies and 2092 Views
PCA statistics 2092 0
Started by Deleted User
When one computes statistics for Pricipal components Analysis, the matrix that appears for the eigen vectors has for column and row headings the name Band 1 band 2 etc up to the number of bands and components. Since both rows and columns headings are 'bands', which of the two (rows or columns) are the Principal components then Is it as traditionally written the columns or has ENVI got a different arrangement I want to compute the loadings for each band and I need to know whether the rows or th...
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0 |
2092 |
03 Oct 2005 12:45 PM |
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0 Replies and 1972 Views
Calculating statistics using a shape file 1972 0
Started by Deleted User
Hi!
We have a shape file with a large number of polygons, and we'd like to use this file to calculate statistics from images. The data are all georeferenced using the same projections etc. To do this, I have converted the .shp files into evf vectors, and these then into ROIs. However, while all the polygons are translated into different ROIs. However, the name of each ROI is the same (namely, the name of the .evf file), so when I calculate statistics, there is no way to know which polygon is wh...
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0 |
1972 |
28 Sep 2005 09:45 AM |
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0 Replies and 1769 Views
Coarsening Image Resolution 1769 0
Started by Deleted User
Could someone tell me how to coarsen the spatial resolution of imagery (in this case, Quickbird imagery) Any help would be greatly appreciated.
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0 |
1769 |
22 Sep 2005 01:44 PM |
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0 Replies and 2050 Views
programming envi : how to create a DBF file with a boolean attribute ? 2050 0
Started by Deleted User
Hi.
I can create a dbf file with the routine envi_write_dbf_file. But it is limited to numbers and strings. I need to do something similar with a boolean attribute.
Is it possible
Does anabody know a way to do that
Thanks.
Nicolas.
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0 |
2050 |
19 Sep 2005 05:53 AM |
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1 Replies and 1700 Views
correction in LUT table 1700 1
Started by Deleted User
I have been applied a ENVI built in function HIST_EXPORT_DOIT in my application because i want to change the DN value of my data by applying some manipulation on LUT . but i m unable to do it, Is there someone who tell me how to multiply each previus DN value by a factor by using LUT (look up table)
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1 |
1700 |
15 Sep 2005 07:02 AM |
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0 |
1765 |
13 Sep 2005 12:28 PM |
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1 Replies and 1839 Views
lineaments 1839 1
Started by Deleted User
Hello!
If anybody working on lineaments analysys in ENVI 4.1 and/or IDL 6.0
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1 |
1839 |
29 Aug 2005 06:47 PM |
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1 Replies and 1975 Views
mosaicking in ENVI 1975 1
Started by Deleted User
Greetings,
I am mosaicking a georeference image and have it almost complete, but I would like to fill in the gaps between two of my images. I would prefer to use the cutline feathering option, however Im a bit frustrated by the procedure. I know I need to use a polyline annotation to define the area I want to 'cut out' but how do I figure out the where that area is exactly in my image. The tutorials are not helping me either, so any advice from someone with experience would be a lifesaver! ...
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1 |
1975 |
29 Aug 2005 06:32 PM |
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0 Replies and 1791 Views
Silica mapping/Determining the Gaussian Minimum 1791 0
Started by Deleted User
Anybody read...
Mapping variations in weight percent silica measured from multispectral
thermal infrared imagery—Examples from the Hiller Mountains, Nevada,
USA and Tres Virgenes-La Reforma, Baja California Sur, Mexico, S.J. Hook et al. / Remote Sensing of Environment 95 (2005) 273–289
...
It mentions that 'The weight percent silica value for a given pixel depends on wavelength position of the minimum of the best fit Gaussian to the emissivity spectrum.'
I'd like to apply this ...
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0 |
1791 |
28 Aug 2005 12:04 AM |
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0 Replies and 1564 Views
Exportation of DEM 1564 0
Started by Deleted User
I imported a Geotiff DEM(SRTM) into ENVI and as there were some bad cells(values of 32567) I used the `Replace bad value` routine and I would now like to export the DEM from ENVI. It seems that the options are limited. What software will read an ENVI modified DEM file
I tried to import the file into GlobalMapper as it does appear to accept ENVI DEM files but the software did not accept the modified DEM. It did originally accept the raw DEM geotiff with the bad values.
Any suggestions wou...
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1564 |
24 Aug 2005 08:23 PM |