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0 Replies and 1467 Views
Problem of SPEAR Google Earth Bridge 1467 0
Started by Deleted User
I am trying to use the SPEAR Google Earth Bridge. However, when I added a georeferenced file, it said 'Image datas can not determined for the following images'. Although&160;I tried different&160; georeferenced&160; images, I failed. Did you ever meet such a problem
&160;
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0 |
1467 |
18 Oct 2009 02:30 AM |
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0 Replies and 1351 Views
temperature - rescale? 1351 0
Started by Deleted User
After using Emissivity Normalization to get temperature I have found the values to be very high. Do I need to rescale these values (e.g. divide image by 10000)
Any feedback will be greatly appreciated.
&160;
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0 |
1351 |
16 Oct 2009 02:55 PM |
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11 Replies and 1736 Views
emissivity - data scale factor 1736 11
Started by Deleted User
I am trying to calculate temperature and emissivity using the Emissivity Normalization method in ENVI 4.7. How can I find out my thermal images data scale factor and wavelength scale factor so I can convert them to the required format
Thanks
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11 |
1736 |
16 Oct 2009 02:40 PM |
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3 Replies and 1387 Views
Texture Filtering and Masking Roads Problem? 1387 3
Started by Deleted User
Normal
0
false
false
false
MicrosoftInternetExplorer4
Hi ENVI community,
I'm having a problem with masking out features of a texture filter analysis. I'm hoping someone on here can help me out. Thanks in advance!
Problem: My area of interest (military base) is heavily fragmented with roads. I want to filter for texture (both first and second order in various window sizes) a satellite image over this area of interest. However, I do not w...
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3 |
1387 |
15 Oct 2009 02:05 PM |
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2 Replies and 1343 Views
T-E separation 1343 2
Started by Deleted User
Hello all,
When I use emissivity normalization the temperature output is no longer georeferenced. Has anyone else had this problem Am I doing something wrong
Thanks
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2 |
1343 |
14 Oct 2009 12:40 PM |
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0 Replies and 1327 Views
dtm files from Inpho Match-T and ENVI 1327 0
Started by Deleted User
Hi!
I´ve run into a problem when attempting to import files generated in Inpho´s Match-T DSM Generator into ENVI. The files are in a file format that ENVI doesn´t seem to recognise (*.dtm). Has anyone encountered the same problem and found a way past it I´d appreciate any ideas on how to break this puzzle.
Cheers,
Ann-Helen Mäki
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0 |
1327 |
14 Oct 2009 06:02 AM |
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4 Replies and 1024 Views
DEM extraction - RPC information 1024 4
Started by Deleted User
Hi
I am testing the DEM extraction modules with&160;a set&160;of GeoEye-1 stereo images, but have&160;a problem:
To create an exact DEM one&160;needs to utilize the RPC (rational polygon cooeficient) information, which comes with the images in two separate files. But&160;how to do this when the DEM&160;wizard does not ask you for the RPC information
I also tried to associate the RPC to the images&160;prior to&160;starting the DEM extraction, but&160;this gives another problem as&16...
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4 |
1024 |
13 Oct 2009 05:56 AM |
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1 Replies and 1495 Views
Georeferencing MODIS IMAGES that has FOR LOOP function 1495 1
Started by Deleted User
Hello,
Please help.&160; I have many MODIS images to georeference.&160; The ENVI basic tool is capable of doing it one image at a time.&160; Is there any available script to georeference many images say the For LOOP function and that files to be georeferenced will be contained in an INPUT folder similarly with the georeferenced file where it shall be placed on OUTPUT folder.
&160;
Thank you.
Cecil
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1 |
1495 |
13 Oct 2009 02:35 AM |
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1 Replies and 995 Views
Spot NDVI (S10) projection in ENVI 995 1
Started by Deleted User
Dear all,
I'm new in this forum and I like the professional discussions in this forum. I've a question regarding Spot S10 NDVI. I dowloaded the images from Spot Vgt website and the come as HDF are&160; unprojected. The images are in geographical coordinates (WGS 84) as per the header information and an attached&160; ASCII text. However, they are not georegistered and hence the fields for northings and eastings are missing values. I want to convert the images in geographical coordinates and th...
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1 |
995 |
11 Oct 2009 02:17 AM |
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3 Replies and 1173 Views
image projection using the latitude and longitude of another image 1173 3
Started by Deleted User
Hi folks!
It may sound stupid but I cannot find a way to do the following...
I have two remote sensing data cubes, which cover almost the same geographic area, showing some misalignment between them (some shifting and a small difference of spatial resolution). I also have the latitude and longitude information of both images for every pixel. One cube is slightly smaller than the other (601x450 and 604x450).
I would like to project the small image using the coordinates of the other one, so bo...
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3 |
1173 |
09 Oct 2009 10:22 AM |
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1 Replies and 3353 Views
Define Wavelength - Vegetation Indices 3353 1
Started by Deleted User
Dear All:
I'm trying to use the Vegetation Analysis -> Vegetation Index Calculator as well as the other modules in the list. However, I get the following error message: "Wavelengths must be defined to calculate vegetation indices". I am working with GeoTiffs. I went to the header file and tried to define the wavelengths through the Edit Attributes --> Wavelengths but there is only space for one value of a wavelength while Landsat (the imagery I'm working with) bands cover a range of...
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1 |
3353 |
07 Oct 2009 11:51 AM |
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3 Replies and 1313 Views
scaling integers value of pixel to convert it to float (real numbers) 1313 3
Started by Deleted User
I need to derive sensor zenith and solar zenith angles from satellite image particularly MODIS MOD021KM calibrated radiances 1km.&160; I was told that all these data I need is from other product which is also a calibrated radiance but of 5KM resolution.&160; When I download this file, I found that the data are of integers.&160; In order to have the float value (real number) said data set must be scaled.&160; Please provide me detailed procedure on how to convert integer to float&160; Thank...
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3 |
1313 |
30 Sep 2009 10:53 PM |
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1 Replies and 1119 Views
How to create a classified image from LIBSVM? 1119 1
Started by Deleted User
Hello. I have a 3-band ASTER image that I classified. I exported the training and testing pixels as ASCII and used LIBSVM to do the classification. I got close to 95 accuracy. LIBSVM also gave me the proper SVM parameters (slack and penalty). What I want to do now is bring these back into ENVI somehow so that I can get a classified image to compare with the maximum likelihood and neural net classification images that I derived completely with ENVI.
How can I go about using my LIBSVM work...
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1 |
1119 |
30 Sep 2009 12:39 AM |
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5 Replies and 1465 Views
Georeferencing - creating script in ENVI to georeference HDF files by batch 1465 5
Started by Deleted User
May I request a step-by-step process on georeferencing multiple *HDF files of MODIS MOD21KM - calibrated radiance 1km.&160; I heard a script can be created but am not familiar with scripting either.&160; I appreciate if you could provide answer to my problem.&160; Thank you. - Cecilia
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5 |
1465 |
29 Sep 2009 09:26 AM |
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3 Replies and 2029 Views
Deriving Solar Zenith Angle and Sensor Zenith Angle from MODIS images 2029 3
Started by Deleted User
Hello Everyone,
I am a new user of MODIS images in ENVI and IDL.&160; I have several questions to ask as follows:
How to do georeferencing by batch mode&160; I have downloaded daily MODIS images (calibrated radiances 1km) for several months (target to get 1 year worth of data), which I need to process to derive the Global Irradiance.&160; But first I need to georeference it.&160; Using ENVI tools is easy but you have to do this one image at a time and considering the volume of the d...
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3 |
2029 |
29 Sep 2009 03:13 AM |
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0 Replies and 1425 Views
EO-1 Hyperion and Ali data 1425 0
Started by Deleted User
Hello everyone! - what is a best way to open standart Hypperion data from USGS. Product is - L1T All channels are in tiff format - there are 242 channels!!! - there is no standart Import menu for EO-1 data! - and step by step downloading approach of stack layers function is not such a good way!!! :) MAy be I have pass some thing!!! - can you help me with it. It is 242 tiff files, README.txt, *.fgds and *.L1T in package.
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0 |
1425 |
21 Sep 2009 05:17 AM |
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0 Replies and 1126 Views
Spatial Statistics 1126 0
Started by Deleted User
Hi ALL,
I would like to compute getis ord * statistic (standardised version getis ord) for a remotely sensed data using ENVI on a 3*3, 5*5, 7*7 and 9*9 kernels. ENVI provides only the getis ord (Not standardised) and this ignores the central cell. Nonetheless, I do not comprehend the various options of neighbourhood (rook, queen, etc) provided with the application. Even so after computing the spatial statistic using default settings, how then can I display the bar scale of the Getis index to se...
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0 |
1126 |
18 Sep 2009 02:05 AM |
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0 Replies and 1120 Views
test 1120 0
Started by Deleted User
test
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0 |
1120 |
17 Sep 2009 11:35 AM |
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0 Replies and 1490 Views
Georeferencing MODIS images 1490 0
Started by Deleted User
Hi
I have been using Modis level 1b images (MOD02QKM and HKM) to create true colour images of areas of the Greenland Icesheet, with the aim of classifying surface lake areas.&160; I have been georeferencing both products&160;using&160;Envi into UTM format.&160;&160;MOD02QKM has a 250m resolution and&160;HKM has a 500m resolution.&160;&160;After georeferencing I resize &160;the HKM file to 250m.&160; When both images are opened and the displays are linked, they do not match up exactly,...
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0 |
1490 |
15 Sep 2009 09:05 AM |
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1 Replies and 1218 Views
pan-sharpening quickbird 1218 1
Started by Deleted User
hello-
i'm pan-sharpening quickbird imagery (mspan) i recently downloaded from digitalglobe and am using the gram-schmidt spectral sharpening tool. i selected my low resolution image, then chose the corresponding pan image. on the next dialog box, you can choose the method for low resolution pan and i chose 'create by sensor type', then chose quickbird, chose resampling method and gave this file an output folder and name. i then received an error 'the selected low resolution input file do...
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1 |
1218 |
15 Sep 2009 09:00 AM |