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1 Replies and 1613 Views
MATH DO IT using 3 bands for EVI calculation 1613 1
Started by Deleted User
Hi guys,
Im just new in using IDL. Last time I posted here, I got help from this forum on how to use MATH DO IT for vegetation indices calculation, i.e. NDVI and LSWI which uses 2 bands for calculation (red and NIR). It worked! Thank you.
I tried using the same script for "EVI" and just changed the equation and bands since it uses 3 bands for calculation (RED,NIR,BLUE bands).
QUESTION about MATH DO IT:&160; Does it work for 3 input bands Or its just limited to 2 input bands If an...
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1 |
1613 |
09 Jan 2009 04:00 AM |
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1 Replies and 1303 Views
how to read img with projection inforamtion 1303 1
Started by Deleted User
i want to read image with projection inforamtion and locate pixel by the logtitude and lantidute.
Genarelly, which command i need.
i tried some command follwoing by the help. it doesn't work
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1 |
1303 |
07 Jan 2009 05:39 PM |
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0 Replies and 1538 Views
IDL VM crashes when DLM: PNG loaded 1538 0
Started by Deleted User
Hi All,
When trying to launch programs written/compiled with IDL under IDL Virtual Machine, my system is completely locking up at the point at which it says Loaded DLM: PNG.&160; This also occurs when trying to run the IDL Demo whenever anything is launched that uses the PNG DLM and I've noticed also the JPG DLM.
This was happening with IDL VM 6.3, but continues with IDL VM 7.0
This is a linux system, running Debian Etch.
Any advice, or points to the right direction would be appreciated!
...
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0 |
1538 |
05 Jan 2009 11:26 AM |
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1 Replies and 1210 Views
Programatic Change of Axis Color in iSurface 1210 1
Started by Deleted User
Hi all,
&160;
I know how to change the axis color (tick marks and line) in iSurface by double clicking and using the property table but is there any way to change it programatically There is a keyword for changing the axis text color, but I don't see one for the color of the axis line and tick marks.
&160;
Thanks,
&160;
--John
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1 |
1210 |
23 Dec 2008 03:46 PM |
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2 Replies and 1163 Views
How to write an array into a dateset as a band, not a dateset? 1163 2
Started by Deleted User
Hi, there
I want to write several 2-D arrays into a dateset as several ‘bands’, not several 'datesets' in a file.
I use HDF_SD_START&160; with keywords&160; /CREATE&160; to create a HDF file, and use HDF_SD_CREATE to create a dateset in the generated file. Now I have some (suppose 7) 2-D arrays that can be wrote into the file. What I want is to write these 7 array into the dateset as '7 bands in one dataset', not as 7 datesets in this file.
that is to say, if I use ENVI_FILE_QUERY&160; to...
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2 |
1163 |
15 Dec 2008 01:39 PM |
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0 Replies and 1329 Views
A question about CLASS_MAJORITY_DOIT 1329 0
Started by Deleted User
Hi, everybody.
I try to complete a project of Post Classification with CLASS_MAJORITY_DOIT, whose UI looks like Envi.
By reading the help, I can't find the tips or keywords how to pass the value of Center Pixel Weight.
Who can offer a solution &160; I&160; need your help!
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0 |
1329 |
14 Dec 2008 12:37 AM |
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0 Replies and 1375 Views
windows to linux portability 1375 0
Started by Deleted User
Hi,
I try to compile routines that have been implemented using windows XP. They work perfectly on windows but I get syntax errors when I try to compile them on linux.
Example of syntax error:
&160;var=function(arg1,arg2,arg3='String')
&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;...
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0 |
1375 |
12 Dec 2008 04:39 AM |
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0 Replies and 1134 Views
Working with ROI (region of interest) in IDL 1134 0
Started by Deleted User
Hi,
I have to do some works like this:&160; generate ROIs from one image, and then use these ROIs to another dataset. the image and the dataset have the different map projections, samples and lines.
Since routineslike&160; ENVI_GET_ROI_IDS and ENVI_GET_ROI_DATA need to use FID and NS,NL or POS as parameters, these routines do not works in this situation. So, any one can tell me how to achieve this in IDL
Thanks.
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0 |
1134 |
11 Dec 2008 08:54 AM |
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6 Replies and 1957 Views
Set map projection information to a dataset 1957 6
Started by Deleted User
Hi, there
I have got a 2-D array (eg. image&914000,4000&93 ), the data type is float, this array could be visuaized by ENVI / open image files, but there is no map information in "avaiblae bands list". So I want to set some kinds of map projection information to this dataset, for example Albers Conical Equal Area map projection,the central point would be N 20, W 35. which procedures in IDL should I use
Acturally, I search in IDL help, but I am totally confused by MAP_SET, MAP_IMAG...
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6 |
1957 |
09 Dec 2008 01:18 PM |
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1 Replies and 1251 Views
EOS_SW_ATTACH in a loop? 1251 1
Started by Deleted User
I have been trying to run a code (far too long to include here) which includes the line:
&160;&160;&160; swath_id&160;&160;&160; = EOS_SW_ATTACH( sw_id, swathname&91swath_ctr&93 )
&160;&160;&160; n_fields&160;&160;&160; = EOS_SW_INQDATAFIELDS( swath_id, field_list, rank, n_type )
I have been running a loop over the entire thing so that I can process all the files in my directory .&160; So far, every time i run the code after 30 runs of the loop, the code crashes because sw_id...
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1 |
1251 |
09 Dec 2008 06:23 AM |
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0 Replies and 1614 Views
widgets and inputting data by hand into a CW_FIELD or TEXT widget 1614 0
Started by Deleted User
Hi All
Aplogies in advance for my ignorance with idl widgets. I can't work out how to input say 6 different integers/float numbers by hand into 6 different respective TEXT WIDGETS or CW_FIELD WIDGETS and then after these numbers have been inserted actually use these values to do analysis in my IDL code ...... !
In effect this would be an interactive process whereby the user inputs&160; 6 different bits of data that are used by my code using widgets to input the data. I appreciate I am a novic...
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0 |
1614 |
04 Dec 2008 09:59 AM |
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0 Replies and 1582 Views
calculate solar zenith, solar azimuth, sensor zenith, sensor azimuth in MSG 1582 0
Started by Deleted User
I download some data of MSG-2 from eumetsat,
but there are no solar zenith, solar azimuth, sensor zenith, sensor azimuth in these data.
I don't know how to calculate these angles.
The position of MSG-2 is (0E,0N)
&160;
Thank you for everyone's reply
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0 |
1582 |
03 Dec 2008 09:06 PM |
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6 Replies and 1511 Views
ROI data extraction error, help,please 1511 6
Started by Deleted User
Hi,
I want to extract data from one ROI, and the data is in one daset of a file (MODIS). and I writes code like this:
///////////////////////// code below
PRO TEST1102,EVENT
NAMESTRING=DIALOG_PICKFILE(TITLE='PLEASE INPUT FILES',FILTER='*.HDF')
&160; &160; &160; &160; IF (N_ELEMENTS(NAMESTRING) EQ -1) THEN RETURN
ENVI_RESTORE_ROIS,'......\ data\ROITEST.ROI'
&160;&160;&160; &160;&160;&160; HDFID=HDF_SD_START(NAMESTRING)
&160;&160;&160; &160;&160;&160; INDEX=HD...
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6 |
1511 |
02 Dec 2008 08:10 PM |
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1 Replies and 1310 Views
multiband image negative values 1310 1
Started by Deleted User
Hi
I am a new IDL user and I am working with a multiband image. I would like to identify in each of the bands all pixels with a certain value, how can I do it
Thanks for your help
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1 |
1310 |
02 Dec 2008 11:34 AM |
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1 Replies and 1410 Views
how to deal with the missing value? 1410 1
Started by Deleted User
Hey everyong,
Now I want&160; to contour the Sea surface temperature, the value on land is 32767, how to deal with it
Thanks in advance.
&160;
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1 |
1410 |
30 Nov 2008 03:29 PM |
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1 Replies and 1160 Views
how can I read a file? 1160 1
Started by Deleted User
Hi,
I want to read one band dataset (included in a file) and assign the whole band dataset into an array.
how can I do it
Thanks
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1 |
1160 |
28 Nov 2008 07:04 PM |
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0 Replies and 1468 Views
cpu usage 1468 0
Started by Deleted User
I'm running IDL 7.0 on a&160; machine whidth fedora 9 (x86). I'm not able to use full cpu, every calculation i submit use few cpu clicle ( the windows version use full cpu) so de calculation is slow. Any idea
Thanks
Luca
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0 |
1468 |
28 Nov 2008 04:25 AM |
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3 Replies and 1233 Views
Automating ASTER Decorrelation Stretch 1233 3
Started by Deleted User
Hopefully someone out there has done something similar.&160; I am trying to read in a Level 1B ASTER file containing VNIR, SWIR and TIR data. I want to perform a decorrelation stretch on the TIR bands 10,11 and 12 in IDL (so that the process is automated) .&160;
I have been trying to use the ENVI Decor_doit function, but can't read the data into ENVI as I am unable to read in the Latitude and Longitude that are associated with TIR. (ENVI automatically reads in the first Lat and Long in the fi...
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3 |
1233 |
25 Nov 2008 12:50 PM |
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3 Replies and 2023 Views
how to calculate NDVI for tons of MODIS images using IDL 2023 3
Started by Deleted User
Hi guys,
I've been quite familiar with ENVI, were using it at school. I have recently discovered IDL and using some of the procedures I found on the net, i find it really good and useful. I know how to compute NDVI, EVI and LSWI using ENVI's band math but it would be really time consuming if im gonna compute the vegetation indices one by one for all images using band math.
I am still in the process of learning IDL and without a background in programming i find it really hard to write a procedu...
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3 |
2023 |
25 Nov 2008 01:17 AM |
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0 Replies and 1159 Views
How can I know the resolution? 1159 0
Started by Deleted User
I'm using NLDAS (North America Land Data Assimilation System) data which has 0.125 degree resolution with 464 X 224 grid boxes, and I'm trying to project this data to the Albers map projection using the code below. The LIMIT key used in the MAP_PROJ_IMAGE indicates the total area coverage of NLDAS. Using this code, the result returns with 464 X 224 grid boxes which are the exact same size as the original data input. How can I know the spatial resolution of the result. I believe the result should...
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0 |
1159 |
24 Nov 2008 10:04 AM |