| converting map projections using ENVI [message #50106] |
Wed, 13 September 2006 12:57  |
surajchem
Messages: 10
Registered: September 2006
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Junior Member |
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i have a simusoidal map which i want to convert into lambert conformal
conic projection.
i made a customize lambert conformal conic projection. but when ever i
tried to convert it it would give the following error" array dimensions
must exceed 0"
but when i tried to convert a world demo inbuilt in ENVI and using the
customized projection it worked!!
i dont know where i am going wrong
any help would be appreciated
thanks
sunny
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| Re: converting map projections using ENVI [message #50216 is a reply to message #50158] |
Mon, 18 September 2006 08:46  |
surajchem
Messages: 10
Registered: September 2006
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Junior Member |
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i had a earth data that is a IS projection with 4 km resolution which
i downloaded from the site which had this header of the file
*****************************************************
ENVI
description = {
File Imported into ENVI.}
samples = 10800
lines = 5400
bands = 1
header offset = 0
file type = ENVI Standard
data type = 1
interleave = bsq
sensor type = Unknown
byte order = 0
map info = {Sample IS, 5400.5000, 2700.5000, 0.0000, 0.0000,
3.7065017090e+003, 3.7065017090e+003, , units=Meters}
projection info = {38, 6371007.2, 0.000000, 0.0, 0.0, 86400, 1, Sample
IS, units=Meters}
wavelength units = Unknown
geo points = {
1.0000, 2700.0000, 0.00000000, -180.00000000,
5400.0000, 300.0000, 80.00000000, 0.00000000,
10500.0000, 2700.0000, 0.00000000, 170.00000000,
5400.0000, 3600.0000, -30.00000000, 0.00000000}
pixel size = {3.70650171e+003, 3.70650171e+003, units=Meters}
************************************************************ *******************************
after editing the header in the ENVI with the above data i could view
the map .
then i went on to create a customized map projection which comes under
'map' in the envi tool bar.
customized lambert conformal conic projection (which shows china in
front)
with 0 E, 0 N , cental meridian: 110 E, latitude of projection origin :
0 N
and the two std parallels 25 N and 40 N.
after which i would select maps>> convert map projections>>
i would select the projection and it would make automatic changes to
the input/ output pixels size, then i would select 'rigorus' in the
'conversion parameter' and then choose nearest neighbor and then press
OK.
then it would give the error ' matrix dimension must exceed zero'
but then i tried using the inbuilt Lambert CC in ENVI still gave me the
same error
but when i used Geographic Lat/Long as map projection it worked i again
tired to use envi to convert from this projection into LCC , gave me
the same error.
so then i tried a demo geo lat/lon world map inbuilt in ENVI and tried
to use my customised LCC and the inbuilt LCC and it worked for both
so now i am stuck!!!!!
do u use envi?
> surajchem@hotmail.com wrote:
>> I did not write any code i just use ENVI software to do the conversion,
>> i had obtain the data from any ftp site where they mention about using
>> ENVI software to use it.
>
> Sorry - I read your message too quickly, and didn't notice that it was
> ENVI, rather than code that you wrote, which produced this message.
> Without knowing which line of code is failing, it's going to be
> difficult to figure out which array has the wrong dimensions.
>
> At the very least, could you provide an explanation of the exact steps
> you took, including the values of all relevant projection parameters
> that you set?
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