Re: not sure which txt example to read a grided data set

The mixture of text, integers and floats makes this
an 'unfriendly' file format. Further, the lack of delimiters
(eg, 99999999999...) inhibits generic automatic reading.
Hence, a custom 'brute force' code must be developed.

Attached

On 10/29/11 4:50 PM, Dave Allured wrote:
> No example fits well. I would start by reading the whole file into
> a simple string array, as seen in the example "string1.txt". Omit
> the header lines with range subscripting, and delete a single
> leading blank from each line with str_get_cols.
>
> The tricky part is to reshape each group of 12 lines into one long
> string for each latitude and 288 longitudes. I would use a single
> do loop over latitudes. Then, for each block of 12 input lines, use
> str_join with null string delimiter, or perhaps the + operator, to
> make a single long string.
>
> Then use str_split_by_length to break into strings of length 3.
> Then use range subscripting to get only the first 288 substrings,
> and discard the rest which contain the text label on the right side
> of the 12th line. Convert the 288 substrings to integers with
> string_to_integer. Store the 288 integers into your output array,
> one row at a time. HTH.
>
> --Dave
>
> On 10/28/2011 10:39 PM, Rashed Mahmood wrote:
>> Dear NCL folks
>> I want to read in NCL one data set (monthly mean Aerosol Index from
>> TOMS) which is in a txt file with 1.25/1 degree lon/lat spatial
>> resolution.
>> I know there are many txt file reading examples however, when
>> I compare this data file with the examples I am uncertain which
>> example would read the data set. The data file is attached herewith.
>> Can anyone guide me please.
>> Thanks alot
>> Rashed
>>
>> L3_aiavg_n7t_197901.txt
>>
>>
>> Month: January 1979 Archive v8 N7 TOMS AEROSOL INDEX
>> Longitudes: 288 bins centered on 179.375 W to 179.375 E (1.25 degree steps)
>> Latitudes : 180 bins centered on 89.5 S to 89.5 N (1.00 degree steps)
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999999999999999999999999999999999999999
>> 999999999999999999999999999999999999999 lat = -89.5
>> 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 0
>> 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1
>> 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0
>> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>> 0 0 0 0 0 0 0 0 0 0 0 0 0 lat = -88.5
>> 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
>> 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0
>> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>
> <snip>
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