Denis Oct 9 8:58 PM
On 09/10/2012 3:27 PM, Denis wrote:
> Thanks Bill,
>
> I have these codes. I translated the ucac3 to Delphi and its works very
> well.
>
> One thing I have done is written a little program which take the present
> A2 files and filters them by mag, ie. 16 to 20 mag data only.
>
> I used to have an A20.index in text mode not bin but somehow can't find
> it anymore. I notice that when you delete the A20.idx in Guide 9 it
> re-creates itself. What I would like to do is use my A2 set of files in
> Guide 9 but need to replace the A20.idx to match my new files.
>
> I vaguely remember how to produce one but it would easier and quicker if
> I had the codes. Thinking clearly, I could simply extract the data in a
> text file which is quite easy to do.
>
>
> Denis
>
>
>
> On 09/10/2012 9:46 AM, Bill J Gray wrote:
>> Hi Denis,
>>
>>> Are you planning to take the UCAC4 permanently into Guide 9? With all
>>> the improvements, it would be worth to create the a new Guide 9 set of
>>> files as you did for UCAC3. The best way would be to create codes to
>>> convert UCAC4 to Guide 9 format and use the resulting files to replace
>>> the UCAC3 360 files.
>>
>> I expect to do that at some point. First step has been to get Guide
>> to show UCAC4 from the original disks. This serves several purposes,
>> one of which is that anybody (including Guide 8 users) can get UCAC4
>> displaying as soon as they have the UCAC4 disks.
>>
>> Another advantage: in order to get UCAC3 to fit on the Guide 9 DVD,
>> I had to compress it, and the compression was not lossless. I reduced
>> the precision (usually to a point well within the error levels of the data)
>> and threw out some internal flags and similar "less important" data.
>> I'll have to do the same sort of things with UCAC4. If you run from the
>> raw data, you get absolutely everything. (If you look at "more info"
>> for UCAC4, you'll see that there is quite a lot of data: three infrared
>> magnitudes from 2MASS, two magnitudes from UCAC4 itself, and -- for a
>> lot of brighter stars -- five APASS magnitudes. Be warned that these last
>> are not to be trusted to the degree their errors indicate, though.)
>>
>>> If I had the codes I would give it a try. Are the codes to access the
>>> reformatted ucac3 in guide 9 available?
>>
>> I haven't gotten those posted yet (I have a _lot_ of code that needs
>> to be posted... it also needs to be commented and cleaned up to the point
>> where it won't drive anyone too crazy). I _do_ have C code posted for
>> accessing the raw UCAC4, 3, and 2 data, at
>>
>> http://www.projectpluto.com/ucac4.htm
>> http://www.projectpluto.com/ucac3.htm
>> http://www.projectpluto.com/ucac2.htm
>>
>> This code should be quite readable and, I hope, useful to any C or
>> C++ programmers out there.
>>
>> -- Bill
>>
>>
>>
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