Re: YAJL and very precise number

[Charles Wilt <charles.wilt@xxxxxxxxx>]

Are you sure you really need the 14 decimal places?


   - The *ninth decimal place* is worth up to 110 microns: we are getting
   into the range of microscopy. For almost any conceivable application with
   earth positions, this is overkill and will be more precise than the
   accuracy of any surveying device.
   - *Ten or more decimal places* indicates a computer or calculator was
   used and that no attention was paid to the fact that the extra decimals are
   useless. Be careful, because unless you are the one reading these numbers
   off the device, this can indicate low quality processing!


from:
https://gis.stackexchange.com/questions/8650/measuring-accuracy-of-latitude-and-longitude/

Charles

On Wed, Oct 19, 2022 at 7:14 AM Peter Colpaert <peter.colpaert@xxxxxxxxx>
wrote:

> Hi group,
>
> I've been tasked with refactoring some API calls from our system to various
> websites and am implementing Scott Klement's excellent YAJLR4 service
> program (thanks Scott!)
>
> However, I'm a bit at a loss as to how I can extract coordinates from a
> JSON file I receive.
>
> More specifically, the latitude and longitude are represented as follows:
>
>   "Location": {
>       "Lat_WGS84": 51.17456057389046,
>       "Lon_WGS84": 4.3991863572532086,
>       "X_Lambert72": 152128.06,
>       "Y_Lambert72": 207173.33
>      }
>
> I can successfully find the Lat_WGS84 and Lon_WGS84 nodes, but I cannot
> retrieve the full coordinates.
>
> If I use yajl_get_string, it returns nothing (of course), but
> yajl_get_number is truncated to 9 decimals whereas I need 14.
>
> I could of course treat the JSON response as a string and simply scan for
> the first occurrence of "Location", but that would defeat the purpose of
> having YAJL available.
>
> Any suggestions?
>
> Thanks in advance.
>
> Peter
>
> --
>
> Peter Colpaert
>
> Peter.Colpaert@xxxxxxxxx
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