Hi all,

I experience geospatial datetype decision problem. We use for a while geo:lat and geo:long as xsd:decimal as I was not able to find correct datatype and xsd:decimal seemed quite solid. Now I see in Sesame that they use xsd:double ( https://openrdf.atlassian.net/browse/SES-1808 ). Then I looked into FactForge, did some random query which returns latitude and longitude and export some lines into JSON. There I see that some are float, some are double and some dont even have a type :

    "latBase": { "type": "typed-literal", "datatype": "http:\/\/www.w3.org\/2001\/XMLSchema#double", "value": "51.5084152563931" }, 
    "longBase": { "type": "literal", "value": "-0.12883186340332" }
    "latBase": { "type": "literal", "value": "51.5005149421307" }, 
    "longBase": { "type": "literal", "value": "-0.12883186340332" }
"latBase": { "type": "typed-literal", "datatype": "http:\/\/www.w3.org\/2001\/XMLSchema#double", "value": "51.5084152563931" }, 
"longBase": { "type": "typed-literal", "datatype": "http:\/\/www.w3.org\/2001\/XMLSchema#float", "value": "-51.128055555555555" }

My next stop was Google recommendation and for MySQL they recommend float. We want to have standard implementation as I see that in future releases you plan to be in sync with some geo standard and we don't want to risk that all geospatial function (omgeo:nearby, omgeo:within...) will stop to work. What is your advice?

Thank you for your answer.

Best regards,


asked 22 Apr '13, 08:56

Marek%20%C5%A0urek's gravatar image

Marek Šurek
accept rate: 0%

OWLIM is quite flexible. It just required that the lat/long literals are numeric. I think you will be quite safe typing them to xsd:float or xsd:double if you need the extra precision.


answered 23 Apr '13, 17:10

baz's gravatar image

baz ♦♦
accept rate: 36%

So no exact standard for lat, long representation right?

(24 Apr '13, 04:33) Marek Šurek

Not in OWLIM and I'm not aware of a standard for this anywhere else. I had a look through http://www.opengeospatial.org/standards/geosparql but I didn't find anything.

(29 Apr '13, 07:34) baz ♦♦
Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here



Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported



Asked: 22 Apr '13, 08:56

Seen: 4,253 times

Last updated: 01 Jun, 04:22

powered by BitNami OSQA