- From: Raphaël Troncy <raphael.troncy@eurecom.fr>
- Date: Thu, 18 Feb 2016 19:22:23 +0100
- To: Ed Parsons <eparsons@google.com>, George Percivall <gpercivall@opengeospatial.org>
- Cc: Jon Blower <j.d.blower@reading.ac.uk>, Frans Knibbe <frans.knibbe@geodan.nl>, SDW WG <public-sdw-wg@w3.org>, Chris Little <chris.little@metoffice.gov.uk>, Jeremy Tandy <jeremy.tandy@gmail.com>
Dear Ed, all, > I do accept there are exceptions... what is your estimate of the % of > spatial data on the web that is not CRS84 ? This is a tricky question to answer in general, but I second the opinion that states that there is a LOT of spatial data on the web which is not CRS84, and in particular, authoritative data. Let's take an example, the official French Open Data Portal https://www.data.gouv.fr/fr/datasets/ ... there are thousands of datasets, coming from both the public administration and the private sectors. Most of the data is geo-localized ... and rarely the CRS used is WGS84. For example, pick the dataset that describes ALL (primary/secondary) schools in France [1] and try to plot the schools on a map by interpreting that the coordinates are in WGS84 ... you will find many schools in the ocean. In this dataset, you have to interpret the geo coordinates of the schools in France Metropolitan in RGF93, the ones in Guadeloupe/Martinique in CRS84, the ones in Guyanne in RGFG95, the ones in Réunion in RGR92, etc. This is not an exception ... this is the rule! All official data from the French public administration will come in RGF93 (Lambert93). Many European countries have similar rules. This does definitively not cover 1% of the spatial data on the web Raphaël [1] https://www.data.gouv.fr/fr/datasets/adresse-et-geolocalisation-des-etablissements-denseignement-du-premier-et-second-degres/ -- Raphaël Troncy EURECOM, Campus SophiaTech Data Science Department 450 route des Chappes, 06410 Biot, France. e-mail: raphael.troncy@eurecom.fr & raphael.troncy@gmail.com Tel: +33 (0)4 - 9300 8242 Fax: +33 (0)4 - 9000 8200 Web: http://www.eurecom.fr/~troncy/
Received on Thursday, 18 February 2016 18:22:55 UTC