Hi Stef
El jue., 4 jun. 2020 a las 11:21, Stéphane Ducasse (< stephane.duca...@inria.fr>) escribió: > It would be good to have the related package under an umbrella. > For example I can spend some time packaging hans package on github but > only if it helps. > I already migrated to Pharo and published in Github https://github.com/hernanmd/Shapes so you may use that one if you like Cheers, Hernán > So let me know. > > S > > On 4 Jun 2020, at 14:15, Serge Stinckwich <serge.stinckw...@gmail.com> > wrote: > > OpenGIS is an object-oriented meta-model for GIS. There is no > implementation in Pharo but can give a good blueprint if we want to do > something like that. > > I’m GMT+8. So a meeting Thursday at 9am for you is great for me (2pm for > me). > It would be nice if Hernan can join also, but might be difficult with the > time zone difference. > > Regards, > > Sent from my iPad > > On 4 Jun 2020, at 18:50, Norbert Hartl <norb...@hartl.name> wrote: > > > > Am 04.06.2020 um 12:31 schrieb Serge Stinckwich < > serge.stinckw...@gmail.com>: > > > > On Thu, Jun 4, 2020 at 4:11 PM Norbert Hartl <norb...@hartl.name> wrote: > >> I started this initiative for our company because we are in the mobility >> bubsiness where maps and geo centric things are important. It is not >> elaborate as a real GIS support but a start. So here my secret plan: >> >> > Thank you Norbert for your interest on that topic. > I put Etienne Delay because he is not ont the pharo-users mailing-list and > I'm working with him on GIS issues for CORMAS. > > - GeoJSON [1] was done because web services came up with that format to >> exchange geo shape information. Furthermore database like MongoDB changed >> their internal support for 2d/2dsphere indexes also to GeoJSON. There is a >> package GeoJSON-Voyage which is start of a helper to easily store Geo data >> in voyage-mongo. >> >> - I started to do a KML Reader [2] because besides GeoJSON that is a >> widely used format. And this can be used in Google Earth which is the best >> free Geo editor that I know. >> >> - As KML and GeoJSON use a similar model for representing geo shapes and >> POIs I started to factor out that into the Geography package [3]. >> >> - At the moment in the Geography package there is only a 2D point class >> GGPoint to have something to hold geo coordinates (there is also a 3D >> variant). In the past I used Point as the class for these things but came >> to the conclusion that there is a distinction between a point and geo point >> when it comes to things like distance etc. So it is better to have them >> separate. Into this model I want to morph the classes for LineStrings, >> LinearRings, Polygons etc. from GeoJSON and KML to have a common foundation >> for the basic geo shapes lines, multi-lines, closed multi-lines (=polygons) >> etc. >> >> - As GGPoint is distinct to Point this is just the context where you use >> it. The Geography package should be a companion to the Geometry package [4] >> which I forked from TelescopeSt to make it a community package which is >> good for this plan but also for roassal which uses the Geometry package. To >> me the geoX model should be switched between Geometry and Geography >> regarding to the context you want to work in being planar or spherical. >> >> - In my tools that I build this model classes have also gt-inspector >> extension so the shapes can be viewed just by inspecting them. I'm fighting >> with the roassal team to make it possible for geo coordinates which >> conflicts at the moment with their defined thresholds. But with the >> factoring the shapes into Geography I will move those extension to the >> Geography package as well >> >> - I also implemented a polygon intersection algorithm (Weiler and >> Atherton) which I will then incorporate in any of the GeoX packages >> >> > You have done a lot of work. And we add all the work done by Hernan on > supporting ESRI shapefiles, we have already a good start. > > Etienne also mention the OpenGIS model in this issue: > https://github.com/cormas/cormas/issues/139 > > From what I understood, OpenGIS model crosscut many points of the > Geography package: > http://portal.opengeospatial.org/files/?artifact_id=25355 > > So these are the pieces that are there. The plan in text is: >> >> - Have a incarnation of a "point" and make that switch context from >> planar to spherical >> - Use planar treatment with the Geometry package (intersections etc.) >> - Use this "point" to generate shapes either geometric or geographic >> - Be able to read and write in common formats like GeoJSON and KML >> - Make shapes be composable and inspectable with the existing tools >> >> I think GIS needs more but what we have is more than just a start. The >> projection system with the current code is WGS84 for sure. If there are >> other needs we need to think about this early. >> >> For everything else I'm open ears. Even for the idea of having a >> pharo-gis github project to collect those things to a common place. But I >> like to discuss GIS and not if it makes sense to have a all of these github >> repos. >> > > We can try to do an online meeting to discuss about that with Etienne and > other people interested by this topic. > We are mostly interested to have GIS support on CORMAS, so having a common > repository will definitively help us. > At the moment we are using Roassal2 for CORMAS visualisatin and we are > moving towards Roassal3. > > > Good idea! I just created the Geography package because I felt the need > for it. But if there is something better I would like to use this instead. > I'm generally available the best at wednesdays and thursdays. Next week is > already stuffed but if you propose some DateAndTimes I'm sure we find a > match. Which timezone are you in at the moment? > > Norbert > > Regards, > -- > Serge Stinckwic > h > https://twitter.com/SergeStinckwich > > > > -------------------------------------------- > Stéphane Ducasse > http://stephane.ducasse.free.fr / http://www.pharo.org > 03 59 35 87 52 > Assistant: Aurore Dalle > FAX 03 59 57 78 50 > TEL 03 59 35 86 16 > S. Ducasse - Inria > 40, avenue Halley, > Parc Scientifique de la Haute Borne, Bât.A, Park Plaza > Villeneuve d'Ascq 59650 > France > >
