Re: "not to convey (additional) information" No, it is useful information.
A human who knows the local area can pretty easily determine which blocks or streets are retail or industrial. This can be done even if you do not know the exact names of the buildings or businesses - sometimes in an industrial area, or a commercial area with offices, it might not be clear the exact names of each business, if certain areas are not open to the public. But you can often map the area just based on passing by on public streets, and then looking at aerial imaging. In a retail area, if every shop is mapped precisely then the landuse=retail tag could possibly be inferred, in the same way that Google maps "area of interest" - but looking at Google you can often see mistakes due to missing or miscategorized shops and homes. Adding the landuse provides a different level of information, which is not exactly the same as mapping each shop or office. Also, we do not map individual houses or apartments in any way other than as part of a larger landuse=retail area, and as buildings. While building=house can usually be inferred to be residential, this is not always, true, there are many houses that have been converted into offices for lawyers or dentists along busy streets, but these are still appropriately mapped as building=house in many cases. So landuse=residential is helpful to confirm that an area is predominantly covered by residences and their gardens or yards and other related features. While I would agree that urban landuse mapping is not the most important thing to add to Openstreetmap, it is still worth adding after buildings, streets, shops and other amenities have been added, just as it is useful to map the areas of farmland, farmyards, allotments, quarries and other areas, both to allow maps to be rendered and to allow landcover to be analyzed. In an area where all landcover has been mapped fairly accurately you can make some interesting analysis of the use of urban, rural and semi-natural lands. - Joseph Eisenberg On Tue, Oct 11, 2022 at 1:55 PM Evan Carroll <m...@evancarroll.com> wrote: > Thanks Joseph Eisenberg! That's exactly what I'm looking for. Good > answer. So basically the primary use case of an **unnamed** residential, > commercial, industrial, and retail "Zones" is not to convey (additional) > information but to serve as a good-enough styling solution about what the > zone conveys? As I suspected, it is solving a spatial clustering problem > manually to achieve a good-enough different visual style. I guess you can > see here in the landcover. > > > https://github.com/gravitystorm/openstreetmap-carto/blob/cae2309efd4ee0338fcdf9f201e92f20b338426c/style/landcover.mss#L16 > > The next question is can this be defined such that this can be automated? > It would seem to me like if we, > > 1. Take a bounding box. > 2. From that, subtract out the landuse polygons for named zones, LEAVING > ONLY "unnamed zones, and land not in a zone." > 3. From that, subtract out the landuse polygons for zones NOT of type > "common landuse key values - developed land", per the wiki > https://wiki.openstreetmap.org/wiki/Key:landuse LEAVING ONLY "unnamed > zones of developed land, and land not in a zone." > 4. Subtract out by key:highway lines LEAVING ONLY "unnamed zones of > developed land and land not in a zone that does NOT intersect a highway." > 5. Extract "unnamed zones of developed land and land not in a zone that > does NOT intersect a highway" into a zone set. > 6. Infer from the contents of the polygon what type of developed land the > zone is. > > This would allow us to be precise and objective and determine what kind of > "developed land" an unnamed zone was, as well as to provide a gauge of the > accuracy of the zone. > > If this was done, do you think this would satisfy all use cases of unnamed > landuse zones for developed land like commercial, retail, > residential, educational? > > (I said in the above "unnamed zone" for simplicity, and unnamed zone can > still have an operator, and in every case when I said unnamed zone, I meant > a zone without a name or an operator). > > -- > In the event this email pertains to Real Estate, Texas law > <https://texreg.sos.state.tx.us/public/readtac$ext.TacPage?sl=R&app=9&p_dir=&p_rloc=&p_tloc=&p_ploc=&pg=1&p_tac=&ti=22&pt=23&ch=531&rl=20> > requires all license holders provide to prospective clients the following > forms: Information About Brokerage Services > <http://docs.evancarroll.com/realestate/iabs.pdf>, Consumer Protection > Notice > <https://www.trec.texas.gov/sites/default/files/pdf-forms/CN%201-2.pdf>. > My TREC license number is 610570 > <https://www.trec.texas.gov/apps/license-holder-search/?detail_id=881377951> > and my sponsoring broker is NB Elite Realty LLC. > > -- > Evan Carroll - m...@evancarroll.com > System Lord of the Internets > web: http://www.evancarroll.com > ph: 281.901.0011 <+1-281-901-0011> > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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