Hi everyone, We sent a message to imports list a few months ago when we finished the first version of Cat2Osm. This is the results of almost two years of work back-to-back with the spanish OSM community. It is a tool for converting a whole municipality's spanish cadastre data [1], to an OSM file for then checking manually some small errors cadastre could have, fix them and import the necessary data into OSM. Please notice that this is not meant to be a tool to mass import, in fact it is a tool to help local mappers to improve existing data or having a good starting point in empty places. We repeat, this is not an automatically import tool!!
The first version exported too much data and created lots of relations so we've been working with spanish OSM community on a second version of Cat2Osm2 [2], that simplifies the result by losing some extra info like: - reducing the number of relations. - not taking in account building levels - create the union for all rural areas which share the same tags - pass building tags to parcels and remove the building when their geometries are the same It also exports the result divided in urban/rural blocks which makes it very easy for users to validate everything is ok, remove unnecessary geometries and merge it with existing data. We also export in separate files linear or points elements that can be also interesting to import. What the spanish OSM community mainly wants to use from the result is urban related data such as: buildings or parcel landuses and rural landuses. However, Cat2Osm2 also exports street geometries that could be suitable for checking if the existing street data is correct or have a good start point. In fact the import list have already allowed the use of this kind of data. Here's a link with the result for a village called AldeasecaDeAlba in Spain [3]. If you look for Aldeaseca de Alba in OSM [4] you will see it almost has no data (only street without names). Cat2Osm2 exports the files separately as we previously said but it also concatenates them into a global big file just in case someone wants to use the result for his own GIS or for a quick review of the result. You will find all this files in previous link. Please note that the concatenated files is only intended for debug actions and the actual import process will be made with the split files inside the directories. Once they've exported the result, at least two users have to review each block before upload. We have already some wiki infrastructure to coordinate this actions [6] but probably it would be better to have a more productive one. There exists a import guide [7] with the general information in English and a user guide [5] with tips that will be updated when local mappers gain more experience working with this data. Please notice that this work-flow will change as it is based on the use of the last version on an specific city and cannot be suitable for other places. We have already created imports accounts (one per province) [6] and distributed to some expert users that would be in charge of the upload process. We will be very strict with the process; we will not allow to upload data with other accounts and if somebody does not respect the rules we will ask the admins to take the appropriate action against them as we have already done on several occasion. We hope you find this results suitable for being uploaded in those places where some data is needed. [1] http://www.sedecatastro.gob.es/ [2] http://wiki.openstreetmap.org/wiki/Cat2Osm2 [3] http://paginaspersonales.deusto.es/cruz.borges/AldeasecaDeAlba.zip [4] http://www.openstreetmap.org/?lat=40.81818&lon=-5.44678&zoom=17&layers=M [5] http://wiki.openstreetmap.org/wiki/Minitutorial_para_cat2osm_Avila [6] http://wiki.openstreetmap.org/wiki/Spanish_Cadastre/results [7] http://wiki.openstreetmap.org/wiki/Spanish_Cadastre_import -- Cruz Enrique Borges Hernández Email: [email protected] DeustoTech Energy Telefono: 944139000 ext.2052 Avda. Universidades, 24 48007 Bilbao, Spain _______________________________________________ Talk-es mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-es
