Hi Hans, Roassal has support for loading OSM raw data and OSM tiles (map backgrounds) (WGS84 projection). See https://www.youtube.com/watch?v=6zoGIsQaGUo&t=429s. We've also experimented with animations as well: https://www.youtube.com/watch?v=sMB7DG-lbiU; we've also tried in the past to work out of GRASS-produced rasters for complex geographic analysis, such as runoff flooding, projected on osm tiles.
Regards, Thierry Le ven. 5 juin 2020 à 14:27, Baveco, Hans <hans.bav...@wur.nl> a écrit : > > Well, it appears that simple direct downloading does not download the real > shapefile. Taking care to actually get a shapefile, the result loads without > problems. > > ne_110m_populated_places.shp is a PointShape with 243 shapes (points). If you > display it on a Form (#displayMorphic) you won’t see much (243 hardly visible > dots). > > > > With an application for vector graphics (Roassal?) that can read & display > the vector data we would get much nicer maps... > > > > Hans > > > > From: Baveco, Hans <hans.bav...@wur.nl> > Sent: vrijdag 5 juni 2020 12:44 > To: Any question about pharo is welcome <pharo-users@lists.pharo.org> > Subject: [Pharo-users] shape file reading > > > > Hi Hernan > > > > I downloaded this shapefile directly via the browser. Indeed it won’t load, > the type of shape file returned is > > self longAt: 33 bigEndian: false -> 577660194 > > > > > > where it should have answered an Integer between 0 and 31 > > > > shapeType > > "position 32, Integer between 0 and 31, Little Endian" > > > > ^shpBytes longAt: 33 bigEndian: false > > > > > > No idea what could be the cause – apparently the header of the file (the > first 100 bytes) is not ok... > > > > Hans > > > > > > > > > > You mean some types are missing? Because I get this error when I try to read > some SHP files: "Types > 20 are not yet accounted for" > > > > I wrote this script to reproduce: > > > > | shpE legend urlRoot urlESRIFilePrefix urlESRIFileShp urlPath response > fileRef | > > " Download Shapefile resources " > urlRoot := > 'https://github.com/nvkelso/natural-earth-vector/blob/master/110m_cultural/'. > urlESRIFilePrefix := 'ne_110m_populated_places'. > urlESRIFileShp := urlESRIFilePrefix , '.shp'. > urlPath := urlRoot , urlESRIFilePrefix. > > #('.shx' '.dbf' '.shp') do: [ : ext | > | url | > url := (urlPath , ext , '?raw=true') asZnUrl. > (response := ZnEasy get: url) isSuccess > ifFalse: [ self error: 'Cannot download file' ]. > fileRef := FileSystem disk workingDirectory / (urlESRIFilePrefix , ext). > fileRef writeStreamDo: [ : stream | > stream nextPutAll: ((ZnByteEncoder newForEncoding: 'koi8r') decodeBytes: > response contents ) ] ]. > > > > Once downloaded: > > > > | urlESRIFilePrefix urlESRIFileShp shpE | > urlESRIFilePrefix := 'ne_110m_populated_places'. > urlESRIFileShp := urlESRIFilePrefix , '.shp'. > > " Load and display it in Morphic " > shpE := ShapeEnsemble fromFile: urlESRIFileShp. > > > > Maybe it's related with the fact they are encoded as koi8r? > > I checked with Zinc downloading first from the browser: > > > > | shpFile | > shpFile := 'ne_110m_admin_0_countries.shp' asFileReference. > [ shpFile binaryReadStreamDo: [ : in | > (ZnCharacterEncoder detectEncoding: in upToEnd) identifier ] ] > on: ZnCharacterEncodingError > do: [ nil ]. > > > > > > Cheers, > > > > Hernán > > > >
