Chris, Thanks for helping me out. Your detailed explanation was really helpful. I could not have done without it, thanks for taking so much time.
A short memo about what I did is in my answer to Nicolas Cadieux. Best, Maria > Am 13.05.2020 um 01:36 schrieb chris hermansen <clherman...@gmail.com>: > > Maria and list, > > On Tue, May 12, 2020 at 4:24 AM Priv.-Doz. Dr. Maria Shinoto > <maria.shin...@zaw.uni-heidelberg.de> wrote: > Hi, > > I am having problems to set up the parameters for Raster > Convert > > Rasterize Vector to Raster > > My basic map is JGD2011 / Japan Plnae Rectangular CS II, and I downloaded an > xml file JPGIS/GML format, that had to be converted to shapefile in a special > application. > > So according to this https://epsg.io/30162 that projection is: > Coordinate system: Cartesian 2D CS. Axes: northing, easting (X,Y). > Orientations: north, east. UoM: m. > > > > > Now I have the points as a grid with approximately 5m distance and want to > convert them to Raster, since this is what I want to use as DEM for analyses. > > Everything works, but the pixel are extremely largen, not 5m. > > I set the units to pixel, and since it is 5m mesh (from 0.2 seconds), I was > told to use 0.000056 for horizontal and vertical resolution, but I do not > know what I am doing there, and I do not find any similar application in > tutorials, handbooks and books, the options in QGIS documentation do not > really help. > > This sounds completely incorrect to me. I believe you should specifically > set the following on your Rasterize (Vector to Raster) dialogue: > > Output raster size units: Georeferenced units > > Width/Horizontal resolution: 5.0 > > Height/Vertical resolution: 5.0 > > Output extent -> use canvas extent > > > Can anybody guide me to the correct value? Or to another flaw in my thinking? > > > Since your input point data is in a cartesian (ie x-y) projection and in > metres (apparently with Tokyo as its zero point), and since you want your > output raster in metres in the same reference system, there is no need to be > thinking about how many seconds correspond to metres at your latitude, nor > pixels, nor anything like that. > > If you refer to the link above describing the Japan Plane Regular CS II > projection, you will see it is based on the Bessel 1841 spheroid. It may be > useful for you to set your project properties before doing the vector to > raster conversion. > > Select Project > Properties > CRS, then use the filter to find Tokyo / Japan > Plane Rectangular CS II EPSG:30162 Select that coordinate reference system > and click Apply. The menu should look like this: > > <Screenshot from 2020-05-12 09-33-29.png> > > > -- > Chris Hermansen · clhermansen "at" gmail "dot" com > > C'est ma façon de parler. _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
