Thank you very much. The relief was made with a GNSS receiver (not from me). The people that made it are working for a society that handle municipal waste water and sewers. They use the GNSS as a "tape meter" (with full respect for the employees that must follow the orders from the boss even if they are not qualified).
I will try to make the same thing with my GNSS to see what QGIS will say to me. I would like to understand. I'll let you know. Thank you again, Manolo On Thu, Jun 29, 2023 at 3:35 PM Greg Troxel <[email protected]> wrote: > Manolo Terranova <[email protected]> writes: > > > EPSG 32632 > > The zip had a shapefile tagged as 32632, with (per ogrinfo): > > Name: String (16.0) > Code: String (60.0) > Northing: Real (18.5) > Easting: Real (18.5) > Elevation: Real (18.5) > OGRFeature(Ponti):0 > Name (String) = cs004 > Code (String) = pn > Northing (Real) = 5030233.30810 > Easting (Real) = 631584.78631 > Elevation (Real) = 103.18448 > POINT ZM (631584.786313961 5030233.30810281 147.350793083198 > 1371918614) > > OGRFeature(Ponti):1 > Name (String) = cs005 > Code (String) = pn > Northing (Real) = 5030233.28520 > Easting (Real) = 631584.74959 > Elevation (Real) = 103.17660 > POINT ZM (631584.749590836 5030233.28520391 147.342911031097 > 1371918631) > > OGRFeature(Ponti):2 > Name (String) = cs006 > Code (String) = pn > Northing (Real) = 5030235.54719 > Easting (Real) = 631549.52750 > Elevation (Real) = 103.27301 > POINT ZM (631549.527499332 5030235.54718945 147.438223647885 > 1371918715) > > The first two points are perhaps the same place, and the third is ~35m > away. The M value is unlabeled, but obviously timeval, 22 June 2013 1630 > UTC > ish. > > That is a 2D CRS: WGS 84 / UTM zone 33N. It has no altitude. So having > a Z value does not make sense, but that may be because "POINT M" is not a > thing, at least in Postgis: > https://postgis.net/docs/ST_MakePoint.html > > So: > > How did you obtain this data? > > Was it autonomous GPS? SBAS differential? RTK? PPP? > > What is the basis of your belief that the data is in 32632? > > [ Standard rant: It is just about inconceivable that you could have > made measurements in the WGS84 ensemble, but perhaps you did RTK and > that reference station only has ensemble coordinates :-) ] > > Where did the Z values come from? > > Why did you store the data in a 2D CRS if it is 3D data? Or if it is > not 3D data, why isn't the Z field consistently 0 or some other undef > codepoint? > > Where did the easting/northing/elevation values come from? The > easting/northing look copied from the POINT values. > > What do you think the altitude of the points ought to be, in the datum > used as HAE, as WGS84 Orthometric Height, or some other orthometric > height datum? > > Overall, the basic issue is your data, not anything about qgis. You > need to understand that measurement pathway and be able to answer the > "why/how" and "I'm skeptical; show me the evidence" questions. If > someone gave you the data file without explaining that, ask them the > above questions. Feel free to tell them the Internet said to be > difficult! > > > >
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