I'm a beginner with QGIS. Anyone know how to get contours as a vector in an SVG or DXF file? I've seen many videos that start halfway through the process. I need one that starts at generating the initial map. Thanks
Hello Hans, Thanks a lot for such a tutorial. Many of your tutorials help me a lot. Much appreciated. I have a general question to you related to bathymetry. When a bathymetry contour line shows for example 40m, what does it mean? 1. Is that the height from the datum to the seabed? 2. or is it the height from the seabed to the water surface? Thank you for clarifying my confusion :)
It probably depends on the data that you use, what is used as a reference for the elevation. In all cases bathymetry is the level of the seabed and not the water level. But the mean sea level could be used as a reference, or datum.
This was created by interpolating borehole groundwater levels using the IDW algorithm. So if you have borehole data, you can do this with the IDW tool in QGIS.
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Incredible video! Great explanation, finally found one! Thank you Hans!
excellent video
I'm a beginner with QGIS. Anyone know how to get contours as a vector in an SVG or DXF file? I've seen many videos that start halfway through the process. I need one that starts at generating the initial map. Thanks
Hello Hans, Thanks a lot for such a tutorial. Many of your tutorials help me a lot. Much appreciated. I have a general question to you related to bathymetry. When a bathymetry contour line shows for example 40m, what does it mean?
1. Is that the height from the datum to the seabed?
2. or is it the height from the seabed to the water surface?
Thank you for clarifying my confusion :)
It probably depends on the data that you use, what is used as a reference for the elevation. In all cases bathymetry is the level of the seabed and not the water level. But the mean sea level could be used as a reference, or datum.
@@HansvanderKwast Thank you so much for your clarification.
Hi, sir how to download, GWL_IDW band,
This was created by interpolating borehole groundwater levels using the IDW algorithm. So if you have borehole data, you can do this with the IDW tool in QGIS.
@@HansvanderKwast Ok Sir. Actually m beginners. Make a Geo-graphical Co-ordinate of relevant locations where flood levels are intended for