Clipping interpolated raster with shape of original point data-set

Question

I have a point dataset with XYZ values.

I inserted this layer in QGIS 3.6 via layer > add layer > add delimited layer.

Then, I interpolated these points to a raster via interpolation > TIN interpolation.

However, now the data are interpolated over the whole domain, even in areas where no data are present in the original file. How can I clip out the interpolated raster with the original shape of the point dataset?

The xyz file can be downloaded from:

https://wetransfer.com/downloads/4ae4ce51072dceef93486314d161509920191021213532/48e4ee68c17269bd6f7a72c1384b3c9a20191021213532/60b04d

Interpolated raster:

Interpolated raster with original point dataset on top:

Points to Polygon then apply Inverted polygons to it further put over the raster — Taras, Oct 22 '19 at 11:37
@Taras. Hi thanks. Where is the points to polygon tool? Does it need to be downloaded somewhere? — user152287, Oct 22 '19 at 11:47
I think there are several possibilities to accomplish this, by means of a plugin Point to Polygon, as well check this article Converting point sets to polygon boundaries?. — Taras, Oct 22 '19 at 17:21
I think it also possible with a different approach: what if you find a shapefile of Antarctica in exactly the same shape and just overlap it afterwards? — Taras, Oct 22 '19 at 18:56

score 0 · Answer 1 · answered Aug 08 '23 at 07:39

I had a similar problem and this is how I got a polygon shape file from the original point dataset:

Vector > Geoprocessing tools > Buffer: set a buffer value so that the polygons will cover the whole area.
Vector Geoprocessing tools > Dissolve: so that all the individual polygons become a single one.
Optional: Vector > Greoprocessing tools > Buffer: to add a negative buffer so that the final polygon's boundaries as as close to the original points as possible.

Clipping interpolated raster with shape of original point data-set

1 Answers1