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enter image description hereI have a global ocean temperature point data downloaded from NOAA.

I want to clip and isolate data just for Southeast Asia in the form of a rectangle.

I would also want to do this to other parameters such as salinity, phosphate, etc, so I would need to know the boundaries to be used for clipping the other parameters.

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Use the Vector-> Research Tools -> Select By Location

enter image description here

The Parameters are:

  • Select Features in: "Your point file"
  • That intersect Features in: "YOUR RECTANGLE"

Then once that selection is made Save the new selection as a shapefile by right clicking the point file in the table of contents -> Save As:

enter image description here

Make sure to check the Save Only Selected, this will make a new shapefile from the Selected points within the rectangle.

For the other parameters you can use the Select By Expression here is a turorial: Here as opposed to SELECT BY LOCATION

You can use PyQGIS to automate the process

  • Note I just saw you are using QGIS let me edit! – user32496 Nov 23 '16 at 23:02
  • Thanks a lot. How long should this go? It seems mine is taking too long. I've been runnning it for more than 5mins already. – John Nov 28 '16 at 8:34
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What you are looking for is a geoprocessing tool called Clip. You can find in QGIS in Vector > Geoprocessing Tools > Clip.

The detailed description for geoprocessing tools can be found here: http://grindgis.com/software/qgis/basic-editing-tools-in-qgis.

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