I have a very important Question. I have a GRD file which can be opened in SURFER or QGIS or GIS.

The problem is that how can I customize and make my grid file perfect?

Here I have two photos which will explain my issue correctly:

GRD file edited using **SURFER** this file is the one I'm expecting to create but it's been made using Surfer program. I want to make it this much perfect with QGIS but it only gives me the result below after putting too much time on it: GRD file edited using **QGIS**

if there's a better way to do this please explain it with details. QGIS has so many options and I'm not completely familiar with them.

I have created contours from My raster data, then polygonized and categorized them using Graduated type.

the results are shown below:


As you can see the map has become full of square pixels. I need to have it just like Surfer SMOOTHLY as were shown.


  • Try creating contours from your raster data, then polygonizing and categorizing them – csk Jan 2 '19 at 17:18
  • @csk I have done it. everything is OK but the map is in pixel form. how can I make the boundaries more smooth? – Nima Dolatabadi Jan 2 '19 at 19:18
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    It's not clear what you're doing. If you created contours as I suggested, there wouldn't be "pixels." If you're doing something else, please edit your question and explain what you've tried so far. Without knowing that, we can only make random guesses about how to help. – csk Jan 2 '19 at 19:25
  • @csk I have add the result at the end of the question. thank you for your help. – Nima Dolatabadi Jan 2 '19 at 19:37
  • Rasters are not my area of expertise; I've made all the suggestions I can. There's a whole community on this site, so be patient and hopefully someone with more familiarity with rasters will be able to help you. – csk Jan 3 '19 at 14:56

What are you actually trying to accomplish in QGIS? Maybe this can be done in Surfer? For example, if you're trying to create a gradient map (a map showing slope or gradient values), use the Grid Calculus command in Surfer (Grids | Calculate | Calculus) with the Gradient Operator to create a new grid file of the slopes (rise/run). Then you can create the map in Surfer (either contour or color relief, etc).

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  • I'm full aware of surfer and I can manage to plot the map perfectly. But I'm just curious that can I plot the gradient map as perfect as surfer? – Nima Dolatabadi Jan 9 '19 at 7:33

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