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Business Intelligence,Software & Programme

Further Editing Background Images with Quantum GIS for use in Tableau

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Quantum GIS

In the last part we used a plan to plot coordinates on using Quantum GIS. Let’s continue using the same map but using shapes this time to accelerate the process and to give more accurate points.

1. Open the image in QGIS as a Raster Layer.
2. Add a new Shapefile Layer as shown. Choose Polygon as Type. Give name to file.
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3. Toggle editing.
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4. Select add Feature.
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5. Draw the required shape
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6. Click Select Single Feature
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7.Select your rectangle, CTRL+C then CTRL+V to copy and paste shape.

8. Select Move Feature.
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9. Click and drag the pasted shape from over the original shape.
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10. Repeat procedure to get a block of 4.
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11. You can now copy the whole block of 4 and paste the whole unit where required on the image.
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12. Go to Vector > Geometry Tools > Polygon Centroids. Choose file and select add results to canvas.

13. The single points represented by the Polygon Centroid layer represent the center point of our shapes. Exactly what we need in Tableau.
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14. Now right click on the Polygon Centroids layer and select Open Attribute Table. The follow steps 8 and 9 from the previous post ‘Creating Background Image maps with Quantum GIS in Tableau’

15. To make life easier in Tableau you can also add an additional ID column, I have created Location as a text field.
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16. You can now use Show Selected Features to give each point a name which you can place on the level of detail shelf in Tableau to separate out the points.

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17. Once all the points are named then you can paste into Excel and use as described in the previous post ‘Creating Background Image maps with Quantum GIS in Tableau’

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Richard Raistrick

Über den Autor 

BA-Universität Sheffield. 12 Jahre Erfahrung als Enterprise Software Technical Consultant/Ingenieur bei einem der weltweit größten Softwareunternehmen. Seit Anfang 2014 bei der Insight Dimension GmbH als Consultant / Entwickler tätig.

Further Editing Background Images with Quantum GIS for use in Tableau Reviewed by on .

In the last part we used a plan to plot coordinates on using QGIS. Let’s continue using the same map but using shapes this time to accelerate the process and to give more accurate points.

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