Point sampling on raster

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= First phase systematic sampling =
 
# Click {{mitem|text=Plugins --> Manage and Install Plugins}}.
 
# Click {{mitem|text=Plugins --> Manage and Install Plugins}}.
 
# Type in the search bar {{typed|text=Point sampling tool}}, click on the plugin name and then on {{button|text=Install plugin}}.
 
# Type in the search bar {{typed|text=Point sampling tool}}, click on the plugin name and then on {{button|text=Install plugin}}.
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# Load the single band raster file ''C_ID.tif'' created by [[Convert vector to Raster]].
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# Load the single band raster file ''C_ID.tif'' created by [Convert vector to Raster].
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# Load the regular grid as vector point file ''systeamtic_grid100.shp''' created by [[Create regular point grid]].
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# Load the regular grid as vector point file ''systematic_grid100.shp''' created by [Create regular point grid].
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# Make sure that both layers are ticked in the [TOC].
 
# Open the '''Point Sampling Tool''' clicking [[File:Qgis_psample_button.png]].
 
# Open the '''Point Sampling Tool''' clicking [[File:Qgis_psample_button.png]].
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# Select the layer containing sampling points.
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# Specify the output of the resulting vector file marking column with '''CTR + left click'''.
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# Enter an output shapefile name ''systematic_grid100_cid.shp'' and path by clicking {{button|text=Browse}}.
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# Confirm with {{button|text=OK}}. The new layer is added to the Layer Panel .
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= Second phase: stratified sampling with equal allocation =
  
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## Open {{mitem|text=Vector --> Research tools --> regular points}}. Set the {{button|text=Input extent Layer}} to ''Use layer/canvas extent''.
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## Confirm with {{button|text=OK}}. The new layer is added to the Layer Panel .
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## Enter the number 600 (meters) to {{button|text=Point spacing}}.
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## Click {{button|text=Use point spacing}} on.
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## Enter an output shapefile name ''systematic_grid.shp'' and path by clicking {{button|text=Browse}}.
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## Confirm with {{button|text=Run}}. The new layer is added to the Layer Panel .
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[[category:Working with Vector Data]]
 
[[category:Working with Vector Data]]

Revision as of 13:53, 26 November 2017

First phase systematic sampling

  1. Click Plugins --> Manage and Install Plugins.
  2. Type in the search bar Point sampling tool, click on the plugin name and then on Install plugin.
  3. Load the single band raster file C_ID.tif created by [Convert vector to Raster].
  4. Load the regular grid as vector point file systematic_grid100.shp' created by [Create regular point grid].
  5. Make sure that both layers are ticked in the [TOC].
  6. Open the Point Sampling Tool clicking Qgis psample button.png.
  7. Select the layer containing sampling points.
  8. Specify the output of the resulting vector file marking column with CTR + left click.
  9. Enter an output shapefile name systematic_grid100_cid.shp and path by clicking Browse.
  10. Confirm with OK. The new layer is added to the Layer Panel .

Second phase: stratified sampling with equal allocation

    1. Confirm with OK. The new layer is added to the Layer Panel .
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