Digitizing training and test areas
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## Confirm with {{button|text=OK}}. Let the new layer be added to the [[TOC]]. | ## Confirm with {{button|text=OK}}. Let the new layer be added to the [[TOC]]. | ||
##* If the points are hard to recognize on the [[QGIS GUI|canvas]], open the properties by double-clicking the layer in the [[TOC]] and adjusting size and color in the {{button|text=Style}} tab. | ##* If the points are hard to recognize on the [[QGIS GUI|canvas]], open the properties by double-clicking the layer in the [[TOC]] and adjusting size and color in the {{button|text=Style}} tab. | ||
| + | # Buffering sample points | ||
| + | ## Open {{mitem|text=Vector --> Geoprocessing tools --> Buffer}}. Select the generated points shapefile as input layer. | ||
| + | ## Enter 2000 (meter) as {{mitem|text=Buffer distance}}. | ||
| + | ## Enter a file path and name, e.g. ''188_pca_indices_buffer'', confirm with {{button|text=OK}} and confirm the following dialogue to let the result be added to the project. | ||
[[Category: QGIS exercises 2013/14]] | [[Category: QGIS exercises 2013/14]] | ||
Revision as of 17:22, 22 January 2014
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This section is still under construction! This article was last modified on 01/22/2014. If you have comments please use the Discussion page or contribute to the article! |
- This article is part of the QGIS tutorial 2013/14.
In this article you will learn how to create test areas for landscape classification.
- Generating sample points
- Load the raster map 188_pca_indices, which should be available in the course data.
- Open Vector --> Research tools --> regular points. If not selected by default, set the Input Boundary Layer to 188_pca_indices.
- Select the radio button Use this number of points and set the number to 50.
- Set Initial set from corner (LH side)
- Enter the file name and path by clicking Browse. You may use 188_pca_indices_points as a file name.
- Confirm with OK. Let the new layer be added to the TOC.
- Buffering sample points
- Open Vector --> Geoprocessing tools --> Buffer. Select the generated points shapefile as input layer.
- Enter 2000 (meter) as Buffer distance.
- Enter a file path and name, e.g. 188_pca_indices_buffer, confirm with OK and confirm the following dialogue to let the result be added to the project.
