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geostatistics [2018/02/15 15:57] qcbs [Books] |
geostatistics [2020/02/26 14:24] qcbs [Digitize a polygon defining the boundary of your study site] |
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| You can digitize the boundary of your study site from a Google Satellite layer by following the following steps: | You can digitize the boundary of your study site from a Google Satellite layer by following the following steps: | ||
| - Open QGIS. | - Open QGIS. | ||
| - | - Activate the 'OpenLayers Plugin' in the list of Extensions | + | - Install and activate the QuickMapServices Plugin= |
| - | - Add a Google Satellite layer by using the OpenLayers extension (Web/OpenLayers Plugin). | + | - Add a Google Satellite layer by using the QuickMapServices extension (Web/QuickMapServices). You might need to enable additional providers in the Plugin settings |
| - | - Note that the CRS of the canvas is now 'Google Mercator' (WGS 84 / Pseudo mercator). | + | - Note that the CRS of the canvas is now WGS 84 / Pseudo mercator and units are in meters. |
| - If you have other vector layer that can help you define the limits of your study area, you can add them to the canvas by clicking on the 'add vector layer' icon. | - If you have other vector layer that can help you define the limits of your study area, you can add them to the canvas by clicking on the 'add vector layer' icon. | ||
| - Digitize the zone defining your study area. You first need to add a new polygon shapefile layer under Layer>New>New Shapefile layer. Specify the proper CRS depending on the extent of your study area and specify a name for your layer. It is always preferable to work with a reference system that uses meters as units, such as UTM (medium extent), MTM (small extent in Quebec) or Lambert (large extent). Refrain from using a latitude/longitude system. | - Digitize the zone defining your study area. You first need to add a new polygon shapefile layer under Layer>New>New Shapefile layer. Specify the proper CRS depending on the extent of your study area and specify a name for your layer. It is always preferable to work with a reference system that uses meters as units, such as UTM (medium extent), MTM (small extent in Quebec) or Lambert (large extent). Refrain from using a latitude/longitude system. | ||
