Why are my polygon features area being calculated as zero?
Hiking & ActivitiesHow do you find the area of a polygon? The formula to calculate the area of a regular polygon is, Area = (number of sides × length of one side × apothem)/2, where the value of apothem can be calculated using the formula, Apothem = [(length of one side)/{2 ×(tan(180/number of sides))}]. How do you
Removing parts of raster layer with QGIS (equivalent of vector difference tool)?
Hiking & ActivitiesHow do I trim a raster image in QGIS? Clipper Tool Verify the raster you want clipped is the Input file. Click “Select…” next to the Output file, find your working folder, and name the output raster. Click the radio button next to Mask layer and use the drop-down arrow to select the layer you
Using QGIS SpatiaLite/Geopackage databases on shared network drives
Hiking & ActivitiesCan you open a GeoPackage in QGIS? You are now ready to add any layer from this GeoPackage to QGIS. Click on the Connect button. In the central part of the window you should now see the list of all the layers contained in the GeoPackage file. Select the roads layer and click on the
Comparing two spatial datasets statistically
Hiking & ActivitiesHow do you compare spatial distributions? To analyze the spatial distribution of attribute values (not features itself, but certain attribute values), you can divide (weigh) the values by distance to neighbors and create a frequency distribution. You can then compare that against a uniform or random distribution. What is the statistical test for spatial distribution?
Is QGIS multi-threaded?
Hiking & ActivitiesDoes QGIS use multiple cores? QGIS uses by default only one CPU core for rendering, but you can change this. Multi-threaded rendering should speed up your performance significantly! How do I enable multithreading in QGIS? To enable it, open the Options dialog, select the Rendering tab and check the Render layers in parallel using many
Check data from ArcPad
Hiking & ActivitiesWhere is Arc map data? The following steps describe how you can view your data in ArcMap: Start ArcMap, open the Catalog window, and connect to your database. Click the table in the Catalog tree to select it. To view the data, drag the table from the Catalog window to the table of contents or