Creating new shapefile using pyshp
Hiking & ActivitiesHow do you use PyShp? Using PyShp create a Reader object to access the data from the Ireland_LA Shapefile. Create a Writer object to write data to as a new Shapefile. Set variables for access to the field information of both the original and new Shapefile. We will grab all the field info from the
Calculating area with formula gives zero in the attribute table in QGIS
Hiking & ActivitiesHow do I replace null with 0 in QGIS? You can do this directly in the field calculator: Open the field calculator. Check the “Update Existing Field” box. Select the field you want to work on. Enter the following expression in the expression box: if(“fieldname” is null, 0, “fieldname”) , replacing fieldname with the actual
Intersection of points for overlapping polygons
Hiking & ActivitiesHow do you fix overlapping polygons? Removing overlaps from existing polygons Select the polygon feature whose border you want to maintain. The other polygon will be clipped back to match it. Click the Editor menu and click Clip. Set the buffer distance to 0 and choose to discard the area that intersects. Click OK. How
Unsupervised classification in Google Earth Engine
Hiking & ActivitiesHow do you use unsupervised classification in Google Earth Engine? Unsupervised Classification (clustering) Assemble features with numeric properties in which to find clusters. Instantiate a clusterer. Set its parameters if necessary. Train the clusterer using the training data. Apply the clusterer to an image or feature collection. Label the clusters. Can unsupervised learning be used
Editing multiple layers using QGIS?
Hiking & ActivitiesHow do I edit multiple layers in QGIS? Select the layer in the Layers panel and click Layer | Toggle Editing. Alternatively you can right click on a layer in the Layers panel and choose Toggle Editing from the context menu. Multiple layers can be edited at a time. The layer currently being edited is
Visibility of multiple points from one other point?
Hiking & ActivitiesWhat is a line-of-sight analysis? Line-of-sight (LOS), also called “viewshed analysis,” can be used to determine what can be seen from a particular location in the landscape. Conversely, the same analysis also determines from where within the surroundings that location can be seen. What is Viewshed analysis used for? A viewshed identifies the cells in