Spatialite : spatial index on geometries
Hiking & ActivitiesWhat is a spatial index PostGIS? Spatial indexes are used in PostGIS to quickly search for objects in space. Practically, this means very quickly answering questions of the form: “all the things inside this this” or. “all the things near this other thing” What is SpatiaLite used for? SpatiaLite is an open source library intended
OpenLayers only keeps the first drawn feature
Hiking & ActivitiesHow do you draw lines in OpenLayers? Select a geometry type from the dropdown above to start drawing. To finish drawing, click the last point. To activate freehand drawing for lines, polygons, and circles, hold the Shift key. To remove the last point of a line or polygon, press “Undo”. How do OpenLayers work? OpenLayers
Creating polygon from one line
Hiking & ActivitiesHow do you convert lines to polygons? To Convert Polyline Objects to Polygons Set the PROXYGRAPHICS system variable to 0. On the command line, enter mappolylinetopolygon. Press Enter. If you already had a selection set, the selected closed polylines are converted. If you did not have a selection set, select the polylines to convert. Press
How to get correct format of coordinates for export to geojson from QGIS?
Hiking & ActivitiesWhat are coordinates in GeoJSON? The coordinate reference system for all GeoJSON coordinates is a geographic coordinate reference system, using the World Geodetic System 1984 (WGS84) datum, with longitude and latitude units of decimal degrees. How do I get coordinates in QGIS? To start capturing coordinates, click on [Start capture]. You can now click anywhere
Getting outline of polygon as GeoJSON?
Hiking & ActivitiesWhat is the difference between polygon and Multipolygon? A MULTIPOLYGON is a collection of Polygons. MultiPolygons are useful for gathering a group of Polygons into one geometry. For example, you may want to gather the Polygons denoting a group of properties in a particular municipality.
Minimum enclosing polygons for point clusters
Hiking & ActivitiesWhat is MBR in GIS? In computational geometry, the minimum bounding rectangle (MBR), also known as bounding box (BBOX) or envelope, is an expression of the maximum extents of a two-dimensional object (e.g. point, line, polygon) or set of objects within its x-y coordinate system; in other words min(x), max(x), min(y), max(y). How do you