on February 22, 2023
Routing for specific subjects (cars, pedestrians, ..) dynamically
Geographic Information SystemsWhat is dynamic vehicle routing? The Dynamic Vehicle Routing Problem (DVRP) is one of the important variants of VRP. Its aim consists in designing the optimal set of routes for a fleet of vehicles in order to serve a given set of customers while new customer orders arrive during the performance of the planned earlier
on February 22, 2023
PostGIS ST_Difference function returns wrong geometry in result
Geographic Information SystemsWhat is the difference between ST_Contains and ST_Within in PostGIS? ST_Within(geometry A , geometry B) returns TRUE if the first geometry is completely within the second geometry. ST_Within tests for the exact opposite result of ST_Contains. ST_Contains(geometry A, geometry B) returns TRUE if the second geometry is completely contained by the first geometry. What is
on February 22, 2023
Passing each parsed file name to next tool in ModelBuilder?
Geographic Information SystemsHow do you connect things in model builder? Type directly in ModelBuilder to open the Add Tools To Model dialog box and search for a specific tool. You can add a tool to the model by double-clicking it. You can also drag one or multiple tools from the search results. The Add Tools To Model
on February 22, 2023
GeoServer how to permit to user to see only the his data
Geographic Information SystemsHow do I publish data in GeoServer? In a web browser, navigate to http://localhost:8080/geoserver . Log into GeoServer as described in the Logging In section. Navigate to Data ‣ Workspaces. Workspaces page. Click the Add new workspace button. You will be prompted to enter a workspace Name and Namespace URI. Click the Submit button. How
on February 22, 2023
Error in Resample
Geographic Information SystemsWhat is resample (‘ MS ‘) in Python? Resampling is used in time series data. This is a convenience method for frequency conversion and resampling of time series data. Although it works on the condition that objects must have a datetime-like index for example, DatetimeIndex, PeriodIndex, or TimedeltaIndex. What is resample used for? Resampling is
on February 22, 2023
Differentiating bare soil and urban areas in Landsat 4-5 land cover classification
Geographic Information SystemsHow is urban land cover classified? The urban land cover is classified into five different classes Bare land, water, vegetation, residential and buildings and road network. What is bare soil index? Bare Soil Index (BSI) is a numerical indicator that combines blue, red, near infrared and short wave infrared spectral bands to capture soil variations.
on February 22, 2023
Removing no data and saving raster file using PyQGIS
Geographic Information SystemsHow do I remove no data from raster QGIS? If you are only creating a map you can hide these values in QGIS by going to your layer properties –> transparency and then selecting the values you want to hide. Save this answer. How to convert NoData to 0 in QGIS? The simplest one-step and,
on February 22, 2023
Matching points in table to polygons
Geographic Information SystemsHow do you convert points to polygons? Procedure. Use the Points To Line tool with the ‘Close Line’ option checked to ensure every output line feature’s end point matches up with its start point, followed by the Feature To Polygon tool to connect the points to create a polygon. How do I convert points to
on February 22, 2023
Defining Bertin1953 projection in QGIS 3.18.2 Zürich
Geographic Information SystemsHow do you define projection in QGIS? To determine the projection of a layer, right click on the layer under the Layers window on the left side of the QGIS window. Next, under the Properties window, click on the Metadata tab. The CRS assigned to the layer can be seen under the label Layer Spatial
on February 22, 2023
Preload map tiles that are outside current map view in Leaflet
Geographic Information SystemsCan leaflet use vector tiles? Leaflet doesn’t support vector tiles by default. For basemaps, it is recommended to use it with traditional raster tiles (Mercator XYZ). Such tiles can be generated on demand for any of the GL styles with the open-source server software called TileServer GL. What is Tilelayer in leaflet? Used to load