Shape ID is lost after converting a shapefile into a raster in QGIS
Geographic Information SystemsHow do I convert a shapefile to a raster in Qgis? To convert a vector to a raster format, QGIS provides the Rasterize tool. This tool converts a shapefile to a raster and applies the values in a specified attribute field to the cell values. To access the Rasterize tool, click on Rasterize (Vector to
Which GUI system for apps?
Geographic Information SystemsWhat is a GUI for an app? A graphical user interface is an application that has buttons, windows, and lots of other widgets that the user can use to interact with your application. A good example would be a web browser. It has buttons, tabs, and a main window where all the content loads. What
How to trace a polygon from a search engine image?
Geographic Information SystemsHow do I trace an image in Qgis? From the Snapping Toolbar choose the Enable Tracing button. Start the new feature by choosing a vertex to snap to and then simply move the cursor around your object and the TRACE tool will automatically select the vertices between the start point and your current location. How
How to extract the maximum value from an array in the QGIS Field Calculator?
Geographic Information SystemsHow do you find the maximum value of an array? To find the largest element from the array, a simple way is to arrange the elements in ascending order. After sorting, the first element will represent the smallest element, the next element will be the second smallest, and going on, the last element will be
Installing QGIS on Mac OS X 10.13.2 with Python 3.4
Geographic Information SystemsHow do I install QGIS 3.24 on Mac? Installing QGIS on MacOS Step 1: Visit the official website using the URL https://www.qgis.org/ in any web browser. Step 2: Click on the Download Now button. Step 4: Now check for the installer file in the downloads folder in your system and open it. How to install
Issues with extract by mask tool
Geographic Information SystemsWhat is the difference between raster clip and extract by mask? Clip only does a rectangular area (envelope) however extract by mask will extract to an irregular/multipart/doughnut polygon. If you want only the data in an extent use clip, it’s much faster, but if you need to trim to an irregular shape then use extract
How to check a polyline is self intersecting
Geographic Information SystemsHow do you find the self-intersecting polyline? To find any self-intersections and duplicate vertices, you can use the freeware utility CADstudio SelfIntersect, which can be downloaded from Download. Load the VLX file with APPLOAD, type the command SELFINTERSECT and select a polyline (or use “M” for multiple, or “H” for this help). How do you
Postgis KNN vs ST_DWithin for nearest neighbour search with a radius
Geographic Information SystemsWhat are the problems with nearest neighbor analysis? One associated problem is that of a point whose nearest neighbor lies outside a defined boundary. Ignoring the point results in a pattern description which is biased toward dispersion. Including the point makes the definition of density subject to challenge, but produces a less biased pattern appraisal.
Extracting Data from Raster based on Aspect Raster file
Geographic Information SystemsHow do I extract values from a raster? To extract values from multiple rasters or a multiband raster dataset, use the Extract Multi Values To Points tool. The interpolation option determines how the values will be obtained from the raster. The default option is to extract the exact cell value at the input locations. How
IDLE keeps restarting (RESTART: Shell) when running arcpy.CopyRaster_management
Geographic Information SystemsWhy does my Python shell keep restarting? Buggy RESTART in Python occurs if the user subprocess crashes. This Crashes can come from a bug in your program (infinite loop that full memory for exemple) or from a corrupted OS. How do I restart IDLE shell? To execute a file in IDLE, simply press the F5