How to draw weighted voronoi polygons (thiessen) from points in QGIS?
Geographic Information SystemsHow do you make a Voronoi polygon? We start by joining each pair of vertices by a line. We then draw the perpendicular bisectors to each of these lines. These three bisectors must intersect, since any three points in the plane define a circle. We then remove the portions of each line beyond the intersection
No update of QGIS (3.10) possible on Ubuntu 18.04 – broken packages
Geographic Information SystemsHow do I update QGIS to latest version in Ubuntu? Quote from video: So what you'll want to do first is go to the QGIS. Downloads page you can just go – straight to QGIS org. And then go to download now. What is the latest version of QGIS in Ubuntu? The current version is
Need symbology that allows for symbols based on multiple fields, sometimes simultaneously (for certain features)
Geographic Information SystemsHow to symbolize points based on multiple attribute values in ArcGIS Pro? Click Vary symbology by attribute icon in the same Symbology pane. Select Size, and select the field to symbolize. Optionally, click Set an expression to set an expression on the values in the selected fields. In some instances, the values in the selected
How to properly assign spatial reference to converted AutoCAD data?
Geographic Information SystemsHow do I add a spatial reference in AutoCAD? You can define a spatial reference for CAD datasets in the following two ways: Use the CAD Feature Dataset Properties dialog box. Use the Define Projection geoprocessing tool. How do you add a spatial reference? You can create a spatial reference with a set coordinate system,
Auto-recalculating M-values using ArcPy in ArcGIS Pro
Geographic Information SystemsCan you use ArcPy with ArcGIS pro? The ArcPy package is part of the default Python distribution arcgispro-py3 that is provided with ArcGIS Pro and ArcGIS Server. Customization of the arcgispro-py3 Python environment through the addition of Python packages or other modifications is not recommended. How do I create sequential numbers in a field in
What software would be useful to create General Transit Feed Specification (GTFS)?
Geographic Information SystemsHow do I create GTFS data? Getting Started Create all the required files described in the GTFS Schedule reference. Create the optional files if their functionality is desired. Save all files in the . txt format. Zip all the text files together. The zipped file comprises a version of the feed. Publish the feed by
QGIS Update Column
Geographic Information SystemsHow do I update columns in QGIS? From the attribute table, open the field calculator (you need to be editing the layer in order to be able to open the field calculator). Ensure that “Only update selected features” is turned on, and set the “Update existing field” to “f”. Type “1” into the “Field calculator
Large scale map projection (ca. 20 km) in pyproj results in wrong distance
Geographic Information SystemsWhat does it mean when a map projection distorts the earth? A map that preserves shape is conformal. Even on a conformal map, shapes are a bit distorted for very large areas, like continents. A conformal map distorts area—most features are depicted too large or too small. The amount of distortion, however, is regular along
How do you do a cx_oracle executemany with a geofield
Geographic Information SystemsWhat is the default Arraysize in cx_Oracle? Due to the performance benefits, the default Cursor. arraysize is 100 instead of the 1 that the DB API recommends. This value means that 100 rows are fetched by each internal call to the database. What is a cx_Oracle cursor? May 10, 2022. Share. cx_Oracle is a Python
Download OpenStreetMap data -> connection refused
Geographic Information SystemsHow do I download data from OpenStreetMap? Go to openstreetmap.org and zoom to the extent of your area of interest using the search box or the mouse. Click on Export Data in the sidebar on the left to bring up the Export pane. If you are satisfied with the visible extent, click Export. You will