on February 1, 2023
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
on February 1, 2023
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
on February 1, 2023
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
on February 1, 2023
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
on February 1, 2023
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
on February 1, 2023
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
on February 1, 2023
How to merge layers from two vector tiles with Mapnik?
Geographic Information SystemsWhat are vector tile layers? A vector tile layer references a set of web-accessible vector tiles and a corresponding style that dictates how the tiles will draw. Vector tile layers are similar to web tile layers, but they store a vector representation of the data instead of a raster representation. What are vector map tiles?
on February 1, 2023
Converting native point datatype into Geometry(Point,4326) using PostGIS
Geographic Information SystemsWhat is PostGIS 4326? The units for spatial reference 4326 are degrees. So our answer is 122 degrees. What is PostGIS type geometry? geometry is a fundamental PostGIS spatial data type used to represent a feature in planar (Euclidean) coordinate systems. All spatial operations on geometry use the units of the Spatial Reference System the
on February 1, 2023
Writing if statement into ArcGIS Online Operations Dashboard / list options to configure style according to attribute value?
Geographic Information SystemsHow do I customize my ArcGIS dashboard? Create a dashboard Click the Apps button. in the header of your site and click ArcGIS Dashboards. Click Create Dashboard. Provide a title for your dashboard. Optionally, specify search tags, a summary, and a target folder. Click Create Dashboard. How do I count unique values in ArcGIS dashboard?
on February 1, 2023
Viewshed analysis of two buildings
Geographic Information SystemsHow is viewshed calculated? A viewshed is created from a DEM by using an algorithm that estimates the difference of elevation from one cell (the viewpoint cell) to the next (the target cell). To determine the visibility of a target cell, each cell between the viewpoint cell and target cell is examined for line of