on February 12, 2023
File IMG from OSM
Geographic Information SystemsHow do I convert an OSM file to IMG? Use the command line Java program Mkgmap to convert the *. osm file to a Garmin img map file (always the same output filename, “63240001. img”, but you can rename it to a different 8-digit number after creation) . If your osm file is called test.
on February 12, 2023
Python QGIS crashes within categorized renderer setup
Geographic Information SystemsWhy does QGIS keep crashing? Create a new, clean profile (under Settings / User Profiles ). You will lose and/or have to recreate certain default settings, but fairly often QGIS crashes are caused by something (internal to QGIS, a plugin?) corrupting your user profile. How do I speed up PyQGIS? Optimising your feature requests is
on February 12, 2023
Python Script stopping for large files
Geographic Information SystemsHow to avoid loading a large file into a Python script repeatedly? Try to learn about Python data serialization. You would basically be storing the large file as a python specific, serialized binary object using python’s marshal function. This would drastically speed up IO of the file. See these benchmarks for performance variations. How do
on February 12, 2023
Temporal combination of Raster files?
Geographic Information SystemsHow do I combine multiple rasters into one? Open the Mosaic To New Raster tool by navigating to ArcToolbox > Data Management Tools > Raster > Raster Dataset. Insert the raster files. Select the output location. Specify a name and extension for the output. Specify the pixel type. Specify the number of bands. What
on February 12, 2023
Autocad 2018 not compatible with ArcGIS desktop?
Geographic Information SystemsIs ArcGIS compatible with AutoCAD? ArcGIS Pro supports the following AutoCAD and MicroStation file formats: Direct read—Supported CAD files are read as read-only feature datasets. You can add CAD feature classes and CAD feature datasets to maps and scenes directly from the Catalog pane or the Add Data tool. What is the latest version of
on February 12, 2023
How to open a QGIS Project with Optionspath and Configpath settings?
Geographic Information SystemsHow do I open an existing project in QGIS? Open an existing project Open QGIS. Note that when QGIS is opened you will be presented with a list of recent projects to chose from. Choose Project ‣ Open. Navigate to ‘/home/user/qgis-example’. Select the project ‘QGIS-NaturalEarth-Example. qgs’. Click ‘Open’. How do I open an ArcGIS project
on February 12, 2023
Merging/Dissolving multiple layers in QGIS Virtual Layer
Geographic Information SystemsCan you merge layers in Qgis? Open QGIS and add the vector layers that you want to merge to the map canvas. Click on the Processing menu and select Toolbox . In the toolbox window, search for the Merge Vector Layers tool and double-click on it to open the tool. In the Merge Vector Layers
on February 12, 2023
How to change color ramp in graduated classification with standard deviation using pyqgis
Geographic Information SystemsHow do you make a color ramp in Pyqgis? To create a new QGIS color ramp, or edit an existing one, go to the symbology tab. Then change the render type to ‘Singleband pseudocolor’. To create a new color ramp, right-click on the displayed color ramp and select ‘Create New Color Ramp’. How to Change
on February 11, 2023
Are British National Grid (BNG) 1km grid shapefiles displayed accurately in ArcMap?
Geographic Information SystemsWhat coordinate system does the UK national grid use? CRS for Great Britain and Ireland The CRS that should be used in Great Britain is the British National Grid. This is a planar coordinate system where the effects of earth curvature have been removed, allowing precise measurements to be made from geospatial data quoted in
on February 11, 2023
Create Table with postGIS geometry in Python
Geographic Information SystemsHow do I create a table in PostGIS? In the PostGIS documentation it says that there are two steps to creating a spatial table with SQL: Create a normal non-spatial table. Add a spatial column to the table using the OpenGIS “AddGeometryColumn” function. How to create a table in PostgreSQL using Python? To create