on February 19, 2023
Risk Maps – Spatial Analysis
Geographic Information SystemsWhat is spatial risk analysis? Spatial Risk Management is based on geospatial analysis, which is taught e.g. in Graduate Programmes. The term Risk adds to the methods of statistical analysis and numerical analysis a special focus on geographical aspects of public/environmental health risks or potential damage to infrastructure and services. What is spatial analysis in
on February 19, 2023
How to use Mapbox geocoder in OpenLayers application?
Geographic Information SystemsWhat is the difference between OpenLayers and Mapbox GL? Mapbox GL JS (standing for Graphics Library) is a JavaScript library that allows you to create maps that can include interactive data. OpenLayers is an open source JavaScript library used for displaying map data in web browsers. It allows putting dynamic maps in web pages. How
on February 19, 2023
Background map as open data from geoserver
Geographic Information SystemsHow to add basemap in GeoServer? Click the generate bounds button to have GeoServer compute the group bounds from the layers inside of it. Ensure that your Geoserver is up, and open a desktop client (our case, Udig). Once both GeoServer and uDig are up, organize their windows so that you can see GeoServer and
on February 19, 2023
Calculating area for range of values of spectral indices in QGIS?
Geographic Information SystemsHow do you find the area of a raster value in QGIS? The function get_raster_area is used to calculate the total area of the raster. This is achieved by getting the total area of each cell and then multiply by the number of cells in the coverage raster. The function get_area calculates the total area
on February 19, 2023
Ogr2ogr won’t read directory of GeoJSON into GPKG
Geographic Information SystemsWhat formats does ogr2ogr list? Ogr supports many data formats here is a subset of the ones we commonly use: ESRI Shapefile, MapInfo Tab file, CSV, DBF, GML, KML, Interlis, SQLite, GeoPackage,SpatiaLite, ODBC, ESRI GeoDatabase (MDB format), ESRI GDB database, PostGIS/PostgreSQL, MySQL. What does ogr2ogr do? ogr2ogr can be used to convert simple features data
on February 19, 2023
How to add a save and load button in a Python-addin ArcGIS?
Geographic Information SystemsHow do I add a PYT file to ArcGIS? In the list of side tabs, click the Exection tab. Type your Python code directly in the Execution tab. If encrypting your code is required, click the Encrypt button. and then provide a password. Optionally, if you already have a script, click the Folder button. and
on February 18, 2023
Extracting data from GeoMedia *.mdf database without using GeoMedia?
Geographic Information SystemsHow to extract data from MDF file? How to Export Data from MDF to Excel File? Open SQL Server Object Explorer. Select the database you want to export from the list and right-click to select Tasks >> Export Data. How to read MDF file without SQL Server? The only way to access MDF files
on February 18, 2023
Minimum number of satellites per constellation in Multi-constellation Navigation
Geographic Information SystemsWhat is the minimum number of satellites needed for a full constellation? As discussed above, the GPS constellation is configured so that a minimum of four satellites is always “in view” everywhere on Earth. How many satellites are in the GPS constellation? To accomplish this, each of the 31 satellites emits signals that enable receivers
on February 18, 2023
Enabling “Show all labels for this layer (including colliding labels)” in PyQGIS
Geographic Information SystemsHow do you make all labels visible in Qgis? Turn on Labels in QGIS Right-click on the layer and select the properties option from the menu. Then click on Labels and set up the field you want to label on. Under rendering, make sure the “Show all labels” box is checked. How do I turn
on February 18, 2023
Changing layer id in QGIS
Geographic Information SystemsHow do I change layers in QGIS? Select the layer in the Layers panel and click Layer | Toggle Editing. Alternatively you can right click on a layer in the Layers panel and choose Toggle Editing from the context menu. Multiple layers can be edited at a time. The layer currently being edited is the