Setting QGIS Python version?
Geographic Information SystemsWhich version of Python does QGIS use? 3.28 version at https://qgis.org/pyqgis/3.28. How do I change Python version in Python? As a standard, it is recommended to use the python3 command or python3. 7 to select a specific version. The py.exe launcher will automatically select the most recent version of Python you’ve installed. You can also
Accessing data in HEC-HMS that cannot be exported?
Geographic Information SystemsHow do I export data from HEC-HMS? From the Input ribbon menu, select Export Data menu item, and then choose Export HEC‑HMS to CAD command. How do I export my HEC RAS model? From the Input ribbon menu, click the Export Data dropdown menu and then select the Export HEC‑RAS Project command. The Export HEC‑RAS
Choosing correct zoom level to display given area in square km using Leaflet?
Geographic Information SystemsHow do you change the zoom level in leaflet? To enable it, use the map’s zoomSnap option. The zoomSnap option has a default value of 1 (which means that the zoom level of the map can be 0 , 1 , 2 , and so on). If you set the value of zoomSnap to 0.5
System requirement specification for Big Data Postgesql, PostGIS, and GeoServer based service
Geographic Information SystemsWhat are the recommended system requirements for PostgreSQL? Hardware Requirements The minimum hardware required to install and run PostgreSQL are: 1 GHz processor. 2 GB of RAM. 512 MB of HDD. Does GeoServer need PostGIS? To host GeoServer, you need the PostgreSQL database extended with PostGIS. This spatial extension adds support for geographic objects, allowing
QGIS Graphical Modeler not finding output files
Geographic Information SystemsHow to use graphical modeler in QGIS? Starting Graphical Modeller To start a model in QGIS, we have to open a graphical modeller window from Processing menu then select Graphical Modeler as shown in figure 2. An empty graphical modeller window will be opened as in figure 3. In the graphical modeller window, we can
R How to multiply the values of the raster pixels with the true surfaces of these pixels?
Geographic Information SystemsHow to extract pixel values from raster in R? Extract Raster Values from Points using R Step 1: Create a Raster stack or Raster brick of your raster files using “raster” package in R. Step 2: Read point data, and convert them into spatial points data frame. Step 3: Extract raster value by points. Step
How can I add custom label to overpass turbo result
Geographic Information SystemsHow do I query overpass Turbo? Click the green run button to try the query against the live database. Your browser will open up a new page, loading the query and the description into the Overpass Turbo IDE. The query will run automatically so you can see the results. Many of the queries include commented
Validation of Regression Kriging
Geographic Information SystemsWhat is cross validation in kriging? Cross validation is often used for testing “moving neighborhood” kriging models; in this case, each unknown value is predicted from a small number of surrounding data. In “unique neighborhood” kriging algorithms, each estimation uses all the available data; as a result, cross validation would spend much computer time. How
GDAL: use virtual file system (VSI) as datasource in virtual format (VRT files)
Geographic Information SystemsWhat is VRT GDAL? The VRT driver is a format driver for GDAL that allows a virtual GDAL dataset to be composed from other GDAL datasets with repositioning, and algorithms potentially applied as well as various kinds of metadata altered or added. VRT descriptions of datasets can be saved in an XML format normally given
Extracting NDVI value for GPS points – how can I extract NDVI value for specific date and time for each GPS point?
Geographic Information SystemsHow to extract NDVI values? In this tutorial, we will extract NDVI values from a raster time series dataset in R and plot them using ggplot .Install R Packages raster: install.packages(“raster”) rgdal: install.packages(“rgdal”) ggplot2: install.packages(“ggplot2”) More on Packages in R – Adapted from Software Carpentry. Apr 8, 2021 How is NDVI data calculated? In Landsat