System requirement specification for Big Data Postgesql, PostGIS, and GeoServer based service
Hiking & ActivitiesWhat 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
Hiking & ActivitiesHow 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?
Hiking & ActivitiesHow 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
Hiking & ActivitiesHow 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
Hiking & ActivitiesWhat 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)
Hiking & ActivitiesWhat 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