Calculate bounding box coordinates of a selected polygon with QGIS
Hiking & ActivitiesHow do you calculate bounding box? To make coordinates normalized, we take pixel values of x and y, which marks the center of the bounding box on the x- and y-axis. Then we divide the value of x by the width of the image and value of y by the height of the image. width
Can GPS transmission time be the same for two different ephemerides?
Hiking & ActivitiesHow long is GPS ephemeris valid? 4 hours The active ephemeris validity period is usually 4 hours, and, if exceed, the ephemeris data must be refreshed. Accordingly, the GPS/GNSS receiver can quickly calculate its position from the new ephemeris data (hot start) only for a maximum period of 4 hours. How often is GPS ephemeris
Assigning random points to unique values
Hiking & ActivitiesHow to randomly generate unique numbers in Java? Random rand = new Random(); selected = rand. nextInt(100); java.Explanation Generate a random number and add it to the new array. Generate another random number and check if it is already stored in the new array. If not then add it and continue. else reiterate the step.
Getting wrong lat/lang after transforming from “EPSG:900913” projection to “EPSG:4326”
Hiking & ActivitiesWhat projection is 900913? Answer. 900913 is used as a well-known ID (WKID) by some Web services for the spherical Mercator-based coordinate system used by Bing maps and Google maps. The 900913 value is a representation of the Google name and originated in the blog entry, Google Projection: 900913. What is the difference between EPSG
QGIS 3.2.2 OpenLayers plugin isn’t listed to install
Hiking & ActivitiesHow do I install QGIS 3.22 Plugins? Plugin installation Open QGIS on your computer. Select Manage and Install Plugins… in the Plugins tab: Find the Mergin Maps plugin and click Install Plugin: Close the Plugins dialog. The plugin toolbar should appear in QGIS: TIP. If you cannot see the toolbar, ensure Toolbar is checked under
Stratified Random Sampling by ID in QGIS?
Hiking & ActivitiesHow to do stratified random sampling in QGIS? Stratified random sampling In the Menu select Vector ‣ Research Tools ‣ Random Points. In the Output Shapefile click Browse and create a new Shapefile as strat_50pts. shp. Under the Stratified Sampling Design, type 50 in the Use this number of points. Click OK. Click Yes to