on January 24, 2023
Changing column datatype with QGIS Field Calculator
Geographic Information SystemsHow do I change column data type in QGIS? Use Refactor Field in the Processing Toolbox. This will open the Refactor fields window where you can select the layer that you want to make changes to. From the Type drop down choose Integer or Double depending if you want a whole number or a decimal
on January 24, 2023
Calculating value sum of cells inside drawn polygon using ArcMap?
Geographic Information SystemsHow do I count points in a polygon in ArcGIS? Specify the point shapefile from Step 1. Select the first bullet, Each polygon is given a summary of the numeric attributes…, and check the Sum box. Specify an output location, and click OK. A polygon shapefile with the ‘Count’ field indicating how many point features
on January 24, 2023
How is it possible to calculate azimuth from a single lat lon cordinate with x, y offsets in meters?
Geographic Information SystemsHow do you find azimuth from coordinates? You can calculate the azimuth between the points (ϕ₁, λ₁) and (ϕ₂ λ₂), where ϕ is the latitude and λ longitude, as follows: Compute x = sinΔλ × cosϕ₂, where Δλ = λ₂ – λ₁ is the difference in longitudes. How do you calculate azimuth setting? Quote from
on January 24, 2023
Wetlands Symbol for QGIS point pattern fill
Geographic Information SystemsHow do I get more symbols in Qgis? QGIS allows you to do this using symbol layers. Go back to the landuse layer’s symbol properties panel (by clicking Simple fill in the symbol layers tree). In this example, the current symbol has no outline (i.e., it uses the No Pen border style). Select the Fill
on January 24, 2023
How do I produce a GeoJSON with 1 point at a certain lon/lat?
Geographic Information SystemsHow do I create a GeoJSON file with coordinates? Creating a GeoJSON file Launch geojson.io from http://geojson.io/#map=2/20.0/0.0. Navigate to your area of interest (AOI) Click on the type of shape you wish to draw in the toolbar. I will be using a polygon in this instance. To save your AOI as a GeoJSON file click
on January 24, 2023
Some labels appear in ArcMap while others do not
Geographic Information SystemsHow do I get all labels to show up in ArcMap? You can force the placement of all the labels belonging to a given label class on the map with the Never remove (place overlapping) option. How do I stop labels overlapping in ArcMap? You can reduce the chance that important features from a given
on January 24, 2023
How does Nearest Neighbor Image Resampling work in ArcGIS?
Geographic Information SystemsHow does nearest neighbor resampling work? Nearest neighbor is a resampling method used in remote sensing. The approach assigns a value to each “corrected” pixel from the nearest “uncorrected” pixel. The advantages of nearest neighbor include simplicity and the ability to preserve original values in the unaltered scene. What is nearest neighbor resampling in GIS?
on January 24, 2023
Bounding box – generate coordinates
Geographic Information SystemsHow do you find the coordinates of a bounding box? Coordinates of a bounding box are encoded with four values in pixels: [x_min, y_min, x_max, y_max] . x_min and y_min are coordinates of the top-left corner of the bounding box. x_max and y_max are coordinates of bottom-right corner of the bounding box. What is Bbox
on January 24, 2023
Random Forest out of the bag and confusion matrix
Geographic Information SystemsWhat is out-of-bag in random forest? The out-of-bag (OOB) error is the average error for each calculated using predictions from the trees that do not contain in their respective bootstrap sample. This allows the RandomForestClassifier to be fit and validated whilst being trained [1]. What is confusion matrix in random forest? The confusion matrix contains
on January 24, 2023
Returning current attribute name in QGIS Expression Dialog
Geographic Information SystemsHow to use expression dialog in QGIS? Double-clicking an item adds it to the expression editor. A help panel displays help for each selected item in the function selector. Press Ctrl + Click when hovering a function name in an expression to automatically display its help in the dialog. Display the list of All Unique