on February 20, 2023
How to Change Vector Datasource in QGIS 3.2.0?
Geographic Information SystemsHow do I edit vector data in QGIS? Editing Vector Data You can start editing at any time by selecting the layer you want to work with and clicking the icon, or right clicking on the layer you wish to edit and selecting “Toggle Editing.” Editing must be toggled separately for each layer. How do
on February 20, 2023
Calculating nearest distance between 2 points and creating line between them avoiding barrier using ArcGIS Desktop?
Geographic Information SystemsHow do you find the distance between two points in ArcGIS? Q: How do I calculate the distance between matched pairs of points in ArcGIS? Create a table that contains these fields (at the very least): Open the XY to Line tool (Data Management Tools > Features > XY to Line). Open the attribute table
on February 20, 2023
How to query Attribute table for identical entries in two columns
Geographic Information SystemsHow to check same values in 2 columns in SQL? In SQL, problems require us to compare two columns for equality to achieve certain desired results. This can be achieved through the use of the =(equal to) operator between 2 columns names to be compared. Can you group by multiple columns in SQL? Usage of
on February 20, 2023
Applying a custom 1 square mile grid
Geographic Information SystemsHow do I create a grid in ArcGIS? Add a custom grid In an active layout view, select the map frame in the Contents pane. On the Insert tab, in the Map Frames group, click Grid . Choose New Custom Grid . Select the custom grid in the Contents pane, right-click, and choose Properties. How
on February 20, 2023
Python GDALwarp cut a raster with a shapefile polygon
Geographic Information SystemsHow do you clip a raster with a shapefile in Python? To perform the clip you: Open the raster dataset that you wish to crop using xarray or rioxarray. Open your shapefile as a geopandas object. Crop the data using the . clip() function. How do you clip a raster with a polygon? Here
on February 20, 2023
Raster to vector -> vector to mean line with one attribute
Geographic Information SystemsHow do I convert a raster to a vector? 5 Steps for Converting Raster to Vector in Illustrator Open your raster file in Illustrator. Without a design file open, we can head to the File dropdown > Open > Select the file > Open. Use the Image Trace tool. Remove interior geometry and negative space.
on February 20, 2023
ArcGIS remove negative values from DEM, DEM max increases
Geographic Information SystemsWhy does Dem show negative values? The negative values usually implies that the Z values are below a reference Z= 0 defined spot for sea level (see here for more explanations). How do I remove values from raster in ArcGIS? Click the Raster Cleanup menu on the ArcScan toolbar and click Start Cleanup. Click Erase
on February 20, 2023
How can I export a GeoJSON file from R?
Geographic Information SystemsHow do I export a GeoJSON file? To export data, click on Special – Export to GeoJSON. Clicking on this item will display the dialog as in the following figure. In this dialog, you can setup the GeoJSON export. You can choose from two export modes – Selected Layer of All Visible Layers. Can R
on February 20, 2023
GPS: what limits the _rate_ of change in altitude?
Geographic Information SystemsWhat altitude does GPS limit? Most civilian GPS receivers will stop working at an altitude of roughly 18,000 m ~ 60,000 ft. This prevents most trackers from being able to update your payload’s position above 18,000 m. Sometimes it is possible to obtain specialized GPS receivers (more expensive) that work above 18,000 m. How does
on February 20, 2023
Changing min and max values for raster layer in QGIS
Geographic Information SystemsHow do I change values in raster QGIS? Editing DEM pixels values in QGIS using Serval Plugin Probe button allows you to check the cell values in the raster. Drawing button activate the ability to modify the values of a raster cell. Clicking on the Set raster cell values to NoData button and then in