Layer failed to load using PyQGIS on macOS Mojave
Hiking & ActivitiesWhat is PyQGIS? PyQGIS is the Python environment inside QGIS with a set of QGIS libraries plus the Python tools with the potential of running other powerful libraries as Pandas, Numpy or Scikit-learn. This tutorial shows the main parts of the Python environment and has some practical cases of vector data layers. What version of
Calculate velocity and errors from distance between GPS points
Hiking & ActivitiesHow do you find velocity with GPS coordinates? First we plot the two GPS points on a spherical model of the earth, then calculate the angle between them using a dot product, then calculate the ‘Great Circle’ distance using this angle and the earth’s radius and finally we divide by the elapsed time to approximate
ArcMap attribute joins generating incorrect values
Hiking & ActivitiesWhy does the attribute table have null or empty values after a join? After performing a join, the values in the fields from the joined table might appear empty or null. Null values can be the result of several factors: Values in the specified fields for the join do not match. Joins are case sensitive,
Calculate new Lat/Lon from initial Lat/Lon plus Cartesian X,Y
Hiking & ActivitiesHow do you convert XY coordinates to latitude and longitude? Calculate latitude and longitude using the formula: latitude = asin (z/R) and longitude = atan2 (y,x). In this formula, we have the values of x, y, z and R from step 2. Asin is arc sin, which is a mathematical function, and atan2 is a
Using QGIS shapefile layer in ArcMap project?
Hiking & ActivitiesCan I use QGIS file in ArcGIS? The basic data is usable in qgis. Arcgis is the native software that shape files are used in. Now shape files are in the open specification realm. There are many other data formats though that both qgis and arcgis read and write. How do I convert QGIS to
How do I save a polygon once I have created it in editor?
Hiking & ActivitiesHow do you save a polygon? You need to finish the polygon’s construction with double click, right-click>Finish Sketch or F2 before saving edits. How do I save an edited shapefile in ArcGis? 1 Answer Start ArcGis and add data to the Data Frame, if needed. Right-click the layer and select Data > Export Features. Click