Reprojecting between NAD27 and WGS 84?
Hiking & ActivitiesWhat is the difference between WGS84 and NAD27? For example, the latitude and longitude location in a NAD27 datum differs from that same benchmark in NAD83 or WGS84. This difference is known as a datum shift. Depending on where you are in North America, NAD27 and NAD83 may differ in tens of meters for horizontal
How to create a table which showing attributes from one layer and another?
Hiking & ActivitiesHow do I copy an attribute table from one shapefile to another? Copying and pasting attribute values Click the Edit tool. on the Editor toolbar and select the features. Click the Attributes button. In the Attributes window, right-click the feature you want to copy from and click Copy Attributes. Right-click the feature you want to
How to change attributes with QGIS Python?
Hiking & ActivitiesHow do I change attribute values in Qgis? Right click the layer in the Layers Panel then click the Open Attribute Table menu option. Click the Toggle Editing Mode button. Click the New Field button. Input the field’s Name, Type, and Length, then click the OK button. How do I change the datatype of a
Merge intersecting polygons into one which are part of the same feature
Hiking & ActivitiesHow do I merge polygons with the same attribute in Arcgis? Note: Click the Edit tool. on the Editor toolbar. Click the features you want to merge. The features must be from the same layer. Click the Editor menu and click Merge. Click the feature that the features will be merged into and will supply
Why is geography faster than geometry for distance calculations?
Hiking & ActivitiesWhat is the difference between geometry and geography? Geometry, where it assumes all of your data lives on a Cartesian plane (like a map projection); Geography, where it assumes that your data is made up of points on the earth’s surface, as specified by latitudes and longitudes. How do we calculate distance in geography? Summary.
Substracting raster values from 2 rasters with different cell sizes
Hiking & ActivitiesHow do you subtract two raster layers in Arcgis? Procedure In ArcMap, navigate to ArcToolbox > Spatial Analyst Tools > Map Algebra > Raster Calculator. In the Raster Calculator window, double-click one of the rasters to be analysed, click the minus sign (-), and double-click the second raster. Specify the name and location for the