Where can I get British Agricultural Field Boundaries as Vector Data?
Hiking & ActivitiesWhat are examples of vector data? Vector data is represented as a collection of simple geometric objects such as points, lines, polygons, arcs, circles, etc. For example, a city may be represented by a point, a road may be represented by a collection of lines, and a state may be represented as a polygon. What
OSM postgis radius search
Hiking & ActivitiesHow do I find the distance between two points in PostGIS? Solutions 1) Using ST_DistanceSpheroid to Calculate the Spherical Distance Between Two Geometric Points in a Spherical Coordinate System. 2) Using ST_Distance to Calculate the Distance Between Two Geometric Points on the Projected Plane in a Projected Coordinate System. How do I import OSM data
Calculate distance between consecutive GPS points for each id
Hiking & ActivitiesHow do you find the distance between GPS points? To measure the distance between two points: On your computer, open Google Maps. Right-click on your starting point. Select Measure distance. To create a path to measure, click anywhere on the map. To add another point, click anywhere on the map. When finished, on the card
Fill Ring tool problem
Hiking & ActivitiesWhy can’t i add a ring in QGIS? When a polygon has invalid geometry, QGIS doesn’t know where the inside of the polygon is. Since a ring must be placed inside a polygon, attempting to place a ring inside an invalid geometry will give this error. Common geometry errors include: Duplicate vertices: one vertex directly
Add quotation around
Hiking & ActivitiesHow do you put quotes around a string? To place quotation marks in a string in your code In Visual Basic, insert two quotation marks in a row as an embedded quotation mark. Insert the ASCII or Unicode character for a quotation mark. You can also define a constant for the character, and use it
NDVI calculation
Hiking & ActivitiesHow To Calculate NDVI? NDVI is calculated with the following expression: NDVI = (NIR-Red) / (NIR+Red), where NIR is near-infrared light and Red is visible red light. There’s a great number of free online GIS tools that allow you to instantly calculate NDVI. How is NDVI calculated? (NIR – R) / (NIR + R) In