on February 12, 2023
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
on February 12, 2023
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
on February 12, 2023
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
on February 12, 2023
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
on February 12, 2023
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
on February 12, 2023
Creating landcover map from KML files
Hiking & ActivitiesHow do I import a KML file into ArcGIS? Add a KML file to your map Step 1 — Sign in to your ArcGIS account and open Map Viewer. Step 2 — In the Add Layer pane, click Your device and browse for the KML file, or drag and drop the KML onto the pane.