![]() Screenshot: the black line is split at the points, the section between the points is selected. Now you can select the line (or lines) between the two points and measure it's lengt using field calculator: length ($geometry) (planimetric measurement) or $length (ellipsoidal measurement). To measure the distance between two points: On your computer, open Google Maps. Use Menu Processing / Toolbox / Split with lines - as input, select your original line, for Split layer select the line layer created in step 1. Use this expression to create a new layer from the points ( see here how to do it)- it basically "extends" the points to become a line: extend( make_line( $geometry, project( $geometry, 1,0 )), 1, 0 ) You can use this, converting your points to (very small) lines that are then used to split the line. The order of the points does not matter for the formula as long as the points chosen are consistent. However, there is an algorithm for splitting lines with another line. The distance between two points on a 2D coordinate plane can be found using the following distance formula d (x2 - x1)2 + (y2 - y1)2 where (x 1, y 1) and (x 2, y 2) are the coordinates of the two points involved. At the bottom, you can find the total distance in miles (mi) and kilometers (km). The word 'Haversine' comes from the function: haversine () sin (/2) The following equation where is latitude, is longitude, R is earth’s radius (mean radius 6,371km) is how we translate the above formula. ![]() This demonstrates also the danger of using coordinates with unknown coordinate system (can happen with. The Haversine formula is perhaps the first equation to consider when understanding how to calculate distances on a sphere. ![]() To add another point, click anywhere on the map. The distance between both waypoints is more than 100m. To create a path to measure, click anywhere on the map. As far as I can see, there is still no genuine QGIS algorithm to split lines with points (but as mentioned by you can use GRASS or SAGA tools). To measure the distance between two points: On your computer, open Google Maps. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |