polygon

问题 I use to plot maps of Belgium available on GADM (select Belgium) using R. I import and plot the outside boundary of Belgium using : belgium <-readRDS("gadm36_BEL_0_sp.rds") plot(belgium) Which gives me : I import and plot the boundaries of provinces of Belgium using : provinces <-readRDS("gadm36_BEL_2_sp.rds") plot(provinces) Which gives me : What i'm trying to have is a dataframe with boundaries of provinces that are NOT outside boundaries of Belgium : I tried using over() , intersect() ,

问题 I was looking for a geographical library for python. I need to be able to do the following: Get the distance between 2 points (in meters) using Great-circle distance (not liner distance calculation) Check if a point is inside a polygon Perform 1 and 2 couple of thousands times per seconds At start I've looked at this post: Python module for storing and querying geographical coordinates and started to use geopy. I've encountered 2 problems: Geopy doesn't support polygons High CPU usage of

问题 I was looking for a geographical library for python. I need to be able to do the following: Get the distance between 2 points (in meters) using Great-circle distance (not liner distance calculation) Check if a point is inside a polygon Perform 1 and 2 couple of thousands times per seconds At start I've looked at this post: Python module for storing and querying geographical coordinates and started to use geopy. I've encountered 2 problems: Geopy doesn't support polygons High CPU usage of

问题 I am using polygons on map and I want to have a text on them. Is there any possible way to do this? I tried to put simple text on map point but didn't make it. private void addPolygon(Region reg) { PolylineOptions polylineOptions = new PolylineOptions(); ArrayList<LatLng> coordList=reg.getAllPoints(); coordList.add(coordList.get(0)); int regColor = reg.getColor(); String regName = reg.getName(); //want to put a name on region polylineOptions.addAll(coordList); polylineOptions .width(5) .color

问题 I am using polygons on map and I want to have a text on them. Is there any possible way to do this? I tried to put simple text on map point but didn't make it. private void addPolygon(Region reg) { PolylineOptions polylineOptions = new PolylineOptions(); ArrayList<LatLng> coordList=reg.getAllPoints(); coordList.add(coordList.get(0)); int regColor = reg.getColor(); String regName = reg.getName(); //want to put a name on region polylineOptions.addAll(coordList); polylineOptions .width(5) .color

问题 I'm working on mesh slicing utility for 3d printing purposes. In general it should slice a 3d mesh model into 2d shapes (a number of polygons, probably with holes) and fill them with paths of determined thickness using a specific pattern. These paths will be used to generate a gcode commands for a 3d printer firmware. There are various open source tools with same purposes, written on python and perl. But my goal is to understand the workflow of slicer and to write my own tool in C or C++. So

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . Improve this question I'm looking for a Java library that is capable of performing spatial calculations on sets of lat/lon data. Here are some of the functions that I'm looking for: Calculate the Great Circle distance between two points Determine if a point lies within a simple closed

问题 I am trying to create N random pairs of points (N = 50) of a given distances, inside a 500 meters hexagon. The distance D created by using (dmax - dmin).*rand(N,1) + dmin , with dmin = 10 and dmax = 100 in Matlab. I understant that the first I have to generate a set of points ([x1 y1]) that have at least distance D from the main hexagon border, then generate the second set of points ([x2 y2]) that have exact distance D from the first set. But sometime I got the problem with the second point

问题 I have two polygon layers. I want to run st_intersection on them, to give the result of the areas where they overlap as a new layer. The new layer should contain the attributes from both input layers. I found this image which seems to illustrate my desired end results. My two input layers are both polygons: SELECT st_geometrytype(geom), COUNT(*) FROM a GROUP BY st_geometrytype(geom) -- Result is 1368 st_polygons SELECT st_geometrytype(geom), COUNT(*) FROM b GROUP BY st_geometrytype(geom) --

问题 I'm trying to draw a filled polygon using individual pixels in a scanline loop (so no lineTo or fill Canvas methods). I was able to achieve a triangle in this method (example below), but I'm not sure where to begin with a more complex polygon (such as a star shape ★). Can anyone give any advice on how to approach this or existing shape algorithm examples for Javascript & Canvas? I have researched Bresenham’s Algorithm but was unsuccessful implementing it for polygons because of my limited