point

I am working with a huge area, 7 states of forest and nonforest using the NLCD data. Within some of the forested areas is a plot (this is my master's thesis I am working on). I have stumped everyone I have asked with this large dataset but we are certain there is a resolution out there. The forest/nonforest area is a signed and discrete raster. I was able to make the forested area into polygons by subsetting out the forested area. I am not able to make the nonforest area into polygons (too large). So I was trying to get point distance (the point is within the polygon) to the edge of the

I am trying to rotate a 2D Point in java around another with a specified degree value, in this case simply around Point (0, 0) at 90 degrees. Method: public void rotateAround(Point center, double angle) { x = center.x + (Math.cos(Math.toRadians(angle)) * (x - center.x) - Math.sin(Math.toRadians(angle)) * (y - center.y)); y = center.y + (Math.sin(Math.toRadians(angle)) * (x - center.x) + Math.cos(Math.toRadians(angle)) * (y - center.y)); } Expected for (3, 0): X = 0, Y = -3 Returned for (3, 0): X = 1.8369701987210297E-16, Y = 1.8369701987210297E-16 Expected for (0, -10): X = -10, Y = 0 Returned

I want to test if there is a square in a list of Point object or not. This is my Point class : class Point { private int x; private int y; public Point(int x, int y) { this.x = x; this.y = y; } public int getX() { return x; } public void setX(int x) { this.x = x; } public int getY() { return y; } public void setY(int y) { this.y = y; } public int distanceSquare(Point q) { return (x - q.getX()) * (x - q.getX()) + (y - q.getY()) * (y - q.getY()); } } I can test if four Point is a Square or not : static boolean isSquare(Point p1, Point p2, Point p3, Point p4) { int d2 = p1.distanceSquare(p2); //

I have a two dimensional euclidean space. Three points are given. For example (p2 is the middle point): Point2D p1 = new Point2D.Double(177, 289); Point2D p2 = new Point2D.Double(178, 290); Point2D p3 = new Point2D.Double(178, 291); Now i want to calculate the curvature for these three points. double curvature = calculateCurvature(p1, p2, p3); How to do this? Ist there a existing method (no java external libraries)? Curvature: https://en.wikipedia.org/wiki/Curvature Menger Curvature: https://en.wikipedia.org/wiki/Menger_curvature For the Menger Curvature, the formula is right there in the

I'm new to OpenCV and Android. I'm tring to covert a C++ code to java line( img_matches, scene_corners[0] + Point2f( img_object.cols, 0), scene_corners[1] + Point2f( img_object.cols, 0), Scalar(0, 255, 0), 4 ); this is the last part of it. Here, I replaced line with Core.line() But now problem is adding these 2 points in the above code. scene_corners[0] + Point2f( img_object.cols, 0) I replaced ( scene_corners[0],Point2f( img_object.cols, 0) ) with scene_corners.get(0),new Point(img_object.cols(),0) Since both are org.opencv.core.Point type objects, these types of operations are not supported.

I'm trying to plot just one point in any coordinate system: Cartesian, cylindrical or spherical. I tried plot3(1,1,1) with many values but just shows a tiny point in the same location for all values! I tried surf(X,Y,Z) as well but matlab said: Z must be a matrix, not a scalar or vector. bla How about this? plot3(1,1,1,'.'); grid on You did try it, but then again, that is exactly what it does! Something like scatter3(x,y,z1,720,'g','fill') will make opaque green spheres of 720 size around all the points listed in the vectors x,y,z1. 来源： https://stackoverflow.com/questions/13748633/plot-a-3d