coordinate-systems

Get countries within range of LAT/LONG coordinates

由 久未见 提交于 2019-12-11 14:55:12
问题 Trouble! I'm looking for a way to find the countries within a given range of LAT/LONG coordinates. E.g.: When viewing an area in Africa using Google Maps, I get out which countries that are in my current view. This is a bit ambitious, and I think the main problem will be dealing with accuracy of the needed polygons. The accuracy of these don't need to be all that great, the borders can probably be tens of miles off, or even more. This will be needed for the entire world. 回答1: You can solve

How to find view point coordinates?

由 梦想的初衷 提交于 2019-12-11 07:42:54
问题 I have azimuth , elevation and direction vector of the sun.. i want to place a view point on sun ray direction with some distance. Can anyone describe or provide a link to a resource that will help me understand and implement the required steps? I used cartesian coordinate system to find direction vector from azimuth and elevation.and then for find viewport origin.image for this question x = distance y = distance* tan azimuth z = distance * tan elevation. i want to find that distance value...

Convert Lambert conformal conic projection to wgs84 in r

由 人走茶凉 提交于 2019-12-11 03:25:51
问题 I have Lambert conformal conic projection x,y information. I need the WGS84 coordinate. But I don't know what is lcc exactly. I have provided the lcc information below. Is there a way to convert lcc to WGS84 in r? example lcc x,y : xy <- cbind(c(509535.7, 514535.7),c(201098.6, 201098.6)) lcc information : Latitude of first standard parallel : 30.0 Latitude of second standard parallel : 60.0 Origin latitude : 38.0 Origin longitude : 126.0 Easting of computation point : 43 Northing of

Polyline offset with closed polygon and islands

由 泪湿孤枕 提交于 2019-12-11 00:42:29
问题 I have unsorted set of line segments without any binding to each other. Each line described with 2 points (x,y). I can search for lines with the same points, which means they should be connected. Every line have a thickness attribute. I need to offset each path by this thickness, and create 4 points describing the final plygon (for each line). Screenshot 1 now I need to refine it to handle corners (joins) correctly. but have no idea how to do it. Desired result: Screenshot 2 回答1: See here for

How to calculate centroid of x,y coordinates in python

由 梦想的初衷 提交于 2019-12-10 19:52:23
问题 I have got a lot of x,y coordinates which I have clustered based on the distance between them. Now I would like to calculate a centroid measure for each cluster of x,y coordinates. Is there a way to do this? My coordinates are in the format: coordinates_cluster = [[x1,x2,x3,...],[y1,y2,y3,...]] Each cluster has a minimum length of three points, and all points can have both negative and positive x and y values. I hope that someone can help me. Best, Martin (I am using python 2.7 with canopy 1

JFreeChart interactive chart editing handling ChartMouseEvent

由 感情迁移 提交于 2019-12-10 10:36:18
问题 I'm trying to intercept ChartMouseEvent in order to modify an XYSeries of a JFreeChart object created with ChartFactory.createXYLineChart method (and displayed using a JDialog). I retrieve successfully the coordinate of the mouse event this way: public void chartMouseMoved(ChartMouseEvent arg0) { int x = arg0.getTrigger().getX(); int y = arg0.getTrigger().getY(); The origin of the coordinate system (0,0) is located at the red square in the picture. Now, I would like to calculate in which

How to convert MGRS to decimal degrees

由 谁都会走 提交于 2019-12-09 07:43:32
I am making an iPhone application. I want my app to Convert MGRS co-ordinates to Decimal Degrees. How to do this Programatically ? I searched and founded : Determine the grid coordinates of a point on a military map . Here, they have given the manual process of how to determine the six-digit grid coordinates for the point on the map with a 100meter tolerance. You can go through that process and can create your Objective-C code for that. Take a look at this C++ Class : GeoCoords.cpp . Another thing I founded is : GDGeoCocoa . It is the Collection of Classes to convert co-ordinates. You can

Translating between cartesian and screen coordinates

由 谁说胖子不能爱 提交于 2019-12-08 23:05:10
问题 For my game I need functions to translate between two coordinate systems. Well it's mainly math question but what I need is the C++ code to do it and a bit of explanation how to solve my issue. Screen coordiantes: a) top left corner is 0,0 b) no minus values c) right += x (the more is x value, the more on the right is point) d) bottom +=y Cartesian 2D coordinates: a) middle point is (0, 0) b) minus values do exist c) right += x d) bottom -= y (the less is y, the more at the bottom is point) I

How to convert Tkinter canvas coordinate to window?

由 霸气de小男生 提交于 2019-12-08 19:27:03
问题 Is there a way to convert canvas coordinates to window coordinates in Tkinter? It would be the opposite of converting from window to canvas coordinate, wich is done like this: x = canvas.canvasx(event.x) 回答1: Use the canvasx and canvasy methods, giving an argument of zero, to compute the x/y of the upper left corner of the visible canvas. Then just use math to convert the canvas coordinate to something relative to the window. # upper left corner of the visible region x0 = self.canvas.canvasx

mouse coordinates for one div displayed in another div - jquery

由 佐手、 提交于 2019-12-08 13:50:48
问题 So I have 2 divs: <div class="ccc" style="position: relative; left: 100px; top: 50px; width: 200px; height: 150px; border: solid 1px;" oncontextmenu="return false;"></div> <div class="ddd" style="position: relative; left: 200px; top: 100px; width: 100px; height: 40px; border: solid 1px;" oncontextmenu="return false;"></div> http://jsfiddle.net/n8rna/ And I need the following: I need to track the mouse position / movement inside of the div with class="ccc" (coordinates should be relative to
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