coordinates

How to make a matrix out of existing xyz data

由 丶灬走出姿态 提交于 2019-12-07 13:34:03
问题 I want to use matplotlib.pyplot.pcolormesh to plot a depth plot. What I have is a xyz file Three columns i.e. x(lat), y(lon), z(dep). All columns are of equal length pcolormesh require matrices as input. So using numpy.meshgrid I can transform the x and y into matrices: xx,yy = numpy.meshgrid(x_data,y_data) This works great...However, I don't know how to create Matrix of my depth (z) data... How do I create a matrix for my z_data that corresponds to my x_data and y_data matrices? 回答1:

List of coordinates between irregular points in python

由 前提是你 提交于 2019-12-07 12:23:49
问题 Imagine we have two randomly selected points between 0 and 100 for both x and y. For example: (95,7), (35,6) Now using the simple pygame.draw.line() function we could easily draw a line between these points without any gaps. My question is, how could we find a list of all the coordinates in a single pixel thick line between the two points without any gaps in the line? Secondly, is this even possible? I am using this list of pixel for the crack maze algorithm that needs to "shoot" another

Calculate overlap between two rectangles on x/y grid?

由 陌路散爱 提交于 2019-12-07 12:16:11
问题 I need to calculate the overlap (amount or yes/no) that two rectangles make on a special x/y grid. The grid is 500x500 but the sides and corners connect (are continuous). So the next point after 499 becomes 0 again. In a previous question I asked for a way to calculate the distance between two points in this grid. This turned out to be the Euclidean distance: sqrt(min(|x1 - x2|, gridwidth - |x1 - x2|)^2 + min(|y1 - y2|, gridheight - |y1-y2|)^2) What is the good mathematical way of calculating

Geocoding - Converting an address (in String form) into LatLng in GoogleMaps Java

由 人盡茶涼 提交于 2019-12-07 07:56:29
I'm a beginner programmer, took a few courses in university and therefore don't have a complete understanding of the field. I figured I'd give a shot at coding an android application with GoogleMaps API and found the need to convert a user inputted address (in String format) into Google's complementary LatLng class , or more precisely, extract latitude and longitude coordinates in order to input into the LatLng constructor (JAVA). My search online in the matter yielded little to no results as the code suggested online is complex given the question at hand is a pretty standard one. I figured

How Do I Position Custom Dialog at specific Coordinate?

由 ♀尐吖头ヾ 提交于 2019-12-07 06:54:45
问题 I'm a noob to android development and I am trying to figure out how to display the NewQuickAction3D popup dialog at a specific coordinate in a view. I am integrating the popup with this tutorial. Essentially, I want to use the popup dialog to display data where the users touch instead painting on the canvas using "infoview" Currently, the popup displays at the top&center of the view that I anchor it to. How can i make it display a particular coordinate? Any help is greatly appreciated. MY

finding pixel location of Listview item seems to return wrong value

由 夙愿已清 提交于 2019-12-07 06:44:49
问题 I have a ListView with a number of items (animals), of diverse heights. Using OnScrollListener I am trying to track which item intersects a specific location on the screen. Say the location in question is creatureMarkerBottom = 140 . The code below seems to be returning faulty data when I run the code: I keep getting false positives and false negatives. Here is the code. The code is supposed to make the marker go solid or transparent depending if a chicken is intersecting it. However, the

Normalized Device Coordinates

由 回眸只為那壹抹淺笑 提交于 2019-12-07 06:32:12
问题 I'm writing a library that deals with 2D graphical shapes. I'm just wondering why should my coordinate system range from [-1, 1] for both the x and y axis instead of [0, width] for x and [0, height] for y ? I went for the latter system because I felt it was straight forward to implement. 回答1: From Jim Blinn's A Trip Down The Graphics Pipeline , p. 138. Let's start with what might at first seem the simplest transformation: normalized device coordinates to pixel space. The transform is s_x * X

Offset LatLng by some amount of meters in Android

由 时间秒杀一切 提交于 2019-12-07 06:17:21
问题 I have a LatLng object and I want to shift it's coordinates 500 meters to the east. I couldn't find a built-in method for that. I've seen https://gis.stackexchange.com/a/2964 but my results are just too inaccurate (about 15%) to use practically. How can I make a precise shift in meters? Note: I am NOT looking for shifting a Google Maps camera, I know how to do that. I've tried: static final double KILOMETERS_PER_DEGREE = 111.111; static LatLng offsetLongitude(LatLng initialCoords, float

How do I match similar coordinates using Python?

由 懵懂的女人 提交于 2019-12-07 05:02:36
问题 Background: I have been given four catalogues of data, the first of which (let's call Cat1) gives the coordinates (in right ascension and declination, RA and Dec) for radio sources in fields 1 and 2, the second catalogue (Cat2) gives the RA and Dec for radio sources and infrared (IR) sources in field 1, the third catalogue (Cat3) gives the RA and Dec for radio and IR sources in field 2, and the fourth catalogue (Cat4) gives the RA and Dec for optical sources in fields 1 and 2. Cat1 has

Scaling around a specific point in 2d coordinate system

由 淺唱寂寞╮ 提交于 2019-12-07 04:17:09
问题 Below is an image my coordinate system: What I am trying to do is that I want to start scaling around a specific point in the canvas, the scaling works fine but my problem is that I don't know how to calculate how much to move the canvas while scaling, note that I am not using canvas.scale. I am simply increasing the distance between each 2 units in the system while scaling and it's working just fine. So is there any equation that can help me find out how much to offset the canvas while
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