distance

I am looking for the fastest available algorithm for distance transform. According to this site http://homepages.inf.ed.ac.uk/rbf/HIPR2/distance.htm , it describes: "The distance transform can be calculated much more efficiently using clever algorithms in only two passes (e.g. Rosenfeld and Pfaltz 1968)." Searching around, I found: "Rosenfeld, A and Pfaltz, J L. 1968. Distance Functions on Digital Pictures. Pattern Recognition, 1, 33-61." But I believe we should have a better and faster algorithm than the one in 1968 already? In fact, I could not find the source from 1968, so any help is

Using JavaScript in the browser, how can I determine the distance from my current location to another location for which I have the latitude and longitude? Frank van Puffelen If your code runs in a browser, you can use the HTML5 geolocation API: window.navigator.geolocation.getCurrentPosition(function(pos) { console.log(pos); var lat = pos.coords.latitude; var lon = pos.coords.longitude; }) Once you know the current position and the position of your "target", you can calculate the distance between them in the way documented in this question: Calculate distance between two latitude-longitude

I am developing a demo for my app, in which there are two buttons named as "START" and "STOP". When user taps on "START" he will start walking. What I want to do is make it so that when users tap "STOP" then the demo will calculate his distance between "START" and "STOP". If the user pressed "START" and pressed "STOP" without taking a single step, then it must show 0km or 0m. I don't have any idea how I should start this; please make a suggestion. One way to go about it is using the accelerometer data. Your app should continuously record the accelerometer data after the user presses the Start

This question already has an answer here: Geographic / geospatial distance between 2 lists of lat/lon points (coordinates) 2 answers Calculate distance between two latitude-longitude points? (Haversine formula) 36 answers I have geocoded points in long, lat format, and I want to calculate the distance between them using R. This seems pretty straight forward, yet I can't find a function that will do it easily. I've been attempting to do it with the gdistance package, but it seems very convoluted and oriented to graphing, I just need a number. Something like distanceBetween(pointA,pointB) that

Using a force-directed layout in d3, how do I make the link distance a priority, while still keeping a nice graph layout? If I specify dynamic link distances, but keep the default charge, my graph distances are morphed a bit by the charge function, and are no longer accurate distances: However, if I remove the charge, the graph looks like this: Any advice appreciated! If I understand correctly, I believe there is a potential solution. To get link distance to be accurate, you need to set charge and collision forces to zero, but as your image suggests, then nodes aren't spaced in a way that

I have a region with about 144 points. What i want to achieve is to measure the distance of a point with all others and store it in an array. I want to do this for all the points. If possible i would like to store this data in such a manner that there in no repetition. And i should be able to make queries like- All the distances between all the points without repetition, sum of all the distances for point no56 etc. I have a 3*144 array with two columns storing the coordinates of the points. A possible solution (I am not really clear with what you mean by no repetition, though): X are your