Without using GIS software, how can I determine how far it is from 20°01'12.07" N -75°47'53.57" W to 20°01'15.28" N -75°47'46.02" W, which are two point locations (historical battles) specified in degrees, minutes and decimal seconds?    Point A: 20:01:12.07N; 75:47:53.57W Point B: 20:01:15.28N; 75:47:46.02W
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I have coordinates in decimal degrees e.g: point A:Lat,Lng(5.317101667,-2.023303333) and point B:lat,lng(5.317093333,-2.023318333). The altitude in Meters at Point A is 11m and the altitude and Point B is 33m, How can i accurately calculate the distance between these points? Note I know about Haversine, howeve,r these points are close to each other and I want an accurate way to calculate the distance between these two, would finding the distance between the points with d=sqrt(x2-x1)^2+(y2-y1)^2+(Z2-Z1)^2, be accurate? if so what units would the answer be in? I am looking to get the answer in metres.
70836
You are given a point P(x,y) on a line of equation ax + by + c = 0. I want another point, Q(a,b) on the same line which is at a distance d from P. There will be two points. I want to find both and know which side of P each one lies.  There are related questions in this forum, but I didn't get what I am exactly looking for. Sorry for beating around the bush, and thanks for any help... Please give me an elaborate explanation. Thanks once again!!!
59214
I need to calculate possible point location based on its speed and some other factors. For example, there is a man in the middle of the forest and I need to calculate his possible location at some time periods. There are few facts about his movement:   His speed differs at certain periods of time - it can be raining, or it can be super hot - speed lowers / increases; Some objects in space - swamps, rocks - can lower his speed as well; At some time periods the man does not move at all.   So, here is the question - is there any algorithm that can calculate possible location of the man based on following parameters? The output should be a polygon for every given time_period.  {   time_periods: [{     from: 2012-12-12T20:00:00,     to: 2012-12-12T22:00:00,     speed: 5   }, {}],   objects: [{     geodata: POLYGON(...),     speed_modifier: 0.5   }, {}] }   Generated polygons will be visualized on the map afterwards.
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I need to print a map with coordinates in the format of Degree, Minute and second. CRS is set to WGS 84 (EPSG 3857) for both layers and on the project properties it is set to enable transformation on the fly. But then, when in map composer I get the following coordinates, which make no sense to me.
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It is 10 cm on the map. That is 100 km in real terms.   I am proofreading and it seems odd that the writer always uses that in these cases. I would have said this.     Who is right and who is wrong?
102992
I  have come up with the following expression to convert 5.1234   to   5° 7`24.24"   toint ($x) || '° ' || toint((($x) - toint ($x)) * 60) ||'`' || substr( (tostring(((($x) - toint ($x)) * 60) - toint((($x) - toint ($x)) * 60)) * 60),1,5) || '"'  Here’s the problem : for some  points such as 5.1234, it works. but for others,  it doesn’t.  I suspect the problem is the integer conversion which round up the decimal figures instead of truncating it.  Is there any other option? thanks.
90490
Given line AB made from two Latitude/Longitude co-ordinates, and point C, how can I calculate the position of D, which is C projected onto D.  Diagram:
111957
I've seen a number of contracts for "conduct a survey near X at Y altitude".   How do I find point X in relation to the space center? It doesn't look like the space center is marked on the planet, so how'd I even know which way to go?  I'm playing on version 1.0.
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I'm looking for a formula that will return the number of  given a specific location. I was thinking that can be calculated as a difference of sunrise and sunset, but I see that there are some other ways, like in this .  What is the best, fast and correct way to calculate this?
20953
I have an old map over a part of Laos and wondering how do I georeference the map with the help of the Grid lines and other Longitude and Latitude information on the scanned map? I have searched for information on the internet and tried many times. My scanned map wont overly correctly on the base map. Any base map would be fine. As long as I can check the result.  Do I add X/East and Y/North values from the grid line crossings as marked and written in some parts of the map? How do I begin georeferencing this map? Do I have to add zeros after the two digits? For example if the Easting is 24 (its in KM right? Do I add like three/four zeros to convert it to meters?  I georeferenced the map with the option "From Map Canvas" in the georeferencer tool and I succeeded but I want to know the coordinate of a point on my old scanned map and write them as X/East and Y/North to georeference the map.   I hope I am not babbling and someone understands what I mean!  We can set the CRS to WGS84, EPSG:4326.
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I know two latlng points and also can get distance between 2 points. But how do I can get a latlng point on 1/3 of the distance of 2 points. latlng1  = [37.7052918, -8.8420179] latlng2  = [37.7062884, -8.8425087]  var point1 = new OpenLayers.Geometry.Point(latlng1.lon, latlng1.lat); var point2 = new OpenLayers.Geometry.Point(latlng2.lon, latlng2.lat);  var line = new OpenLayers.Geometry.LineString([p1, p2]); alert(line.getGeodesicLength(new OpenLayers.Projection("EPSG:4326")));
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I often want to make some quick date calculations, such as:   What is the difference between these two dates? What is the date n weeks after this other date?   I usually open a calendar and count the days, but I think there should be a program/script that I can use to do these kinds of calculations. Any suggestions?
87179
I have location points collected from a garmin device stored in an excel sheet in Degree Minutes format --- W00208.172,N1046.977.  I am looking for an Excel formula to convert either to Decimal Degrees or Degrees Minutes seconds Format ?
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There are several algorithms to calculate distance between two latitude/longitude points.     Hubeny     But there are not so many algorithms (actually I can't finally find it) which can calculate latitude/longitude of point B from another latitude/longitude point A with bearing and distance.      I'm glad to know if there are any algorithms which is lesser accurate, but faster than Vincenty's formulae.
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I am regular user of StackOverflow, but new here.  I'm trying to guess how to do that:  Given a straight line (x1, y1, x2, y2) how can i get the point into the line (x, y) who are at an n distance from x1, y1?    I'm very bad with math, and I'm developing a 2D game. That should be forbidden!!   Thank you very much!!
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I'm working on a school project. I have  from Sacramento, California   I want to convert the XY coordinates to latitude and longitude, in order to import it into tableau and use its mapping features.   I also have the address, if that makes it easier.  I have about 10,000 records, so I need a powerful tool to perform this conversion.
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I have latitude and longitude as 19.0649070739746 and 73.1308670043945 respectively.   In this case both coordinates are 13 decimal places long, but sometimes I also get coordinates which are 6 decimal places long.   Do fewer decimal points affect accuracy, and what does every digit after the decimal place signify?