latitude-longitude

Polygon area calculation using Latitude and Longitude generated from Cartesian space and a world file

由 柔情痞子 提交于 2019-11-26 08:36:00
问题 Given a series of GPS coordinate pairs, I need to calculate the area of a polygon (n-gon). This is relatively small (not larger than 50,000 sqft). The geocodes are created by applying an affine transform with data from a world file. I have tried to use a two step approach by doing converting the geocodes to cartesian coordinates: double xPos = (lon-lonAnchor)*( Math.toRadians( 6378137 ) )*Math.cos( latAnchor ); double yPos = (lat-latAnchor)*( Math.toRadians( 6378137 ) ); then I use a cross

Trilateration using 3 latitude and longitude points, and 3 distances

由 故事扮演 提交于 2019-11-26 08:07:21
问题 There exists an unknown target location (latitude and longitude co-ordinates). I have 3 latitude and longitude co-ordinate pairs and for each pair a distance in kilometers to the target location. How can I calculate the co-ordinates of the target location? For example, say I have the following data points 37.418436,-121.963477 0.265710701754km 37.417243,-121.961889 0.234592423446km 37.418692,-121.960194 0.0548954278262km What I\'d like is what would the guts of the function that takes that as

Calculate second point knowing the starting point and distance

由 ♀尐吖头ヾ 提交于 2019-11-26 07:59:11
问题 using a Latitude and Longitude value (Point A), I am trying to calculate another Point B, X meters away bearing 0 radians from point A. Then display the point B Latitude and Longitude values. Example (Pseudo code): PointA_Lat = x.xxxx; PointA_Lng = x.xxxx; Distance = 3; //Meters bearing = 0; //radians new_PointB = PointA-Distance; I was able to calculate the distance between two Points but what I want to find is the second point knowing the distance and bearing. Preferably in PHP or

Calculate the center point of multiple latitude/longitude coordinate pairs

由 烂漫一生 提交于 2019-11-26 06:53:33
问题 Given a set of latitude and longitude points, how can I calculate the latitude and longitude of the center point of that set (aka a point that would center a view on all points)? EDIT: Python solution I\'ve used: Convert lat/lon (must be in radians) to Cartesian coordinates for each location. X = cos(lat) * cos(lon) Y = cos(lat) * sin(lon) Z = sin(lat) Compute average x, y and z coordinates. x = (x1 + x2 + ... + xn) / n y = (y1 + y2 + ... + yn) / n z = (z1 + z2 + ... + zn) / n Convert average

Latitude Longitude Coordinates to State Code in R

由 喜欢而已 提交于 2019-11-26 06:35:49
问题 Is there a fast way to convert latitude and longitude coordinates to State codes in R? I\'ve been using the zipcode package as a look up table but it\'s too slow when I\'m querying lots of lat/long values If not in R is there any way to do this using google geocoder or any other type of fast querying service? Thanks! 回答1: Here is a function that takes a data.frame of lat-longs within the lower 48 states, and for each point, returns the state in which it is located. Most of the function simply

Java, convert lat/lon to UTM [closed]

由 家住魔仙堡 提交于 2019-11-26 06:31:09
问题 Does anyone know of a way, in Java, to convert an earth surface position from lat, lon to UTM (say in WGS84)? I\'m currently looking at Geotools but unfortunately the solution is not obvious. 回答1: No Library, No Nothing. Copy This! Using These Two Classes , You can Convert Degree(latitude/longitude) to UTM and Vice Versa! private class Deg2UTM { double Easting; double Northing; int Zone; char Letter; private Deg2UTM(double Lat,double Lon) { Zone= (int) Math.floor(Lon/6+31); if (Lat<-72)

Passing strings between activities in android

由 霸气de小男生 提交于 2019-11-26 06:07:33
问题 I have searched quite a few places but i haven\'t got up with any good solution that worked yet, and i really need help! I am making an application that needs to pass a longitude and latitude string from one activity to another. How can i do this??? Take a look at my code here: The LocationActivity.java needs to pass the string to the other activity and to another one that i didn\'t paste into here. And the string that needs to be passed is named: \"latLongString\" LocationActivity.java:

Calculating Distance between two Latitude and Longitude GeoCoordinates

由 萝らか妹 提交于 2019-11-26 06:03:08
I'm calculating the distance between two GeoCoordinates. I'm testing my app against 3-4 other apps. When I'm calculating distance, I tend to get an average of 3.3 miles for my calculation whereas other apps are getting 3.5 miles. It's a big difference for the calculation I'm trying to perform. Are there any good class libraries out there for calculating distance? I'm calculating it like this in C#: public static double Calculate(double sLatitude,double sLongitude, double eLatitude, double eLongitude) { var radiansOverDegrees = (Math.PI / 180.0); var sLatitudeRadians = sLatitude *

Get lat/long given current point, distance and bearing

由 扶醉桌前 提交于 2019-11-26 05:17:24
问题 Given an existing point in lat/long, distance in (in KM) and bearing (in degrees converted to radians), I would like to calculate the new lat/long. This site crops up over and over again, but I just can\'t get the formula to work for me. The formulas as taken the above link are: lat2 = asin(sin(lat1)*cos(d/R) + cos(lat1)*sin(d/R)*cos(θ)) lon2 = lon1 + atan2(sin(θ)*sin(d/R)*cos(lat1), cos(d/R)−sin(lat1)*sin(lat2)) The above formula is for MSExcel where- asin = arc sin() d = distance (in any

R - Finding closest neighboring point and number of neighbors within a given radius, coordinates lat-long

由 最后都变了- 提交于 2019-11-26 04:45:24
问题 I am trying to figure out how isolated certain points are within my data set. I am using two methods to determine isolation, the distance of the closest neighbor and the number of neighboring sites within a given radius. All my coordinates are in latitude and longitude This is what my data looks like: pond lat long area canopy avg.depth neighbor n.lat n.long n.distance n.area n.canopy n.depth n.avg.depth radius1500 A10 41.95928 -72.14605 1500 66 60.61538462 AA006 41.96431 -72.121 250 0 57
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