latitude-longitude

问题 I am trying to identify the zip code for each set of lat/lon coordinate using a shapefile. Lat Lon data is extracted from: https://data.cityofchicago.org/Public-Safety/Crimes-2017/d62x-nvdr (Crimes_-_2001_to_present.csv) Shapefile: https://www2.census.gov/geo/tiger/PREVGENZ/zt/z500shp/ zt17_d00.shp (zip code definitions for the state of Illinois) library(rgeos) library(maptools) ccs<-read.csv("Crimes_-_2001_to_present.csv") zip.map <- readOGR("zt17_d00.shp") latlon<-ccs[,c(20,21)] str(latlon)

问题 I have a set of tiff files that display convective weather across the continental US (NAD83 projection) in pixel locations from Iowa State University. My goal is the transformation of the pixel locations to lat/lon data. I read in the tiff file data as a SpatialGridDataFrame with... imageData = readGDAL( fileNameDir, silent = TRUE ) I read somewhere that readGDAL will seek a World File if no projection data exist in the tiff file, so I created such a file (nad83WorldFile.wld) with the

问题 I am looking to make an option of my serach engine on my site so that users can search for items within a set distance, e.g. search items within 10 miles, or 20 miles etc. I was wondering how this could be done? The user would have to enter thier postcode, while i also have the postcode of the item's location and once they hit search there needs to be a away to work the distance between the two locations in miles and then display the results in order by distance; as in the closest item is the

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I need some type of PHP thingie so that I can input a few street-addresses (such as: 123 Fake Street, Faketown, FA, 98765) and then it will give me the coordinates (latitude and longitude) of these addresses. I need this to be completely dynamic (as I will be fetching these addresses from a DataBase). Where can

问题 I have a GPS on the middle of a plate as can be seen in attached picture. Clearly, the GPS gives me the Lon. and Lat of the center of the plate with no problem. My question is how can I estimate what is the Lon. and Lat at each end point (A,B,C,D) as the distance between end points and GPS is known? I believe there should be a formula for this purpose. I appreciate any idea and suggestion in advance. GPS and four points around it: ![][1] [1]: https://i.stack.imgur.com/cwWVU.jpg 回答1: Have a

问题 I have looked through many forum posts and have not found an answer. I have a large list of latitudes and longitudes and would like to make a grid of them and based on that grid have each pair of lat/longs be assigned a cell reference from that grid. Eventually I want to assign values based on the cell reference. E.g. Lat 39.5645 and long -122.4654 fall into grid cell reference 1, the total number of murders in that cell are 16 and assaults are 21. There is a better way to do this but this is

问题 This question already has answers here : get latitude and longitude with geocoder and android Google Maps API v2 (5 answers) Closed 4 years ago . I am trying to get an address from latitude and longitude in Android Google Maps v2, but it errors. Here is my code: case PLACES_DETAILS : final HashMap<String, String> hm = result.get(0); final double latitude = Double.parseDouble(hm.get("lat")); final double longitude = Double.parseDouble(hm.get("lng")); SupportMapFragment fm = (SupportMapFragment

问题 I have latitude and longitude of a point.I have to find out the latitude and longitude of another point from a relative distance from the known point.For example point A has some location with latitude and longitude.What is the latitude and longitude after moving 1000m south and 500m west from point A.Is there any direct equation to find this? Thanks in advance 回答1: Instead of looking up an equation you can calculate as follows. Let R be the radius of the Earth. Let a be the current latitude

问题 I'm trying to plot the latitude and longitude, but I'm getting an error message. The code I'm using is the following tweets <- searchTwitter('weather', n=1000,lang='en') t <- twListToDF(tweets) lat <- t[, c("latitude")] lon <- t[, c("longitude")] l.df <- data.frame(lat,lon) l.na <- l.df[!is.na(l.df)] require(ggplot2) ggplot(l.na, aes(x=lon, y=lat,)) + geom_point(size=1.9, alpha=.02) The error message is the following: Error: ggplot2 doesn't know how to deal with data of class character The

问题 I was following an earlier question (Located here: Get Latitude and Longitude from SQLite database for use in Android MapOverlay) I understand the code there and my database has a similar layout in that it has 4 columns; id, name, lat and lng. I even want to do what is said there in that it selects all from that table and places the lat long as points in an overlay. My problem is the answer requires some pre requisites so I was just wondering if anyone could give me some help in what is