Convet long/lat to pixel x/y on a given picure.

Posted by kalininew on Stack Overflow See other posts from Stack Overflow or by kalininew
Published on 2010-04-16T06:39:31Z Indexed on 2010/04/16 7:13 UTC
Read the original article Hit count: 377

Filed under:

google-maps

|

coordinates

|

pixel

|

map

I have a city "map" (for example - Moscow). She in accuracy repeats the contours the given city in google maps (that is it is copied from google maps and it is a little processed, but the sense remained the same).

alt text

Also I have object co-ordinates in a city (in co-ordinates of google).

Problem: how to translate google co-ordinates to the co-ordinates of my picture (that is in pixels on OX and OY on a picture). That is I receive google-co-ordinates and it is necessary for me to draw this point on my picture.

I know that on small scales (for example on city scales) it to make simply enough (it is necessary to learn what google-co-ordinates has one of picture corners, then to learn "price" of one pixel in google-co-ordinates on a picture on axes OX and OY separately). But on the big scales (country scale) "price" of one pixel will be not a constant, and will vary strongly enough and the method described above cannot be applied. How to solve a problem on country scales?

© Stack Overflow or respective owner

Related posts about google-maps

DirectionsDistance in google maps API v3

as seen on Stack Overflow - Search for 'Stack Overflow'
Hey, I'm trying to work out how to use this to get the distance from the successful directions: http://code.google.com/apis/maps/documentation/v3/reference.html#DirectionsDistance This is the code I have so far: var googleMaps = { // HTML Nodes fromInput: google_maps_from, toInput: google_maps_to… >>> More
Why does Internet Explorer break "pegman" display in Google Maps API v3?

as seen on Stack Overflow - Search for 'Stack Overflow'
On my site here, the SteetView control, aka "Pegman", works great under Firefox. Under IE (7 in this case, but tested on 8 as well - same result) it breaks the display of the pegman control. Here's my map code: var directionsDisplay; var directionsService = new google.maps.DirectionsService(); var… >>> More
How can I put multiple markers on Google maps with Javascript API v3?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'd like to know how to put multiple markers for Google Maps using Javascript API v3. I tried the solution posted here: http://stackoverflow.com/questions/1621991/multiple-markers-in-googe-maps-api-v3-that-link-to-different-pages-when-clicked but it does not work for me for some reason. var… >>> More
Multiple markers in Googe Maps API v3 that link to different pages when clicked

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a map with multiple markers, which I populate via an array. Each marker is clickable and should take the user to a different url per marker. The problem is that all the markers, while displaying the correct title, all use the url of the last entry in the array. Here is my code: var myOptions… >>> More
Problem to display 3D google map.

as seen on Stack Overflow - Search for 'Stack Overflow'
hello friends, I have implemented one Flex application in which I want to display 3D google map.In which I am getting the error the NUll object reference during map display. Here is my code:- import com.google.maps.controls.MapTypeControl; import adobe.utils.XMLUI; import mx.rpc… >>> More

Related posts about coordinates

Minecraft Style Chunk building problem

as seen on Game Development - Search for 'Game Development'
I'm having some problems with speed in my chunk engine. I timed it out, and in its current state it takes a total ~5 seconds per chunk to fill each face's list. I have a check to see if each face of a block is visible and if it is not visible, it skips it and moves on. I'm using a dictionary (unordered… >>> More
Matlab: convert global coordinates to figure coordinates

as seen on Stack Overflow - Search for 'Stack Overflow'
If I get coordinates via coords = get(0,'PointerLocation'); How can I convert them into points gotten via ginput? i.e, I would like to get the same values from coords = get(0,'PointerLocation'); coords=someConversion(coords); As I would have gotten by calling coords=ginput(1); And clicking… >>> More
Hexagonal Grid Coordinates To Pixel Coordinates

as seen on Stack Overflow - Search for 'Stack Overflow'
I am working with a hexagonal grid. I have chosen to use this coordinate system because it is quite elegant. This question talks about generating the coordinates themselves, and is quite useful. My issue now is in converting these coordinates to and from actual pixel coordinates. I am looking for… >>> More
Transform OpenGL coordinates to lower UIView coordinates

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am new to OpenGL over iPhone. I am developing an iPhone app similar to a barcode reader but with an extra OpenGL layer. The bottommost layer is UIImagePickerController, then I use UIView on top and draw a rectangle at certain co-ordinates on the iphone screen. So far everything is OK. Then… >>> More
Can get coordinates from iPhone simulator, but can't get coordinates from iPhone device

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi everyone, I've run into something of a mysterious bug (to me). I have some code to pick out the user's current location on the iPhone SDK. It works fine on the iPhone simulator, but when I try to run it on the actual device, I get a weird error. Here is the code (I am using ASIFormDataRequest… >>> More