I don't know if anyone have noticed this, when requesting from Bing maps REST service for some locations, or if the query was not well formed, the response from Bing maps gives the coordinates of Lancaster, Lancashire, as if it was defaulting to this location...
try this request and check the coordinates, it should yield the coordinates of "Bethnal Green, London - East", instead it is "Lancaster, Lancashire":
http://dev.virtualearth.net/REST/v1/Locations?locality=Bethnal+Green+&adminDistrict=%22London+-+East%22&countryRegion=UK&o=xml&key=BING_MAPS_KEY
Any info about this and how to stop it is appreciated.
What is happening is that the geocoder isn't understanding your lower level address information so it moves up through the address until it finds something. In this case it is returning a coordinate for the center of the UK. This just happens to be near Lancaster, Lancashire. If you look at the Name or address property of the result you will be able to see this pretty clearly. Also, since you are working with the REST services take a look at these tips and tricks: http://www.bing.com/blogs/site_blogs/b/maps/archive/2013/02/14/bing-maps-rest-service-tips-amp-tricks.aspx
Related
I receive a steam of GPS locations representing a vehicle, and I want to show it as an annotation on the map. Showing the annotation is fine.
Whenever I receive a new GPS location, I update the symbol with:
vehicleSymbol.setLatLng(newLatLng);
symbolManager.update(vehicleSymbol);
However, the symbol "blinks", apparently mostly when I zoom in. This can be seen on the following video: https://streamable.com/zqhxo
Am I doing something wrong? Is there a maximum rate at which I can update the symbol?
Setting setIconAllowOverlap to true did it:
symbolManager.setIconAllowOverlap(true);
I am using google api V3 in my iOS App,
I requested to google api direction service, by http GET method, I got a very large json response, I got many alternate routes from origin to destination, now I want to show the route of each alternative on map, how should I done this ? is there any need to integrate google sdk in iOS, or can i use webView only, please help me, and suggest the simplest way.
Thanks in advance
you do not need to include any google SDK to draw the route over map. Look at the following classes.
MKPolyline
MKPolyLineview
The google map api Direction service will give you the legs(coordinates) to draw the route between two specific points.
As you already have the json response from the Direction api now you have to parse the json and get all the legs point from the json to create Coordinate array.
Jsonkit for parsing
These points may be or mostly encripted. How to decode the Google Directions API polylines field into lat long points in objective-C for iPhone?
If you have the coordinates array then first you have to create a CLLocationCoordinate2D array like following:
CLLocationCoordinate2D *pointArr = malloc(sizeof(CLLocationCoordinate2D) * [your_CoordinateArray count]);
for(int i = 0; i < [your_CoordinateArray count]; i++){
pointArr[i] = [your_CoordinateArray objectAtIndex:i];
}
Then you have to add the polyline to your map
MKPolyline *line = [MKPolyline polylineWithCoordinates:pointArr count:[your_CoordinateArray count]];
if (nil != line)
{
[your_Map addOverlay:line];
}
Then you have to implement the following map delegate:
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
MKOverlayView* overlayView = nil;
lineView = [[MKPolylineView alloc] initWithPolyline:overlay];// lineView is an ivar, object of MKPolylineView
lineView.fillColor = [UIColor greenColor];
lineView.strokeColor = [UIColor greenColor];
lineView.lineWidth = 10.0;
lineView.alpha = 0.9;
overlayView = lineView;
return overlayView;
}
Now, if you want to show two different routes between two points then you have to create two different array of coordinates and apply the above method for both Arrays
Hope this will help you.
There is no need per say to integrate google sdk and you can simply use webView since I believe the webView gives you alternative views, but the user interface is much cleaner in the SDK than online. But at this moment, I don't believe the SDK allows other apps to show the alternative routes from what I've used of the new SDK. The code in maps.google.com is now considerably different from that in
the API and has access to different services. In particular, it has a large external module, mod_suggest.js, that doesn't exist in the API. But you may be able to implement it by
1) Throw the request at maps.google.com, and let it do the suggestions,
i.e. open a new browser window and pass it something like
http://www.google.com/maps?f=d&source=s_d&saddr=Jurong+West,+Singapore&da
ddr=Ang+Mo+Kio,+Singapore&hl=en
2) Just display the normal route and the avoid highways route.
3) Try to guess sensible waypoints to add in the middle of he route that
might lead to reasonable alternatives. That's not easy unless you have a
database of highways or highway intersections, and can look for such an
intersection that's somewhere between your start and end points (for
some approximate value of "between").
There may be problems using lat/lng coordinates for the waypoints,
particularly if there's a dual carriageway involved. If the coordinates
are for a point on the wrong carriageway, GDirections will drive a
considerable distance out of your way so that you visit the wrong side
of the road. But even using street names you may well get strange kinks
near the waypoints, like this:
from: Jurong West, Singapore to: Ayer Rajah Expy singapore to: Ang Mo
Kio, Singapore
Perhaps the only way to really deal with that is to include points on
both sides of a dual carriageway, and well clear of roads that cross
underneath or overhead, and then try to filter out the ones that are
silly.
Consider these examples
from: Jurong West, Singapore to: 1.32558,103.740764 to: Ang Mo Kio,
Singapore
from: Jurong West, Singapore to: 1.32582,103.740764 to: Ang Mo Kio,
Singapore
One of those adds 7 minutes to the trip by a complicated excursion to
visit the wrong side of the road.
Writing code to filter out silly routes isn't easy. As a first
approximation, you could discard routes that have estimated times that
are more than, say, 10% longer than the initial route. And you can also
compare the durations for pairs of points on opposite sides of a dual
carriageway and always discard the slower one.
Writing code to discard duplicate routes isn't easy either. For example,
a point on Bukit Timah Expy or Kranji Expy might create a route that's a
duplicate of Google's Seletar Expy suggestion.
You might want to look at: http://www.geocodezip.com/example_geo2.asp?waypts=yes&addr1=Jurong+West,+Singapore&addr2=Ang+Mo+Kio,+Singapore&waypt=Ayer+Rajah+Expy+singapore&geocode=1&geocode=2
But that may not be a legal implementation since the API does not allow it. Hope this helps.
I am attempting to modify our app from using MKReverseGeocoder to CLGeocoder for devices running iOS 5, but I'm getting different results from the two classes. Specifically, when doing a reverse geocode with this coordinate:
(47.643126, -122.204037)
I get this from MKReverseGeocoder:
10210 NE Points Dr
Kirkland, Washington 98033
but I get this from CLGeocoder:
9601-10267 NE Points Dr
Kirkland, Washington 98033
The second value is much less specific than the first and therefore much less useful. The solution for now is to just use MKReverseGeocoder, but at some point we'll be forced to switch.
Q: Any idea how to improve the results from CLGeocoder?
Thanks,
David
update their database. In short their data is less specific/accurate so there is nothing you can do apart from accept their less accurate data
I have this Information which i get when i hit google Direction api. I know how to parse it. But i don't know how to use this information to draw polyline between two places. Please give me any of your idea.
<DirectionsResponse>
<status>OK</status>
<route>
<summary>I-40 W</summary>
<leg>
<step>
<travel_mode>DRIVING</travel_mode>
<start_location>
<lat>41.8507300</lat>
<lng>-87.6512600</lng>
</start_location>
<end_location>
<lat>41.8525800</lat>
<lng>-87.6514100</lng>
</end_location>
<polyline>
<points>a~l~Fjk~uOwHJy#P</points>
<levels>B?B</levels>
</polyline>
<duration>
<value>19</value>
<text>1 min</text>
</duration>
<html_instructions>Head <b>north</b> on <b>S Morgan St</b> toward <b>W Cermak Rd</b></html_instructions>
<distance>
<value>207</value>
<text>0.1 mi</text>
</distance>
</step>
...
... additional steps of this leg
...
... additional legs of this route
<duration>
<value>74384</value>
<text>20 hours 40 mins</text>
</duration>
<distance>
<value>2137146</value>
<text>1,328 mi</text>
</distance>
<start_location>
<lat>35.4675602</lat>
<lng>-97.5164276</lng>
</start_location>
<end_location>
<lat>34.0522342</lat>
<lng>-118.2436849</lng>
</end_location>
<start_address>Oklahoma City, OK, USA</start_address>
<end_address>Los Angeles, CA, USA</end_address>
<copyrights>Map data ©2010 Google, Sanborn</copyrights>
<overview_polyline>
<points>a~l~Fjk~uOnzh#vlbBtc~#tsE`vnApw{A`dw#~w\|tNtqf#l{Yd_Fblh#rxo#b}#xxSfytAblk#xxaBeJxlcBb~t#zbh#jc|Bx}C`rv#rw|#rlhA~dVzeo#vrSnc}Axf]fjz#xfFbw~#dz{A~d{A|zOxbrBbdUvpo#`cFp~xBc`Hk#nurDznmFfwMbwz#bbl#lq~#loPpxq#bw_#v|{CbtY~jGqeMb{iF|n\~mbDzeVh_Wr|Efc\x`Ij{kE}mAb~uF{cNd}xBjp]fulBiwJpgg#|kHntyArpb#bijCk_Kv~eGyqTj_|#`uV`k|DcsNdwxAott#r}q#_gc#nu`CnvHx`k#dse#j|p#zpiAp|gEicy#`omFvaErfo#igQxnlApqGze~AsyRzrjAb__#ftyB}pIlo_BflmA~yQftNboWzoAlzp#mz`#|}_#fda#jakEitAn{fB_a]lexClshBtmqAdmY_hLxiZd~XtaBndgC</points>
<levels>BBBAAAAABAABAAAAAABBAAABBAAAABBAAABABAAABABBAABAABAAAABABABABBABAABB</levels>
</overview_polyline>
<optimized_waypoint_index>0</optimized_waypoint_index>
<optimized_waypoint_index>1</optimized_waypoint_index>
<bounds>
<southwest>
<lat>34.0523600</lat>
<lng>-118.2435600</lng>
</southwest>
<northeast>
<lat>41.8781100</lat>
<lng>-87.6297900</lng>
</northeast>
</bounds>
</route>
</DirectionsResponse>
Assuming you're on iOS 4, you'd use an MKMapView and an MKOverlay. The MKOverlay allows you to specify a bounding box for the thing you're trying to draw on the map; as and when the graphic is required your MKMapViewDelegate will be asked to supply an MKOverlayView to draw the actual content. Drawing a polyline is particularly easy because you can pass back an instance of the built-in MKOverlayPathView.
Rather than me trying to come up with example code, the easiest thing to do is to look at Apple's KMLViewer example (the KML aspect of which is pretty easy to read past).
Anyone know how to get thew Google Maps API HTTP request/response to only return me Locations that fall within Australia ?
I thought I could just add:
bounds=lat, long | lat Long
Creating a square boundary based off Coordinates, but Google for some strange reason isn't liking it.
[NSString stringWithFormat:#"%#%#+Australia&bounds=-9.102097,104.765625|-44.902578,159.697266&sensor=false®ion=au", kGoogleGeocodeURL, params];
Problem resolved, it turns out that the search string was correct, but I needed to use UTF8Encoding, as NSString didn't like the Commas.