Find all the plus codes within an area of the map

[himans...@urbanclap.com]

Hi,

I have created some areas on google maps with the maps editor - I want to find the plus codes that are within this area. Is there a quick way to do it?

Thanks,

Himanshu

[Barry Hunter]

Plus codes of what?

A plus code is a representation of a coordinate, or point. In a given area there are effectively infinite points. Although depending on precision of quoting location there can be less effective 'usable points'. Eg in lat/long if quote locations to 6 decimal places, then there are only a certain number of points at that precision. 

Same with Plus codes. For example may quote codes as 10 digit, which means lots of the points have the same plus code. Another way of thinking of it a given plus code presents an area (roughly rectangular) 

... so you could be looking for all the unique plus codes that intersect the 'drawn' area. ie the rectangles overlap your area. 

... or could be thinking of areas 'wholly enclosed' by. ie plus codes wholey within the area, no part of the rectangle outside it. 

Or maybe are you thinking of just plus-codes that represent specific features within the area? ie you have a list of addresses. First find which of the addresses are in the area (Eg using lat/long coordinate), then can just compute the plus codes for those matching. 

... the exact algorithm, will depend on what trying to get. 

 

 

[Himanshu Arora]

Thanks a lot Barry! 

Apologies, I did not clarify too well initially. It is closed to the first comment you made.

I have an area carved out like below.

I want to see what all 8 digit plus code grids lie within this area. There are infinite location points but only a finite number of 8 digit plus code grids possible within this area (that are completely within this area).

Thanks a lot,

Himanshu

--

Himanshu Arora AVP - Business Development M: +91 958201 3353

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[Barry Hunter]

Hmm, ok, so yes, you are basically wanting the 'grid' of codes that intersert the area. 

If you dont need them in 'list' form, then could perhaps add the plus-code grid to your map

https://grid.plus.codes/

But actually the grid service, basically just plots all the plus codes in the area. Which is very close to what you want to do. 

So you perhaps could 'abuse' the grid service for your list. The above page, has details of making a 'manual' request. 

It seems it can only get the codes withing a rectangular area defined by a BBOX. So could compute the BBOX of your drawn area, make a request from the API, then check which of the returned plus codes are in the area. 

Lots of algorithms for that. 

https://www.google.com/search?q=point+in+polygon

The Maps API also have a containsLocation which would do it

https://developers.google.com/maps/documentation/javascript/reference/geometry#poly

[Andreas B]

I'm not sure why my previous message here has been deleted. Any info about that?

[Rasťo Šrámek]

Andreas: for some reason the last one was marked as spam and I had to manually approved it. Hopefully the filter learned from that. Very sorry about that!

On Fri, 25 Jan 2019, 09:32 Andreas B <and...@bocops.de wrote:

Himanshu Arora,

I haven't done much with it lately, but this might be of help to you. Basically, starting from a list of coordinates (which will be interpreted as vertices of a well-formed polygon - no error checking yet), you can output a list of plus codes that correspond to the polygon's area, in any precision you like:

https://github.com/bocops/open-geotiling/blob/tile-area/java/org/bocops/opengeotiling/TileAreaPolygonalBuilder.java

This is currently just available in a branch because I haven't found time to test for all sorts of bugs. It should be mostly OK, though.

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Github project: https://github.com/google/open-location-code
Demo site: http://plus.codes/
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[Doug Rinckes]

Hi - sorry - but there's an error on the documentation page, but thanks for helping find it!

The URL should be (using 'kml' instead of 'grid'):

https://grid.plus.codes/kml?BBOX=-49.108361,-28.647304,-49.106151,-28.645176

I'll update the documentation now, apologies again.

Ngā mihi,

Doug Rinckes, Technical Program Manager, Google Switzerland GmbH; 9G8F+6W Zürich

On Fri, 5 Apr 2019 at 06:03, <he...@instinctive.io> wrote:

Doesn't seem like the BBOX endpoint works properly. I keep getting a bad tile request error when trying this:

https://grid.plus.codes/grid?BBOX=-49.108361,-28.647304,-49.106151,-28.645176

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Github project: https://github.com/google/open-location-code
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[Andrey Panin]

On Friday, January 18, 2019 at 10:35:48 PM UTC+7, Barry Hunter wrote:

A plus code is a representation of a coordinate, or point. In a given area there are effectively infinite points.

This is not so. The specification explicitly tells that it is the representation of an area, not a point.