QuadKey | Quad key object used for Geospatial segmentation | Map library

by buckhx Python Version: 0.0.5 License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(8)Vulnerabilities Install Support

kandi X-RAY | QuadKey Summary

QuadKey is a Python library typically used in Geo, Map applications. QuadKey has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub.

Quad key object used for Geospatial segmentation. Based off the idea of a quadtree and used as the Bing Maps tile system. Given a (lat, lon) and level produce a quadkey to be used in Bing Maps. Can also supply methods to generate a Google Maps TileXYZ. Built off of the TileSystem static class outlined here: Converts a lat,lon to pixel space to tile space to a quadkey. Not a lot of documentation here, but the implementation has quite a bit, so look at the QuadKey definitions for better documention.

Support

Quality

Security

License

Reuse

Support

QuadKey has a low active ecosystem.

It has 13 star(s) with 10 fork(s). There are no watchers for this library.

It had no major release in the last 12 months.

There are 9 open issues and 4 have been closed. On average issues are closed in 7 days. There are 2 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of QuadKey is 0.0.5

Quality

QuadKey has 0 bugs and 0 code smells.

Security

QuadKey has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

QuadKey code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

QuadKey is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

QuadKey releases are available to install and integrate.

Build file is available. You can build the component from source.

Installation instructions, examples and code snippets are available.

QuadKey saves you 130 person hours of effort in developing the same functionality from scratch.

It has 327 lines of code, 59 functions and 9 files.

It has medium code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed QuadKey and discovered the below as its top functions. This is intended to give you an instant insight into QuadKey implemented functionality, and help decide if they suit your requirements.

Generate a QuadKey from a geo coordinate
Convert geo coordinates to pixel coordinates
Convert tile coordinates to a quadkey
Clips n in the given range
Return the size of a map
Convert pixel coordinates to pixel coordinates
Convert to geo coordinates
Convert a quadkey to tile coordinates
Convert pixel coordinates to geographic coordinates
Convert tile coordinates to pixel coordinates
The area of the tile
Calculate ground resolution
Scale from latitude and resolution

Get all kandi verified functions for this library.

QuadKey Key Features

No Key Features are available at this moment for QuadKey.

QuadKey Examples and Code Snippets

No Code Snippets are available at this moment for QuadKey.

Community Discussions

Trending Discussions on QuadKey

HERE Traffic incidents integration in Leaflet.js

Understanding spanner explanation

Why Spanner performs full table scan using a underscore in a LIKE, while using % leverages the index?

Update Parameter for Web Scraping With Infinite Scroll

Query parameters in LIKE Statement causes slow response

How to implement a tile source to mapbox-gl

Is it possible in Bing Maps v8 to display a tile layer underneath the street/highway lines of an aerial map (labels on)?

Algorithm : Generate QuadKeys for different zoom

QUESTION

HERE Traffic incidents integration in Leaflet.js

Asked 2021-May-18 at 14:21

Background:

I'm currently integrating HERE maps into our web-based application. I'm trying both - HERE provided Javascript API and Leaflet at the same time to find the best approach for our use-case.

While JavaScript API provided by HERE maps is OK, rendering wise Leaflet performs much better when using raster tiles.

Issue:

It would be fine by me to use raster tiles + leaflet, but our application also needs to display traffic incidents data.

Traffic incident data is provided by HERE in JSON and XML formats (Documentation link, Example JSON). They provide [Z]/[X]/[Y], quadkey, prox, bbox, or corridor filters which can be used to retrieve filtered data set.

I've tried using [Z]/[X]/[Y] addressing with custom L.TileLayer implementation which loads appropriate JSON, converts it to GeoJSON and displays GeoJSON on map. However that approach is very inefficient and significant performance drop is visible.

Question:

Maybe anyone has already solved this issue and could share any insights on how the HERE traffic incidents could be shown on Leaflet map without encountering performance issues?

...

ANSWER

Answered 2021-Feb-08 at 17:12

I created the following script, which works without any performance issues:

Source https://stackoverflow.com/questions/66008311

QUESTION

Understanding spanner explanation

Asked 2019-Oct-23 at 21:23

I've a table of 860M rows in Google Cloud Spanner and I'm trying to understand how explanation works.

The table has a string column geoid and there is an index at this column.

When I run the following query it takes only 36ms:

...

ANSWER

Answered 2019-Oct-22 at 01:16

In the explanation, Table Scan merely means that it reads the data from a table and does not necessarily mean a full table scan. Same goes for index scan. It means that it is reading from an index. In both cases, if there is a seekable predicate (e.g., constant prefixes on primary key or indexed column), they will do the seek.

The plan used the base table, and seek-and-scanned 11 rows, otherwise you would see 860M rows returned as a result out of the Table Scan.

Is geoid the leading primary key column of the table usbg_2015? That is the only explanation that I can think of given the plan.

Source https://stackoverflow.com/questions/58494969

QUESTION

Why Spanner performs full table scan using a underscore in a LIKE, while using % leverages the index?

Asked 2019-Aug-15 at 04:32

In a query, if I use LIKE '%' on the primary key it performs well, using the index:

...

ANSWER

Answered 2019-Jul-17 at 07:34

For a prefix matching LIKE pattern (column LIKE 'xxx%'), the query optimiser internally converts the condition into STARTS_WITH(column, 'xxx'), which then uses the index.

So the reason is probably because the query optimizer is not smart enough to convert an exact length prefix matching LIKE pattern

Source https://stackoverflow.com/questions/57069857

QUESTION

Update Parameter for Web Scraping With Infinite Scroll

Asked 2019-Feb-03 at 21:05

I am unsure how I should structure my code here so that the offset parameter updates each time the function recursively calls itself. Here is more detail about my script and the challenge I'm trying to solve. I feel like there is some easy fix that I'm missing here. Scraping Website With Infinite Scroll Using Scrapy

...

ANSWER

Answered 2019-Feb-03 at 21:05

Define offset as a class attribute:

Source https://stackoverflow.com/questions/48757828

QUESTION

Query parameters in LIKE Statement causes slow response

Asked 2018-Sep-04 at 18:44

I'm trying to query Google spanner with query parameters using node.js client library. However, response is very slower with query parameter than without query parameter. Query has LIKE(forward match) statement. I couldn't find recommended way to use query parameters with LIKE statement.

Additionally, I tested with equal statement, there is no difference between query with parameter and query without parameter.

Table has more than 20 million rows. And instance is 1 node.

Is there any solution? or Is this bug with Google spanner?

Part of Schema(actually more than 40 columns):

...

ANSWER

Answered 2018-Sep-04 at 18:44

This is currently a limitation of Cloud Spanner. With a constant value for the LIKE pattern, Cloud Spanner is able to optimize the lookup expression based on the LIKE pattern during query compilation. For example, in this case, Cloud Spanner will be able to generate a query plan with a lookup expression that is basically

Source https://stackoverflow.com/questions/51629708

QUESTION

How to implement a tile source to mapbox-gl

Asked 2018-Feb-02 at 11:05

I am switching over from react-leaflet to mapbox-gl and have a question about a propriety tile service I am using for spatial data. The api has little documentation. They offer 4 different ways of requesting the tiles.

DRAW MAP TILE - PNG map tiles with a transparent background are created according to image size in pixels, a lat lon bounding box in decimal degrees, selected layer(s) and default styling. See the individual feature for a full list of style names.

DRAW STATIC MAP TILE - PNG map tiles with a transparent background are created according to image size in pixels, lat lon coordinates in decimal degrees, zoom level, selected layer(s) and default styling. See the individual feature for a full list of style names.

BING NON CACHE - PNG map tiles with a transparent background are created according to the Bing Maps API Quadkey, selected layer(s) and default styling. See the individual feature for a full list of style names.

GOOGLE NON CACHE - PNG map tiles with a transparent background are created according to the Google Maps API X, Y, and Zoom values, selected layer(s) and default styling. See the individual feature for a full list of style names.

For leaflet I used the google endpoint with the plugin "react-leaflet-google"

...

ANSWER

Answered 2017-Apr-24 at 01:05

You probably want a raster tile source. Mapbox only supports raster tiles given by x/y/z tile coordinates (not lat-longs or Bing quadkeys), so that rules out the first three options, leaving the Google NON CACHE PNG API endpoint only.

Your code will look something like:

Source https://stackoverflow.com/questions/43577919

QUESTION

Is it possible in Bing Maps v8 to display a tile layer underneath the street/highway lines of an aerial map (labels on)?

Asked 2017-Nov-09 at 18:12

The following is adapted from Bing Maps V8 interactive SDK:

...

ANSWER

Answered 2017-Nov-09 at 18:12

No, the road lines are rendered on the base map tiles on the server side with the rest of the map background. If you try different zIndex values you will find that you can put the tile layer above or below the base map tiles, but not between the road lines and the rest of the map background.

Source https://stackoverflow.com/questions/47189507

QUESTION

Algorithm : Generate QuadKeys for different zoom

Asked 2017-Jan-04 at 14:34

I want to know if there is an algorithm ready to use to generate quadkeys for different zoom.

A quadkey represents a unique picture in the globe and when we zoom in we split a quadkey into 4 other quadkeys (or pictures), and my objective is to generate all the quadkeys from the initial zoom to the target zoom, for example

Inputs :

033111010230 (this is a random quadkey with zoom 12 because it contains 12digits)

14 (this is the zoom target)

Ouputs :

033111010230 (quadkey itself zoom 12)

0331110102300 (first quadkey splited from the original quadkey)

03311101023000 (first quadkey splited from the one with zoom 13)

03311101023001

03311101023002

03311101023003

0331110102301 (second quadkey splited from the original quadkey)

03311101023010

03311101023011

...

03311101023033

I don't want you to develop this algorithm for me i just here asking if there is an algorithm ready to use, I've read this article about some quadkey key algorithms but it only talks about conversions

...

ANSWER

Answered 2017-Jan-04 at 14:34

If someone is interested about this kind of algorithm :

Source https://stackoverflow.com/questions/41464568

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install QuadKey

The package on pypi is quadtweet, so the recommended installation is with pip.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

Find more information at: