Graph hopper maps distance matrix. java -Xmx4g -jar graphhopper-web-[version]. Graph hopper maps distance matrix

 
 java -Xmx4g -jar graphhopper-web-[version]Graph hopper maps distance matrix here I think you should look at the full response to understand how Google API provides the requested query

Place Name,Latitude,Longitude. Ashwin February 5, 2019, 1:16pm Plan routes and get driving directions from GraphHopper Maps using open source and open data 6. For example, in the table below we can see a distance of 16 between A and B, of 47 between A and C, and so on. But we do not stop there, we also offer a time-, weight- and route-matrix. Thus, we received expensive bills from Google Cloud following the number of requests. Make sure it is not a different problem and you use the POST request, very important for a matrix of this size also as the request could be gzipped. a dedicated in-house data team, TravelTime offers a. Or a delivery service in the need of often big NxN matrices to solve vehicle routing problems. In this case the sta from_point = [] # str | The starting points for the routes. Inspired by geopy and its great community of contributors, routingpy enables easy and consistent access to third-party spatial webservices to request route directions, isochrones or time-distance matrices. maps. . NextBillion. See Libraries in the Maps JavaScript API. To run the map-matching functionality in 3. geometry. 62 miles (1 km) when using the distance matrix API. clean data or attach certain data to it like turn instructions for biking trials. A-to-B routing with turn-by-turn instructions. answered 26 Mar '15,. Examples of two-diameter graphs include bipartite. spherical. HERE). 400 c/m for the standard package and 100 c/m for the basic package. To create a Cloud project with billing enabled: Console gcloud. Others had many issues. The calculations can then be displayed as a list of. questions tags users badges unanswered ask a question. Please consider the billing structure before using the service. Plan routes and get driving directions from GraphHopper Maps using open source and open data Open Source Routing Engine. All hubs know the distance to each other. 'GraphHopper' <GraphHopper is a fast and memory efficient open source routing library and server written in Java. 0. Besides the route calculations the GraphHopper engine offers a lot more features like the map matching (“snap to road”), the navigation and the isochrone calculation (for a point it finds all reachable roads within a specified time). It allows you to setup all GoogleMaps Trave parameters, like transport method or departure time. Ignoring these errors in the data can lead to false analyses and misleading conclusions. This type of API is useful for applications that need to display distance-related data on a map, such as a fitness tracker or a travel app. Choose from a variety of profiles and set up to 50 waypoints to plan your route. E. ; Location coordinates. 0 React JS Google Maps Distance Matrix Error: Uncaught TypeError: locations. E. Using publicly available map data from OpenStreetMap it can calculate the optimal route for a given source-target pair for many different vehicles and flexible. distance and paths[0]. 162 Phoenix 2. Google Maps Distance Matrix For AppInventor & Makeroid Apps Description This script will allow you to get the travel distance between two points using Google Maps Matrix Distance API. GraphDistanceMatrix is also known as the shortest path matrix. 2. Which Minkowski p-norm to use. 3KM, others: 37. Lightweight Node. For example our Route Optimization API needs all distances between 30 deliveries, so this Matrix API is requested and returns 870 distances (30*30-30) calculated within just. In terms of accuracy, there will always be some slight deviation from it. ) ? 2 - is there any parameter that will output the url into xml or any other file with 1 hour 9 min 110. Access the GraphHopper Directions API with a plan that suits you. I wish to visualize this distance matrix as a 2D graph. thanks for your answer,I managed to build distance and time matrix :) I have a question about values returned from res. The determinant is given by Det(D) = (−1) n−1 (n− 1)2 nâˆ. No guarantees are made for the free package. Smaller edge distances denote stronger interactions. 162 2. Graphhopper (github is an “open source routing engine”. The GraphHopper Directions API is an offering of the GraphHopper GmbH and includes a Geocoding API, a Distance Matrix API, a Map Matching API, an Isochrone API and a Route Optimization API besides the Routing API Map Matching – converts your GPS tracks to street-align routes. Each query sent to the Distance Matrix API is limited by the number of allowed elements, where the number of origins times the number of destinations defines the number of elements. I am trying to get distance between below origin and destination using Google distance matrix url but i am getting distance as 9. A new version of the cartography package (v2. A distance matrix of this “small” size should not take this long. I'm talking specifically about the quota of type elements per minute per user. pbf files on a daily basis. e. Nevertheless, it has a low latency of the response. Route Optimization API, The Route Optimization API provides everything you need to solve a variety of vehicle routing problems, including the classical “traveling salesman problem”. Matrix of N vectors in K dimensions. The Google Maps Distance Matrix API has the following limits in place: Standard Usage Limits Users of the standard API: 2,500 free elements per day; 100 elements per query; 100 elements per 10 seconds; When you were submitting a matrix of dimensions 33 x 3 you only had 99 elements, which was within the limit for the free tier of. If there are N. 6. These salesorders contain timewindows. g. And with a dedicated in-house data team. The only counterpart from the user is to properly display an attribution text on the maps. A direction matrix API, such as Google Maps Directions API, provides turn-by-turn directions between two or more points. 0 Released. response. The Bing Maps Distance Matrix API provides travel time and distances for a set of origins and destinations. (6. Due to its Apache License it is a business friendly alternative to existing routing engines. here I think you should look at the full response to understand how Google API provides the requested query. In terms of accuracy, API is very close to Google Distance Matrix API. –mp_map: Get static map from the Maps Static API; mp_matrix: Get distance matrix from the Google Maps Distance Matrix API; plot. All maps available through maptiles are offered freely by various providers. 🌎 Python library to access all public routing, isochrones and matrix APIs in a consistent manner. Get travel time between two addresses using The Google Maps Distance Matrix API. E. We use Graphhopper to get the routes between the jobs and workers to determine costs. login about faq. (See [91]. Feel free to contact us via Email and send me the request or the time you sent it. rows [i]. For example our. Traffic information is used when all the following apply (these are the conditions required to receive the duration_in_traffic field in the Distance Matrix response): The travel mode parameter is driving, or is not specified (driving is the default travel mode). 251953', '47. Once you got the GPS coordinates of all your locations you can calculate the distances using the Matrix API: Documentation - GraphHopper Directions API 22s. i don't recommend anything, it depends on what you want. Visit the Google Maps Platform Support Create a Case page in the Cloud Console. Whether it’s a Basic package, a custom-tailored enterprise solution or a high volume requirement, each option includes credits you can spend for our services. As we already know, a distance matrix API computes distances and ETAs between any given set of origins and destinations. getMillis() : they are always lower than the values provided by google maps or bing. Here is the GPX data I am giving to GraphHopper Map matching library:. One Answer: active answers oldest answers newest answers popular answers. map. It includes many tools/servers, and we will use the following two for this project: The map matching program that takes a GPS path and returns a list of points “snapped” to the road. Let A be an N × N adjacency matrix of a given undirected network in which Aij = 1 if the node i connects to the node j and Aij = 0 otherwise. GraphHopper provides built-in vehicle types that cover some standard use cases, which can be modified by a custom model for fine-grained control over GraphHopper's road prioritization to e. Ideally, I want to be able to send in the GPS coordinates of the locations, use the data of OpenStreetMap, and get as an output a distance matrix with the given locations, all of this would be done offline on my AWS server. A graph with diameter two is a graph such that the longest distance between any two vertices is equal to two. If less than 99. Q&A for work. (Using PHP or C++ would. Monitoring : A set of tools, both in the Cloud Console and through an API, that let you monitor API usage, quota, and billing information and define alerts when any of these metrics approaches a predefined limit. Recently we added some new path details: leg_time and leg_distance. 7. Let G be a connected graph with V(G) = {v1,. Let us assume that there are two "distinct" n-vertex graphs G and G' which realize the distance matrix D. 4 JSON Nested Elements Undefined. Example:the distance matrix based on the quasi-euclidean distance (1) is calculated and corrected according to Formula (4). The GraphHopper Directions API is a collection of routing related APIs: like the Routing API, the Matrix API, the Route Optimization API and the Geocoding API. DistanceMatrixService class. If you set the mode to transit, you can optionally specify either a departure_time or an arrival_time. Microsoft have been busy, working hard on the Bing Maps v8 Web Control and adding rich new functionality. The GraphHopper Directions API that we host falls under our usage terms and always requires an API key. For each hexagon I take its centre and use it as the origin of a Google Maps Distance Matrix query. 0 and of course make the request to Google Maps. It is open source and so you can host it on your own servers or use our privacy-friendly GraphHopper Directions API as a back end. One lib to route them all - routingpy is a Python 3 client for several popular routing webservices. function initMap(): void {. In January 2016, the developers of GraphHopper and jsprit formed the company GraphHopper GmbH. I need a developer that can create a first table using "Graphhopper opensource distance Matrix API", its OpenStreetMap — Example: [login to view URL] Once it's created that matrix, I need to export a second table (sreenshot attached) that gives all postal codes related to each postal code in a max of 20km, and ordered by distanceThe adjacency matrix represents the presence or absence of an edge connecting two vertices, while the distance matrix represents the shortest path between two vertices. Yes, you can do this with GraphHopper. This is a simple package that allows access to the Google Maps Distance Matrix API using a (mostly) fluent API. You can specify several options, including mode of transportation, such as driving, biking, transit or walking, as well as transit modes, such as bus, subway, train, tram, or rail. 0 Google Distance Matrix Api React Js Cant Set Distance To The State. 1 to 5 or 4 to 4 like in the following example. The tricky thing in the case above is that the elevation interpolation for ferries, tunnels and bridges rewrites the distances. See the updated blog post with several examples. importLibrary ("routes"). , are in. E. If neither time is specified, the departure_time defaults to now (that is, the departure time defaults to the current time). ## Get Started To get started you can try [GraphHopper Maps](README. It tells GraphHopper to suppress the instructions and the waypoints which speeds up the calculation to some extend. You could calculate it, using (t x v) formula, because you specified that your vehicle moves at the average speed. Google distance matrix api quota behaves unreliable. Matrix API. As it is said in the answer: yes it is possible via Java or – Karussell. Disclaimer: We updated the format for custom models. You can use. ai API is contributing to a new type of future mobility from Turnn. A distance matrix is a table that shows the distance between pairs of objects. 2) The supported travel modes for the Distance Matrix API are driving, transit, bicycling, and walking to get travel distances. Client (key='YOUR_API_KEY_HERE') Then declare an empty array where I will put my results: my_result= [] Then use a for loop for lst_store1 array and put a for loop inside it for lst_store2 array. For example, which. With the GraphHopper Directions API it is easy to calculate the route from A to B including multiple intermediate waypoints. One Answer: active answers oldest answers newest answers popular answers. A free tier is provided - $200 monthly credit. com escreveu: karussell April 18, 2020, 1:33pm 9How to. Distance Matrix request and responses. We provide free code samples, developer documentation, and even a lively forum to flatten the learning curve and speed up development cycles. To install GraphHopper with this feature on your own server download the JDK, the routing server, the configuration file and the OpenStreetMap data: Now […] Make a distance matrix request. I used the Euclidean distance formular to get a distance matrix /// @brief Compute Euclidean distance matrix from locations array. If we start with the linear map T, then the matrix M(T) = A = (aij) is defined via Equation 6. I don't know of any all-purpose API that gives you the "railway distance" between two points, not least because even more than with car traffic, the exact specifications of the rolling stock limit which tracks you can use. e. import networkx as nx G = G=nx. In this section, we'll introduce the Distance Matrix API. Hi Guys, I just started using Graphhopper and this might be a noob question so forgive me for this. The aim of. text. maps. Google Maps APIs allow you to find an excat route that ads up to this distance, but this isn’t in the scope of this. The larger distance_influence is the more GraphHopper will prioritize routes with a small total distance. Map-matching is an approach to minimize the errors in GPS data. . The biggest disadvantage in this case is the mismatch of estimated time of. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":". When you first set up an account you’ll get a free trial but when this expires you’ll have to enable billing. instructions and add the distance until the sign is 5 (waypoint) or 4 (finish)Hello, I use the JSPRIT with time/distance matrix acquisition, which is a relatively long process no matter what method the matrix acquisition is to be chosen (opensource or commercial e. 100M+ installed. The results for the map on the left side are easy to get, see the gist for example 1. Directions API. 1. I'm using Graphhopper core library to compute distance and best path between 2 points, i read about Graphhopper Routing. Here is how I did it: I downloaded and saved the file as "temp. #1854 Contribute . That is we just draw 10, 25, 50, 100, 150, 200, 250 and 300 random geo codes in Berlin, and solved them with our Direction API. 2. BTW: you are probably doing the map matching not correct. This is done using the Xmx flag, e. routingpy currently includes support for. ai Maps API, you can access all kinds of services from the map data to support your business, with just a few lines of code. When you sign up you get a free standard package for 2 weeks. Go to. Specify these by value, or by using the constant's name. Some ideas I had so far: Use an API. com> Description Provides a quick and easy access to the 'GraphHopper' Directions API. (i. Kattylu July 18, 2017, 1:49pm #1. Specify at least three points. 2 million samples, are used for testing the model. var params = { origins: [currentLocation], destinations: endPoints, travelMode: google. One lib to route them all - routingpy is a Python 3 client for several popular routing webservices. You can request these kinds of distance data:. The distance matrix for the specified points in the same order as the time matrix. GraphHopper Maps is the face of the open source GraphHopper routing engine and a fully featured route planner in the browser. To get the distances between any two vertices of an unweighted graph, you can use breadth first search. Maps Platform Distance matrix API Accurate, affordable distance and matrix APIs. This can be done via graphhopper iteratively but is slow. Also path details are now supported for the TomTom add-on. maximum_distance: number: Maximum distance a route can have in meters: 100000: maximum_snapping_radius: number: Maximum distance around a given coordinate to find connectable edges: 100: maximum_distance_round_trip_routes: number: The maximum allowed total distance of a route for the round trip route algo: 100000:. )Step-3: Create a Project: We must have a project to use Google Map Platform. In this tutorial, you will learn how to calculate the distance between two points using the Distance Matrix API. maps. My distance matrix is as follows, I used the classical Multidimensional scaling functionality (in R) and obtained a 2D plot that looks like: But What I am looking for is a graph with nodes. clean data or attach certain data like elevation or turn instructions to it. E. The upcoming version 1. The diagonal entries d ii of the distance matrix are always zero. it calculates all the distances between every point combination. See the example below and the first leg is from Schwarzkollm (start) to Bröthen (via point) and the second leg is from […] Hello, I would like to know which is the best option to use the matrix of time and distance. Learn how to build your app with GraphHopper's Directions API Incredibly Fast Distance Matrix API With GraphHopper One of the main purposes of our open-source routing engine is calculating the ideal route to get from one place to another. 0. Here is how I did it: I downloaded and saved the file as "temp. How we reduced the cost-distance calculation by 5 times. ### Description The Matrix calculates the well known distance-matrix for a set of points, i. github","contentType":"directory"},{"name":"benchmark","path":"benchmark. TravelTime API is more cost-effective than the Google Distance Matrix API for calculating large matrices of travel times at once. ### Description The Matrix calculates the well known distance-matrix for a set of points, i. Start development: Clone this repository. The most simple example is a tourist trying to decide which pizza is close to him instead of using beeline distance she can calculate a 1x4 matrix. For example: the Route Optimization API is a. 2. For a small propeller plane (like a cessna), use 165mph. Since I have to use offline more, I have to work with OpenStreetMap data. Returns: result (M, N) ndarray. React JS Google Maps Distance Matrix Error: Uncaught TypeError: locations. The R packages I found so far seems can't deal with Inf in the distance matrix. the details like cycleway, or bridleway where missing, which is now returned instead of a generic “other” value. We want matrix for this. 8 Km. A “leg” is a specific part of the route. See the updated blog post with several examples. Using publicly available map data from OpenStreetMap it can calculate the optimal route for a given source-target pair for many different vehicles and flexible optimization criteria. With many vehicle profiles — from mountain bikes over hiking to racing bikes — you’ll get a. GraphHopper facilitates with simplified documentation and security code as well as an array of API components. To put it in other words and figures, this new approach allows us to calculate over 181 000 road distances every second! It helped us to reduce the overall computation time of solving a vehicle routing problem significantly. The Distance Matrix API provides information based on the recommended route between start and end points. Among the first results related to the distance matrix, the remarkable theorem proved by Graham and Pollack [26] that gives a formulas of the determinant of the distance matrix of a tree depending only on the order n. v: igraph object or numeric vector, the vertices from which each distance is calculated. stefanholder mentioned this issue on Jan 12, 2017. 9758161 End Point: 11. TypeScript JavaScript CSS HTML. Destination 51. Customize it by avoiding areas, specific street types or whole countries. The GraphHopper Directions API is an offering of the GraphHopper GmbH and includes a Geocoding API, a Distance Matrix API, a Map Matching API, an Isochrone API and a. {"payload":{"allShortcutsEnabled":false,"fileTree":{"client-hc/src/test/java/com/graphhopper/api":{"items":[{"name":"model","path":"client-hc/src/test/java/com. Whenever I make use of PostMan it returns properly. GraphHopper Directions API. 6 1 I will get a graph in which A are connected to C but not to B ,B are connected to C , and C are connected. Let’s see how you can use the Distance Matrix API to choose the closest repair technician. Click Close. Step-4: Enable Distance Matrix API: To calculate distance and duration. I have been trying to request data from google using the distance matrix but everytime I requested it throws up "Cross-Origin Request Blocked" using AJAX API. The order of the point parameter is important. NextBillion. here in this presented example below the result['rows'][0]['elements'] is a JSON object that has two keys one for the distance and the other for the duration. If you want to test the amazing speed of GraphHopper online you can use the instance at GraphHopper. If you have to prepare the. addTransportDistance(job1, job2, distance); }GraphHopper Maps is an online route planner based on OpenStreetMap data and open source software. We’ve also taken the usage limits to calculate how long it would take to get the required amount of data. 14); a. An approach that occurs on mind is to create 3 Time/Distance matrices for all locations, each representing a period of the day, say 08:00 to 12:00 , 12:00 to 16:00, 16:00 to 20:00 for example, then calculate new Distance/Travel Time for each matrix , and then rely on different matrices depending on Start time, arrival time and departure time. Google Cloud Next & Events. Add the following code to your. Great! response. GraphHopper Forum Add new Customer Distance Matrix. Is there any sample code to create distance and time matrix using Bing maps. Google Maps Distance API is undefined in react. jar”. 8 million samples were used for training the ANN model and the rest, 0. For the map on the right side can try the following procedure explained in pseudocode here or see example 2 as gist for a more complete one:Distance rank of general graphs. js isochrone map server. In this tutorial, you will learn how to calculate the distance between two points using the Distance Matrix API. inside an if-statement. 1. 7 B 0. js:45). To get distances you'll have to call regular route service for each pair of coordinates (hours). E. Note that the matrix is not necessarily symmetric as you can have one-way roads, and the diagonal is 0 because a location to itself has always the distance of 0. Does the opensource graphhopper include the matrix computation method? I am trying to run a local copy via the -web flag and it seems to be working fine, however I don’t see what URL I should use for matrix distance/time requests. Alternatively, you can click the 'Create Case' button at the top of the Google Maps Platform Support page. We offer the Matrix API as part of our commercial GraphHopper Directions API, yes. It can use this open source routing engine or the GraphHopper Directions API , which provides the Routing API, a Route Optimization API (based on jsprit ), a fast Matrix API. Specify at least 2 points. Go to the Billing page of the Cloud Console to ensure you have a valid billing account and visit the Marketplace to enable an API on your project. Google Apps ScriptとGoogle Maps Platformの勉強のため、GoogleスプレッドシートとGoogle Distance Matrix APIを用いて、Google交通情報(旅行時間)を抽出ツールを作成してみました。. , a 2D matrix showing the distance between a point and every other point, are an intermediate output during kNN computation (i. txt" in my working directory. Note that you can also use it with distance matrix only (or time matrix). Google Maps Platform を使用して複数の場所をプロットすると、最寄りのマーカーを視覚的に確認することができます。さらに Distance Matrix API を使用することで一度に多くの距離を決定することができます。 I wish to visualize this distance matrix as a 2D graph. g. Times are based on predictive traffic information, depending on the start time specified in the request. Nearest service; Route service — Similar to Directions API; Table service — Similar to Distance Matrix. This is called geocoding and is described here: Documentation - GraphHopper Directions API. We introduced it as a new, third option and called it “hybrid mode” as it combines the advantages of the flexible and the speed mode. code. DRIVING } distanceService. If I put no restrictions in it, and a user gives me a list n locations,Distance Matrix API Function. getPoints (); double. 15 km. g. 2 Date 2021-02-06 Maintainer Stefan Kuethe <[email protected] now support turn restrictions for our hosted Routing, Isochrone and Matrix APIs on our world-wide routing instances at no additional cost. May 2, 2022 at 0:04. would require to allocate a new algorithm object for every request, which means you allocate arrays with size in the millions for a world wide graph. The distance matrix between the shapes, D∈R+N×N, is calculated using the Adjacent Entries Distance between the self functional maps, where N is the number of the shapes in the benchmark (94)Dij=DAE(Ci,Cj)i,j∈{1…N}. g. the details like cycleway, or bridleway where missing, which is now returned instead of a generic “other” value. Matrix. Java, Embedded Usage . To set up the example and compute the. the closest to the furthest). . From Theorem 3. Learn more about how Distance Matrix API usage is billed. Karussell, I appreciate you trying to help but could you point me to a description of how to use this API offline? All I can see is a Java client which still hits the GraphHopper server to get the results. In the example above, routes for each pair of locations can be good enough, but locations visit order is not optimal. com> Description Provides a quick and easy access to the 'GraphHopper' Directions API. 10. elements will give you an array of the same size as your destinations array. It can use this open source routing engine or the GraphHopper Directions API , which provides the. The Distance Matrix API takes several locations as the origins and the destinations, and returns the distances between each other. Designed for the server, desktop, as well as for mobile devices. google. The data consists of: distance_matrix: An array of distances between locations on meters. E. value ; // Address where you need to. Hello, I would like to know which is the best option to use the matrix of time and distance. Each entry in this matrix represents the Euclidean distance between two vertices vi(G) and Vj(G). Strategies could be: Fastest; Shortest; Low risk of queues; Etc. And if the barrier edge is involved in this interpolation the distance might increase e. But, OSM (which builds the maps) is crowd-sourced data so it's not going to be as complete as one of the world's biggest tech. DistanceMatrixRequest interface . it calculates all the distances between every point combination. What I want is a graph where the edge length between nodes is proportional to the distance between them in the distance matrix. Made for easy generation of Routes and Directions on Maps, Isochrones, Time-Distance Matrix, Pelias Geocoding, POIs, Elevation and routing Optimizations using their amazing API. But I worry about my example flooding your server (which would make me a bad citizen). g I am given 2 geocoordinates close to 2 different train stations , will Graphopper help me find the route and tell me to take specific trains or buses to arrive at. For and example the popular Graph Hopper server doesn't provide distance matrix API for free, it’s a premium feature. A weighted graph and its distance matrix. OSRM matrix is very quick (seconds for 300 locations) but it provides driving times only. Install the package using composer:I am looking to get an approximation of the travel distance and time between several locations. I found out that when R package"igraph" calculate closeness (sum of distances) of a disconnected graph, it. When editing the custom model try out Ctrl+Space for auto complete e. In the Routing we support. of 5 points, I have to add the following; 0, 1, x 0, 2, x 0, 3, x etc. g. • Routing API, • Route Optimization API, • Isochrone API, • Map Matching API, • Matrix API, • Geocoding. computeDistanceBetween). elements[index]. TravelMode. This example requests the distance matrix data between Washington, DC and New York City, NY, in JSON format: Try it! Test this request by entering the URL into your web browser - be sure to replace YOUR_API_KEY with your actual API key . Things get a bit more complicated when priority is not 1 , but the effect stays the same: The larger distance_influence is, the more GraphHopper will focus. That is it. The shortest route with the travel distance and time values are provided with the help of GraphHopper routing engine and map data of OpenStreetMap . 79 cities in the UK. threshold positive int. Path Details Updates. Classic maps client. The other packages implement a fair usage limit. But saw nothing like this on my RSS feeds last couple of months. This makes it easier to get the time, distance and the geometry per “leg”. 0, you need to build the whole project and then invoke the /match endpoint. Distance Matrix API. Using predicted traffic and support for various modes of transportation, the Distance Matrix API can optimize map routing performance in many-to-many scenarios, which can. 9477546 = 130 Water St, Exeter, NH 03833, USA. only one node is lifted, then the distance increases, in this specific case it increases to 0. But you could consider to convert async API to promises. Ignoring these errors in the data can lead to false analyses and misleading conclusions. Calculate travel times for website search. Thus, we received expensive bills from Google Cloud following the number of requests. Of those, I've used Graphhopper and OSRM extensively, but none of the others. 2 of GraphHopper an Open Source road routing engine. Google maps must be able to find both the origin and the destination in order for the function to run. The larger distance_influence is the more GraphHopper will prioritize routes. 2 Topographical Indices in Reverse Problem Formulation.