I am trying to use HERE Maps to implement the eco-routing algorithm which we developed in our lab that requires real time traffic data as an input to the routing algorithm. So far, we were using INRIX dataset to verify our algorithms, but we decided to move to HERE Maps, and use the Traffic API to harness the power of real time traffic data.
Traffic API was very simple to use, and I managed to get the traffic data for a bounding box. It seems like that the traffic flow is passed for each TMC. My question is how to assign the traffic flow data to the links of the map using TMC. More specifically, I am wondering if there is a way to transform the TMC values to an adjacency matrix so that I can assign the traffics to each link and run my optimization algorithm over that graph? Also is it possible to overlay Open Street Maps (OSM) with the HERE Maps traffic data?
Thanks
You can associate the TMC data you get from the traffic data response to a particular link by using PDE layers LINK_TMC_FC1..5. You have look into our PDE documentation in developer site and tcs.ext.here.com/pde/maps?url_root=pde.api.here.com to see the list of layers provided.
Below is a sample PDE request for the Link TMC. Replace app id and code placeholders with actuals:
https://pde.api.here.com/1/tile.json?&layer=LINK_TMC_FC1&level=9&tilex=496&tiley=358®ion=WEU&release=18131&url_root=pde.api.here.com&app_id={YOUR-APP-ID}&app_code={YOUR-APP-CODE}
For all your other questions on creating a matrix and OSM overlay, you have to write your own algorithm. There is no straight forward function provided by Here.
Related
I was trying to extract data from an ESRI map embedded in a website. The objective would be by introducing geographic coordinates to be able to access the values present on the map.
I leave here a print of the map and the respective address. I just cannot understand which method I should use since the map is embedded in the site. What processes should I use?
*for academic purposes
https://zonamentopf.portaldasfinancas.gov.pt/simulador/default.jsp
I must admit, I am not quite sure what you are after in terms of extracting data. I visited the site, and it is a pretty basic embedded web map created using the ArcGIS API for JavaScript, albeit wrapped in JSP. The web map is consuming some publicly accessible Esri services (World_Imagery, World_Boundaries_and_Places), and some non-public organizational services from www.portaldasfinancas.gov.pt.
It seems to me you are interested in geocoding. The pointer/marker on your map was looked up using Esri's ArcGIS Online Geocoding Service:
You have reached the home for the ArcGIS Online Geocoding Service. Use
it to turn addresses into coordinates, coordinates into addresses, or
to locate a point-of-interest.
If you are a developer, detailed documentation for using this service
in your application is available in the ArcGIS Online Geocoding
Service Help.
If you are an ArcGIS for Desktop user, you can use this service for
finding addresses interactively or geocoding a table of addresses.
Since I am not quite clear what you are trying to do, this is about all I can offer for now.
Note: Please respect data ownership. When in doubt, don't save a copy of someone else's data.
It sounds like you want to extract the polygon data in this map. The web app is making requests like this:
https://zonamentopf.portaldasfinancas.gov.pt/simulador/proxy.jsp?http://ags/arcgis/rest/services/SIMIMI/SIMIMI/MapServer/identify?f=json&tolerance=0&returnGeometry=false&imageDisplay=400%2C400%2C96&geometry=%7B%22x%22%3A-886651.3363331377%2C%22y%22%3A4443259.272690449%7D&geometryType=esriGeometryPoint&sr=102100&mapExtent=-887053.8250602124%2C4442583.282721534%2C-885178.7292100423%2C4443968.70385924&layers=all%3A0%2C1%2C2%2C3%2C4&callback=dojo.io.script.jsonp_dojoIoScript11._jsonpCallback
You can remove the callback parameter if you just want the data:
https://zonamentopf.portaldasfinancas.gov.pt/simulador/proxy.jsp?http://ags/arcgis/rest/services/SIMIMI/SIMIMI/MapServer/identify?f=json&tolerance=0&returnGeometry=false&imageDisplay=400%2C400%2C96&geometry=%7B%22x%22%3A-886651.3363331377%2C%22y%22%3A4443259.272690449%7D&geometryType=esriGeometryPoint&sr=102100&mapExtent=-887053.8250602124%2C4442583.282721534%2C-885178.7292100423%2C4443968.70385924&layers=all%3A0%2C1%2C2%2C3%2C4
However, if you just go to that link, you will get an error about a missing or incorrect referrer. To overcome that, you will need to add a header called Referer with value https://zonamentopf.portaldasfinancas.gov.pt/simulador/default.jsp. You can do that in a script or in an application like Postman, but you will not be able to do it in your own web app.
To view the available layers: https://zonamentopf.portaldasfinancas.gov.pt/simulador/proxy.jsp?http://ags/arcgis/rest/services/SIMIMI/SIMIMI/MapServer?f=json (with the Referer header I mentioned)
To view metadata about a single layer, use the following URL. Replace the 0 in /0/ with a different layer ID to get a different layer. https://zonamentopf.portaldasfinancas.gov.pt/simulador/proxy.jsp?http://ags/arcgis/rest/services/SIMIMI/SIMIMI/MapServer/0?f=json (with the Referer header I mentioned)
To query one of those layers to get the data, use the following URL to get everything, or add some query parameters if you want to filter the data. Replace the 0 in /0/ with a different layer ID to get a different layer. https://zonamentopf.portaldasfinancas.gov.pt/simulador/proxy.jsp?http://ags/arcgis/rest/services/SIMIMI/SIMIMI/MapServer/0/query?f=json&outFields=*&where=0%3D0 (with the Referer header I mentioned)
Related answer: https://stackoverflow.com/a/50213419/720773
I'm trying to visualize GPS points on PowerBI maps offline and wonder what would be the best way to achieve that.
Ideally, I'd like to see the offline mapping to have the same effect as directly using the "Map" visualization - GPS points (in data as longitude and latitude columns) plotted on the Bing map. However, our team will need this function offline, because our users are usually under bad internet connections. Also we are wary about Bing's data sharing policy as our GPS information is highly confidential.
So far I've tried PowerBI's shape map function, which allows me to upload a TopoJSON file and use it offline. However, it looks like shape map is better used for highlighting a region on the map, instead of plotting individual GPS points - shape map doesn't seem to allow longitude/latitude. Besides that, shape map does not have as much information like Bing map, such as showing city/road names and etc.
Is there a way to visualize GPS points offline on PowerBI, but still get enough information about what are around the GPS points? I'm referring to PowerBI here but all things I've been doing are on PowerBI Desktop. I don't plan to publish on the web as this will be my company's internal tool. Thanks in advance!
The built-in mapping functions such as the Map visual powered by the Bing maps API and the Eris mapping do not have an offline mode. Both require an online connection. Depending on the level of detail that you require, I would suggest looking into an R or Python visual with one of the mapping libraries. Here are some examples of the R mapping libraries. But getting the map json files into Power BI will also be an issue and may not meet your requirements on the level of detail that you need.
Also we are wary about Bing's data sharing policy as our GPS information is highly confidential.
I wouldn't worry about it, Bing & Power BI mapping is used by a wide number of organisation including heath and military customers. Your confidential data is more at risk with some one copying your Power BI report and sticking it on a USB drive.
However, our team will need this function offline, because our users are usually under bad internet connections
I would try some other options for offline mapping, for example Google Maps has the ability to down load a section of the map for offline/bad connections. I've downloaded the whole UK and its about 100meg.
Hope that helps
I want to write an application that gives me the exact route of a subway.
When you use Google Maps it just connects two stops linearly, but not the actual way.
Is there a way to move a route anywhere on a map without being bound to roads?
If there's any solution (doesn't have to be with the Google Maps API) please let me know.
Edit:
Example
Google shows the train route like the brown line, but the train actually drives the blue line. What I would like to do is get the blue line so that I can get the coordinates of the route and calculate the curves and elevation.
I know that I could add like 50 waypoint and get get a "fake" route with them, but I would like to have it automatic and not done by hand.
To show the transit directions (subway, bus, tram, etc.) Google Maps uses the data provided by transit agencies in the form of GTFS feeds. This is a responsibility of the agency to provide a detailed shape of the route for the transport according to the GTFS specification. You can have a look at GTFS documentation to figure out how does it work:
https://developers.google.com/transit/gtfs/
https://developers.google.com/transit/gtfs/reference/#general_transit_feed_specification_reference
I hope this helps.
I am trying to get the distance traveled on a transit route -- particularly San Francisco MUNI, but the standards NextBus, GTFS, and Google Maps API appear to be universal. I'm comfortable using any of these APIs, I'm just not sure how to go about this problem.
The easy way - ask Google Maps (this using webservices, but there is also the javascript API):
http://maps.googleapis.com/maps/api/directions/json?origin=37.7954199,-122.397&destination=37.7873299,-122.44691&sensor=false&mode=transit&departure_time=1348109609&alternatives=true
this JSON includes distance traveled, but there are two issues:
Google does not allow you to use this data unless you're displaying a map, which I don't want to do
I would need to ensure that the distance returned is for the correct route/line, since it can/will give multiple routing options. This is probably doable but would require more logic.
EDIT: using alternatives=true (or provideRouteAlternatives: true using the javascript API) only returns a maximum of 3 routes, which here in SF often doesn't include the route I'm looking for (other transit agencies, multiple lines on the same route, etc). So this isn't such a great option.
NextBus:
example route config:
http://webservices.nextbus.com/service/publicXMLFeed?command=routeConfig&a=sf-muni&r=1
The coordinates for each stop are given, but connecting the dots on those is not the same as the route taken -- it will cut corners, etc, and I need this to be accurate. The actual route taken is given under <path>/<point>, but I don't see any obvious correlation between stop and path coordinates. Plus, NextBus says in their documentation (p.10 near the bottom) that you should NOT connect points between <path> segments, they're only meant for drawing on a map and can overlap.
GTFS:
The GTFS data also separates stop and "shape" coordinates (like NextBus paths). Unfortunately, the coordinates are slightly different for the same stops between NextBus and GTFS (rounding), though the stop ID/tags are the same. Also, the data files are in the megabytes, and I need to use this for a mobile app. I suppose I could put all the data in a database and query that, but that still leaves figuring out how to correlate the stops with the shape. The "shapes_distance_traveled" column in the shapes.txt file is especially promising. MUNI chooses to leave the optional "shapes_distance_traveled" field out of stop_times.txt, though.
Any advice would be appreciated, I understand this seems like an epic task to get a simple value. Maybe I'll just throw a map in to legitimately use the distance :)
Instead of using Google Maps, I would look into the un-encumbered licensing of OpenStreetMap. There are multiple
routing engines that can use OSM data. Personally, I would use routing in PostGIS or SQLite, but depending on your skillset you might choose another.
You've clearly done your research, (+1), and as you said, the easy way is to ask Google. If it is worth for you then you might want to look into purchasing a business licence to use the Google Maps API, and negotiate with them about the requirement of displaying a map. That's the only legal way I can think of with the Google API. Alternatively, you can try building you own routing engine with data from the TIGER data set, which is freely available from the US Census Bureau, but again, as you said, it may seem like an epic task. :-)
I am building an Events site in which the address of a given event will be stored to be used within a map on the page. Whilst viewing an Individual Events' page i would like to provide a list of similar events on side of the page. I would also like to rank this list by distance and display a small map with a marker on it for each item on the list.
I was thinking of Geocoding the Events address upon content input and then storing this data within the sites database. Doing this would allow me to calculate the distance of an event on the server and then provide an ordered list to display.
My question is this:
Would this violate the Googlemaps Terms of Service?
These terms:
"the geocoder for any purpose other than obtaining locations that will be displayed using the Google Maps APIs is a violation of the Terms of Service. You may use the HTTP geocoder to geocode addresses outside of your Google Maps API application so that they may be cached and later displayed using one of the Google Maps APIs, but locations obtained using the Geocoding Web Service may not be used by any other application, distributed by other means, or resold."
Suggest that storing the data is not a problem but i am unsure that the process of ordering the list by long lat would not result in a violation.
Any advice would be greatly appreciated.
As long as the map your refer to in your question is a Google Map and you are using the geocoded data to display features on a Google Map, you are fine. The client-side google.maps.Geocoderdev-guide is intended for dynamic requests that are based on real-time user interaction that drives a need to perform on-the-fly geocoding. But Google encourages you to consider using the Geocoding Web Servicedev-guide on the server-side, when you wish to pre-geocode static addresses or coordinates prior to using the response values on a Google Map. Storing those values is assumed.
It is common to perform some form of post-response/post-storage processing on those values, just like the ordering by distance that you describe, to fit whatever use case is needed to populate your map with the appropriate data. I understand you want to be careful to remain within the TOS, but what you describe sounds pretty standard.