Getting traffic forecast

A traffic forecast is produced by the simulation engine. The simulation engine uses the link network for its calculation. Therefore you can retrieve the forecast results of Optima only on the link network or on streets that belong to the link network.

The endpoint generally provides huge XML responses.

Important: You can adopt the HTTP header Accept-Encoding:gzip to ask the server to provide gzipped data. This is particularly useful to save bandwidth, and also using the RLIN module.

If you have installed the RLIN module (see → Installing pre-computed RLIN module) and you make a query based only on the strt location, with an empty request payload, you can get a pre-computed and quicker response associated to the latest base simulation.

More generally, you can make:

a query based only on the strt location, with an empty request payload, also if RLIN module is not available (with a slower response time).
a query based on any other combination of parameters, with an empty request payload.
a query based on any other combination of parameters, with a request payload.

Authentication phase

Before using the endpoint, you must run the authentication phase (→ Login).

After the authentication, a session opens and a valid session token persists until:

The end of the session time-out, that is set through the parameter sessionTimeout (→ OptimaWSI configuration > OptimaAuth node).
An explicit Logout call (→ Logout).

Request Endpoint

Request

GET

https://<OPTIMA_HOST_IP_ADDRESS>:<PORT_NUMBER>/datex-interface/orca2/rlin/{location}

Request resource

Resource	Description
{location}	Supported locations are: strt openlr ploc For more details, please see → Basics on locations.

Resource

Description

{location}

Supported locations are:

strt
openlr
ploc

For more details, please see → Basics on locations.

Request parameters

Parameter	Required	Description
startTime	NO	Start of the time interval used to compute the forecast results. You must either specify both startTime and endTime, or neither. If startTime=endTime=null, both are set to the values of the last simulation. The format is ISO 8601 with or without timezone.
endTime	NO	End of the time interval used to compute the forecast results. You must either specify both startTime and endTime, or neither. If startTime=endTime=null, both are set to the values of the last simulation. The format is ISO 8601 with or without timezone.
tsys	NO	It specifies the transport system for which forecast results are provided. You can ask for the results of more than one transport system. Results are returned if all of these transport systems are valid transport systems. If this parameter is not specified, the forecast results refer to the equivalent transport system.
simulationtype	NO	String type. Tip: The tables involved are all the tables characterized by the indexes from -N to 2 as indicated in the node <linkResultsDataInterface> of the file optima-configuration.xml. Example: `<linkResultsDataInterface> <FORE_3 index="-3" table="rlin_tsys_tre_fore_3" /> <FORE_2 index="-2" table="rlin_tsys_tre_fore_2" /> <FORE_1 index="-1" table="rlin_tsys_tre_fore_1" /> <FORE_0 index="0" table="rlin_tsys_tre_fore" /> <RLTM index="1" table="rlin_tsys_tre_rltm" /> <MTF index="2" table="rlin_tsys_tre_midterm" /> </linkResultsDataInterface>` The table associated to the index -N is related to the N^th day before the current day. Important: After the installation, only tables from 0 to 2 are configured. The tables with negative indexes are dependent on the customer context. You can specify these values: best: it returns the forecast results at the specified time, looking hierarchically to results stored by: The Short Term Forecast (STF) engine The Mid Term Forecast (MTF) engine Data that best fits the specified time is preferred. For example, in case of overlapping results at the queried time: If the time is in the near future, results are taken from the short-term forecast engine. If the time is in the far future, results are taken from the mid-term forecast engine. A graphic model to understand better the time dominions involved: The general policy to deliver the results is based on this hierarchy of time intervals: RLTM: around the current time (NOW) FORE_0: the recent past FORE_1: one day before Day Start FORE_2: two days before Day Start MTF: the future This kind of query is allowed only for a given instant, thus you must specify startTime=endTime. The main possible cases are: historical: it returns forecast results stored in the data warehouse. Tables involved are tables with indexes -1,-2,-3 (union of tables). shortterm:it returns forecast results of the short-term forecast engine. Tables involved are tables with indexes 0 and 1 (union of tables). midterm: it returns forecast results of the mid-term forecast engine. Table involved is table with index 2. empty: it is the default value and returns all the data available within the interval (startTime,endTime) (union of all tables with any index). Tip: If startTime=endTime=null, the value of the last simulation - that matches with RLTM - is considered.
idno	NO	Integer type. Available only when using the strt location and in conjunction with the parameter fromnode. ID of the street for which results are queried.
fromnode	NO	Integer type. Available only when using the strt location and in conjunction with the parameter idno. ID of the start node of the street for which results are queried.
code	NO	String type. Available only when using the openlr location. This is the OpenLR code of the street, or streets, for which results are queried.
type	NO	String type. Mandatory when using the ploc location. Optionally, it can be used in conjunction with the parameters pril and secl. It is the type of the alternative graph for which results are queried. Important: The type depends on the specific project, there is no enumeration of all possible types. An example of a type commonly used is TMC. For further specifications about alternative graphs managed by Optima: → Transportation Data Exchange (TDE).
pril	NO	String type. Predefined primary location ID (to node). You can specify a value for pril only when you query for ploc-type locations. Furthermore, for ploc locations, you have to either specify both pril and secl (thus selecting a single location), or none of the two. This is part of the key of the street for which results are queried. For further specifications about alternative graphs managed by Optima: → Transportation Data Exchange (TDE).
secl	NO	String type. Predefined secondary location ID (from node). You can specify a value for secl only when you query for ploc-type locations. Furthermore, for ploc locations, you have to either specify both pril and secl (thus selecting a single location), or none of the two. This is part of the key of the street for which results are queried. For further specifications about alternative graphs managed by Optima: → Transportation Data Exchange (TDE).
fore	NO	Integer type. The fore parameter is used to define the distance in seconds between the simulation instant and the instant when the request is sent. The distance provides how far in the future you want the result with respect to the NOW simulation time, and fully depends on the time of the request. The fore value can be negative, representing a moment in the past. Please note that the request parameter fore is returned as it is in the homonym field in the response. Important: If in the response of the query is returned as a fore value different from the value of the input parameter, it is not meaningful and MUST be ignored. Important: The valuer of the input parameter fore IS NOT correlated with the column table.fore of the DB tables rlin_tsys_tre*
simid	NO	Integer type. Simulation ID of the simulation for which results are queried.

Request content-type

application/xml

Request body (payload)

You can specify - only for {location}=strt - a list of streets in the body (see → Example: Latest forecast results for a specific subset of streets).

Response

Response status

HTTP status	Description
200 OK	Result of the processed request.
304 Not modified	If the RLIN module is installed and you make a request based only on the strt location, with an empty request payload. The code 304 is indicative of a request using the if-modified-since HTTP header (see Mozilla HTTP Header) when there is not newer version of the forecast than the date supplied in the header.
400 Bad request	Several conditions can be classified under this code. Generally, when the API has been called with wrong arguments. In some cases the error message contains more specific information. For example, an ill-formed body such as this: street:55233519,65166505&street:55233519,65166506 ... Is handled by a response 400 with the following error details: These streets were wrongly declared: '55233519,65166505&street:55233519,65166506'
404 Not found	Result of the processed request. For example, in case of a missing street or a missing link. If the RLIN module is installed and you make a request based only on the strt location, with an empty request payload, code 404 is indicating the recomputing of the results.
500 Internal server error	Endpoint instance is not found.

Response content-type

application/xml

Response output

XML message describing a forecast result as defined in orca2.xsd.

Example: Latest forecast results for all the network on strt

Request

https://<OPTIMA_HOST_IP_ADDRESS>:<PORT_NUMBER>/datex-interface/orca2/rlin/strt

Response status

HTTP status	Description
200 OK	Result of the processed request.

Response output

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Orca2Model xmlns="http://sistemaits.com/orca2/1">
  <exchange>
    <provider>PTV-OPTIMA</provider>
  </exchange>
  <payloadPublication xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ForecastPublication" publicationTime="2016-02-09T14:29:01.165Europe/Rome">
    <MetaInfo>
      <LocationUsed xsi:type="LocationUsedTDE" type="Street"/>
      <timezone>Europe/Rome</timezone>
    </MetaInfo>
    <forecastData>
      <trafficElement xsi:type="StreetTraffic" strt="55192980" fsnd="65688430" sped="52.845" fore="0" flow="101.08" dens="1.913" time="7.069" iflw="101.113" oflw="101.064" o
uca="5100.0" quel="0.0" quen="0.294" esta="0" nveh="0.082" stor="51.426" queu="0.024" ista="0" baseSpeed="52.845" startTime="2016-02-09T14:00:00" endTime="2016-02
-09T14:15:00"/>
      <trafficElement xsi:type="StreetTraffic" strt="55192980" fsnd="65688430" sped="52.831" fore="900" flow="109.023" dens="2.064" time="7.07" iflw="109.152" oflw="108.96"
ouca="5100.0" quel="0.001" quen="0.294" esta="0" nveh="0.089" stor="51.413" queu="0.026" ista="0" baseSpeed="52.831" startTime="2016-02-09T14:15:00” endTime="2016
-02-09T14:30:00"/>
      <trafficElement xsi:type="StreetTraffic" strt="55192980" fsnd="65688430" sped="52.837" fore="1800" flow="112.271" dens="2.125" time="7.07" iflw="112.278" oflw="112.267
" ouca="5100.0" quel="0.001" quen="0.294" esta="0" nveh="0.091" stor="51.407" queu="0.027" ista="0" baseSpeed="52.837" startTime="2016-02-09T14:30:00” endTime="20
16-02-09T14:45:00”/>
      <trafficElement xsi:type="StreetTraffic" strt="55192980" fsnd="65688430" sped="52.837" fore="2700" flow="112.87" dens="2.136" time="7.07" iflw="112.877" oflw="112.866"
 ouca="5100.0" quel="0.001" quen="0.294" esta="0" nveh="0.092" stor="51.406" queu="0.027" ista="0" baseSpeed="52.837" startTime="2016-02-09T14:45:00" endTime="201
6-02-09T15:00:00"/>
      <trafficElement xsi:type="StreetTraffic" strt="55192980" fsnd="65688430" sped="52.839" fore="3600" flow="112.182" dens="2.123" time="7.07" iflw="112.167" oflw="112.19"
 ouca="5100.0" quel="0.001" quen="0.294" esta="0" nveh="0.091" stor="51.407" queu="0.027" ista="0" baseSpeed="52.839" startTime="2016-02-09T15:00:00" endTime="201
6-02-09T15:15:00"/>
      <trafficElement xsi:type="StreetTraffic" strt="55192980" fsnd="65688430" sped="52.834" fore="4500" flow="113.651" dens="2.151" time="7.07" iflw="113.683" oflw="113.636
" ouca="5100.0" quel="0.001" quen="0.294" esta="0" nveh="0.092" stor="51.405" queu="0.027" ista="0" baseSpeed="52.834" startTime="2016-02-09T15:15:00" endTime="20
16-02-09T15:30:00"/>
…
    </forecastData>
  </payloadPublication>
</Orca2Model>

Example: Latest forecast results for a specific subset of streets

In case of {location}=strt, you can also specify a body (payload) where there can be indicated a specific list of streets.

The body must be encoded according to the format x-www-form-urlencoded.

The format is raw string, where each street element is separated by an ampersand & and defined by a pair of values (idno, fromnode) separated by a comma:

street=idno_1,fromnode_1&street=idno_2,fromnode_2&...&street=idno_k,fromnode_k&...

Example of a body with three streets:

street=50,4501&street=127,3154&street=2345,3674

Request

https://<OPTIMA_HOST_IP_ADDRESS>:<PORT_NUMBER>/datex-interface/orca2/rlin/strt

Request body (payload)

street=50,4501&street=127,3152

Important: The response is based on a subset of these two streets only.

Response status

HTTP status

Description

200 OK

Result of the processed request.

400 Bad request

Several conditions can be classified under this code.

Generally, when the API has been called with wrong arguments.

404 Not found

Result of the processed request.

For example, in case of a missing street or a missing link.

Response output

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Orca2Model xmlns="http://sistemaits.com/orca2/1" xmlns:ns2="http://datex2.eu/schema/2/2_0">
    <exchange>
        <provider>PTV-OPTIMA</provider>
    </exchange>
    <payloadPublication xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ForecastPublication" publicationTime="2019-10-07T16:54:33.848">
        <MetaInfo>
            <LocationUsed xsi:type="LocationUsedTDE" type="Street"/>
            <timezone>Europe/Berlin</timezone>
        </MetaInfo>
        <forecastData simulationId="35835" applicationName="TRE_tattico" base="true" simulationStartTime="2015-12-24T14:45:00" simulationEndTime="2015-12-24T14:45:00" simulationPeriodStartTime="2015-12-24T14:45:00" simulationPeriodEndTime="2015-12-24T15:30:00" creationTime="2015-12-24T14:45:00">
            <trafficElement xsi:type="StreetTraffic" strt="50" fsnd="4501" sped="80.0" fore="-900" flow="0.0" dens="0.0" time="3.69" iflw="0.0" oflw="0.0" ouca="5500.0" quel="0.0" quen="0.0" esta="0" nveh="0.0" stor="32.8" queu="0.0" ista="0" baseSpeed="50.0" startTime="2015-12-24T14:45:00" endTime="2015-12-24T15:00:00"/>
            <trafficElement xsi:type="StreetTraffic" strt="50" fsnd="4501" sped="80.0" fore="0" flow="379.098" dens="4.739" time="3.69" iflw="380.929" oflw="377.267" ouca="5500.0" quel="0.0" quen="0.0" esta="0" nveh="0.389" stor="33.189" queu="0.0" ista="0" baseSpeed="50.0" startTime="2015-12-24T15:00:00" endTime="2015-12-24T15:15:00"/>
            <trafficElement xsi:type="StreetTraffic" strt="50" fsnd="4501" sped="80.0" fore="900" flow="786.332" dens="9.829" time="3.69" iflw="787.28" oflw="785.384" ouca="5500.0" quel="0.0" quen="0.0" esta="0" nveh="0.806" stor="30.234" queu="0.0" ista="0" baseSpeed="50.0" startTime="2015-12-24T15:15:00" endTime="2015-12-24T15:30:00"/>
            <trafficElement xsi:type="StreetTraffic" strt="127" fsnd="3152" sped="80.0" fore="900" flow="786.332" dens="9.829" time="3.69" iflw="787.28" oflw="785.384" ouca="5500.0" quel="0.0" quen="0.0" esta="0" nveh="0.806" stor="30.234" queu="0.0" ista="0" baseSpeed="50.0" startTime="2015-12-24T15:15:00" endTime="2015-12-24T15:30:00"/>
        </forecastData>
    </payloadPublication>
</Orca2Model>

Additional Notes

When a body is specified, the parameters idno and fromnode must not be set, otherwise a code 400 is returned. In case of any missing street or any missing links for any street, a code 404 is returned.

A default value for the maximum number of streets to be queried can be specified in optima-configuration.xml under the configuration node <datex-interface>.

<datex-interface>
....
    <maxStreetsNum>20000</maxStreetsNum>
....
</datex-interface>

The default value is 20000.

Tip: This value has been tested to get high performances.

Example: Latest forecast results for all the network on ploc

Request

https://<OPTIMA_HOST_IP_ADDRESS>:<PORT_NUMBER>/datex-interface/orca2/rlin/ploc?type=TMC

Response status

HTTP status	Description
200 OK	Result of the processed request.

Response output

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Orca2Model xmlns="http://sistemaits.com/orca2/1" xmlns:ns2="http://datex2.eu/schema/2/2_0">
  <exchange>
    <provider>PTV-OPTIMA</provider>
  </exchange>
  <payloadPublication xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ForecastPublication" publicationTime="2022-09-08T17:33:59.06797">
    <MetaInfo>
      <LocationUsed xsi:type="LocationUsedPredefined" type="TMC"/>
      <timezone>Europe/Rome</timezone>
    </MetaInfo>
    <forecastData simulationId="813" applicationName="TRE_tattico" base="true" simulationStartTime="2022-09-08T11:15:00.039" simulationEndTime="2022-09-08T11:16:38" simulationPeriodStartTime="2022-09-08T11:00:00" simulationPeriodEndTime="2022-09-08T12:30:00" creationTime="2022-09-08T11:16:38">
      <trafficElement xsi:type="PLOCTraffic" pril="16223" secl="16224" fprg="3343.2563" tprg="3405.7012" sped="45.561" fore="-900" flow="550.082" dens="12.073" time="4.985" iflw="546.9842035667012" oflw="552.2757944286441" ouca="1700.0" quel="0.0" quen="0.0" esta="0" nveh="0.7485555309025304" stor="11.024" queu="0.0" ista="0" baseSpeed="50.0" startTime="2022-09-08T10:45:00" endTime="2022-09-08T11:00:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="16224" secl="16223" fprg="0.0" tprg="62.44484" sped="51.434" fore="-900" flow="832.238" dens="16.181" time="4.302" iflw="830.1618051223886" oflw="828.3209865299013" ouca="1700.0" quel="0.0" quen="0.0" esta="0" nveh="1.0032094004176062" stor="10.35" queu="0.0" ista="0" baseSpeed="60.0" startTime="2022-09-08T10:45:00" endTime="2022-09-08T11:00:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="16223" secl="16224" fprg="3405.7012" tprg="3496.1328" sped="52.656" fore="-900" flow="554.808" dens="10.536" time="6.183" iflw="552.2757944286441" oflw="555.9111344879584" ouca="3400.0" quel="0.0" quen="0.0" esta="0" nveh="0.9482738531221212" stor="34.002" queu="0.0" ista="0" baseSpeed="55.0" startTime="2022-09-08T10:45:00" endTime="2022-09-08T11:00:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="16223" secl="16222" fprg="2035.2052" tprg="2125.6367" sped="51.4" fore="-900" flow="831.878" dens="16.184" time="6.284" iflw="831.7207059519169" oflw="830.1618051223886" ouca="3400.0" quel="0.0" quen="0.0" esta="0" nveh="1.4565912753769694" stor="33.017" queu="0.0" ista="0" baseSpeed="55.0" startTime="2022-09-08T10:45:00" endTime="2022-09-08T11:00:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="16221" secl="16222" fprg="1242.828" tprg="1283.1094" sped="28.661" fore="-900" flow="2017.077" dens="70.377" time="5.151" iflw="2005.7101990244792" oflw="1986.0512993413868" ouca="3400.0" quel="0.0" quen="0.0" esta="0" nveh="2.815096023565239" stor="12.842" queu="0.0" ista="0" baseSpeed="35.0" startTime="2022-09-08T10:45:00" endTime="2022-09-08T11:00:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="4795" secl="4794" fprg="5049.1133" tprg="5068.7163" sped="55.247" fore="-900" flow="846.834" dens="15.328" time="278.695" iflw="921.9381013564962" oflw="951.9313120778243" ouca="3600.0" quel="0.0" quen="0.0" esta="0" nveh="65.26763239219159" stor="1564.275" queu="0.0" ista="0" baseSpeed="70.0" startTime="2022-09-08T11:00:00" endTime="2022-09-08T11:15:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="4795" secl="4794" fprg="3745.5725" tprg="4834.571" sped="55.247" fore="-900" flow="846.834" dens="15.328" time="278.695" iflw="921.9381013564962" oflw="951.9313120778243" ouca="3600.0" quel="0.0" quen="0.0" esta="0" nveh="65.26763239219159" stor="1564.275" queu="0.0" ista="0" baseSpeed="70.0" startTime="2022-09-08T11:00:00" endTime="2022-09-08T11:15:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="4962" secl="4963" fprg="596.6403" tprg="608.9739" sped="29.025" fore="-900" flow="3244.871" dens="111.796" time="1.956" iflw="3095.362513197615" oflw="2976.4718992397393" ouca="3600.0" quel="0.0" quen="0.0" esta="0" nveh="1.3415475034842834" stor="3.385" queu="0.0" ista="0" baseSpeed="70.0" startTime="2022-09-08T11:00:00" endTime="2022-09-08T11:15:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="4963" secl="4962" fprg="330.15308" tprg="342.48663" sped="71.633" fore="-900" flow="1852.118" dens="25.856" time="0.596" iflw="1842.6963931149003" oflw="1851.734983305687" ouca="5400.0" quel="0.0" quen="0.0" esta="0" nveh="0.3102660395943874" stor="13.504" queu="0.0" ista="0" baseSpeed="75.0" startTime="2022-09-08T11:00:00" endTime="2022-09-08T11:15:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="4963" secl="4962" fprg="78.30779" tprg="147.26149" sped="59.323" fore="-900" flow="1861.371" dens="31.377" time="14.568" iflw="1829.788018664607" oflw="1842.6963931149003" ouca="3600.0" quel="0.0" quen="0.0" esta="0" nveh="7.906952043892804" stor="82.092" queu="0.0" ista="0" baseSpeed="70.0" startTime="2022-09-08T11:00:00" endTime="2022-09-08T11:15:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="4963" secl="4962" fprg="193.10013" tprg="274.89215" sped="59.323" fore="-900" flow="1861.371" dens="31.377" time="14.568" iflw="1829.788018664607" oflw="1842.6963931149003" ouca="3600.0" quel="0.0" quen="0.0" esta="0" nveh="7.906952043892804" stor="82.092" queu="0.0" ista="0" baseSpeed="70.0" startTime="2022-09-08T11:00:00" endTime="2022-09-08T11:15:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="4963" secl="4962" fprg="147.26149" tprg="193.10013" sped="59.323" fore="-900" flow="1861.371" dens="31.377" time="14.568" iflw="1829.788018664607" oflw="1842.6963931149003" ouca="3600.0" quel="0.0" quen="0.0" esta="0" nveh="7.906952043892804" stor="82.092" queu="0.0" ista="0" baseSpeed="70.0" startTime="2022-09-08T11:00:00" endTime="2022-09-08T11:15:00"/>
      <trafficElement xsi:type="PLOCTraffic" pril="4963" secl="4962" fprg="274.89215" tprg="330.15308" sped="59.323" fore="-900" flow="1861.371" dens="31.377" time="14.568" iflw="1829.788018664607" oflw="1842.6963931149003" ouca="3600.0" quel="0.0" quen="0.0" esta="0" nveh="7.906952043892804" stor="82.092" queu="0.0" ista="0" baseSpeed="70.0" startTime="2022-09-08T11:00:00" endTime="2022-09-08T11:15:00"/>
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