RoadMapisanopensource(GPL)programthatprovidesacarnavigationforLinux,UNIXandnowWindowsCE(a.k.a.PocketPC).Itdisplaysamapofthestreets,tracksthepositionprovidedbyaNMEA-compliantGPSreceiver,identifiesthestreetmatchingthisGPSpositionandannouncesthenameofthecrossingstreetatthenextintersection.ArudimentarytripfeatureallowsRoadMaptodisplaysomebasicnavigationinformation(distancetothedestination,direction,speed,etc..).Voicemessagesaregeneratedthatduplicatesomeofthescreeninformation.
Itispossibletodisplayaspecificareabyprovidinga(completeorincomplete)postaladdress,theintersectionoftwostreetsoranexactposition(longitude/latitude).
ThemapfilesusedbyRoadMaparegeneratedfromtheTIGERfilesprovidedbytheUSCensusBureau,andthuscovertheUSAonly.TheRoadMapmapformatisabinaryformatthatissensitivetotheendiannessoftheprocessor.MapsavailableonthissitecoveralltheUSAandhavebeengeneratedforalittleendianprocessor(suchastheIntelPentiumandStrongARMprocessors).
RoadMaphasbeendesignedtobeusableonbothadesktoporlaptopPC,oronaPDAsuchastheiPAQfromHP(formelyfromCOMPAQ).ItcanuseeithertheGtk1.2,Gtk2.0orQTgraphiclibraryforitsuserinterface.TheQtinterfacesupportstheSharp'sZaurusPDA.Allthesemachinessharethesameendiannessandcanusethemapsprovidedonthissite.
RoadMapisatanearlystageofdevelopment.Atthistimetherearenoroutingfeaturesimplementedyet.Theplanforthefutureistoimplementsomenavigationfeaturessimilartothosefoundincommercialstreetnavigationsystems.ThemainlimitforimplementingroutingisthelackofnavigationinformationintheUSCensusBureaudatabase(forexampleone-waystreetarenotindicated).TheUSCensusBureauhasclearlyindicatedthatitdoesnotplantoaddtheseinformationinthefuture(theUSCBdoesnotneedthem).
RoadMapusesgpsdfortheGPSlinkandflite(festivallite)forthevoicemessages.Notethatflitecanberebuiltwithbettervoicesthanthedefaultone(suchasaUSvoiceinsteadofabritishone--somemaydisagree.SeethefliteREADMEformoreinformation.Hereisanexample,courtesyofScotWilcoxon:
cdflite
makeclean #toremoveoldexecutablefiles
./configure--with-vox=cmu_us_kal16
RoadMapcomeswithitsownGPSstatusscreen,whichprovidesanoverviewofthesatellitesreceivedandhighlightsthosetheGPShasafixon.ThisstatusscreenallowsforplacingtheGPSdeviceinapositionthatoptimizessatellitereception,evenifthatmeansmakingtheGPSdevice'sscreennotaccessible.
RoadMapusesabinaryfileformatforrepresentingthemapsthatiscompactenoughtoallowthestorageofmanymapsonaCompactFlashorMultiMediacard.Forexample,themapofLosAngelescountytakesabout10Mbytesofflashspace.RoadMapcomeswithasetoftoolstoconverttheUSCensusbureaudata(boththe2000and2002versions)intoitsownmapformat.FutureversionsoftheUSCensusbureaudatawillbesupportedaswell(usuallya1or2monthsafterthedatahasbeenreleased).
WhenRoadMapstarts,itdisplaysamapofthesameareathatwasdisplayedonthelatestsession.Clickingonthemapscreentriggersa"sign"thatdisplaysthenameofthestreet,roadorfreeway(ifany)thatistheclosesttothemousehotpoint.
(责任编辑：admin) |