[GIS] What do the parameters for Google Streetview mean

google mapsgoogle-street-viewweb-mapping

I've noticed that the new Google Streetview uses a url of the following structure:

https://www.google.com/maps/place/London/@51.508506,-0.125532,3a,90y,72h,90t/data=!3m4!1e1!3m2!1s-KZZeMFtZx0aq3L0MLqE-A!2e0!4m2!3m1!1s0x47d8a00baf21de75:0x52963a5addd52a99

Specifically, there is a string like this @51.508506,-0.125532,3a,90y,72h,90t

I understand lat/lon/heading (I think) but I'm unclear on zoom and tilt. I think it could be structured like this:

@51.508506 -> lon
-0.125532 -> lat 
3a -> zoom? 
90y -> tilt 
72h -> heading (measured from North)
90t -> ?

Are there any references to these parameters, anywhere? I can't quite figure out the zoom parameter, as well as the 90t

Best Answer

I've been working on this myself. Through trial and error I figured out the following:

@51.508506, -0.125532 -> location
3a -> zoom? 
90y -> Field of View 
72h -> Heading (measured from North)
90t -> Pitch
data -> unknown

Therefore from this street view you will get this:

https://maps.googleapis.com/maps/api/streetview?size=200x200&location=51.507114,-0.12743&fov=75&heading=329&pitch=1 enter image description here

The big question is what does the data attribute equate to. Or how we can (if possible) translate it into a pano attribute (because you cannot get a Photo Sphere image without it)

Edit: I recently asked this question in a similar vein on Stack Overflow and answered my own question.

I think I figured out the pano attribute.

From said answer:

The data attribute is the interesting one. This blog article helped me figure it out.

Each segment of the attribute is preceded by "!", a number from 1 - 5 (or more presumably), and a letter (m, e, etc).

For some reason the fourth element (3rd, when counting from 0) is the pano attribute.

Therefore, this street view of the Acropolis can be parsed into this url for an image:

https://maps.googleapis.com/maps/api/streetview?size=200x200&location=37.971822,23.726532&fov=75&heading=163.13&pitch=7.599999999999994&pano=fPhZjlaq_sAAAAQYNw-Ypw

enter image description here

I'm not sure what the other attributes pertain to, but I'd like to know.

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[GIS] Link to google maps ignores url parameters for streetview

For Mobile Devices (that don't support normal web browsing option)

You will need to find the PanID by Lat/Lng

This is possible and here is an example of it:

Official (via the API) the url is http://maps.googleapis.com/maps/api/streetview?

http://maps.googleapis.com/maps/api/streetview?size=600x300&location=58.819625,5.75462&heading=250&fov=90&pitch=-10&sensor=false gets the actual image not metadata

This still works to get the metadata

http://cbk0.google.com/cbk?output=xml&ll=58.819625,5.75462

http://cbk0.google.com/cbk?output=xml&ll=58.819625,5.75462

returns in xml:

    <panorama><data_properties image_width="13312" image_height="6656" tile_width="512" tile_height="512" image_date="2010-08" pano_id="_dexjqha6c6zUEQ1PQeaFw" num_zoom_levels="3" lat="58.819625" lng="5.754620" original_lat="58.819646" original_lng="5.754602"><copyright>© 2012 Google</copyright><text>Kruneli</text><region>Sandnes, Rogaland</region><country>Norway</country></data_properties><projection_properties projection_type="spherical" pano_yaw_deg="214.6" tilt_yaw_deg="-104.6" tilt_pitch_deg="5.97"/><annotation_properties><link yaw_deg="32.12" pano_id="I8DY9jG5FZhsGpxYsL1VJA" road_argb="0x80ffffff" scene="0"><link_text>Krunehagen / Kruneli / Krunemyr</link_text></link><link yaw_deg="211.83" pano_id="f8cBtSWUvOwFcupKJNrYMw" road_argb="0x80ffffff" scene="0"><link_text>Kruneli</link_text></link></annotation_properties></panorama>

You can then use this information in a script to gain the location of each PanID streeview image of for the mobile device.

For reference: https://developers.google.com/maps/documentation/javascript/reference#StreetViewService

[GIS] Google Streetview API overlays

Geometries especially polygons will be are to place in Streetview mode (Earth API would be better).

But Images can be overlayed into streetview

This simple demo shows how to display an image overlay over a streetview and sync its movement (approximately) as the street view POV (point of view) changes

This source is available from 'http://teammaps.com/'

http://projects.teammaps.com/projects/streetviewoverlay/streetviewoverlay.htm

var svo = null;

// the main application object
function SVO()
{
    // Trafalgar Square
    this.lat = 51.507768;
    this.lng = -0.127957;
    this.zoom = 16;

    this.slat = 51.507527;
    this.slng = -0.128652;

    this.image = "img/slidecat.gif";

    this.pt = new google.maps.LatLng(this.lat, this.lng);
    this.streetPt = new google.maps.LatLng(this.slat, this.slng);

    // initial POV
    this.sheading = 69.58;
    this.spitch = 0;
    this.szoom = 1;

    this.distance = 0;  // distance in metres from street view to marker
    this.maximumDistance = 200;     // distance beyond which marker is hidden

    // dimensions of street view container (fixed)
    this.panWidth = 480;
    this.panHeight = 480;

    // dimensions of marker container (resized according to current pov)
    this.markerWidth = 120;
    this.markerHeight = 80;
}


// create map
SVO.prototype.m_initMap = function ()
{
    var mapDiv = eid("mapDiv");

    var mapOptions =
    {
        center: this.pt,
        zoom: this.zoom,
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        scaleControl: true,
        mapTypeControl: false
    };

    map = new google.maps.Map(mapDiv, mapOptions);
}


// create street view
SVO.prototype.m_initPanorama = function ()
{
    var visible = false;
    var l_panDiv = eid("panDiv");

    // controls can be hidden here to prevent the position being changed by the user
    var l_panOptions =
    {
        // zoomControl: false,
        // linksControl: false
    };

    l_panOptions.position = this.streetPt;
    l_panOptions.pov =
    {
        heading: this.sheading,
        pitch: this.spitch,
        zoom: this.szoom
    };

    pan = new google.maps.StreetViewPanorama(l_panDiv, l_panOptions);

    map.setStreetView(pan);

    // event handlers    
    google.maps.event.addListener(pan, 'pov_changed', function ()
    {
        svo.m_updateMarker();
    });

    google.maps.event.addListener(pan, 'zoom_changed', function ()
    {
        svo.m_updateMarker();
    });

    google.maps.event.addListener(pan, 'position_changed', function ()
    {
        svo.streetPt = pan.getPosition();
        map.setCenter(svo.streetPt);

        svo.m_updateMarker();
    });

}




function Marker(p_name, p_icon, p)
{
    this.m_icon = "";

    this.pt = null;
    this.m_pov = null;

    this.m_pixelpt = null;
}

// convert the current heading and pitch (degrees) into pixel coordinates
SVO.prototype.m_convertPointProjection = function (p_pov, p_zoom)
{
    var l_fovAngleHorizontal = 90 / p_zoom;
    var l_fovAngleVertical = 90 / p_zoom;

    var l_midX = this.panWidth / 2;
    var l_midY = this.panHeight / 2;

    var l_diffHeading = this.sheading - p_pov.heading;
    l_diffHeading = normalizeAngle(l_diffHeading);
    l_diffHeading /= l_fovAngleHorizontal;

    var l_diffPitch = (p_pov.pitch - this.spitch) / l_fovAngleVertical;

    var x = l_midX + l_diffHeading * this.panWidth;
    var y = l_midY + l_diffPitch * this.panHeight;

    var l_point = new google.maps.Point(x, y);

    return l_point;
}

// create the 'marker' (a div containing an image which can be clicked)
SVO.prototype.m_initMarker = function ()
{
    var l_markerDiv = eid("markerDiv");
    l_markerDiv.style.width = this.markerWidth + "px";
    l_markerDiv.style.height = this.markerHeight + "px";

    var l_iconDiv = eid("markerDiv");
    l_iconDiv.innerHTML = "<img src='" + this.image + "' width='100%' height='100%' alt='' />";

    this.m_updateMarker();
}

SVO.prototype.m_updateMarker = function ()
{
    var l_pov = pan.getPov();
    if (l_pov)
    {
        var l_zoom = pan.getZoom();

        // scale according to street view zoom level
        var l_adjustedZoom = Math.pow(2, l_zoom) / 2;


        // recalulate icon heading and pitch now
        this.sheading = google.maps.geometry.spherical.computeHeading(this.streetPt, this.pt)
        this.distance = google.maps.geometry.spherical.computeDistanceBetween(this.streetPt, this.pt);

        var l_pixelPoint = this.m_convertPointProjection(l_pov, l_adjustedZoom);

        var l_markerDiv = eid("markerDiv");


        var l_distanceScale = 50 / this.distance;
        l_adjustedZoom = l_adjustedZoom * l_distanceScale;

        // _TODO scale marker according to distance from view point to marker 
        // beyond maximum range a marker will not be visible

        // apply position and size to the marker div
        var wd = this.markerWidth * l_adjustedZoom;
        var ht = this.markerHeight * l_adjustedZoom;

        var x = l_pixelPoint.x - Math.floor(wd / 2);
        var y = l_pixelPoint.y - Math.floor(ht / 2);

        l_markerDiv.style.display = "block";
        l_markerDiv.style.left = x + "px";
        l_markerDiv.style.top = y + "px";
        l_markerDiv.style.width = wd + "px";
        l_markerDiv.style.height = ht + "px";


        // hide marker when its beyond the maximum distance
        l_markerDiv.style.display = this.distance < this.maximumDistance ? "block" : "none";
        // glog("distance = " + Math.floor(this.distance) + " m (" + l_markerDiv.style.display + ") distance scale = " + l_distanceScale + " l_adjustedZoom = " + l_adjustedZoom);

        eid("markerInfo").innerHTML = "lat: " + formatFloat(this.streetPt.lat(), 6) + " lng: " + formatFloat(this.streetPt.lng(), 6) + " distance: " + Math.floor(this.distance) + " m";
    }
}

// display a message when the user clicks on the marker's div
function markerClick()
{
    eid("markerInfo").innerHTML = "<h2>Meow !!!</h2>";
}



function loadPage()
{
    svo = new SVO();
    svo.m_initMap();
    svo.m_initPanorama();
    svo.m_initMarker();
}


// utils
function eid(id)
{
    return document.getElementById(id);
}

function glog(a)
{
    if (typeof (console) != "undefined" && console && console.log)
    {
        console.log(a);
    }
}


function formatFloat(n, d)
{
    var m = Math.pow(10, d);
    return Math.round(n * m, 10) / m;
}


function normalizeAngle(a)
{

    while (a > 180)
    {
        a -= 360;
    }

    while (a < -180)
    {
        a += 360;
    }

    return a;
}

Best Answer

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