[GIS] Google Maps API v3 vs v2 (JavaScript): overlay problems

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I have been using the Gmap API (v2) for dynamically displaying some data:

oMap.map = new GMap2(document.getElementById("map"));   
oMap.geoXml = new GGeoXml('http://darudar.org/var/files/workaroud/gmap/data.php?num=30');

I changed to v3 of the API, using the following code:

var georssLayer = new google.maps.KmlLayer('http://darudar.org/var/files/workaroud/gmap/data.php?num=30');
georssLayer.setMap(oMap.map);

Unfortunately, after the change the data markers do not show correctly or do not show at all. With v2, zooming and scaling allows a kml layer to get a BBOX array and to redraw the markers correctly. Does anyone know how to recreate this functionality with v3 of the API ?

PS: Sorry for my eng…

Best Answer

Works in Google Maps - it takes Google a few seconds to parse the KML and overlay it. Your script might need a time count 3-5 seconds - or will display nothing.

See it here http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=http:%2F%2Fdarudar.org%2Fvar%2Ffiles%2Fworkaroud%2Fgmap%2Fdata.php%3Fnum%3D30&sll=37.0625,-95.677068&sspn=42.174768,79.013672&ie=UTF8&ll=57.231503,41.220703&spn=29.32517,79.013672&z=4

(wait 5 seconds for Google Servers to parse the kml data)

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[GIS] Google Maps API v.2 to v.3 conversion

In http://www.zolnai.ca/WMS/whereintheworldV3.htm you are missing the following:

Proper reference to the google maps api library. From v3 there is no need for an api key so the reference would look like this:
```
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
```
There is no need for "new google.maps.Icon". You can simply use gicons["pink"]="0pink_Marker.PNG";
"new google.maps.Marker(point, gicons[icontype]);" is completely wrong syntax in v3. The right way of defining your marker would be: "new google.maps.Marker({position:point, icons:gicons[icontype]});" That is because in v3, the marker object requires a list of options in a javascript object literal, which in your case is: {position:point,icon:gicons[icontype]}

I am watching the code right now but it seems to me your code is a perfect mixture ofthe two versions. I recommend you checking the v3 api and picking it up!

[GIS] From pdf to google maps overlay

There are quite a lot of options, so I'll present a few generic ones:

Full Stack

Probably the most effort with the steepest learning curve. Store your data in some sort of database (typically PostGIS, but possibly SpatiaLite), use a middleware mapping server (like GeoServer or MapServer) to serve out a WFS which can be overlaid with Google maps using the Google Maps API. From a technical perspective there's no technical reason you have to use Google Maps here - OpenStreetMaps or Bing or even OrdnanceSurvey OpenSpace could be used. The following resources may be helpful here:

I think pretty much all of the stack is operating system agnostic so should work on OSX.

KML

Convert your areas to KML, style them as desired, put them on a public web-server somewhere then use the Google Maps API (or whichever you go with) to show your data. I don't know much about KML creation/conversion but some searching should get you far.

Google Fusion Tables

Pretty much as the title suggests, use Google Fusion Tables. I don't know much about it so can only give a basic pointer, you may have to use this in combination with the KML one, but its designed for data visualisation and can come up with some very pretty stuff.

http://www.google.com/fusiontables/Home/

Note - If you are going to use Google Maps, they do cost money after a certain number of impressions.

Best Answer

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