Well I have run into a bit of a small problem and I am not sure how to approach this. I have this test map.
http://www.mesquiteweather.net/googlemap_poly.html
Which creates polygons based on data from this XML file.
http://www.mesquiteweather.net/xml/warnings.xml
It displays weather alerts/watches/warnings etc on the map from the data which makes the polygon that shows what area the alert is in and I have an array in another file that assigns the color. All that works great.
Here is my problem. The XML feed doesn't always display alerts with polygon cords that can be split to create latlng object to create the polygons, I will only get county names half the time so there may be alerts in the feed but they will never get displayed if there is no polygon cords. If you look at the feed for cap:polygon you'll see not all of them have it. Right above it though is areaDesc which is the county name. So is there an easy way to create a polygon base on the county name from that data and how?
I have been searching the web with no results. I did read about fusion tables but will that work and can I use that to draw the polygons based on the data from the feed then have fusion tables draw it out? I don't know, I am doing stuff with Google Maps I have never done before so I am out of my element and could use some guidance and assistance. Any suggestions or advice would be greatly welcomed so I can put this project to sleep.
-Thanks
You can use FusionTables to display a FusionTablesLayer with specific counties on it, and style those polygons dynamically (with up to 5 style rules).
FusionTable containing US counties
Selected counties
Example that displays the counties (using a FusionTablesLayer) on the map
Proof of concept, not sure this will be usable with this many counties.
Probably OK with a small number of counties (your original example)
Related
I have a dataset with several hundred thousand lat/long points. I would like to render these points on a map for info-graphic purposes (as small dots or something similar).
This is not something that necessarily has to be interactive, or rendered in a browser. It's okay if it's just an image.
I know that attempting this with markers and Google maps would be tough... any other tools out there that would generate this type of map? Preferably free/open source?
Or, do you have a method to make this work with something like Google maps? I don't want to use a marker clusterer... I need to be able to see all of the points.
In short :)
Download and fire-up Quantum GIS
Add some background map (e.g. OSM WMS layer from http://129.206.228.72/cached/osm)
Have your data in a CSV file, in WKT format, and load it on top (using add delimited text layer)
Save as image
You might want to peek what stackexchange.com has on GIS, too.
I have a table with a year's worth of wind data for a specific latitude longitude. I want to plot this as an arrow in Google Maps. Each data point has a timestamp, heading (true), and magnitude (knots), but it is just contained in a spreadsheet.
I was thinking the easiest way is to just create a new layer using geoJSON data, but I've never used geoJSON before.
How can I plot this in Google Map api v3? Thanks!
EDIT:
I did some research, and I think the best way is to just place a marker over the lat long point, and generate a ton of arrow images (probably in 5 degree and .5 knot increments, so I don't have a million images). Then just title each arrow based on its parameters (something like 01030.png, where 010 is the direction and 30 stands for 3.0 knots) and when the script calls for the marker image, just include those attributes when it calls for the image name.
I'll post the code when I make it, so other people can see.
The question is pretty descriptive.
I am working on a website that provides locations for filming.
All the data in the site is currently stored in a MySQL database including geocode data for google maps.
I need to show polygon areas for the different london boroughs that has locations.
I have all the data as kml files, idealy i would like to store this in the MySQL database.
I have had success using fusion tables to display this data, but it seems silly to me to have to have this data duplicated on google just to use a fusion map layer, can i simply use a kml layer to render this data rather than having to create a fusion table and rendering it from that?
If so, is there a resource someone could point me to for more information?
UPDATE:
Thank you for the responses so far, i thought i would update the question with a little more info .
I eventually want to have all the areas displayed at the same time on my map and then when an area is clicked on ideally it would take you to another page on the website showing locations for that specific area.
I had initially tried using KML layers but i was getting errors saying my KML was invalid.
The KML was initially stored in a field in my database table, i think probably the errors were due to me not understanding exactly how google read in the KML data.
Using polygons would be far simpler to implement as i can get this data via JSON and then render the polygons from that.
I know now its not possible to have info windows with polygons, but i would just prefer to jump directly to another website page with info for that particular area using a click handler rather than show an info window.
Alternatively as suggested showing a tool-tip with a brief description of the area and a link to the page would be better, how the tooltip itself, is it possible to render on top the map?
I am slightly worried that I will reach the layer limit for the KML.
Is it possible to have multiple polygons rendered with KML on one layer, or do i need a separate layer for each clickable area?
The Google Maps API provides a pretty straightforward method to draw polygons.
Basic Example:
var polygon = new google.maps.Polygon({
map: your_google_map_instance,
paths: array_of_latlng_points,
fillColor: "#336699",
fillOpacity: .5,
})
EDIT: For this approach, you would need to parse your KML files (sorry, must've missed that when I first read it). You can import the KML files to a KML layer
You can overlay Polygons using KmlLayer, FusionTablesLayer (as you know), or native google.maps.Polygon objects.
KmlLayer and FusionTablesLayer render them as tiles, so for lots of Polygons (if you only need click events) will be more efficient. There are limitations on the number of KmlLayers that can be displayed on the map at one time and on FusionTablesLayer (but those don't seem to be causing you problems).
There are also third party parsers available for KML (geoxml3, geoxml-v3) which will take your KML and render it as native google.maps.Polygon objects. For lots of Polygons, this will be less efficient than tile based rendering, but it does allow mouseover/mouseout, and changing the properties of the Polygons dynamically.
You could also try data layers what have lots of events so you can display tooltips, info window, status text on various mouse events.
See samples in documentation:
https://developers.google.com/maps/documentation/javascript/datalayer
If you have many polygons (where the actual value of many depends on multiple factors, can be anywhere between 100 and 1,000) the best is to use a built in layer type. The fastest are the ones rendered on server, e.g. kml layer because this doesn't create hundreds of DOM elements in browser but still exposes click events so infoboxes can be displayed for each item.
In the worst case you can implement your own rendering with an image map, obviously by using an existing library like mapnik.
https://developers.google.com/maps/documentation/javascript/maptypes#ImageMapTypes
I have created a map using the Google Maps API v3.
I have created a Fusion Table with a hundred locations (markers) or so and have that successfully pulling into my map.
Now I need to add a search box to this page that will allow the user to enter their zip code and have the map zoom in to that area, then only seeing the locations in that zip code or the nearest locations to that zip code. I would also like the location data to pull into a sidebar as seen with the now deprecated Local Search API.
I have read most (if not all) of the posts that seemed to be about this, but to no luck. I feel like this shouldn't be that difficult really, I mean Google does search primarily right? Yet adding a search bar to my custom map is such a difficult task.
Any help would be appreciated, I have a deadline of tomorrow. Thanks everyone, I love it here.
Ryan
You will need to geocode the zip code and use the results to center the map, then show the markers that fit the bounds of the map if they are not already shown.
See http://code.google.com/apis/maps/documentation/javascript/geocoding.html
There is an example with a search box.
I'm looking looking for a tool that will allow me to make a map exactly like this:
http://datasearch.uts.edu.au/about/mapsdirections/map.cfm
Basically I need to put shapes around buildings in the satellite view and then slap a marker and information window on them so that I can specify the building name and contents.
So the main issue is that I need the ability to draw shapes directly onto the maps as I don't fancy taking down the lat lng of each corner of the polygon.
Ideally what I'd like to do is have an online application that exports those points to KML, and then I would display google maps on my site and import that kml to display it.
Other suggestions welcome!
Jason
Found a polygon creator
http://www.the-di-lab.com/polygon/
It's simple to use and allows you to copy and paste straight into your code. Would be nice if it had a button that said sent to kml though..