Tag: maps

Geonetwork Mapviewer with EPSG:27700

Recently, I have been installing and configuring Geonetwork (a spatial metadata catalogue) for use at work. It can use a Geoserver installation to display maps within the user interface. By default it uses map services from across the internet but I needed/wanted to display our Ordnance Survey mapping in the viewer.  Geonetwork has a config-gui.xml file for configuring the user interface and there are two sections where the mapping can be configured.

The small map:

  <mapSearch options="{projection: 'EPSG:27700', maxExtent: new OpenLayers.Bounds(-650000, 0, 1300000, 1300000), units: 'm', restrictedExtent: new OpenLayers.Bounds(300000, 700000, 400000, 800000)}">
  <layers>
    <!--<layer server="http://localhost/geoserver/os/wms" tocName="Miniscale"  params="{layers: 'os:miniscale_std', transparent: 'true', format: 'image/png'}"  options="{}" />-->
    <layer server="http://localhost/geoserver/os/wms" tocName="OS 50K" params="{layers: 'os:os50k_opt', format: 'image/jpeg'}" options="{isBaseLayer: true, resolutions: [350,175,84,42,21,11.5,5.6,2.8,1.4,0.7]}" />
  </layers>
 </mapSearch>

The large map:

  <mapViewer options="{projection: 'EPSG:27700', maxExtent: new OpenLayers.Bounds(-650000, 0, 1300000, 1300000), units: 'm', restrictedExtent: new OpenLayers.Bounds(300000, 700000, 400000, 800000)}">
  <layers>
    <!--<layer server="http://localhost/geoserver/os/wms" tocName="Miniscale"  params="{layers: 'os:miniscale_std', transparent: 'true', format: 'image/png'}"  options="{}" />-->
    <layer server="http://localhost/geoserver/os/wms" tocName="OS 25K" params="{layers: 'os:os25k_opt', format: 'image/jpeg'}" options="{isBaseLayer: true, resolutions: [2800,1400,700,350,175,84,42,21,11.5,5.6,2.8,1.4,0.7]}" />
    <layer server="http://localhost/geoserver/os/wms" tocName="OS 50K" params="{layers: 'os:os50k_opt', format: 'image/jpeg'}" options="{isBaseLayer: true, resolutions: [2800,1400,700,350,175,84,42,21,11.5,5.6,2.8,1.4,0.7]}" />
    <layer server="http://localhost/geoserver/os/wms" tocName="OS 250K" params="{layers: 'os:os250k_opt', format: 'image/jpeg'}" options="{isBaseLayer: true, resolutions: [2800,1400,700,350,175,84,42,21,11.5,5.6,2.8,1.4,0.7]}" />
  </layers>
  <scales values="[10000000, 5000000, 2500000, 1250000, 625000, 300000, 150000, 75000, 40000, 20000, 10000, 5000, 2500]" />
  <!--<scales values="[8192, 4096, 2048, 1024, 512, 256, 128, 64, 32, 16, 8, 4, 2]" />-->
  <!--<scales values="[1763.889,352.778,176.389,88.194,35.278,26.458,17.639,8.819,3.528,1.764,0.882,0.441]" />-->
  <proj>
    <crs code="EPSG:27700" default="1" name="British National Grid" />
  </proj>  
  <servers>
    <!--<server name="NASA JPL OneEarth Web Mapping Server (WMS)" url="http://wms.jpl.nasa.gov/wms.cgi?" />
    <server name="NASA Earth Observations (NEO) WMS" url="http://neowms.sci.gsfc.nasa.gov/wms/wms?" />
    <server name="DEMIS World Map Server" url="http://www2.demis.nl/mapserver/wms.asp?" />-->
    <server name="Geoserver" url="http://localhost/geoserver/wms?" />
    <server name="eMapSite" url="http://ws.emapsite.com/view/wms/1.0/angus_council_01?" />
  </servers>
 </mapViewer>

I’m using my local geoserver to serve EPSG:27700 or British National Grid tiles and I have linked that in to my Geonetwork.

A couple of things to note here: you can have as many layers as you want and you can set the display scales.  You also need to set the WMS resolutions so that the map can be rendered at the appropriate scales.  Use the layer options to set the resolutions and adjust the scales array to match the resolutions.  I got my resolutions and scales from Geoserver where I have an EPSG:27700 gridset defined.

more notes to follow soon.

 

GeoServer WFS-T EPSG:27700

A sample page demonstrating the GeoServer WFS-T capabilities using data in British National Grid (EPSG:27700) in an OpenLayers application.  Customised from the template in the GeoServer installation.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <link rel="stylesheet" href="/openlayers/theme/default/style.css" type="text/css" />
    <style type="text/css">
        body {
            margin: 1em;
        }
        #map {
            width: 600px;
            height: 600px;
            border: 1px solid black;
        }
    </style>
    <script src="openlayers/OpenLayers.js"></script>
     Continue reading GeoServer WFS-T EPSG:27700

Embedding maps

In an effort to make more useful information available to local residents without being overly technical, part of what I have been working on is making simple maps to embed in a website.  These return some (hopefully) useful information.  There is a move away from monolithic web GIS applications that do everything to making spatial information available everywhere across a website.  These simple maps can be embedded on any page with the website.  Each map will only display information relevant to the content on the page.

Waste collection dates (custom complex map viewer)

My Location report (default complex map viewer) Continue reading Embedding maps

Unconnected black hole

According to a recent survey by the BBC, Newtyle is a veritable void of connectivity. Using Android devices to record mobile signal strength data was collected over a three week period. The resulting coverage map can be seen on the BBC site – http://www.bbc.co.uk/news/technology-14582499. If you put in a Newtyle postcode (PH12 8TU will do) you can see that the village is just about the only black spot on the map.  Do bear in mind that less than 50,000 people from across the UK took part in the survey and not many of them came from Newtyle.

mobile-coverage
mobile coverage map

Incommunicado

We’ve moved into our new house and we are in the process of updating contat details, change account information and waiting for a telephone and broadband internet connection.  While there are plenty of other things to be getting on with, you realise how dependent on instant communication you become when the only mean of communcation is putting pen to paper or actually going to see the person you wish to talk to.

I had a look at the cell network coverage for Newtyle and it appears to sit right in the eye of the 2G/3G storm.  There is zero coverage anywhere within the bounds of our property and we are lucky if we get two bars of signal outside the front gate.  The answer does appear to be blowing in the wind sometimes as the signal can vary wildly.

Here are some maps from the major providers:

Orange 3G coverage
Orange 3G coverage
T-Mobile 3G coverage
T-Mobile 3G coverage
T-Mobile 2G coverage
Orange 2G coverage
O2 2G coverage
Vodafone 2G/3G coverage
Vodafone 2G/3G coverage

Arctic Adventures

I am trying to work out how to load KMZ files to my blog to display on an embedded map.  Couple of things need to be done: one, allow KML/KMZ files to be uploaded and two, find a mapping plugin that can read the KML/KMZ files.  I am using two different Google Map plugins – XML Google Maps and Geo Mashups.  Both are supposed to read the embedded KMZ file.

The first problem is solved with the PJW Mime Config plugin. This allows you to define the file types that are allowed to be uploaded to the server.

The second problem is solved with XML Google Maps.  The XML Google Map plugin seemed to do what I wanted it to – create a separate map for each linked KML file – but there appears to be an issue with the actual map displaying [edit – due to a conflict with some other mapping plugins].

The KMZ files are being sent from Ellesmere Island, via Canmore, British Columbia, where Clive Rubens is trekking for the next eight weeks on a self-supported expedition.  The goal is to traverse the island from north to south.  To find out more read Chris and Shona’s blogs.  Wilma’s blog will have some interesting stuff too.

Clive’s updated positions on Ellesmere Island

Expense Accounts

Being a geographer means I am interested in maps.  Being a South African and living in London and having to deal with the Home Office for visas means I am interested in who my MP is.  So if I can find a map that has information about my MP then I am doubly interested.  Especially if the information is about the MP spending my money.  Use the navigation tools to find your constituency and click on the map to get a summary of your MP’s expenses in 2007/08.

MP expense accounts map

If you are not a map person then you can read a table of facts and figures.

Spatially challenged

Some people know where things are. Other people know about other things. Some people don’t know about other things. Other people may, or may not, know where places are or why they aren’t there.

Miss South Carolina is one of those other people.