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Home > Programming > Geospatial Analysis > OpenLayers Cookbook
OpenLayers Cookbook
OpenLayers Cookbook

OpenLayers Cookbook: The best method to learn the many ways OpenLayers can be used to render data on maps is to dive straight into these recipes. With a mix of basic and advanced techniques, it's ideal for JavaScript novices and experts alike.

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OpenLayers Cookbook

Chapter 2. Adding Raster Layers

In this chapter we will cover the following:

  • Using Google Maps imagery

  • Using Bing imagery

  • Adding WMS layer

  • Wrapping the date line options

  • Changing the zoom effect

  • Changing the layer opacity

  • Using WMS with single tile mode

  • Buffering the layer data to improve the map navigation

  • Creating an image layer

  • Setting the tile size in WMS layers

Introduction

This chapter is all about working with raster layers. We have tried to summarize, with a set of recipes, the most common and important use cases you can find day-to-day when working with OpenLayers.

Imagery is one of the most important kinds of data to work with in a GIS system.

OpenLayers offers several classes to integrate with different imagery providers, from proprietary providers such as Google Maps and Bing Maps, to Open Source ones such as OpenStreetMap or even any WMS service provider.

The base class for any layer type is the OpenLayers.Layer class, which offers a set of common properties and defines the common behavior for any other classes.

In addition, many layers inherit from the OpenLayers.Layer.Grid class, which divides the layer into zoom levels. This way each zoom level covers the same area but uses a greater set of tiles. For example, at level zero a grid with one tile covers the whole world, at level one a grid with four tiles covers the whole world, and so on...

Using Google Maps imagery

Google Maps is probably the most known web map application around the world. Their imageries, in the way of tiled layers, are well known by people; they are accustomed to their layer style and because of this you may be interested in using them in your own web mapping project.

OpenLayers counts with the OpenLayers.Layer.Google class, which is in fact a wrapper code around the Google Maps API, that allows us to use the Google Maps tiles in a homogeneous way within the OpenLayers API.

Note

Do not confuse Google Maps API with the Google Maps imagery. Google Maps API is a bunch of JavaScript code, which is free to use, while the access to the Google Maps imagery has some usage restrictions and, depending on the number of hits, will be subject to some payments.

How to do it...

To use Google Maps imagery, perform the following steps:

  1. Create an HTML file and add the OpenLayers dependencies.

  2. Include the Google Maps API as follows:

    <script type="text/javascript" src="http://maps...

Using Bing imagery

Bing Maps, previously known as Virtual Earth, is the mapping service provided by Microsoft.

In the same way as Google Maps, OpenLayers offers an OpenLayers.Layer.Bing class, which brings us the possibility to add Bing imagery in our projects.

Getting ready

Bing Maps requires you to register as a consumer user. Once registered, you will get an API key needed to initialize the OpenLayers.Layer.Bing layer and that will be used with every request to authenticate you against the Bing Maps service.

Opposite to Google Maps, Bing does not require any JavaScript code and the OpenLayers.Layer.Bing class does not act as a wrapper. Bing Maps offer a REST service to directly access tiles using your API key.

Note

You can find out how to register as a user at http://msdn.microsoft.com/en-us/library/ff428642.aspx.

In addition you can learn about Bing Maps REST Services at http://msdn.microsoft.com/en-us/library/ff701713.aspx.

At this point, it is assumed that you have an API key to be used...

Adding WMS layer

Web Map Service (WMS),is a standard developed by the Open Geospatial Consortium (OGC) implemented by many geospatial servers, among which we can find the free and open source projects GeoServer (http://geoserver.org) and MapServer (http://mapserver.org). More information on WMS can be found at http://en.wikipedia.org/wiki/Web_Map_Service.

As a very basic summary, you can understand a WMS server as a normal HTTP web server that accepts request with some GIS-related parameters (such as projection, bounding box, and so on) and returns a map similar to the following screenshot:

Note

We are going to work with remote WMS servers, so it is not necessary you have one installed. As an advise, note that we are not responsible for these servers and that they may have problems, or are not available when you read this section.

Any other WMS server can be used, but the URL and layer name must be known.

How to do it...

To add a WMS layer, perform the following steps:

  1. Create an HTML file and...

Wrapping the date line options

There might be situations where you do not want your map ends at -180 or +180 longitude degrees as you are working in that area and need a continuous map. For example, imagine a map where on the left you can see the end of Russia and at the right Alaska, as shown in the following screenshot:

This property is a common attribute from base class OpenLayers.Layer and is called the wrapDateLine.

How to do it...

To wrap the date line options, perform the following steps:

  1. Create an HTML file and add the OpenLayers dependency.

  2. In the beginning, we have put a checkbox to activate/deactivate the wrap data line feature, as follows:

    Wrap date line: <input dojoType="dijit.form.CheckBox" checked onChange="wrapDateLine" /> <br/>

    Note

    Do not worry about the dojoType="dijit.form.CheckBox" attribute, it is because the Dojo Toolkit (http://dojotoolkit.org) is used in the sample.

    Think of it as a normal HTML input element.

  3. Next, we have added the DOM element used to render the...

Changing the zoom effect

The panning and zoom effects are very important actions related to the user navigation experience.

In Chapter 1, Web Mapping Basics, the recipe Moving around the map view shows how you can control and create the way the map can be panned.

In the same way you can control the transition effect between two zoom levels on the layers.

The OpenLayers.Layer class has a transitionEffect property, which determines the effect applied to the layer when the zoom level is changed. For the moment only two values are allowed: null and resize.

The null value means no transition effect will be applied, because when you change the zoom level you probably see how the layer disappears until the tiles at the new zoom level are loaded.

With the resize value when we zoom into a level, the current tiles are resized, adapting to the new zoom, until the tiles at the new level are loaded in background. This way images are always visible and we avoid the ugly effect of seeing a blank map for...

Changing the layer opacity

When you are working with many layers—both raster and vector layers—you will probably find situations where a layer that is on top of another layer hides the one below it. This is more common when working with raster WMS layers without the transparent property set to true or tiled layers such as, OpenStreetMaps, Google, and Bing. The layer opacity is set to 50% in the following screenshot:

The OpenLayers.Layer base class has an opacity property, implemented by concrete subclasses, that allows us to modify the opacity of the layers. It is a float value that can range from 0.0 (completely transparent) to 1.0 (completely opaque).

How to do it...

The opacity of the layers can be changed. To change the opacity of the layer, perform the following steps:

  1. Create an HTML file adding the required OpenLayers dependencies.

    Note

    We have intentionally omitted the HTML code required for the slider control. Here, we have focused on the code for OpenLayers. If interested in knowing...

Using WMS with single tile mode

Web Map Service (WMS) is a protocol to serve georeferenced map images.

The basic idea is that, given a bounding box and some other parameters, such as a layer name, the client makes an HTTP request to the WMS server, which computes and returns an image with all the data for the specified layers and within the specified bounding box.

In OpenLayers, when you add a WMS layer to your map, the OpenLayers.Layer.WMS instance is provided with some parameters, such as resolutions and tile size. The WMS server computes the right number of tiles for each zoom level and divides the layer in that number of tiles.

This way, when you add a WMS layer to the map, there is not only one request to the server, but one by each tile that forms the current zoom level.

Note

Dividing the WMS layer in tiles can be better from the server-side point of view when it is configured with a cache system. This way tiles are generated once and served many times.

If you have more than one web mapping...

Buffering the layer data to improve the map navigation

Map navigation is an important factor to take into account to make the user experience better.

When we pan the map, many times we get to see blank areas (meaning that the content is loading) and after a few seconds the image appears.

On gridded layers and WMS layers working in single tile mode, we can improve this at the cost of increasing the requests number or increasing the computation time at the server side.

Note

Most of the raster layers inherit from the base class OpenLayers.Layer.Grid, which is responsible for dividing each zoom level into tiles.

For WMS layers working in single tile mode, the grid is formed only by one tile, which fills the whole map view.

The idea behind improving map navigation is simple; load the tiles outside the map view so that they are loaded before the user pans the map view in that direction.

This recipe shows you how to preload content outside the map view, both for gridded layers and also for WMS layers...

Creating an image layer

Sometimes a tiled layer, such as Google Maps, OpenStreetMap, or WMS, is not what you need. It is quite possible that you have a georeferenced image, knowing its projection and bounding box, and want to render it on the map.

In these cases, OpenLayers offers the OpenLayers.Layer.Image class that allows us to create a layer based on a simple image. A georeferenced image is shown in the following screenshot:

How to do it...

To create an image layer, perform the following steps:

  1. Let's go and create an HTML file with the OpenLayers dependencies.

  2. First, add the div element that will hold the map, as follows:

    <!-- Map DOM element -->
<div id="ch2_image" style="width: 100%; height: 100%;"></div>

  3. Next, initialize the map and add a WMS base layer, as follows:

    <!-- The magic comes here -->
<script type="text/javascript">
    // Create the map using the specified DOM element
    var map = new OpenLayers.Map("ch2_image", {
        allOverlays: true
  ...

Setting the tile size in WMS layers

The OpenLayers.Layer.Grid class is a special kind of layer, which divides the layer in different zoom levels composed of a grid of tiles.

The OpenLayers.Layer.WMS class is a subclass of the preceding one and, in addition to working in single tile mode, it can work in tiled mode as well.

Of course, controlling the size of the tiles of the WMS request can affect the performance. By default, the tile size is 256 x 256 pixels, but we can set this to any desired value. Bigger tile sizes means less request to the server but more computation time to generate a bigger image. On the contrary, smaller tile sizes means more server requests and less time to compute smaller images.

How to do it...

To set the tile size, perform the following steps:

  1. Create an HTML file with OpenLayers library dependency.

  2. Add a div element that will hold the map, as follows:

    <!-- Map DOM element -->
<div id="ch2_tilesize" style="width: 100%; height: 100%;"></div>

  3. Next, initialize...

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Page 1 of 12

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Key benefits

  • Understand the main concepts about maps, layers, controls, protocols, events etc
  • Learn about the important tile providers and WMS servers
  • Packed with code examples and screenshots for practical, easy learning

Description

Data visualization and analysis has become an important task for many companies. Understanding the basic concepts of GIS and knowing how to visualize data on a map is a required ability for many professionals today. OpenLayers is a JavaScript library to load, display, and render maps from multiple sources on web pages."OpenLayers Cookbook" teaches how to work with OpenLayers, one of the most important and complete open source JavaScript libraries.Through an extensive set of recipes, this book shows how to work with the main concepts required to build a GIS web applicationñ maps, raster and vector layers, styling, theming, and so on."OpenLayers Cookbook" includes problem solving and how-to recipes for the most common and important tasks. A wide range of topics are covered.The range of recipes includes: creating basic maps, working with raster and vector layers, understanding events and working with main controls, reading features from different data sources, styling features, and understanding the underlying architecture."OpenLayers Cookbook" describes solutions and optimizations to problems commonly found.

Who is this book for?

If you are a GIS-related professional with some basic knowledge of web technologies and want to start or gain in-depth knowledge of creating web mapping applications, this book is written for you The recipes are appropriately mixed to suit JavaScript newbies or experts and cover basic to advanced topics on OpenLayers.

What you will learn

  • Create maps, understand projection and other important properties
  • Add raster and vector layers
  • Work with important tile providers
  • Work with OGCs WMS and WFS compliant servers
  • Read/write features from/to different data sources
  • Style features to improve their visualization
  • Understand events and work with the main controls
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Publication date : Aug 24, 2012
Length: 300 pages
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Language : English
ISBN-13 : 9781849517843
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Length: 300 pages
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Language : English
ISBN-13 : 9781849517843
Vendor :
OpenLayers
Category :
Programming
Languages :
JavaScript
Concepts :
Geospatial Analysis
Tools :
OpenLayers

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Table of Contents

8 Chapters
Web Mapping Basics Chevron down icon Chevron up icon
Web Mapping Basics
Introduction
Creating a simple full screen map
Different ways to include OpenLayers
Understanding base and non-base layers
Avoiding the need of a base layer
Playing with the map's options
Managing map's stack layers
Managing map's controls
Moving around the map view
Restricting the map extent
Adding Raster Layers Chevron down icon Chevron up icon
Adding Raster Layers
Introduction
Using Google Maps imagery
Using Bing imagery
Adding WMS layer
Wrapping the date line options
Changing the zoom effect
Changing the layer opacity
Using WMS with single tile mode
Buffering the layer data to improve the map navigation
Creating an image layer
Setting the tile size in WMS layers
Working with Vector Layers Chevron down icon Chevron up icon
Working with Vector Layers
Introduction
Adding a GML layer
Adding a KML layer
Creating features programmatically
Reading and creating features from a WKT
Adding markers to the map
Using point features as markers
Working with popups
Adding features from a WFS server
Using the cluster strategy
Filtering features in WFS requests
Reading features directly using Protocols
Working with Events Chevron down icon Chevron up icon
Working with Events
Introduction
Creating a side-by-side map comparator
Implementing a work in progress indicator for map layers
Listening for vector layer features' events
Listening for non-OpenLayers events
Adding Controls Chevron down icon Chevron up icon
Adding Controls
Introduction
Adding and removing controls
Adding a navigation history control
Working with geolocation
Placing controls outside the map
Editing features on multiple vector layers
Modifying features
Measuring distances and areas
Getting feature information from data source
Getting information from the WMS server
Theming Chevron down icon Chevron up icon
Theming
Introduction
Understanding how themes work using the img folder
Understanding how themes work using the theme folder
Delimiting tiles in a raster layer
Creating a new OpenLayers theme
Starting actions outside the controls
Styling Features Chevron down icon Chevron up icon
Styling Features
Introduction
Styling features using symbolizers
Improving style using StyleMap and the replacement of feature's attributes
Playing with StyleMap and the render intents
Working with unique value rules
Defining custom rules to style features
Styling clustered features
Beyond the Basics Chevron down icon Chevron up icon
Beyond the Basics
Introduction
Working with projections
Retrieving remote data with OpenLayers.Request
Creating a custom control
Creating a custom renderer
Selecting features intersecting with a line
Making an animation with image layers

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Mauro Barattin Feb 26, 2013
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Si tratta di un libro molto interessante e che pertanto consiglio a chi è interessato alla presentazione di dati geospaziali.
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NemoM Jun 16, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I work for a County government as the GIS (computer mapping) guy. Our County is very sparsely populated, so we don't have a large budget, but we still need to supply our residents with all that we can. I've been working on setting up web maps; parcels, timber sales, motorized and non-motorized trails, and land sales. A combination of Geoserver, OpenLayers, JavaScript, jQuery, and jQuery Mobile on a VPS running CentOS makes a wonderful map.
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Bette Lamore Sep 10, 2015
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Everything I expected.
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Carlos Bello Pauste Oct 23, 2012
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Great book! From the very beginning you can start solving common practical problems and increase your knowledge of the base concepts of OpenLayers progressively, recipe by recipe.If you have a little or no knowledge of OpenLayers and you need to start using it, or you are using OpenLayers and need to speed up your results, or simply you get bored with the technicality and want something more practical... this book is for you.Is it perfect? Of course no: I miss, for example, a recipe for reverse geocoding. However, the practical approximation of the concepts and the wide range of OpenLayers features covered, make of this one a great book.
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ElEucas Oct 16, 2012
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Excellent Book!This book provides concise examples to build OpenLayers apps in no time, covering almost every aspect of the OpenLayers API.Only needs geoext examples.
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FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela