Mapserver ile örnek dökümanı eklendi.
Projeksiyonu tanımlı olmayan raster imajın, projeksiyonunun tanımlanması, mapserver kullanılarak servis edilmesi, openlayers ile sunumu adım adım anlatılmıştır.

http://www.siyahsapka.org/dokuman/gis-mapserver-openlayers-application-development.html

 

 

 

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Posted on 27-04-2011
Filed Under (Geographic Information Systems) by admin

http://www.turksatglobe.com/Views/Map/SatelliteMap.aspx

Turksatglobe.com adresinde uydu görüntüleri, araç takip sistemi,  harita uygulaması bulunuyor. google kadar gelişmiş hizmetler sunulamasada böyle bir başlangıç yapılması güzel olmuş, harita uygulamaları openlayers  alt yapısı üzerinde çalışıyor.

Şehirlere göre ayırdıkları yüksek ölçekli görüntüleri satışa koymuşlar:) google, yahoo, microsoft, openstreetmaps ücretsiz olduğu sunduğu haritalar varken bu haritaları kim kullanacak bilinmez.

Google tarafından sunulan haritalar, turksatglobe un demo olarak koymuş olduğu haritalara göre daha kullanılabilir.

Turksat maps iddialı duruma gelmesi için bence öncelikle yüksek ölçekli haritaları ücretsiz sunmaları lazım, caddeler sokaklar çok eksikleri var, openlayers tercihleri doğru fakat üzerine birşeyler koyarak fark yaratmadığı sürece, ne kadar reklam yapsalarda tercih edileceğini zannetmiyorum,

 

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Posted on 17-11-2010
Filed Under (Geographic Information Systems, Web) by admin

Kml OpenGIS (http://en.wikipedia.org/wiki/Opengis) tarafından standartları belirlenen temelde XML yapısı üzerine inşa edilmiş, veri standardıdır. Veri barındırmak dışında uygulamalara özel çağrılar yapmak için ve stil tanımları için sahip olduğu etiketler kullanılır.

Google maps api, openlayers veya google earth api kullanarak geliştireceğiniz harita uygulamaları üzerinde standartlarla çalışmak istiyorsanız KML kullanabilirsiniz. Oluşturduğunuz KML dosyalarını google earth masaüstü sürümünü kullanarak da görüntüleyebilirsiniz. Google earth masaüstü sürümü kullanarak oluşturduğunuz katmanı kopyalayıp, herhangi bir metin editörüne yapıştırırsanız earth api üzerinde oluşturulan tüm katmanların aslında KML üzerine inşa edildiğini görebilirsiniz.

KML öğrenmek için code.google.com altında oluşturulan: http://code.google.com/intl/tr-TR/apis/kml/documentation/ adresini ziyaret edebilirsiniz. Google standart KML tanımları üzerine Gx: ile başlayan etikeler eklemiştir. Bu etiketler google uygulamalarına özel olarak kullanılabiliyor. Örneğin Gx:track etiketini kullanarak earth api üzerinde çizdirdiğiniz yolu takip eden bir araç uygulamasını kolaylıkla geliştirebilirsiniz.

Farklı mapping API ‘lerinin sunmuş olduğu farklı sınıf ve methodları öğrenmeye çalışmaktansa, sadece KML standardını çok iyi öğrenerek uygulamalarımızı farklı API ‘lerle kolayca entegre çalışır hale getirebiliriz.

Aşağıda basit bir KML örneği bulunuyor.

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Placemark>
    <name>Simple placemark</name>
    <description>Attached to the ground. Intelligently places itself
       at the height of the underlying terrain.</description>
    <Point>
      <coordinates>-122.0822035425683,37.42228990140251,0</coordinates>
    </Point>
  </Placemark>
</kml>

Örnekteki kodu metin düzenleme editörüne yapıştırıp, test.kml olarak kaydediniz. Google earth programı ile kml dosyasını açıp sonucu görebilirsiniz.

Dökümanı zaman buldukça örneklerle genişleteceğim,
17/11/2010, İzmir

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Posted on 07-10-2010
Filed Under (Geographic Information Systems, PHP) by admin

Google earth ile çizdiğim test yolundaki her koordinatı, belirlediğim zaman aralığıda “test amaçlı” GPS verisi geldiğini düşünerek belli zamanlara eşlemem gerekiyordu, aşağıdaki PHP kodunu inceleyebilirsiniz,

 
#
# 07/10/2010, izmir 
#Ali Okan YÜKSEL aokany@gmail.com
# 

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foreach($sArray as $k=>$v) {
	$i=$i+5;
	$next  = date("Y-m-d H:i:s", mktime(0, 0, date("s")+$i, date("m")  , date("d")+1, date("Y")));	 // hour minute seconds month day year
	print $v." >>> $next <br />";
}
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Posted on 22-08-2010
Filed Under (Geographic Information Systems) by admin

ArcGIS Server, .NET kütüphaneleriyle özelleştirebileceğiniz, ArcMap ile entegre çalışan harita tabanlı web uygulamaları için iyi bir alternatif çözümdür. Mapserver, google maps, offline mapping gibi alternatiflerin arasında ESRI tarafından geliştirilen ve öne çıkan bir üründür.

Örnek uygulamalar;

http://www.esri.com/software/arcgis/arcgisserver/live-user-sites.html

ArcGIS Server includes:

* ArcGIS Server for the Microsoft .NET Framework and the Java Platform
* ArcGIS Help System
* Esri Data & Maps
* Web Mapping APIs

Detaylar için http://www.esri.com/software/arcgis/arcgisserver/

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Posted on 14-04-2010
Filed Under (Geographic Information Systems) by admin

http://www.yougetsignal.com/tools/visual-tracert/

The visual tracert tool displays the path Internet packets traverse to reach a specified destination. The tool works by identifying the IP addresses of each hop along the way to the destination network address. The estimated geophysical location of each hop is identified using MaxMind’s GeoIP database. After all of the hops locations’ are identified, the path to the destination is plotted on a Google Map. More about this tool.

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http://www.cdc.gov/epiinfo/europe.htm

http://www.gfk-geomarketing.de/en/digital_maps/digital_map_samples/shape.html

(Güncellemeye açıktır. Önerdiğiniz adresleri aokany@gmail.com adresine yazabilirsiniz.)

cdc.gov adresinden aldığım Hollanda haritası eyaletlere göre ayrılmıştı. ArcCatalog ile projeksiyonunu GCS_WGS_1984 ‘e çevirerek aynı projeksiyon sistemi ile tanımlı dünya haritam üzerine sorunsuz oturdu:) ücretsiz vector çizim ve datalar, meraklılarının işine yarayacaktır.

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Posted on 17-04-2009
Filed Under (Geographic Information Systems) by admin

İncelemek isteyenler için adres: http://dev.live.com/virtualearth/sdk/

Web tabanlı GIS uygulamaları için kullanılabilir.

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