5-Lecture9

Geospatial Mashups 

Lecture 9

Web resources without a formal 

interface 

• Majority of the resources over web are web 

pages (HTMLs) that have no formal interface 

(i.e. API) 

– The data can be extracted, spatially referenced 

and integrated with other important applications


interface


interface 

• Web pages are a mixture of contents and 

styles 

• To be used in mashup the style needs to be 

removed from the content 

• This is done by web scraping

Web scraping 

Web scraping, also referred to as internet screen 

scraping or web data extraction, extracts 

information from unstructured web content, 

typically in HTML format and transforms it into 

structured data


interface 

• If the contents extracted by web scraping do 

not contain georeferences – the content 

needs further processing 

– Geocoding or place finder function 

• This process of parsing content, extracting 

geographic references, and resolving the 

geographic meaning is a form of geoparsing

Mashup Design and Implementation 

• Identify problems to solve and define the 

objectives to accomplish


• Search for web resources you need by using 

geoportals or web portals 

– Evaluate each resource by its quality and 

usefulness per the project requirements and by its 

programming interface and the workload required 

to mash it up


• Publish your contents and functions when 

they are not available over the web and when 

your are better for project at hand


• Organize the contents and functions into 

basemaps, operational layers and tools


• Implement your project through configuration 

or programming


• Test, enhance and deploy the application

5-Lecture9

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