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Qingyun Zhang (Rick)
Geog 583
Lab #3
2/16/2016
1. Compare the different design issues between the SANDAG
(http://www.sandag.org/index.asp?subclassid=100&fuseaction=home.subclasshome) Data Archive Center
and NYS GIS Clearinghouse http://gis.ny.gov/?nysgis= What's the differences between their web
design, data categories, download procedures, access limits, and potential users?
SANDAG serves the data which is cover the whole San Diego county, The web design is not
visibly as NYS GIS Clearinghouse. In order to search the data, you have to click the “Regional
GIS Data Warehouse” link then register an account to login and get data access. There are 31
categories total available and organized very well and all of them can be accessed. There is only
shapefile format available. It faces to anyone who interested to use the data for San Diego
associated project.
NYS GIS Clearinghouse serves the data which is cover the whole New York state. You may get
the data mostly by searching from the catalog, or you can get the frequent use data such as streets,
parcels, addresses, elevation, civil boundaries easily by clicking the “data” tab and find them in
the menu. The frequent use data can be downloaded in various form (either in shapefile or
geodatabase). However, the data is not rich as SANDAG. You don’t need register an account to
download the public. However, you might need to have high authorities to access the non-public
data. The contact information has been provided at the bottom of the data list. It more possibly
faces on higher authorities since the data is not easy access.
2. What are the differences between the GIS data archive centers and the GIS data
clearinghouse? What is NSDI?
GIS data archive provides the data that has been stored in their server, but the GIS
data clearinghouse provides the data that comes from multiple sources (other
organizations). NSDI indicates National Spatial Data Infrastructure which is the
infrastructure that share the data among government, non-profit, and academic
sectors.
3. Use on-line search engine (Google) to find a brief explanations of the followings
and one example for these technologies or applications.
SOAP and UDDI
SOAP: simple object access protocol which is a protocol specification for data
exchanging. It applies both HTML and XML. Example: The web server on .NET
UDDI: Universal description and discovery protocol which is a protocol that
based on XML and allows businesses publish themselves and find each other and
find how services interact each other over internet. Example: real estate websites,
whitepages.
Java Applets and Java Servlets
Java Applets runs a Java class on the client. It is a small application that is
written in Java bytecode but not limited in Java language. Example: intensive
visualization of the Mandelbrot set (looks very cool!)
Java Servlets is the application runs and host on server machine which can
extend the server's’ capabilities. Example: The wolfram alpha
CGI: Common Gateway Interface which is a technique that allows a client
integrate with web browser to ask data from the web server or server ask from the
web browser. It can make the dynamic web page. Example: web chatting on
customer service.
Active Server Page (ASP): It is a server side scripting environment that allow to
use for running dynamic web server application. Example: The Amazon and Ebay.