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Top Answer
Answered Apr 15, 2011 · 1 votes
It would be a good idea to let us know if you're talking about the full desktop Google Earth (ie. with the COM API) or the thin client web based app.
That being said -- neither versions support touch events natively. Both applications are extremely "mouse heavy" and do virtually all interaction via the mouse. You basically have to map all the touch events to mouse events and go from there. This isn't exactly easy, and requires a lot of low level WinAPI programming -- so it might be easier to get some overlay that does the mouse translation for you.
I personally haven't used the wrapper that Kevin posted, but it looked interesting -- so that might work for you.
EDIT: Kevin's suggestion uses TUIO, which is a pretty popular way of going from touch --> mouse events. In my experience this doesn't do a very good job for Google Earth though, which relies on your typical "mouse down, mouse move, mouse up" patterns ---- this can be done in TUIO, but the actual gestures to get mouse down/move/up actions are clunky.
-- Dan
1/5
Top Answer
Answered Sep 19, 2014 · 3 votes
After Successfully logged in this url gets all old cookiees which stored in browser in request header and verify with server and update it if any changes.-generally this cookie always changed during each request - 1. __utma, 2. __utmb, 3. __utmc, 4. __utmz.
to see live demo of changing cookie use firecookie addon in firefox.
2/5
Top Answer
Answered Jan 05, 2021 · 0 votes
It's Roboto, and yes, you can use it (it's available under Apache License 2.0).
You can find it on Google Fonts as well as the license information.
Finding fonts for yourself
On webpages, it's quite easy to find which font is in use. Just right-click the element you want to know, Inspect Element, and check the cascading stylesheet. You'll probably see a font-family property and that's it.
3/5
Top Answer
Answered Mar 18, 2015 · 601 votes
Bigtable
A Distributed Storage System for Structured Data
Bigtable is a distributed storage system (built by Google) for managing structured data that is designed to scale to a very large size: petabytes of data across thousands of commodity servers.
Many projects at Google store data in Bigtable, including web indexing, Google Earth, and Google Finance. These applications place very different demands on Bigtable, both in terms of data size (from URLs to web pages to satellite imagery) and latency requirements (from backend bulk processing to real-time data serving).
Despite these varied demands, Bigtable has successfully provided a flexible, high-performance solution for all of these Google products.
Some features
- fast and extremely large-scale DBMS
- a sparse, distributed multi-dimensional sorted map, sharing characteristics of both row-oriented and column-oriented databases.
- designed to scale into the petabyte range
- it works across hundreds or thousands of machines
- it is easy to add more machines to the system and automatically start taking advantage of those resources without any reconfiguration
- each table has multiple dimensions (one of which is a field for time, allowing versioning)
- tables are optimized for GFS (Google File System) by being split into multiple tablets - segments of the table as split along a row chosen such that the tablet will be ~200 megabytes in size.
Architecture
BigTable is not a relational database. It does not support joins nor does it support rich SQL-like queries. Each table is a multidimensional sparse map. Tables consist of rows and columns, and each cell has a time stamp. There can be multiple versions of a cell with different time stamps. The time stamp allows for operations such as "select 'n' versions of this Web page" or "delete cells that are older than a specific date/time."
In order to manage the huge tables, Bigtable splits tables at row boundaries and saves them as tablets. A tablet is around 200 MB, and each machine saves about 100 tablets. This setup allows tablets from a single table to be spread among many servers. It also allows for fine-grained load balancing. If one table is receiving many queries, it can shed other tablets or move the busy table to another machine that is not so busy. Also, if a machine goes down, a tablet may be spread across many other servers so that the performance impact on any given machine is minimal.
Tables are stored as immutable SSTables and a tail of logs (one log per machine). When a machine runs out of system memory, it compresses some tablets using Google proprietary compression techniques (BMDiff and Zippy). Minor compactions involve only a few tablets, while major compactions involve the whole table system and recover hard-disk space.
The locations of Bigtable tablets are stored in cells. The lookup of any particular tablet is handled by a three-tiered system. The clients get a point to a META0 table, of which there is only one. The META0 table keeps track of many META1 tablets that contain the locations of the tablets being looked up. Both META0 and META1 make heavy use of pre-fetching and caching to minimize bottlenecks in the system.
Implementation
BigTable is built on Google File System (GFS), which is used as a backing store for log and data files. GFS provides reliable storage for SSTables, a Google-proprietary file format used to persist table data.
Another service that BigTable makes heavy use of is Chubby, a highly-available, reliable distributed lock service. Chubby allows clients to take a lock, possibly associating it with some metadata, which it can renew by sending keep alive messages back to Chubby. The locks are stored in a filesystem-like hierarchical naming structure.
There are three primary server types of interest in the Bigtable system:
- Master servers: assign tablets to tablet servers, keeps track of where tablets are located and redistributes tasks as needed.
- Tablet servers: handle read/write requests for tablets and split tablets when they exceed size limits (usually 100MB - 200MB). If a tablet server fails, then a 100 tablet servers each pickup 1 new tablet and the system recovers.
- Lock servers: instances of the Chubby distributed lock service. Lots of actions within BigTable require acquisition of locks including opening tablets for writing, ensuring that there is no more than one active Master at a time, and access control checking.
Example from Google's research paper:
A slice of an example table that stores Web pages. The row name is a reversed URL. The contents column family contains the page contents, and the anchor column family contains the text of any anchors that reference the page. CNN's home page is referenced by both the Sports Illustrated and the MY-look home pages, so the row contains columns named anchor:cnnsi.com and anchor:my.look.ca. Each anchor cell has one version; the contents column has three versions, at timestamps t3, t5, and t6.
API
Typical operations to BigTable are creation and deletion of tables and column families, writing data and deleting columns from a row. BigTable provides this functions to application developers in an API. Transactions are supported at the row level, but not across several row keys.
Here is the link to the PDF of the research paper.
And here you can find a video showing Google's Jeff Dean in a lecture at the University of Washington, discussing the Bigtable content storage system used in Google's backend.
Other Answers
Answered Feb 19, 2012 · 53 votes
It's something they've built themselves - it's called Bigtable.
http://en.wikipedia.org/wiki/BigTable
There is a paper by Google on the database:
http://research.google.com/archive/bigtable.html
Other Answers
Answered Jan 24, 2014 · 36 votes
Spanner is Google's globally distributed relational database management system (RDBMS), the successor to BigTable. Google claims it is not a pure relational system because each table must have a primary key.
Here is the link of the paper.
Spanner is Google's scalable, multi-version, globally-distributed, and synchronously-replicated database. It is the first system to distribute data at global scale and support externally-consistent distributed transactions. This paper describes how Spanner is structured, its feature set, the rationale underlying various design decisions, and a novel time API that exposes clock uncertainty. This API and its implementation are critical to supporting external consistency and a variety of powerful features: non-blocking reads in the past, lock-free read-only transactions, and atomic schema changes, across all of Spanner.
Another database invented by Google is Megastore. Here is the abstract:
Megastore is a storage system developed to meet the requirements of today's interactive online services. Megastore blends the scalability of a NoSQL datastore with the convenience of a traditional RDBMS in a novel way, and provides both strong consistency guarantees and high availability. We provide fully serializable ACID semantics within fine-grained partitions of data. This partitioning allows us to synchronously replicate each write across a wide area network with reasonable latency and support seamless failover between datacenters. This paper describes Megastore's semantics and replication algorithm. It also describes our experience supporting a wide range of Google production services built with Megastore.
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Top Answer
Answered Oct 18, 2018 · 3 votes
The google.maps.event.addDomListener adds a DOM event listener, in this case to the window object, for the 'load' event, and specifies a function to run.
from the documentation:
addDomListener(instance:Object, eventName:string, handler:function(?), capture?:boolean)Return Value: MapsEventListenerCross browser event handler registration. This listener is removed by calling removeListener(handle) for the handle that is returned by this function.
The initialize in google.maps.event.addDomListener(window, 'load', initialize); is a function pointer, you can't pass arguments with that. To pass in arguments, wrap it in an anonymous function (that doesn't take arguments):
google.maps.event.addDomListener(window, 'load', function () { initialize(latitude, longitude);});
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stackoverflow.com › questions › 41380916html - the use of `%3F` in URL - Stack Overflow
stackoverflow.com › questions › 41380916Dec 29, 2016 · While moving a website - that I did not build - I have run into the use of %3F. %3F is the percent-encoded version of ?. It seems to be used like this a lot: <ahref="example%3Flang=1.html">Example</a> when linking to a file named example_lang=1.html. So, I replaced %3F with _, and all works again. I am missing something here. The old website ...
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