Top Document: Satellite Imagery FAQ - 2/5 Previous Document: Weather Satellites Next Document: Synthetic Aperture Radar (SAR) See reader questions & answers on this topic! - Help others by sharing your knowledge Earth Observation Satellites _See also the list below, containing pointers to detailed information and online imagery._ Earth Observation imagery takes a number of forms, of which the most traditional are optical and near-infrared radiation, from about 0.4 (blue) to 2.0 (IR) micrometers. Examples include Landsat, Spot and NOAA. These generally use tracking instrunents, the basic principles of which are briefly described in Part 2 of this FAQ _(someone point me to a proper intro on the net - SURELY there must be one)!_. Colour After basic processing, imagery from these satellites may appear as photographs. With certain visual imagery - eg SPOT - it is even possible to display images in more-or-less their natural colour. In practice, images for display are generally manipulated to appear visually pleasing and to show interesting detail, and appear in _false colour_. Visible and non-visible (IR) bands may be freely mixed in false colour images. There are no firm rules about this, but by convention clouds are shown as white, and vegetation red or green, depending on the context. Resolution Resolution is determined primarily by instrument design, and generally involves various compromises: 1. High spatial resolution implies imaging a small area. For an image of 1000 pixels square, at 20m resolution the area viewed is 20x20Km, but at 1Km resolution this increases to 1000x1000Km (actually rather more, due to the variation in viewing angle over a large area). The latter is therefore intrinsically suited to large-scale studies. 2. High spatial resolution also implies a high sampling frequency, which may limit the sensitivity of the sensor. Types of Imagery Apart from visual and near-infrared, other bands of the spectrum commonly used include thermal infrared (heat) and microwave (radar). Each of these has its own applications. 3-dimensional Imagery We see the world in three dimensions by virtue of having two eyes, viewing the world at slightly different angles. It is possible to emulate this and produce 3-dimensional (stereo) satellite imagery, by superimposing images of the same ground area, viewed from different angles (and at different times). A limited number of satellites have this capability. User Contributions:Comment about this article, ask questions, or add new information about this topic:Top Document: Satellite Imagery FAQ - 2/5 Previous Document: Weather Satellites Next Document: Synthetic Aperture Radar (SAR) Part1 - Part2 - Part3 - Part4 - Part5 - Single Page [ Usenet FAQs | Web FAQs | Documents | RFC Index ] Send corrections/additions to the FAQ Maintainer: satfaq@pobox.com
Last Update March 27 2014 @ 02:12 PM
|
Russians who want to impress their social media followers can now rent huge bouquets of flowers for just long enough to snap an Instagram worthy photo, It's revealed.
Pop up services are advertising on social networks in planning for International Women's Day on 8 March, A public holiday in Russia when women are in the past feted with flowers and other gifts. They're offering 10 minutes with an enormous bouquet sufficient time to perfect the best angle and pose before the courier takes it back, The TJournal news blog reports. One account offers women a fleeting visit from 101 roses for 700 roubles ($12; 10).
Posting selfies with huge bouquets seemingly sent by a boyfriend or secret admirer has been a trend among Russian Instagram and VKontakte social network users for quite a while.
The 360 TV website contacted the master of one flower rental Instagram account, [url=https://charmdatescamreviews.wordpress.com/tag/hot-russian-women/]russian sexy girls[/url] Who insisted his service was real and had received many asks. He says the 10 minutes can be drawn out a little, But not consistently. "the most important thing to avoid is: 'I'm obtaining put some make up on and tidy up' and all that', according to him.
Another account that 360 TV contacted ended up being a joke set up to mock the new trend, And there was plenty of ridicule from Russians placing comments online. "the secret of a mysterious bunch of flowers from a stranger has been EXPOSED, Writes an individual on Twitter. "might be quintessence of modern values, Says an Instagram surfer, Who suggests similar service aimed at men: "A Rolex download, Two iPhones shared and a selfie taken in a Moscow office with a panoramic view.