Amid a standoff with the Prometheans, Alyssa goes into withdrawal. Meanwhile, Randall, Hamish and Gabrielle track professor Foley.

The Knights weigh whether to join the Order. Alyssa suspects that her feelings for Jack might be blocking her magic. Kepler pulls rank on Vera.

The Knights try to prevent a strange affliction from spreading. Kepler schemes to strip Vera of her power, and Alyssa searches Vera's house. Jack tries to broker a deal between Vera and Salvador.

As chaos reigns, the Knights must convince Vera and Alyssa to work together to seal the eruption and save Lilith from the demon realm.

Call Netflix Netflix. Creators: Dennis Heaton. Watch all you want. Videos The Order. Season 2 Trailer: The Order. The Order: Season 1 Trailer 1.

Season 1 Recap: The Order. Episodes The Order. Season 1 Season 2. Release year: Hell Week: Part 1 51m. Hell Week: Part 2 47m. Introduction to Ethics: Part 1 49m.

Introduction to Ethics: Part 2 42m. Homecoming: Part 1 49m. Homecoming: Part 2 46m. Horton's and Strahler's rules form the basis of programming algorithms that interpret map data as queried by Geographic Information Systems.

The classic use of stream order is in general hydrological cartography. Stream order systems are also important for the systematic mapping of a river system, enabling the clear labelling and ordering of streams.

The Strahler and Shreve methods are particularly valuable for the modelling and morphometric analysis of river systems, because they define each section of a river.

That allows the network to be separated at each gauge or outflow into upstream and downstream regimes, and for these points to be classified. These systems are also used as a basis for modelling the water budget using storage models or time-related, precipitation-outflow models and the like.

In the GIS-based earth sciences these two models are used because they show the graphical extent of a river object.

Research activity following Strahler's report has focused on solving some challenges when converting two-dimensional maps into three-dimensional vector models.

One challenge has been to convert rasterized pixel images of streams into vector format. Another problem has been that map scaling adjustments when using GIS may alter the stream classification by a factor or one or two orders.

Depending on the scale of the GIS map, some fine detail of the tree structure of a river system can be lost. Research efforts by private industry, universities and federal government agencies such as the EPA and USGS have combined resources and aligned focus to study these and other challenges.

The principal intent is to standardize software and programming rules so GIS data is consistently reliable at any map scale.

Both federal agencies, as well as leading private industry software companies have adopted Horton's and Strahler's stream order vector principles as the basis for coding logic rules built into the standardized National Map software.

From Wikipedia, the free encyclopedia. See also: Hack's law. Main article: Strahler stream order.

Categories : Hydrology Limnology. Hidden categories: CS1 German-language sources de. Namespaces Article Talk. Going up in size and strength, streams that are classified as fourth- through sixth-order are medium streams, while anything larger up to 12th-order is considered a river.

For example, to compare the relative size of these different streams, the Ohio River in the United States is an eighth-order stream while the Mississippi River is a 10th-order stream.

Unlike the smaller order streams, these medium and large rivers are usually less steep and flow more slowly. They do however tend to have larger volumes of runoff and debris as it collects in them from the smaller waterways flowing into them.

If, however, two streams of different order join neither increases in order. For example, if a second-order stream joins a third-order stream, the second-order stream simply ends by flowing its contents into the third-order stream, which then maintains its place in the hierarchy.

Stream order also helps people like biogeographers and biologists in determining what types of life might be present in the waterway.

This is the idea behind the River Continuum Concept, a model used to determine the number and types of organisms present in a stream of a given size.

More types of plants, for example, can live in sediment-filled, slower flowing rivers like the lower Mississippi than can live in a fast-flowing tributary of the same river.

More recently, stream order has also been used in geographic information systems GIS to map river networks.