See Also: expression
[mathematics] A number, variable, function, or combination of these, with operators or parentheses, or both, that can be evaluated to produce a single number.
Easy Expression Blend Configuration
Using MapIt you can easily configure an interactive map in Expression Blend.
[edit] Expressions in three dimensions
The form of the gradient depends on the coordinate system used. In Cartesian coordinates, the above expression expands to
which is often written using the standard vectors : ...
The SearchExpression Method is used to create a Recordset from an ANSI SQL statement. The Recordset is the key object for interacting with the information in a MapLayer (ESRI,1996c).
Expressions
List of slogans
List of advertising slogans
List of state mottos
List of corporate slogans ...
The expression thus derived from a fundamental polygon of a surface turns out to be the sole relation in a presentation of the fundamental group of the surface with the polygon edge labels as generators.
The expression "scattered data interpolation" was is used to distinguish applicable methods from otherwise structured-dependent techniques. Often, the objective is to obtain a contoured representation of the data.
The expression means this line-by-line, in English:
If elevation is greater than 500 and less than 1700, then
set output value to (elevation * 100), or else
set output value to 0 ...
This expression can easily be reused by copying it and pasting it into as many Map Calculator dialogs as necessary, one for each source DEM. Simply change the theme name appearing between square brackets [].
Boolean expression - An expression that contains logical (i.e. true or false) expressions and Boolean operators (i.e. NOT, AND and OR), e.g. HEIGHT > 50 AND DIAMETER < 3.
...
Then the expression:
would produce a result with category values 0, 1.4, 2.4, 3.5, 5.8, 7.2, 8.8 and 9.4.
From this expression we observe that the tracking error induced by C/A code interference will depend on different parameters:
the relative code delay: [DELTA][[tau].sub.k,i] = [[tau].sub.i] - [[tau].sub.k]
the power factor: [a.sub.i] [a.sub.k] ...
A two digit expression that represents the minimum and maximum number of times one occurrence of an entity, a geometric representation or ancillary data can be involved in a relation.
2. Study the expression and modes of the origin of landforms (geomorphology)
3. Determine the structural arrangements of disturbed strata (folds and faults)
4. Evaluate dynamic changes from natural events (e.g., floods; volcanic eruptions) ...
Ever hear the expression "Before you can get where you're going, you have to know where you are"?
Protean places Expression used by A.Saxenian (1994) to describe the capacity of certain regional industrial systems to adapt and change. [Cohen & Fields (1998)] ...
This grid-based expression for mapped data with X,Y indicating placement (Where) and Z indicating characteristic (What) is often referred to as 2.5-D; "official" 3-D data requires that all three axes are geographic coordinates.
[This philosophy is opposed to the classical theory that measurement is the numerical expression of one quantity relative to another; quantities were seen as inherent.] resampling p.
One of several regional or continental expressions of a given biome. Function: refers to action, how something works.
Models can include a combination of logical expressions, mathematical equations, and criteria that are applied or the purpose of simulating a process, predicting an outcome, or characterizing a phenomenon.
logical connector One of the reserved words AND, OR and XOR used to build complex logical expressions in a query.
In addition, these different kinds of data are simply treated as different datatypes within the Oracle Database and, as a result, it is very easy to combine these different types of data within a single SQL query expression or an application.
A query usually appears in the form of a statement or logical expression. It can contain a field, an operator, and a value.
An important factor in ensuring that a user can sensibly compare records you create with those provided by others is the use of standardised terminologies and modes of expression.
That is the estimates can be biased due to the inappropriate choise of the trend expression and the regular model for variogram approximation.
Since we would like this model to be flexible, we will allow the user to specify this expression within the model parameters. Right-click the Select tool and choose "Make Variable > From Parameter > Expression". You will see a new element appear.
In mathematical terms, DOP is a scalar quantity used in an expression of a ratio of the positioning accuracy. It is the ratio of the standard deviation of one coordinate to the measurement accuracy.
We've all heard the expression, "Garbage In, Garbage Out." Without the ability to meet the proper accuracy standards established early in a GIS conversion project, the resulting GIS may be useless based upon its lack of accuracy.
Warning against conflating science and its positivistic expression, Johnston (1986:6) proposes a more generous view of science as "the pursuit of systematic and formulated knowledge, and as such [it] is not confined to any particular epistemology.
A design rule is an expression for calculating a value for a single attribute. Attribute values are calculated as-needed, and the rule calculation order is determined automatically.
Fire intensity levels (FILs) provide "an expression of fireline intensity, based on typical and/ or calculated flame length of a fire behavior condition.
Regression equations The multiple regression equations relate ellipsoidal latitude and longitude co-ordinates of continental size datums to those of the WGS84 datum and involve polynomial expressions in the two ellipsoidal co-ordinates which ...
The first is that the cell size determines the resolution of the data and the cell has both ground and map expression. Second, the grid has an extent, that is rectangular since the grid is made of rows and columns.
In other words, one is defined in relation to the meter by a decimal expression, the other by a fraction. Fortunately, the difference is very small, amounting to less than a few meters over an area as large as a U.S. state.
Other geographic operators commonly available in GIS packages are intersection, point in polygon, area in area, and other expressions of interrelationships between geographic entities that can be used to select, reject, merge, ...
Note that we could accomplish the same thing by entering a logical expression into the map calculator such as:
[sled_slopes] = 1 & [public] = 1
The result will be a grid having a value of 1 (true) for each cell that meets the logical criteria.
The Boolean search feature did not seem to work unless the entire expression was enclosed in parentheses.
Table capabilities include sums, averages, and counts across rows and columns, and standard arithmetic expressions based on cell values. Table calculations are automatically updated as your designs and documentation progress.
Watch the parentheses that are included in the equation, ArcView is very particular about proper use of parentheses to separate expressions in the equation.
All strings need to be surrounded by quotation marks("), ex. Brazil = "Brazil".
A contour interval between intermediate contour lines to increase the topographic expression of an area, usually in areas of extremely low relief (also known as supplementary contour) e.g. 10 m contour interval and 5 m auxiliary contour interval ...
arc -- a locus of points that forms a curve that is defined by a mathematical expression.
attribute -- a defined characteristic of an entity type (e.g. composition).
Representative Fraction The expression of map scale as a mathematical ratio. Reptile Group of terrestrial vertebrate animals that includes turtles, tortoises, snakes, lizards, crocodiles, and alligators.
This term is most often used in the expression, "great circle route", which is the shortest path between two points on the Earth. This information is most useful in air navigation, because aircraft usually travel along great circle routes.
crystal The multi-sided form of a mineral, bounded by planar growth surfaces, that is the outward expression of the ordered arrangement of atoms within it.
4 (T values represent the tons of topsoil likely to be eroded per 0.4 ha/year). Attribute query functions should support the use of complex Boolean expressions on the attributes of one or more data layers.
SQL
STRUCTURED QUERY LANGUAGE A standard language used with relational database products which enables the user to build complex logical expressions identifying the data to be recalled and manipulated.
You should see thousands of points, all with a value (GRID_CODE) of 0. If the points aren't all 0, open the attribute table, select "Calculate Values" by right clicking at the top of the column, and enter an expression like this.
The method is often described as map algebra (figure 7.6). The raster GIS provides the ability to perform map layers mathematically.
The map algebraic function uses mathematical expressions to create new raster layers by comparing them.
A more visual and less mathematical expression of scale is a linear graph or bar that is divided into units of actual distance on the portion of the earth represented by the map.
 See also: Information, Map, Model, Relation, Image
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