correlation
[statistics] An association between data or variables that change or occur together.
Correlation function
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the cross-correlation function: [R.sub.k,i]
and the message data: [d.sub.i] ...
Correlations among populations describe the similarity of environmental patterns experienced by each population.
correlation Process of establishing contemporaneity of rocks or events in one area with rocks or events in another area.
Correlations between magnitudes of adjacent coefficients in the same block;
Correlations between magnitudes of the same coefficient in adjacent blocks;
Correlations between magnitudes of the same coefficient/block in different channels; ...
The correlation appears good enough to be reasonably convincing.
TM data have been processed to extract more information on the alteration present.
The correlation between astronomical (geometric) albedo, absolute magnitude and diameter is:[13] ,
where A is the astronomical albedo, D is the diameter in kilometres, and H is the absolute magnitude.
[edit] Other types of albedo ...
Spatial autocorrelation can be analyzed using correlograms, covariance functions and variograms (=semivariograms).
References: ...
Spatial autocorrelation - The degree of relationship that exists between two or more spatial data variables (e.g. amount of organic matter in soil, gradient, suitability for agriculture). When one variable changes in one direction (e.g.
There is a strong correlation between rainfall in the Sahel and intense hurricane activity in the Atlantic.
External links and references ...
4.1.2 Spatial Autocorrelation
4.1.3 Benchmarking Interpolation Approaches
4.1.4 Assessing Interpolation Results ...
Can be calculated by taking the square if the correlation coefficient.
212 a geostatistical technique for interpolation that uses information about the spatial autocorrelation in the vicinity of each point to provide 'optimal' interpolation (in the sense of greater use of the information provided by the spatial ...
map, base Map on which information may be placed for purposes of comparison or geographical correlation. The term "base map" was at one time applied to a class of maps now known as outline maps.
` or `Take this data and do a correlation operation on it!` In a simple sense, your word processor is a client when you click on `Save` and the word processor instructs the operating system (acting as a server) to save your file to disk.
The output is an N x N symmetric covariance (correlation) matrix, where N is the number of raster map layers specified on the command line. For example, r.covar map=layer.1,layer.2,layer.3 would produce a 3x3 matrix (values are example only): 1.
Generally, independent-baseline processors assume that there is no correlation between independent vectors. Trivial baselines may be included in the adjustment to make up for such a deficient statistical model.
Examples would include the correlation of disease or vitality with residences over specific types of bedrock or health problems associated with exposure to specific mineral materials.
Metamorphism: ...
horizontal parallels visually preserve latitude relations, thus easing correlation of phenomena which mostly depend on distance from Equator, e.g., daylight periods, climate, winds and greenhouse warming ...
Geographic phenomena: Cartographers and geographers use symbols on maps to represent various geographic phenomena involving location, distance, volume, movement, function, process, correlation, etc.
With it, you can explore the distribution of the data, look for global and local outliers, look for global trends, examine spatial autocorrelation, and understand the correlation between multiple datasets.
Most GIS packages allow for statistical operations such as regression and correlation; measurement capability for distance, direction, area, and perimeter computation; and geometric operations such as rotation, translation, and scaling.
A distance measurement based on the correlation of a satellite transmitted code and the local receiver's reference code, that has not been corrected for errors in synchronization between the transmitter's clock and the receiver's clock.
- Q - ...
If there is a positive correlation between the distance of plot trees from the plot center and difficulty in finding the plot center, the darker plots will be more difficult to find. You might alter your field work schedule accordingly.
The subfigure on top left side shows the excellent correlation between the training samples and the corresponding network outputs. The correlation with the test data (top right subfigure) is not so good.
Base Map - A map on which information can be placed for geographical correlation. Also can be used as a "base" upon which to build other information.
"TransCAD is a GIS software package that contains extensive geostatistical functions including spatial correlations, model estimation, and model evaluation.
values often occur in runs across several cells
this is a form of spatial autocorrelation - tendency for nearby things to be more similar than distant things
data entered as pairs, first run length, then value ...
Ecogeographic rule: one of the statements from 19th century naturalists recognizing correlations between the morphology of warm blooded animals (mammals and birds) and climatic and/or latitudinal gradients.
Create and view professional-looking HGL and Flow Correlation reports in addition to being able to produce detailed calibration reports.
A map designed specifically to be used as a template, onto which further information is placed for the purpose of comparison or spatial correlation.
Programme International de Correlation Geologique
PICS
Pacific Institute of Cartographers Society ...
A look at mapped census data may reveal that block-groups with lower than average rents, tend also to have a larger proportion of new units. This correlation at an aggregate level should certainly not be interpreted as evidence that new housing units ...
During the final compilation of the survey, correlations with map units of adjacent counties are checked and adjusted. Once the maps and survey reports are reviewed and edited, the county soil survey is ready for publication.
Basic level of map data on which other information is placed for purposes of comparison or geographical correlation. (Also called Base Layer.)
Base Layer
See Base Data.
A GIS structure providing a framework for data manipulation and display of map data for applications such as:
(a) location verification,
(b) location correlation,
(c) locational relationships,
(d) district coding,
(e) route analysis, ...
Maps: This term is used, throughout the 'Mapping the Lakes' site, to refer to those GIS cartographies which represent more abstract writerly responses to landscape and environment. These exploratory maps test whether there is any correlation ...
Code Division Multiple Access (CDMA)
A method whereby many radios use the same frequency, but each one has a unique code. GPS uses CDMA techniques with codes for their unique cross-correlation properties.
photos of most areas are available for free download from NASA's NIMA website. These are orthorectified, meaning that they will overlay correctly on your ArcMap layer. A non-orthorectified photo is difficult to use, as it has no spatial correlation.
I hope I shall not be considered immodest if this current of localized small plants running counter to the main stream of a positive correlation of size of plant and localization is called, for short, the Florence Effect." [P.
Within archaeology there is an emphasis on cell-based manipulation as an extension of the earlier work, for example auto-correlation (Kvamme 1993), statistics and simulation (Kvamme 1996), ...
one shapefile that contains lightning strikes and other weather data, one that contains ignition locations, one that shows human habitation, and one that contains vegetation coverage. By overlaying these files, you can quickly see the correlations ...
The values can be derived from map contours, by profiling a stereo model using a photogrammetric instrument or by processing digital stereoscopic scenes with image correlation algorithms. Other sources are satellite and aircraft altimetric sensors.
Other spectral-spatial models exploit a measure of image texture or the spatial autocorrelation function as an additional feature in the classification process (Shih and Schowengerdt 1983, Pickup and Chewings 1988).
do not have a direct correlation to parcels. In fact there seems to be an inverse relationship between parcel density and number of physical features.
 See also: Relation, Information, Analysis, Model, Area
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