Results 211 to 220 of about 66,706 (243)

Comparative assessment of the measures of thematic classification accuracy

Remote Sensing of Environment, 2007
Accuracy assessment of classified imagery is an important task in remote sensing. Various measures have been developed to describe and compare the accuracy of maps and the performance of different classifiers, but the extent to which these measures are consistent with each other is largely unknown.
Canran Liu, Lalit Kumar
exaly   +2 more sources

Thematic accuracy assessment of geographic object-based image classification

International Journal of Geographical Information Science, 2011
Geographic object-based image analysis is an image-processing method where groups of spatially adjacent pixels are classified as if they were behaving as a whole unit. This approach raises concerns about the way subsequent validation studies must be conducted. Indeed, classical point-based sampling strategies based on the spatial distribution of sample
Julien Radoux, Patrick Bogaert, Dominique Fasbender, Pierre Defourny   +3 more
exaly   +2 more sources

Method for assessing the thematic and positional accuracy of seagrass mapping

Marine Geodesy, 1997
Maps showing the density and distribution of seagrasses in Shark Bay, Western Australia, were prepared through interpretation of vertical aerial photographs. The hard‐copy maps were digitized and geo‐referenced by registration against Landsat TM images using geographic information systems (GIS). Since habitat mapping of marine environments can generate
E. M. Bruce, I. G. Eliot, D. J. Milton
exaly   +2 more sources

Basic probability sampling designs for thematic map accuracy assessment

International Journal of Remote Sensing, 1999
Choosing a sampling design for assessing thematic map accuracy requires the strength of a sampling design to be matched to the objectives and resources available for the accuracy assessment. The criteria to consider when planning the sampling design are that the sample should: (1) satisfy probability sampling protocol; (2) be simple to implement and ...
Stephen Stehman
exaly   +2 more sources

Design and Analysis for Thematic Map Accuracy Assessment

Remote Sensing of Environment, 1998
Stephen Stehman, Raymond Czaplewski
exaly   +2 more sources

Mapping Spatial Thematic Accuracy with Fuzzy Sets

Photogrammetric Engineering & Remote Sensing, 2005
Common thematic map accuracy measures (e.g., error matrix and kappa coefficient) are inadequate for analyzing the spatial variation of thematic map accuracy. This paper presents a method of mapping spatial accuracy of thematic land cover maps using fuzzy sets.
Liem T. Tran, James Wickham, S. Taylor Jarnagin, C. Gregory Knight   +3 more
openaire   +1 more source

ACCURACY OF THEMATIC MAPS / IMPLICATIONS OF CHOROPLETH SYMBOLIZATION

Cartographica, 1985
Accuracy of thematic maps is identified as having two components: planimetric accuracy and data representation accuracy. The first is of only minor concern for thematic maps. Data representation accuracy, however, is at least as significant to map effectiveness as are the perceptual and cognitive aspects of map reading that have been given so much ...
openaire   +1 more source

Fuzzy set theory and thematic maps: accuracy assessment and area estimation

International Journal of Geographical Information Science, 2000
Traditionally, the classes in thematic maps have been treated as crisp sets, using classical set theory. In this formulation, map classes are assumed to be mutually exclusive and exhaustive. This approach limits the ability of thematic maps to represent the continuum of variation found in most landscapes.
Curtis E. Woodcock, Sucharita Gopal
openaire   +2 more sources

Spatially Variable Thematic Accuracy: Beyond the Confusion Matrix

2001
An essential aspect of the increasing sophistication of ecological models is the use of spatially explicit inputs and outputs. Thus, the challenge of documenting the uncertainty of model parameters must expand to include the distribution of error across the surface of maps, satellite images, and other ecological data that are keyed by geographic ...
Kenneth C. McGwire, Peter Fisher
openaire   +1 more source

Thematic accuracy of MRLC land cover for the eastern United States

Remote Sensing of Environment, 2001
Abstract One objective of the MultiResolution Land Characteristics (MRLC) consortium is to map general land-cover categories for the conterminous United States using Landsat Thematic Mapper (TM) data. Land-cover mapping and classification accuracy assessment are complete for the eastern United States.
Limin Yang, Stephen V Stehman, Jonathan H Smith, James D Wickham   +3 more
openaire   +1 more source