Filters








20,174 Hits in 3.4 sec

A Method for Automatically Extracting Road Layers from Raster Maps

Yao-Yi Chiang, Craig A. Knoblock
2009 2009 10th International Conference on Document Analysis and Recognition  
Our approach can be used on scanned and compressed maps that are otherwise difficult to process automatically and tedious to process manually.  ...  We can then use the identified road colors to extract road pixels from the map.  ...  For the automatic road intersection extraction process, in [4] , we employed a histogram analysis approach to extract the foreground pixels from the raster maps and utilized a text/graphics separation  ... 
doi:10.1109/icdar.2009.274 dblp:conf/icdar/ChiangK09 fatcat:iaseydv5frflref2vsql3pckeq

Page 369 of Abstracts of Photographic Science and Engineering Literature Vol. 8, Issue 11 [page]

1969 Abstracts of Photographic Science and Engineering Literature  
With increased use and improve- ment in automatic map compilation equipment, automat- ing the contouring process will relieve cartographers  ...  AERIAL PHO- TOGRAPHS IN TOPOGRAPHIC MAPPING, J.Halliday (U S Geological Survey, Washington, DC), Seminar Pro- ceedings, New Horizons in Color Aerial Photography, Amer Soc Photogramm & SPSE, Washington  ... 

NOAA Marine Geophysical Data and a GEBCO Grid for the Topographical Analysis of Japanese Archipelago by Means of GRASS GIS and GDAL Library

Polina Lemenkova
2020 Geomatics and Environmental Engineering  
The topographic spatial analysis is presented on Figures 7 and 8 .  ...  Applying color palette for the maps via 'r.colors' GRASS module.  ... 
doi:10.7494/geom.2020.14.4.25 fatcat:ihnvmqya7zbujfcer5kdyw524m

Toponym Recognition in Scanned Color Topographic Maps

J. Pouderoux, J.-C. Gonzato, A. Pereira, P. Guitton
2007 Proceedings of the International Conference on Document Analysis and Recognition  
Topographic paper maps are a common support for geographical information.  ...  In the field of document analysis of this kind of support, this paper proposes an automatic approach to extract and recognize toponyms.  ...  Acknowledgments Maps are reproduced with the gracious authorization of the IGN -Institut Géographique National (France). Samples we taken from the map TOP 25 #1940 O Série Bleue.  ... 
doi:10.1109/icdar.2007.4378766 dblp:conf/icdar/PouderouxGPG07 fatcat:chvtd73rm5edzkn5wchveds5j4

Fractal surfaces of synthetical DEM generated by GRASS GIS module r.surf.fractal from ETOPO1 raster grid

Polina Lemenkova
2020 Journal of Geodesy and Geoinformation  
Three tested dimensions of the fractal surfaces were automatically mapped and visualized.  ...  Information System (GRASS GIS) software.  ...  Methodology The methodology consists of the following steps: topographic mapping of the raster grids, automatic generating of the fractal surfaces of DEM; descriptive statistical analysis of the raster  ... 
doi:10.9733/jgg.2020r0006.e fatcat:33ydxuafvvhgzkuem3xokjp63u

Fractal surfaces of synthetical DEM generated by GRASS GIS module r.surf.fractal from ETOPO1 raster grid

Polina Lemenkova
2020 figshare.com  
Three tested dimensions of the fractal surfaces were automatically mapped and visualized.  ...  Information System (GRASS GIS) software.  ...  Methodology The methodology consists of the following steps: topographic mapping of the raster grids, automatic generating of the fractal surfaces of DEM; descriptive statistical analysis of the raster  ... 
doi:10.6084/m9.figshare.13047815.v1 fatcat:sguakhws2bfdhj7szun5scc3d4

Comparative study of the drainage basin morphometry extracted from topographic maps and SRTM DEMs: an example from Ghadir watershed, Eastern Desert, Egypt

2018 Delta Journal of Science  
DEM showed higher stream frequency (F) of 4.49 than those derived from topographic maps (4.38).  ...  Topographic sheets, Morphometric, SRTM DEM, Ghadir watershed, Eastern Desert, Egypt The drainage network of Wadi Ghadir watershed, southeastern Desert, Egypt was extracted from topographic maps (1:50.  ...  Ghadir basin: a) manually-traced from topographic maps and b) automatically-extracted from 30-m spatial resolution SRTM DEM.  ... 
doi:10.21608/djs.2018.138907 fatcat:emqid6wdljaflotza3cdscpsxq

NOAA Marine Geophysical Data and a GEBCO Grid for the Topographical Analysis of Japanese Archipelago by Means of GRASS GIS and GDAL Library

Polina Lemenkova
2020 figshare.com  
Methodology includes data processing (projecting and import), mapping and spatial analysis.  ...  The aspect map and reclassified map express gradient of the steepest descent.  ...  The topographic spatial analysis is presented on Figures 7 and 8 .  ... 
doi:10.6084/m9.figshare.13251881.v1 fatcat:rjqy527yvnbmlavgtk3rcse7ee

Classification of raster maps for automatic feature extraction

Yao-Yi Chiang, Craig A. Knoblock
2009 Proceedings of the 17th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems - GIS '09  
1 Motivation } Raster map is a bitmap image of a map } Raster maps are easily accessible } Contain information that is difficult to find elsewhere } Contain historical data USGS topographic map of  ...  Louis, MO Travel map of Tehran, Iran  ...  the ones in the other map Experiments 13 } Compare luminance-boundary histogram with } Color Histogram (CH): } Color Moments (CM): } Based on statistical analysis of CH, i.e., average,  ... 
doi:10.1145/1653771.1653793 dblp:conf/gis/ChiangK09 fatcat:64uodgdh7bhezfo4ftfqlyiij4

Scripting methods in topographic data processing on the example of Ethiopia

Polina Lemenkova
2021 Zenodo  
A variety of topographical zones is demonstrated on the presented maps.  ...  The study demonstrated application of the programming approaches in cartographic data visualization and mapping for geomorphometric analysis.  ...  Different elevation regions were highlighted by the color palettes for comparative analysis.  ... 
doi:10.5281/zenodo.4916883 fatcat:qfllaxu4pvgmno6c2nvdiiw4wa

Scripting methods in topographic data processing on the example of Ethiopia

Polina Lemenkova
2021 SINET: Ethiopian Journal of Science  
A variety of topographical zones is demonstrated on the presented maps.  ...  The study demonstrated application of the programming approaches in cartographic data visualization and mapping for geomorphometric analysis.  ...  The geomorphometric and topographic study is based on using data from DEM for geospatial analysis of the information regarding the quantitative geomorphological and topographic models expressed in maps  ... 
doi:10.4314/sinet.v44i1.9 fatcat:oez77sf6n5dxpa5o4abroec2vm

Identification of Contour Lines from Average-Quality Scanned Topographic Maps

Bin Xu, Jianping Chen, Meijuan Yao
2016 Mathematical Problems in Engineering  
First, it uses spatial fuzzyc-means algorithm (sFCM) to solve color aliasing and false color problems by taking into consideration both color and spatial information of topographic maps during color segmentation  ...  This paper presents a novel method for extracting contour lines from average-quality scanned topographic maps.  ...  Therefore, how to automatically identify contour lines on topographic maps is an urgent problem.  ... 
doi:10.1155/2016/3089690 fatcat:npss3uq53bgvvbvgqvhwjf3fze

Improved Characterization of Visual Evoked Potentials in Multiple Sclerosis by Topographic Analysis

Martin Hardmeier, Florian Hatz, Yvonne Naegelin, Darren Hight, Christian Schindler, Ludwig Kappos, Margitta Seeck, Christoph M. Michel, Peter Fuhr
2013 Brain Topography  
TVEP components were automatically defined on the basis of spatial similarity between the scalp potential fields (topographic maps) of single subjects' VEPs and reference maps generated from HC.  ...  In the present study, we explored whether the significance of the visual EP (VEP) can be improved with multichannel recordings (204 electrodes) and topographic analysis (tVEP).  ...  In subsequent analysis, these mean topographic maps will be used as reference maps and referred to as the ''N75/N145''-, ''P100''-, and ''P240''-maps (Fig. 1d) .  ... 
doi:10.1007/s10548-013-0318-6 pmid:24085573 pmcid:PMC3921459 fatcat:3izdbhgxkrdplovfjx5gde7464

Mapping Submarine Bathymetry and Geological Structure Using the Lineament Analysis Method

O-Il Kwon, Yong Baek, Jinhwan Kim
2014 The Journal of Engineering Geology  
A component of this research, an analysis of deep subsea geological structure, is currently underway.  ...  This study introduces an indirect approach for assessing the geological structure of the seafloor through a submarine bathymetry analysis.  ...  Acknowledgements Mapping Submarine Bathymetry and Geological Structure Using the Lineament Analysis Method  ... 
doi:10.9720/kseg.2014.4.455 fatcat:rasdlif3wfc6nelua6pxk4ezta

Dataset compilation by GRASS GIS for thematic mapping of Antarctica: Topographic surface, ice thickness, subglacial bed elevation and sediment thickness

Polina Lemenkova
2021 Zenodo  
Data show the distribution of the present-day glacier, geophysical fields and topographic landforms for analysis of processes and correlations between the geophysical and geological phenomena.  ...  This includes the machine learning algorithms of image classification enabling to distinguish between glacier and non-glacier surfaces through automatically partitioning data and analysis of various types  ...  Material and Methods The maps presented in this research were made using GRASS GIS (Geographic Resources Analysis Support System) originally developed by M.  ... 
doi:10.5281/zenodo.5274757 fatcat:tuz4idgscrb5bh5s3ipsrnjlxy
« Previous Showing results 1 — 15 out of 20,174 results