How Matlab Helps
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This document discusses how MATLAB can be used for geospatial data analysis and visualization. It describes how MATLAB supports various vector and raster data formats and functions for reading, displaying, and writing geospatial data. Methods for manipulating and visualizing vector data like points, lines, and polygons are covered as well as functions for reading and writing raster data. The document also outlines techniques for visualizing the distribution of geospatial data using 1D and 2D plots.
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Landline: (044) - 43012642 / Mobile: (0)9952649690
Pondicherry Office: JP INFOTECH, #45, Kamaraj Salai, Thattanchavady, Puducherry - 9
Landmark: Opp. to Thattanchavady Industrial Estate & Next to VVP Nagar Arch.
Landline: (0413) - 4300535 / Mobile: (0)8608600246 / (0)9952649690.
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Landmark: Opp. to Thattanchavady Industrial Estate & Next to VVP Nagar Arch.
Landline: (0413) - 4300535 / Mobile: (0)8608600246 / (0)9952649690.
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How Matlab Helps
- 1. HOW MATLAB HELPS Zhang Xiaohu
- 2. WHY MATLAB Fast prototyping Toolbox IDE Warning: Fortran, LAPACK Efficiency -- Vectorization Alternative Option Octave http://www.gnu.org/software/octave/ M_Map
- 3. DATA FORMATS SUPPORTED Vector Data ESRI Shapfile KML … Raster Data GeoTIFF Arc ASCII Grid … Relevant Data Image file formats NetCDF, HDF*, and Multband files (BIP,BIL,BSQ) … WMS
- 4. OUTLINE Matlab and Geospatial Data Vector Data Manipulation Raster Data Manipulation Distribution Figures 1-D Distribution 2-D Distribution
- 5. VECTOR DATA MANIPULATION Read Structures Display Write Point, Polyline, Polygon
- 6. READ VECTOR DATA S = shaperead(filename, Name,Value, ...) Field Name Data Type Description Comments Geometry String One of the following shape types: 'Point', 'MultiPoint', 'Line', or 'Polygon'. For a 'PolyLine', the value of the Geometry field is simply 'Line'. BoundingBox 2-by-2 numerical array Specifies the minimum and maximum feature coordinate values in each dimension in the following form: Omitted for shape type 'Point'. X, Y, Lon, or Lat 1-by-N array of classdouble Coordinate vector. Attribute String or scalar number Attribute name, type, and value. Optional. There are usually multiple attributes.
- 7. READ VECTOR DATA Example Point Polyline Polygon Geometry 'Polygon' BoundingBox [2x2 double] Lon [1x5785 double] Lat [1x5785 double] AREA 54.447 PERIMETER 68.489 BOU2_4M_ 2 BOU2_4M_ID 23 ADCODE93 230000 ADCODE99 230000 NAME '黑龙江省' Geometry 'Point' Lon 116.3809 Lat 39.9236 AREA 0 PERIMETER 0 RES1_4M_ 1 RES1_4M_ID 61 GBCODE 31010 NAME '北京' ADCODE93 110100 ADCODE99 110100 ADCLASS 1 PINYIN 'Beijing' Geometry 'Line' BoundingBox [2x2 double] Lon [1x11 double] Lat [1x11 double] FNODE_ 18 TNODE_ 18 LPOLY_ 6 RPOLY_ 4 LENGTH 0.075 HYD1_4M_ 1 HYD1_4M_ID 1359 GBCODE 23010 NAME '克鲁伦河' LEVEL_RIVE 3 EVEL_LAKE 1
- 8. DISPLAY VECTOR DATA worldmap [construct map axes] mapshow [without projection] geoshow [with projection] scaleruler northarrow
- 9. WRITE VECTOR DATA Write Point data
- 10. WRITE VECTOR DATA Write Line data
- 11. WRITE VECTOR DATA Write Polygon data
- 12. READ RASTER DATA [A, R] = geotiffread(filename) [Z,R] = arcgridread(filename)
- 13. WRITE RASTER DATA geotiffwrite(filename,A,R) Image Processing Toolbox Computer Vision System Toolbox
- 14. OUTLINE Matlab and Geospatial Data Vector Data Manipulation Raster Data Manipulation Distribution Figures 1-D Distribution 2-D Distribution
- 17. THANKS