Functions that Read and Write Geospatial Data

The following table lists Mapping Toolbox™ functions that read geospatial data products and file formats and write geospatial data files. Note that the geoshow and mapshow functions and the mapview GUI can read and display both vector and raster geodata files in several formats. Click function names to see their details in the Mapping Toolbox reference documentation. The Type of Coordinates column describes whether the function returns or writes data in geographic ("geo") or projected ("map") coordinates, or as geolocated data grids (which, for the functions listed, all contain geographic coordinates). Some functions can return either geographic or map coordinates, depending on what the file being read contains; these functions do not signify what type of coordinates they return (in the case of shaperead, however, you can specify whether the structure it returns should have X and Y or Lon and Lat fields).

Function	Description	Type of Data	Type of Coordinates
`avhrrgoode`	Read data products derived from the Advanced Very High Resolution Radiometer (AVHRR) and stored in the Goode Homosoline projection: Global Land Cover Classification (GLCC) or Normalized Difference Vegetation Index (NDVI)	raster	geolocated
`avhrrlambert`	Read AVHRR GLCC and NDVI data products stored in the Lambert Conformal Conic projection	raster	geolocated
`dcwdata`	Read selected data from the Digital Chart of the World (DCW)	vector	geo
`dcwgaz`	Search for entries in the DCW gazette	vector	geo
`dcwread`	Read a DCW file	vector	geo
`dcwrhead`	Read a DCW file header	properties	geo
`demdataui`	GUI for interactively selecting data from various Digital Elevation Models (DEMs)	raster	geo
`dteds`	List DTED data grid file names for a specified latitude-longitude quadrangle	file names	geo
`egm96geoid`	Read 15-minute gridded geoid heights from the EGM96 geoid model	raster	geo
`fipsname`	Read Federal Image Processing Standards (FIPS) names for Topographically Integrated Geographic Encoding and Referencing (TIGER) thinned boundary files	FIPS names and identifiers	geo
`georasterinfo`	Get information about data files in formats such as Esri Binary Grid, Esri GridFloat, DTED, GeoTIFF, and GPX	raster	map geo
`geotiffinfo`	Get information about GeoTIFF files	properties	map geo
`geotiffwrite`	Write GeoTIFF file	raster	map geo
`getworldfilename`	Derive a world file name from an image file name	file name	geo map
`globedems`	List GLOBE data file names for a specified latitude-longitude quadrangle	file names	geo
`gshhs`	Read Global Self-Consistent Hierarchical High-Resolution Geography (GSHHG) data	vector	geo
`gtopo30s`	List GTOPO30 data file names for a specified latitude-longitude quadrangle	file names	geo
`kmlwrite`	Write vector coordinates and attributes to a file in KML format	vector points and attributes	geo
`readfk5`	Read data from the Fifth Fundamental Catalog of Stars	vector	astro
`readgeoraster`	Read data in formats such as Esri Binary Grid, Esri GridFloat, DTED, GeoTIFF, and GPX	raster	geo map
`sdtsinfo`	Get information about SDTS data set	properties	geo
`shapeinfo`	Get information about the geometry and attributes of geographic features stored in a shapefile (a set of ".shp", ".shx" and ".dbf" files)	properties	geo map
`shaperead`	Read geographic feature coordinates and associated attributes from a shapefile	vector	geo map
`shapewrite`	Write geospatial data and associated attributes in shapefile format	vector	geo map
`usgsdems`	List USGS digital elevation model (DEM) file names covering a specified latitude-longitude quadrangle	file names	map
`vmap0data`	Extract selected data from the Vector Map Level 0 (VMAP0) CD-ROMs	vector	geo
`vmap0read`	Read a VMAP0 file	vector	geo
`vmap0rhead`	Read VMAP0 file headers	properties	geo
`vmap0ui`	Activate GUI for interactively selecting VMAP0 data	vector	geo
`worldfileread`	Read a world file and return a referencing matrix	georeferencing information	geo
`worldfilewrite`	Export a referencing matrix into an equivalent world file	georeferencing information	geo

The MATLAB^® environment provides many general file reading and writing functions (for example, imread, imwrite, urlread, and urlwrite) which you can use to access geospatial data you want to use with Mapping Toolbox software. For example, you can read a TIFF image with imread and its accompanying world file with worldfileread to import the image and construct a referencing matrix to georeference it. See the Mapping Toolbox examples Creating a Half-Resolution Georeferenced Image and Georeferencing an Image to an Orthotile Base Layer for examples of how you can do this.

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Functions that Read and Write Geospatial Data

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