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MATLAB Programming

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7 Working with Scientific Data Formats<br />

Each row represents a dimension in the data set and each column represents<br />

these subsetting parameters:<br />

• Start — Specifies the position on the dimension to begin reading. The<br />

default value is 1, which starts reading at the first element of each<br />

dimension. The values specified must not exceed the size of the relevant<br />

dimension of the data set.<br />

• Increment — Specifies the interval between the values to read. The<br />

default value is 1, which reads every element of the data set.<br />

• Length — Specifies how much data to read along each dimension. The<br />

default value is the length of the dimension, which causes all the data to<br />

be read.<br />

Geographic Box. You can import a subset of an HDF-EOS Grid data set<br />

by specifying the rectangular area of the grid that you are interested in. To<br />

define this rectangular area, you must specify two points, using longitude and<br />

latitude in decimal degrees. These points are two corners of the rectangular<br />

area. Typically, Corner 1 is the upper-left corner of the box, and Corner 2<br />

is the lower-right corner of the box.<br />

7-44

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