Welcome to the Harris Geospatial product documentation center. Here you will find reference guides, help documents, and product libraries.


Harris Geospatial / Docs Center / IDL Reference / I/O - EOS / EOS_GD_GETPIXELS

EOS_GD_GETPIXELS

EOS_GD_GETPIXELS

This function returns the pixel rows and columns for specified longitude/latitude pairs. This function converts longitude/latitude pairs into (0-based) pixel rows and columns. The origin is the upper left-hand corner of the grid. This routine is the pixel subsetting equivalent of EOS_GD_DEFBOXREGION.

Examples


This example converts two pairs of longitude/latitude values to rows and columns. The rows and columns of the two pairs will be returned in the rowArr and colArr arrays:

lonArr[0] = 134.2d
latArr[0] = -20.8d
lonArr[1] = 15.8d
latArr[1] = 84.6d
status = EOS_GD_GETPIXELS(gridID, 2, lonArr, latArr, rowArr, $
   colArr)

Syntax


Result = EOS_GD_GETPIXELS(gridID, nLonLat, lonVal, latVal, pixRow, pixCol)

Return Value


Returns SUCCEED(0) if successful and FAIL(–1) otherwise.

Arguments


gridID

Grid id (long) returned by EOS_GD_CREATE or EOS_GD_ATTACH.

nLonLat

Number of longitude/latitude pairs (long).

lonVal

Longitude values in degrees (double, 1D array).

latVal

Latitude values in degrees (double, 1D array).

pixRow

A named variable that will contain the pixel Rows (long array).

pixCol

A named variable that will contain the pixel Columns (long array).

Keywords


None

Version History


5.2

Introduced



© 2017 Exelis Visual Information Solutions, Inc. |  Legal
My Account    |    Buy    |    Contact Us